#rf antenna to hdmi

[rfantennaindia]

GSM 15dBi #YagiAntenna With RG58 Cable (L-3Mtr) + N (M) St. Connector

SKU: ET-GS15Y5-2L3-NMS

Specs:-

*Product Antenna

*Type-Outdoor Antenna

*Frequency-800/900/1800/1900MHz

*Radiation-Directional

*Mounting Pole Mount

*Connector N Male

Know More At - https://eteily.com/

#yagiantenna#eteily#technologies#eteilyindia#gsm#rf#antenna#telecom#telecommunication#cable#outdoor

[pc-98s]

Hey I have one of those little tvs too howd u do the broadcast setup

I've been trying to research how it works but a lot of the technical details confuse me

required equipment: RF modulator with correct format for your TV (PAL for european, NTSC for north american/japanese), HDMI to AV downscaler (unless you're using a device with AV output for the stream source, or your RF modulator has HDMI input), TV antenna (i just used a little pair of rabbit ears from target), and, optional but recommended: signal amplifier. and of course a tv with an antenna.

connect your TV antenna and optional amplifier to the RF modulator's output - normally you would use a coaxial cable to connect this directly to the TV's antenna input, but in this case we're being silly and sending the signal over the air instead, which it is not designed for.

connect your source device (i'm using a roku) to the HDMI downscaler if necessary. then, connect the downscaler (or the source device if not using a downscaler) to the RF modulator's input.

plug in any devices that need external power, and then tune your TV to the channel the RF modulator is set to - on NTSC modulators, this is usually by default channel 3 or 4. the one i'm using defaults to whatever it was set to last, which was NTSC 14.

enjoy your low fidelity! using this setup WITH the amplifier the broadcast range is about 3 feet, but it drops off significantly over one foot away. if you used a real transmitter the results would be better. but we're not doing that.

[techtired]

The Samsung 85-Inch TV QN90D 4K QLED Review: A New Standard for Large-Screen TVs

Strong picture quality and excellent gaming performance make Samsung's QN90D top of the current 4K QLED TV pile. Still, it's not the best choice on Samsung's roster. After all, Samsung also produces 8K LED TVs like the QN900D and 4K OLED TVs akin to the S95D, an Editors' Choice winner. Available in considerably more screen sizes ranging from 43 to 98 inches, priced at $2,699 for the 65-inch version we tested, the QN90D costs a bit less than the same-size S95D ($3,399.99) and half as much as the QN900D ($4,999). Though we advise the S95D for its higher picture quality and more elegant style, this is an attractive high-end TV if you want to splurge on the best. Samsung 85-Inch QN90D 4K QLED TV Specs Panel Type LED Screen Size 85 inches Resolution 3,840 by 2,160 Video Inputs HDMI, RF, USB HDR HDR-10 HDMI Ports 4 Streaming Services Yes Screen Brightness 1253 nits Contrast Ratio Infinite Refresh Rate 120 Hz Input Lag (Game Mode) 2.9 ms AMD FreeSync FreeSync Premium Pro Nvidia G-Sync None Review Of Samsung QN90D Qled TV Review Originally published in June 2023, the Samsung Q80C QLED TV falls in the upper-mid-range of Samsung's QLED line above the Samsung Q70C and Q75C but below the Samsung Q85C and Samsung QN90C. Since its release, prices have dropped dramatically; the 65-inch unit we tested today goes for roughly $1,199 at most stores, including Samsung's own. Launching somewhat below its predecessor in the Q80B, the Q80C now stamps itself as quite the deal among QLED options. Thanks in significant part to its price-to-performance ratio, it is among the top 65-inch TVs and one of the most excellent Samsung TVs. Samsung TV Models Current Pricing - 50-inch Samsung Q80C TV (QN50Q80C) – $999 ($799 on clearance). 55-inch Samsung Q80C TV (QN55Q80C) — $1,199 ($999 on sale) $1,499 ($1,199 on sale) 65-inch Samsung Q80C TV (QN65Q80C) 75-inch Samsung Q80C QLED TV (QN75Q80C) – $2,199 ($1,399 on sale). 85-inch Samsung Q80C QLED TV (QN85Q80C) — $3,299 ($1,799 on sale) 98-inch Samsung Q80C QLED TV (QN98Q80C) – $7,999 ($4,999 on sale). From those searching for a smaller (and less expensive) 50-inch model to those who genuinely want larger TVs in the gigantic 98-inch configuration, the Q80C comes in a range of sizes that makes it perfect for nearly any consumer, as seen here. Should you be unclear about which ideal choice, you can always refer to our guide on which size TV you should purchase to acquire the model most suited to your requirements. Design: Easy To Use And Understand With a bezel-free screen bound by a thin dark grey metal band around the edge, the QN90D looks elegant and essential. Held up by a very slender neck on the rear, it rests on a broad hexagonal black metal base and creates the sense of a floating screen. Though the remote can also wirelessly connect to the TV via Bluetooth, the screen's lower right corner has a little rectangular bump holding the sensor for the remote. Unlike last year's flagship QN95C (and the more recent 8K QN900D and S95D OLED), the QN90D features a regular sequence of ports on the right side of the TV instead of a separate OneConnect box that links to the screen via a single wire. Apart from the specified models, practically all TVs have this configuration; it is not less convenient than utilizing a OneConnect box unless you wish the elegance of only one cable flowing from the panel. Four HDMI ports (one eARC), two USB connections, one Ethernet port, an optical audio output, an antenna/cable connector, and a 3.5mm EX-Link port for integrating the QN90D into a home theatre system face right on the rear of the TV. Operating System: Tizen OS Like all of Samsung's TVs, the Tizen smart TV OS drives the QN90D. Though its design is annoying, it has many functionalities. It supports all extensive streaming services—Amazon Prime Video, Apple TV, Crunchyroll, Disney+, Max, Netflix, Twitch, and YouTube. The platform supports Apple AirPlay for streaming video from your iPad, iPhone, or Mac and Miracast/WiDi for linking your Windows PC to an external display. Thanks to the far-field microphone array of the TV, Amazon Alexa is also built-in, and you can use the voice assistant hands-free. Trying to set several variables and switch between sources outside the smart TV's apps causes frustration. Standard visual settings are hidden beneath a few more layers of menus than most other TVs, and even switching to an HDMI device requires some menu diving until the interface decides to place the item on the recent sources bar. The remote does not include an input button. Performance: Excellent color accuracy and contrast The 4K Samsung QN90D TV runs a 120Hz refresh rate. It supports high dynamic range (HDR) content in hybrid log gamma (HLG), HDR10, and HDR10+; while practically every other TV maker supports Dolby Vision, Samsung keeps ignoring it. For audio, though, it backs Dolby Atmos. It lacks ATSC 3.0 for over-the-air 1080p and 4K but features an ATSC 1.0 tuner for live broadcasts. We evaluate TVs with Calman software from Portrait Displays, a Klein K-10A colorimeter, and a Murideo SIX-G signal generator. The Q90D shows a peak brightness of 247 nits with a full-screen white field and 236 nits with an 18% white field using an SDR source in Movie mode with all settings on default. Peak brightness leaps to 618 nits with a full-screen white field and 1,253 nits with an 18% white field on an HDR source. This is a bit less bright than the QN95C's levels (805 nits full-screen, 1,420 nits 18%), which itself is a little darker than the previous year's QN90B (1,700 nits 18%), and far dimmer than the Hisense U8K (2, 114 nits 18%). Still, it's pretty brilliant, far above the 1,000-nit threshold at which most HDR footage is mastered. Samsung Q80c LED TV: Audio The Q80C's sound is highly moving even though it provides just 40W of power built on a 2.2-channel system. The Q80C requires no additional oomph when other TVs fall flat and call for adding one of the top soundbars.  It also has Dolby Atmos capabilities, even though I skipped Dolby Vision, which provides extra bass and clarity as needed. Since most TVs fall into this category, sound never was a big problem on the Q80C, which is a beautiful delight. Samsung Q80c Qled TV: Applications And Interface The Q80C operates on the Tizen Smart TV interface, the same as every other Samsung TV. It resembles LG's in-house webOS system in that it features a top rail devoted to your tastes in apps and inputs and a sizable main ad feed at the top of the main page.  Tizen gets the job done, unlike the cherished Google TV system. It is mainly designed to fulfil most users' demands and includes plenty of customizing to simplify content curation; specific complex photo settings are buried deep in the menus and have particular pain points. The Bottom Line When local dimming is set to "High," the Samsung QN90D is a terrific TV with a unique local dimming function that provides outstanding contrast and incredible black uniformity. Still, the 2023 Samsung QN85C QLED is precisely as impressive, albeit that model has an ADS panel instead of the VA of the QN85D, offering the earlier model a far wider viewing angle at the expense of reduced contrast. As incredible as this TV is, ultimately, models from companies like Hisense and TCL outpace it since both the Hisense U8K and the TCL QM8 provide more excellent overall performance at a lower cost. Read the full article

[foxingpeculiar]

I got a VCR for Christmas that just got shipped to my house and I’m trying to set it up.

It has 2 outputs: RF coax and a mono-composite (yellow and white, but no red). My TV is newish and has no composite inputs, so I tried an RF cable. The TV has an RF input, but it thinks it’s an antenna and does not recognize the VCR. It just switches to live TV, with no channel that has the VCR input registering.

So I tried running the composite through a composite-HDMI converter I got for the PS2. Only get left audio. Sounds weird.

Which means to get this thing to work, I had to buy a coax-HDMI converter. Except the only ones I could find were BNC not RF. Which means I also had to get a converter for that.

But I also got a composite switch, so I think, once those arrive on Tuesday, I can strip the whole setup down, get some cable management ties, and actually be able to use everything.

But seriously, the future is stupid. It should not take this many fucking wires to make this work.

[sugaronyourtongu3]

how does your CRT tv work? do you hook it up to a DVD player to get the movies you’d like to see? Can you somehow use an HDMI port? hook it up to the internet? i’d love to do something similar

Hey!

I got a vhs DVD player combo, which connects to the tv with an AV cord. Some CRT’s only have a tv antenna (rf) port so you can get AV to RF modulators to get video working with a player.

I think you can also get an AV to HDMI modulator so you can use HDMI but it’s better to get a DVD player that’s roughly from the same time period as your tv so the cords can connect.

I’ve never connected internet to my tv and don’t intend to but I have seen many people use Netflix and smart apps on their crt so I’m sure YouTube has plenty of tutorials on that.

Over all, get yourself a good crt first. You should be able to find most for under $100 AUD.

Hope I made sense and happy CRTing, it’s a good time and keeps the nostalgia happy.

[trendyprojectors]

Pyle 15.6 Inch 1080p LED RV Television Review – PROS & CONS Slim Flat Screen TV

15.6 Inch 1080p LED RV Television - Slim Flat Screen Monitor FHD Small TV w/HDMI, RCA, Multimedia Disk/DVD Combo, 12/24 Volt Car Adapter, Wall Mount, Works w/Mac PC, Includes Remote Control,Black

HD 1080p SUPPORT: Immerse yourself in stunning high-definition visuals with the LED RV TV's 1920x1080p widescreen display. Experience vibrant colors and lifelike images on the expansive 15.6" screen. Enjoy wide viewing angles of 178° vertically and horizontally for a captivating visual experience

WORKS WITH PC: Stream audio and effortlessly view your image collections on the HD LED TV. Whether you're using a Mac or PC, this TV is compatible and delivers exceptional performance. Choose from various multi-viewing display modes like 16:9, 4:3, zoom, and cinema for a personalized viewing experience

MOUNTS ON WALL: Optimize your space and achieve a sleek, clutter-free design with the LED TV monitor. Easily mount it on the wall using the removable base stand. With universal VESA mounting compatibility (75mm x 75mm), you can transform any room into a home theater

INPUT/OUTPUT INTERFACE: Immerse yourself in rich audio with the built-in full range stereo speakers. Connect your devices seamlessly with the HDMI, CVBS, RCA (L/R) audio, VGA/PC, PC audio, RF (antenna) input interfaces. The TV also offers COAX audio, headphones, and line out (analog) audio output interfaces

[olabanjitech]

With the transition from analog to digital TV signals, many viewers found themselves in need of a converter box to continue watching their favorite shows. However, as technology has evolved, there are now alternative methods to access digital TV without the need for a converter box. In this blog post, we will explore various ways to enjoy digital TV without investing in additional equipment, making it a hassle-free and cost-effective solution for everyone. So, let's dive in and explore these options, Read also: Best Modded Controller Xbox One - Every Gamers Choice Check for Built-in Digital Tuners: Before seeking alternative methods, it's essential to determine if your TV already has a built-in digital tuner. Most modern televisions manufactured after 2007 come equipped with digital tuners, also known as ATSC (Advanced Television Systems Committee) tuners. To check if your TV has this feature, consult your TV's user manual or look for labels such as "DTV," "HDTV," or "ATSC" on the TV itself. Connect an Antenna: One of the simplest ways to access digital TV without a converter box is by connecting an antenna directly to your television. Over-the-air (OTA) broadcasts are still widely available and provide high-quality, uncompressed signals for local channels. Here's how to do it: a) Purchase an Antenna:  Look for a digital antenna that is suitable for your location and offers good reception. Indoor and outdoor antennas are both available, with outdoor antennas generally providing better signal strength. b) Connect the Antenna:  Plug one end of the coaxial cable into the antenna's "ANT" or "RF IN" port and the other end into the TV's coaxial input. Then, perform a channel scan on your TV to locate available channels. Refer to your TV's user manual for instructions on how to perform a channel scan. c) Adjust and Optimize the Antenna:  Experiment with different antenna placements and orientations to achieve the best reception. Factors like distance from broadcast towers, physical obstructions, and interference can affect signal quality. Streaming Services and Apps: In recent years, streaming services have become immensely popular for accessing digital content. Many of these services offer live TV channels as part of their packages, eliminating the need for a traditional cable subscription or converter box. Some popular streaming options include: a) Live TV Streaming Services:  Platforms like YouTube TV, Hulu + Live TV, Sling TV, and AT&T TV offer live TV packages that include local channels and a wide range of other popular networks. These services require a stable internet connection and can be accessed on smart TVs, streaming devices, or even smartphones and tablets. b) Network Apps and Websites:  Many television networks now have their own apps and websites that provide live streaming of their channels and on-demand content. These apps often require a cable or satellite TV login, but some offer limited free access as well. Digital-to-Analog Converter Boxes: If you own an older TV without a built-in digital tuner, another option is to purchase a digital-to-analog converter box. These boxes convert digital signals into analog signals compatible with older TVs, allowing you to receive digital broadcasts. While this option requires additional investment, it is still a more affordable alternative to cable subscriptions. Make sure to choose a converter box that matches your TV's connectivity options (such as HDMI or composite). Internet-based TV Services: If you have a reliable internet connection, you can also explore internet-based TV services that offer a wide range of digital channels. These services are accessed through streaming devices, gaming consoles, smart TVs, or even computers and smartphones. Some popular options include: a) IPTV (Internet Protocol Television):  IPTV services deliver TV channels over the internet, providing an alternative to traditional cable or satellite TV. These services often require a subscription and offer a vast selection of channels from around the world.

b) Over-the-Top (OTT) Platforms:  OTT platforms like Netflix, Amazon Prime Video, and Disney+ offer a wide variety of on-demand TV shows and movies. While they do not provide live TV channels, they are an excellent complement to other digital TV options. Conclusion: In today's digital era, accessing digital TV without a converter box is easier than ever. By leveraging built-in digital tuners, connecting an antenna, exploring streaming services and apps, investing in a digital-to-analog converter box (if needed), or opting for internet-based TV services, you can enjoy a wide range of digital content without breaking the bank. Remember to consider factors such as location, signal strength, and internet connectivity when choosing the most suitable option for your needs. Embrace the flexibility and convenience of digital TV without the need for a converter box and elevate your viewing experience today

[anantradingpvtltd]

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[foone]

It's because TVs used to only support modulated video: this is what they pick up with the antenna. You could later connect it to cable, but fundamentally the signal was the same: all the channels are on the same wire, just modulated to different carrier frequencies.

Each channel has a video signals and a completely separate audio signal on a different frequency.

The TV has a tuning circuit that matches the frequencies for a given channel, letting it extract the video data and the audio data.

So later TVs started including the RCA plugs for composite video: this is the signal that the TV displays, after tuning into it. This is the red/white/yellow plugs.

But prior to that, TVs only had the coax connectors for antennas/cable:

(and even earlier they had 300 ohm twin lead, which is a whole separate thing I won't go into)

But yeah the problem was that the TV can only show "TV". This is a single signals where the video and audio has been modulated onto channel(s).

Since that's all TVs had for input, VCRs and early game consoles had to meet them there: they had to generate modulated NTSC signals for the TV to display.

So they did that (often with an external module, for FCC certification reasons) by modulating the video onto channel 3 (or 4 or 2). So you just set your TV to that channel to watch it.

As far as your TV knows, there's only one channel in your area, and it's 3.

The reasons they let you pick multiple channels (usually only 2, but which 2 changed from device to device: either 2/3 or 3/4) was because there were some TV channels already using channels 2-4. If you lived next to WBBM-TV in Chicago, it's already broadcasting a pretty strong channel 2 signal, so you can't really use that one. Every cable is a little bit of an antenna, so you'd get shitty video quality because of channel 2 interfering with it (and the RF video was never that great in quality to begin with).

The reason you could only do those 2 channels (and not just, like, channel 13 or 69) is because of the complexities of designing the modulating circuit for the VCR/Console. It's easy to hardwire the circuit to do one frequency plus a switch to make a slight change to a nearby one, but much harder (and more expensive) to make it do arbitrary frequencies.

But yeah, the "tune to channel X" thing went away once TVs started adding RCA plugs for composite, then component/vga/dvi/hdmi/dp/etc. Early on, the "tune to channel 3" RF modulator was the most compatible option we had on hand. You often saw consoles supporting more than one option: like an NES can do both RF and Composite. Composite will look better, but it's not compatible with all TVs. RF will work basically everywhere, but looks crappier.

Sorry if this is too long. I am verbose.

can anyone (in only a few sentences) tell me what the deal was with putting older TVs on channel 3 to do anything or should I look this up instead.

i kno I can just search for answers but the replies people give with personal touches and added trivia are more fun 2 read. and also sometimes i have like fundamentally incorrect ideas and gotta get steered the right way by a human person lol

[setuphdtv]

10 Actions to a Standard HDTV Configuration

If you are a first-time proprietor of an HDTV, upgrading your old HDTV or changing that old tube TELEVISION below are ten suggestions to a basic HDTV setup. These must help you obtain one of the most out of your brand-new HDTV and also give you the best possible image top quality.

 This Just how To post is contacted give guidance for attaching your HDTV to a cable/satellite box as well as a Blu-ray DVD gamer. Future short articles will discuss exactly how to link Surround Sound Systems, Noise Bars, Wi-Fi (for Wi-Fi allowed HDTVs & Blu-ray players) and Game Consoles.

Take the TV out the box

Yes this is noticeable, but a word of caution. Suppliers like to pack the components needed to construct your TELEVISION in very odd areas. They make use of tape to hold the components safely and also sometimes the parts are light and also don't make any sound as you unpack your TV. 

Thoroughly seek elements on each item of Styrofoam in package Ultimately, don't throw away package up until the TV is entirely set up and working, directly in an instance.

 I am constructing the parts in package.

There are lots of various pedestals for flat screen Televisions. Each manufacturer has its very own foundation, some suppliers also have numerous kinds of foundations depending upon the TELEVISION design. Here are web links to a few of the most popular sorts of Samsung, LG, Panasonic and Sony instructions. The best thing to do is adhere to the guidelines that featured your TV to put together the stand. If you're wall surface placing it after that keep the components away for the future.

 The back panel

 There are some adapters back there but just a couple of are made use of in a standard High Definition arrangement.

 RF Jack Used to connect an Antenna or cord service where a box is not needed

HDMI port. This is the preferred input for an HDTV. If you want the most effective picture you can have this is the one to utilise.

RCA Composite Video Clip. This is the traditional adapter. Utilised to attach old VCRs or DVDs. (red, white & yellow).

RCA Element Video Clip. These are the old analog HD connectors (red, environment-friendly, blue).

VGA Port. If you wish to attach your laptop or desktop computer this is where you connect it using a VGA wire.

S-Video.An old cord kind. Not the earliest, yet close. I used to be preferred on VHS video cameras as well as gamers among others.

PC Audio In. Link your laptop or desktop computer below using a 1/8"( 3.5 mm) patch cord. Audio from your computer system will originate from the TV.

This one is not numbered yet it remains in the lower left. Coaxial adapter.It is used for linking a powered subwoofer.

Above is a complete listing of all the jacks displayed in the picture. Listed below are the studs you will certainly need to complete your links.

 # 1 RF Jack. This is utilised if you can receive HDTV over the air and don't use a set-top box (cable/satellite).

# 2 HDMI port. This is the favoured input for HDTV. If you desire the best image this is the one to use.

# 4 Element Video.Still made use of by some pc gaming systems.

Gather the materials as well as devices.

Cord and Satellite provider bring wires with them when linking a new solution. Nevertheless, most only utilise the older Component Video adapters as well as bill extra if you want the much better HDMI cable. If you had your box installed before you had HDTV after that you possibly have an old RF coax cord( # 1) or composite video clip wire 3.

If you didn't get cables when you purchased your equipment or, as mentioned above, you're upgrading from a non-HD TELEVISION currently is the moment to head out and also shop for your cables. In, HDMI Cable, Why do I require one? I cover some basic knowledge you'll need when purchasing your HDMI cords.

 If you are wall surface mounting the TV then you'll require to choose which installing style you'll want. In The 3 Main Types Of TV Brackets there is an excellent introduction of the distinction between the braces.

 Video Resource makes all the difference.

If you have not already done so, you ought to get a new HD set-top box from your satellite or wire service provider. Without one you'll never actually get an excellent picture. It might cost a bit much more every month, however the distinction in the image will certainly be worth the money.

 I am placing every little thing in place.

If you are wall placing, then the wall mount must already remain in the area. I would certainly recommend including a wall surface rack to hold the cable/satellite box as well as the DVD right below the TV.

 If you are setting up the TELEVISION on a stand after that it should be installed at eye degree for the best watching angle. Position your box and DVD where you want however be aware of the size of your cable televisions. I such as utilising a 3-foot cable to keep the added cable at a minimum, however this requires every little thing to be close and leaves no area to serpent the cord around shelves.

 The Fundamental HDTV Setup.

At this point you need to have all the necessary parts to arrangement and also program your new TELEVISION. TV's with more than one HDMI have them phoned number. This will be necessary later when setting your TELEVISION.

 Attach the first HDMI wire to HDMI1 if your TELEVISION has more than one connector. Number 2.

Place the Cable/Satellite box where you want it and also connect the HDMI cable television to it. Typically there is just one HDMI adapter in the back of the box.

 If you're installing a Blu-Ray DVD gamer follow the same procedure.

 Link the 2nd HDMI cable to HDMI2 if your TV has more than one connector. It's the reduced port in Number 2.

Put the Blu-Ray DVD player where you desire it and also link the HDMI cable to it. Again, typically there is just one HDMI adapter in the rear of the package.

 If your TELEVISION doesn't have a second HDMI after that you can make use of the component video clip wires. DVD gamers are still being made with the older component adapters (# 4) (in the meantime anyhow). These are examples of the rear panel of the devices. Your actual boardmy vary but the standard jacks will exist.

 Examining and Configuring the TELEVISION.

To verify every little thing is attached, begin by turning on the satellite/cable box. Using the TELEVISION's remote, push the "Resource" or "Input" button till you see HDMI1. Offering package is working, you must see as well as hear regular TV show programs.

The following power on the DVD/Blu-Ray, don't bother with placing in a disc the menu will certainly be all we need to test it. Once again press the "Resource" or "Input" on the satellite/cable box up until you see HDMI2. You need to see something different on the display currently. If it's black after that attempt placing a disc to make sure the player is functioning. As long as you can see something like a food selection or a movie you've hooked things up correctly.

 Configuring the Universal Remote.

The last point you need to do is configure the satellite/cable box's global remote to collaborate with your TELEVISION and DVD player. This component differs a fair bit due to the many various companies as well as the several models of boxes they provide. Right here is a list of universal remote programs directions and also codes.

 Last ideas.

That about does it for now.Time to kick back and also appreciate your brand-new HDTV Entertainment System. In the future you may wish to explore boosting the noise. There are numerous choices from full 7.1 border sound systems to the primary noise bar.

 Lately installed a brand-new HDTV? Share your experienced right here for the advantage of other new HDTV proprietors.

[soukacatv]

A message signal usually spreads over a range of frequencies, called the signal base width. That is why message signals are also called base band signals, representing the band of frequencies of the original signal. Suppose we wish to to transmit an electrical signal in the audio frequency (AF) range (20 Hz to 20 kHz) over a long distance. we cannot do it directly thus there is necessity of modulation.

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Necessity of modulation?

Size of antenna or aerial

An antenna or aerial is needed, both for transmission and reception. Each antenna should have a size comparable to the wavelength of the signal, (at least ), so that time variation of the signal is properly sensed by the antenna.

For an audio frequency signal of frequency f = 15 kHz, the wavelength, .

The length of the antenna = \dfrac{\lambda}{4} = \dfrac{20000}{4} = 5000 [/latex] meter. To set up an antenna of vertical height 5000 meter is practically impossible to construct and operate.

If transmission frequency were raised to 1 MHz, then .

The length of antenna would be , i.e.,

As high powers are needed for good transmission, therefore, for given antenna length, wavelength  should be small or frequency f should be high.

Thus, this factor also points out to the need of using high frequency transmission.

Mixing up of signals from different transmitters.

When my people are talking at the same time, we just cannot make out who is talking what? Similarly, when many transmitters are transmitting baseband information signals simultaneously, they get mixed up and there is on way to distinguish between them. The possible solution is, communication at high frequencies and allotting a band of frequencies to each transmitter so that there is no mixing. This is what is being done for different radio and T.V. broadcast stations.

All the three reasons explained above suggested that there is a need for transmission at high frequencies. This is achieved by a process, called modulation.

What is Modulation?

Basic to the field of communications is the concept of modulation. Modulation is the process of putting information onto a high-frequency carrier for transmission. In essence, then, the transmission takes place at the high frequency (the carrier) which has been modified to “carry” the lower-frequency information. The low-frequency information is often called the intelligence signal or, simply, the intelligence. It follows that once this information is received the intelligence must be removed from the high-frequency carrier – a process known as demodulation. At this point you may be thinking, why bother to go through this modulation/demodulation process? Why not just transmit the information directly? The problem is that the frequency of the human voice ranges from about 20 to 300 Hz. If everyone transmitted those frequencies directly as radio waves, interference would cause them all to be ineffective. Another limitation of equal importance is the virtual impossibility of transmitting such low frequencies since the required antennas for efficient propagation would be miles in length. Thus, there is necessity of modulation.

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The solution is modulation, which allow propagation of the low-frequency intelligence with a high-frequency carrier. The high-frequency carriers are chosen such that only one transmitter in an area operates at the same frequency to minimize interference, and that frequency is high enough so that efficient antenna sizes are manageable. There are three basic methods of putting low-frequency information onto a higher frequency.

So we can define modulation as ‘Modulation is the process by which some characteristics (amplitude, frequency or phase angle) of a voltage (usually sinusoidal voltage), carrier voltage is varied in accordance with the instantaneous value of some other voltage called the modulating voltage.’

Let the carrier voltage be sinusoidal and its instantaneous value vc at time t be given by,

 …….(1)

Where.

Vc is the amplitude of the carrier voltage,

 is the angular frequency of carrier in radians/second?

 is the phase angle

Then,

Where, fc is the frequency of the carrier in Hz.

Types of Modulation

During the process of modulation, any one of the three parameters viz Vc;  and  of the carrier wave is varied in accordance with information or message signal, which is the modulation base band audio frequency signal m(t). This would result in three types of modulation.

Amplitude Modulation: In amplitude modulation, the amplitude of the carrier is varied according to the instantaneous value of the modulating voltage.

Frequency Modulation: In frequency modulation, frequency of the carrier is varied according to the instantaneous value of the modulating voltage.

Phase Modulating: In phase modulating, phase angle of the carrier is varied according to the instantaneous value of the modulating voltage.

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Source: electronicspani

Something about Modulation: Necessity and Types of Modulation | Soukacatv.com A message signal usually spreads over a range of frequencies, called the signal base width. That is why message signals are also called base band signals, representing the band of frequencies of the original signal.

[bynkii]

Why is a man running an educational business advocating for ignorance?

(This was originally published on 30 Nov. 2015 in response to this: https://medium.com/the-mission/why-knowing-stuff-doesn-t-really-matter-f06a5536ab59) I don’t often read things on Medium that makes me think “Are you high?” but “Why Knowing Stuff Doesn’t Really Matter” made me literally think that Isaac Morehouse was tripping balls when he wrote it. Because I cannot, I simply can. not. imagine why someone who in theory, makes money from teaching people stuff, aka “knowing stuff” would publish this…paen to deliberate, methodical stupidity.

The idea that somehow, there is knowledge that is “good” and knowledge that is “bad” is almost ludicrous. Wait, no almost. It’s ludicrous. It’s the kind of thinking that in a cynical vein, is what your classic late-Victorian/early 20th Century factory or mine owner would use on their workers. “You only need to know how to run a milling machine.” “You’re a miner. All you need to know is how to swing your pick where I tell you to swing it.” It’s a phenomenally limiting philosophy, especially coming from someone ostensibly in the education business.

But then I read the Praxis site, and it starts to make sense. Isaac isn’t about education, Isaac is about training and when you want people to value training over education, knowledge for its own sake is indeed a bad thing. I still think he’s completely bonkers, but I understand how his self-interest is at play here. Which makes me even more sad. I’d have preferred his paen to ignorance was the result of too many tabs and not manipulative cynicism designed to bag on “useless” education. Which is what that post is.

However, here’s the thing: training shows you how, and what. Education is where you learn why, and why is in the end, way more important. It’s also more vague, and cannot be neatly compartmentalized into a series of 8-week courses and meetings with startup CEOs. “Why”, is learning “useless” stuff with no immediate value, that won’t help you code better or suck VC privates better.

It’s stuff like learning at 6 that all doors on the outside open out, and then finding out why. Or how to penny a door. Or drive a stick shift. It’s learning that you never need ice for soda from a dispenser to make it cold because the very design of the thing means it’s always cold. Something to do with the syrup in the hoses going to shit if it gets warm as I recall. What was the real-world value in that? Not a goddamned thing. But knowing why I didn’t need ice made me more interested in how soda fountains work, especially since I worked with the goddamned things. As it turns out, the more you know a thing, the fewer problems you have with it.

As it also turns out, knowing why, and the digging that “why” leads you to helps you see beyond the thin veneer of bullshit that people such as Morehouse portray as some kind of fucking wisdom.

Morehouse has a seriously fucked-up thesis in that post: that there is “good” or immediately useful knowledge, and “bad” or not immediately useful knowledge. That thesis is what I would call “shit” or shit.

When I joined the Air Force, I spent, post-basic training, (did you know that if you’re really stressed out, it’s perfectly normal to go weeks without taking a shit? Yeah. If it ever happens, don’t freak out about it. Try dropping your stress levels) at Keesler AFB. For 9.5 months or so, the USAF taught me a lot of electronics and RF. Tubes, transistors, ICs, tracing circuits, reading wiring diagrams, RF theory, how electronic countermeasures really work, (no video game or movie has ever gotten this right, by the way) most of which was of no immediate use on B-1B bombers, which would be the only weapons system I worked on.

(Did you know the value in being able to make awesome piña coladas from scratch? It got me free hotel rooms on weekends during tech school on a regular basis. So, about…oh $300 a month in 1987 money. Amazing what skill with a blender, some time spent working in a Mexican restaurant, and conversations with the hotel owners can get you.)

Being able to strip, test, and reassemble an ALT-32 had no value in the B-1B world, for the -32 was a B-52 system and an old one in 1987. Nor did I ever have to calculate RF loss, I had test sets that did it for me. But you know where that shit was useful? About two weeks after the introduction of the original iBook. Man, as it turns out, having a solid grounding in high frequency RF that I didn’t use between 1993 and 1999 made it really easy to correctly implement a WiFi network.

Not only that, I knew why the base stations had to be placed in certain areas. I also knew what spread-spectrum really was, and the effect it had on signal, along with why antenna polarization matters, frequency is important, and all the rest.

None of that detail was needed for B-1B DAS (Defensive Avionics Systems, what ECM on a B-1B is called.) The plane and the test sets took care of that shit for us. But because I knew the why, the how and the what got easier, including hows and whats I had no goddamned clue about in 1987–88 when I was really learning this shit.

Had I followed Isaac’s advice, I would have actively worked to forget all of it upon leaving the Air Force, since I was an IT tech in a small city government and had no need for any of that knowledge.

For that matter, why was it important I know about things outside of my AFSC, like why a B-1B needs SMCS Vanes, (the “winglets” on the front of the fuselage) or how the FCGMS (Fuel Center-Of-Gravity Management System) works. Or how “Cooling Oil” became “Coolanol”.

Because knowlege. All knowledge. Is good. The current idiocy that partitions knowledge into “good” and “bad” or “immediately useful” vs. “not immediately useful” is just that: idiocy. Did I know as a kid that playing football and baseball would help me have an intuitive understanding of certain aspects of physics? No.

Did I think that years spent standing under a plane with my hands over my head dealing with the unholy rat’s nest that is coax cable connections in a B-1B wing glove would be holy shit awesome training for connecting networking or even HDMI cable when you had to do it blind with almost no room for your hand to work in? Nope. Didn’t even know what ethernet was, and HDMI didn’t exist.

Did I realize how continuously useful a random elective in high school in architectural drafting would be throughout my life? Don’t be stupid, I just liked drawing houses. But ye gods, being able to read basic blueprints and the like? How is that not useful? The months poor TSgt. Frasier spent pounding how to read circuit diagrams into my head has paid off over and over, even though I didn’t do it that much even in the Air Force.

Immersing myself in how things work on a large, complicated aircraft taught me all kinds of things. Like why aircraft toilets are so expensive. And that large systems, like networks, are closer to biological systems than vaguely interconnected nodes. Of course, the biology classes I took helped with that even more. How often in my professional life has biology been directly applicable?

Never.

How often have the concepts behind that biology helped me grok really complicated networks or computer I/O? Countless times.

Knowledge, in a very real way, is life. You are, literally, what you know. The things you learn all work together. The very idea that you don’t want to “waste time with things you don’t need to know” is…well, it’s fucking stupid is what it is. Why would you actively work to limit yourself?

I cannot imagine what it’s like to go through life being deliberately ignorant of “useless” things. Because I’ve never really, outside of generic griping, found knowledge that ended up being truly useless. Maybe…maybe five minutes before I die, I could tell you if there is such a thing. But until then, fuckit, I’m going to learn ALL THE THINGS.

You should too.

[foone]

it's easy (assuming you mean analog NTSC. I don't know anything about modern digital TV. I'm not sure I've even ever seen it?)

step 1: video source. I've used VCRs, laserdisc players, and chromecats/rokus hooked up through an HDMI-to-RCA adapter

step 2: RF modulator. I use rack-mounted Blonder Tongue Agile-Modulator but there are many of these. They take RCA video in and produce an RF output

step 3: attach that to an antenna.

step 4: tune in with your local TV

step 5: do not exceed 1 watt of broadcast power or eventually the FCC, FDA, or USDA will show up at your door with anger. Definitely do not attach any sort of signal amplifier to this setup.

step 6: be cool, now that you have a pirate TV station

if you turn on the TV to the internet channel, they're playing "my country tis of thee" off an old VHS tape.

that's probably not a good sign

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