#rf radio

[relativefict1on]

[andmaybegayer]

When you first learn about phased arrays or beamforming it's easy to be like wow, that's fucked, the net power output of this array is obviously limited by physics, but we can concentrate that energy in one place using interference which has the apparent effect of stealing energy from the low power parts of the field to add power to your high gain area, even though the antenna elements are physically separate and driven separately. It's not like normal antennas which have gain patterns thanks to their cool shapes, which is normal and good and not fucked.

But when you say that you will have the horrible realization that this is also how normal antennas work! A yagi-uda or helical antenna consists of an array of infinitesimal uniform emitters that are phased by space and time to produce non-uniform patterns! The energy is still being magically transported through the ether from one side of your antenna to the other! It's fucked! Everything is fields! Passive elements are insane! A yagi-uda is a bonkers piece of technology because it remotely drives the passive elements and that focuses the field along the axis. I want to get off Mr Huygens Wild Ride!

[runefactorynonsense]

You all have no idea how much self control it takes for me NOT to turn this place into half a baseball blog every October

Gifs between every art piece

But I've never had a bot/spam problem with this fandom blog and I don't feel like inviting general blog problems 😂

[noosphe-re]

Novel antenna design with four concentric spirals, each having 2.5 turns. Rf power is connected to the centre and ground is at the outer connectors

Gans, Timo & Crintea, Dragos & O'Connell, Deborah & Czarnetzki, Uwe. (2007). A planar inductively coupled radio-frequency magnetic neutral loop discharge. Journal of Physics D: Applied Physics. 40. 4508. 10.1088/0022-3727/40/15/021.

[wliam2ttrr]

https://www.futureelectronics.com/p/semiconductors--wireless-rf--receiver-ics/clrc63201t-0fe-112-nxp-2283646

NXP, CLRC63201T/0FE,112, Wireless & RF Receiver ICs

CLRC632 Series Multiple Protocol Contactless Reader IC (MIFARE/I-CODE1) -SOIC-32

[aashiyancha]

The hooligans listen to fall out boy on the radio

[questioningespecialy]

Are EMF’s safe? (come, child, ruin your night)

y’all ready for this? I’m not anti-5G, btw turn your wifi off before bed and maybe stop keepin’ ya phone so close all the time

But like... why, though?

I've had my suspicions about cell towers being hazardous to health for a few years now and felt convinced enough to not bother researchin' it for confirmation. Now that I'm blah blah blah, I decided to actually bother. Since it got kinda heavy, I had to ask myself if I should put in hella more effort creatin' a damn research report of sorts for y'all asses present the info for others like it's a damn PSA. And my conscious won. T~T

But like... what, though?

A base station (aka: cell phone tower) is that shit you see everywhere but never notice. It's usually tall af and has panel antennas on it. It's "used for the transmission and reception of the radio signals between the mobile phones and the network." The problem with 'em is the electromagnetic field (EMF) their equipment can give off... for half a mile. 😐

In short, they've been found to cause health problems. Like cancer. 🤷🏿‍♂️

Fun fact, panel antennas can be installed on the roof/side of buildings that may be directly across the street from someone's workplace... with the antenna at their elevation. 🤷🏿‍♀️

Real Quick

For those who don’t trust EMF-Portal, it (sometimes) has links to the study/article. Full-text PDF can be requested directly from the authors on ResearchGate.net’s article for the study. Full-text PDF can (usually) be found online in English and German with the right search.

5 Studies

V/m = volts per meter 7191 cancer deaths were selected according to the above mentioned criterias out of a total of 22,493 cancer deaths. The most significant causes were lung cancer (19.6 %), stomach cancer (14.1 %), prostate cancer (12.6 %), and breast cancer (11.5 %). The mean electric field intensity of the measurements in 2008 was 7.32 V/m, varying from 0.4 to 12.4 V/m. At a distance of up to 100 m [328.08 ft], the absolute number of deaths was 3569, (49.6 % of all deaths), the mortality rate was 43.4 persons per 10,000 [0.43%] and the relative risk was 1.35 in relation to the mortality rate of 32.1 per 10,000 [0.32%] inhabitants of the entire Belo Horizonte municipality [in Minas Gerais, Brazil]. A mortality rate of 34.8 per 10,000 [0.35%] inhabitants was observed for the residents living within 500 m [1,640.42 ft] of the base stations; this rate decreased for residents living farther from the base stations.

—Mortality by neoplasia and cellular telephone base stations in the Belo Horizonte municipality, Minas Gerais state, Brazil; Science of The Total Environment (2011); EMF-Portal

ResearchGate.net’s article

The result of the study [of 967 permanent residents] shows that the proportion of newly developing cancer cases was significantly higher among those [320] patients who had lived during the past ten years at a distance of up to 400 metres [1,312.34 ft] from the cellular transmitter site, which has been in operation since 1993, compared to those patients living further away, and that the patients fell ill on average 8 years earlier. In the years 1999-2004, ie after five years' operation of the transmitting installation, the relative risk of getting cancer had trebled for the residents of the area in the proximity of the installation compared to the inhabitants of Naila[,Germany,] outside the area.

—The Influence of Being Physically Near to a Cell Phone Transmission Mast on the Incidence of Cancer (original title: ‘Einfluss der räumlichen Nähe von Mobilfunksendeanlagen auf die Krebsinzidenz’); Umwelt · Medizin · Gesellschaft (2004); ResearchGate.net

EMF-Portal

9 cancer cases were observed in the first period 2000 - 2004 and 14 cases in the period 2005 - June 2007 among [1,283] residents living within a radius of 400 m [1,312.34 ft] to a mobile phone base station [in Germany (Hennen, suburb of Iserlohn, Westfalia)]. The mean age of disease onset was 59.2 years in the first period and 59.3 years in the second period in comparison to the expected value of 66.4 years evaluated from the Saarland Cancer Registry. The authors concluded, that a statistically significant increase of cancer incidence was observed 5 years after the base station has been started operating.

—[Incidence of cancer adjacent to a mobile telephone basis station in Westfalia] (original title: Krebsinzidenz von Anwohnern im Umkreis einer Mobilfunksendeanlage in Westfalen - Interview-basierte Piloterhebung und Risikoschätzung); Umwelt · Medizin · Gesellschaft (2009); EMF-Portal

Area A: ≤ 350 m / 1148.3 ft from base station Area B: > 350 m / 1148.3 ft from base station Of the 622 people of area A, 8 cases of different kinds of cancer were diagnosed in a period of one year (from July 1997 - June 1998). The cancer incidence rate was 129 cases per 10,000 [1.29%] persons per year in area A compared to 16/10,000 [0.16%] in area B and 31/10,000 [0.31%] in the town of Netanya [in Israel]. Relative cancer rates for females were 10.5 for area A, 0.6 for area B and 1 for Netanya. The authors conclude that the study indicates an association between increased incidence of cancer and living in proximity to a mobile phone base station.

—Increased incidence of cancer near a cell-phone transmitter station; International Journal of Cancer Prevention (2004); EMF-Portal

ResearchGate.net

Took forever to get this damn infographic just right. >.>

A long-term study was conducted in Germany to investigate the influence of a mobile phone base station on neurotransmitters under true-to-life conditions. µW/m² = microWatts per square meter 24 out of 60 participants were exposed to a power density of < 60 µW/m², 20 participants to 60 - 100 µW/m², and 16 participants to more than 100 µW/m² . The values of the stress hormones adrenaline and noradrenaline grew significantly during the first 6 months after starting the GSM base station; the values of the precursor substance dopamine substantially decreased in this time period. The initial condition was not restored even after 1.5 years. Due to the not regulable chronic difficulties of the stress balance, the phenylethylamine levels dropped until the end of the investigation period. The effects show a dose-effect relationship and are situated far under the valid limit values.

—[Modification of clinically important neurotransmitters under the influence of modulated high-frequency fields - A long-term study under true-to-life conditions] (original title: Veränderung klinisch bedeutsamer Neurotransmitter unter dem Einfluss modulierter hochfrequenter Felder - Eine Langzeiterhebung unter lebensnahen Bedingungen); Umwelt · Medizin · Gesellschaft (2011); EMF-Portal

ResearchGate.net’s German article EMF:data page (German)

While I did find 17 different figures for it, I’mma save myself the bother of describin’ dat noise and not include ‘em thanks~.

But what does the FCC say?

FCC.gov’s conclusion seems to be that they’re generally safe for civilian life as long as you don’t get close and aren’t directly in front of the antenna’s trajectory (don’t climb a fuckin’ tower or enter those rooms/buildings). A very “it’s fine” set of conclusions tbh. Hella contrasted by other sources.

Nonetheless… below is the index...

FCC’s RF Safety FAQ Index:

What is "radiofrequency" and microwave radiation?

What is non-ionizing radiation?

How is radiofrequency energy used?

How is radiofrequency radiation measured?

What biological effects can be caused by RF energy?

Can people be exposed to levels of radiofrequency radiation and microwaves that could be harmful?

Can radiofrequency radiation cause cancer?

What research is being done on RF biological effects?

What levels are safe for exposure to RF energy?

Why has the FCC adopted guidelines for RF exposure?

How safe are mobile phones? Can they cause cancer?

How can I obtain the specific absorption rate (SAR) value for my mobile phone?

Do "hands-free" ear pieces for mobile phones reduce exposure to RF emissions?   What about mobile phone accessories that claim to shield the head from RF radiation?

Can mobile phones be used safely in hospitals and near medical telemetry equipment?

Are wireless and PCS towers and antennas safe?

Are cellular and other radio towers located near homes or schools safe for residents and students?

Are emissions from radio and television antennas safe?

How safe are radio antennas used for paging and "two-way" communications?   What about "push-to-talk" radios such as "walkie-talkies?"

How safe are microwave and satellite antennas?

Are RF emissions from amateur radio stations harmful?

What is the FCC's policy on radiofrequency warning signs?  For example, when should signs be posted, where should they be located and what should they say?

Can implanted electronic cardiac pacemakers be affected by nearby RF devices such as microwave ovens or cellular telephones?

Does the FCC regulate exposure to radiation from microwave ovens, television sets and computer monitors?

Does the FCC routinely monitor radiofrequency radiation from antennas?

Does the FCC maintain a database that includes information on the location and technical parameters of all the towers and antennas it regulates?

Which other federal agencies have responsibilities related to potential RF health effects?

Can local and state governmental bodies establish limits for RF exposure?

Where can I obtain more information on potential health effects of radiofrequency energy?

The Government Accountability Office (GAO) prepared a [2012] report of its investigation into safety concerns related to mobile phones.  The report concluded that further research is needed to confirm whether mobile phones are completely safe for the user, and the report recommended that the FDA take the lead in monitoring the latest research results.

Professional Opinion...

Safe Distance from Cell Towers…

It is also difficult to predict a safe distance from cell towers.  For example, cell towers are designed to transmit most of their radio frequency (RF) energy horizontally.  Some areas below the tower may have lower levels than locations farther away that are more in line with the vertical height of the antennas. The exposure from a cell tower will depend on the type of antennas, the number of antennas, how much the antennas are actually being used, the time of day, etc.  The distance needed to reduce exposures down to the General Public Precautionary Level of 100 microwatts per meter squared (μW/m²) is often around a quarter of a mile (1320 feet) or more.  Due to the uncertainty, on-site testing with a broadband RF test meter is strongly recommended. A German study reported that people living within 400 meters (1312 feet) of cell towers had over 3 times the normal rate for new cancers (City of Naila 2004).  In an Israeli study, the relative risk for cancer was about 4 times greater within 350 meters (1148 feet) of the cell tower (Wolf et al. 1997).  Based on findings like these, a minimum safety distance of 1/4 mile (1320 feet) might be considered prudent. (...) The suggestions for safety distances in this chart are generally based on Michael Neuert’s [engineer, licensed electrician, and health educator] professional on-site testing of the various EMF sources in the San Francisco Bay Area since 1992.

—What Distance is Safe? By Michael R Neuert, MA, BSME, ©2023

helpful table if you want all that info: What EMF Level is Safe? By Michael R Neuert, MA, BSME, ©2023

i know what i said

Based on the accumulated evidence, we recommend that IARC [the International Agency for Research on Cancer] re-evaluate its 2011 classification of the human carcinogenicity of RFR [radio-frequency radiation], and that WHO [the World Health Organization] complete a systematic review of multiple other health effects such as sperm damage. In the interim, current knowledge provides justification for governments, public health authorities, and physicians/allied health professionals to warn the population that having a cell phone next to the body is harmful, and to support measures to reduce all exposures to RFR.

—Risks to Health and Well-Being From Radio-Frequency Radiation Emitted by Cell Phones and Other Wireless Devices; Front Public Health (2019 Aug 13); NCBI

Lookup (or pull out) your cellphone’s manual and search for the sections on “radio frequency exposure” and “Specific Absorption Rate (SAR) information” to see how close the phone can safely be kept near your body… and that it should be kept away from “the bellies of pregnant women and for teenagers, away from the lower abdomen.” 😐

For an informative giggle, here’s the “Harmful Cell Phones” segment from season 7 of The Colbert Report.

[spaceintruderdetector]

RF NOMAD Eurorack Shortwave Reciever module

[joehaupt]

Vintage Panasonic Transistor Radio, Model RF-800, AM-FM Bands, 9 Transistors, Made In Japan, Circa 1965 by Joe Haupt

[relativefict1on]

we moved on too fast

[equiptest]

Buy Now Flying Probes From Equip Test

The concept of a flying probe test that accesses components on printed circuit assemblies (PCAs). Flying probe upgrades bed of nail fixture and takes advantage of probes to replace bed of nails. The flying probe technology tests the boards without using a special bed of nails adapter. For more information visit https://bit.ly/3yq0wgP

[sunrentechnical]

Safety Testing for BIS Certification: Ensuring Product Compliance

Sunren specializes in Safety Testing for BIS certification, guaranteeing that your products meet stringent safety and quality standards. With advanced facilities and a team of experts, we provide comprehensive testing solutions for electrical, electronic, and telecom equipment. Trust Sunren's NABL-accredited lab for precise, reliable results, ensuring your products comply with Indian safety regulations and gain market approval efficiently. Whether it’s RF, environmental, or electrical safety, Sunren supports your compliance journey seamlessly.

[careplusmedicalaesthetics]

Dry Eyes and Discomfort? Radio Frequency Therapy Might Be Your Solution

Dry, irritated eyes can turn everyday tasks like reading, working, or even watching TV into uncomfortable experiences. While conventional treatments like eye drops or warm compresses offer temporary relief, they often fail to address the root cause. Enter Radio Frequency (RF) dry eye treatment, a cutting-edge solution that targets the underlying issues causing dry eyes, providing long-lasting comfort and improved eye health.

For more information, visit here:

Email: info@careplusmedicalaesthetics.com 

Address: 1-1304 Commissioners Road W, London, ON N6K 1E1 

Phone No.: (226) 663 - 0358

[jeoy2troo]

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--schottky-diodes/2n7002kq-7-diodes-incorporated-6022076

Surface Mount Schottky Barrier Diode, Schottky barrier diodes, detector diodes,

2N7002K Series 60 V 380 mA N-Channel Enhancement Mode Mosfet - SOT-23-3