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Aphex 320D Compellor Stereo Audio Level Controller – Used

$595.00

Wings for the Word -- by Arlene Cornelius

Stories from the lives of Rolen and Arlene Cornelius, radio missionaries in Africa and the Caribbean

PDF and Audio Book

The APD-D series Automatic Pressurization Dehydrator is designed for reliable pressurization of elliptical waveguide, coaxial cable and rigid transmission line systems. Dry pressurized air in the distribution system ensures that condensation is avoided and optimal system performance is achieved.

The dehydrator includes a self-contained completely automated air drying system that utilizes a pressure swing moisture adsorption cycle to provide pressurized dry air while continuously purging the collected moisture to the atmosphere. This eliminates the need for replacement or manual reactivation of the desiccant and makes our APD-D series dehydrators ideal for unattended operation, even at remote sites.

The dehydration system is completely automatic, with no need for periodic media replacement or reactivation. These units are capable of years of trouble-free service when properly installed, operated and maintained.

PCIMAX3000+ is a computer card that will change the way you either do radio or listen to your MP3’s or other audio via PC. It will effectively change your PC into a powerfull broadcast worthy stereo FM radio station, it is a small digital FM transmitter in a form of a PC card. You will be able to play your audio files (CD, wav, MP3, real audio etc.) from your PC through radio waves directly to your household radio receiver in the next room, in the living room, across your yard, in whole block of flats….or for the entire village/small city. You need just an ordinary radio receiver to receive your signal. The included software lets you set the frequency and the output power.

Narrated by James Golden, Limbaugh’s long-time call screener and “official show observer” known to listeners as “Bo Snerdley”, the 12-episode series will detail legendary radio host Rush Limbaugh’s award-winning, 30-plus year career in radio that revitalized the spoken-word format, and provided a platform for him to develop and lead modern conservatism in America. Featuring Limbaugh’s own words and never-before-heard stories shared by colleagues, friends and family, the series will give listeners a guided tour of the five-time Marconi Award winner’s historic journey from Cape Girardeau, Mo., to becoming the No. 1 talk radio host in America

The Goon Show
Radio 4 Extra
Spike Milligan, Harry Secombe and Peter Sellers star in BBC radio's groundbreaking classic comedy.

EPISODES (104 AVAILABLE)

Shortwave retains a role in serving particularly difficult-to-reach audiences

Russia’s horrific invasion of Ukraine and its simultaneous blocking of Western media outlets has renewed public interest in shortwave radio broadcasters like the federally funded Voice of America. //

“In some areas shortwave is not considered as important as it used to be, mainly due to the proliferation of other media platforms such as internet and satellite-based systems and the media consumption habits of the target demographic in those areas,” Straub said.

“However, in other geographical areas such as Africa, shortwave continues to be very important, as evidenced by the addition of USAGM shortwave capability to this area.”

This is a position that makes sense to Dan Robinson, much as he wishes it didn’t.

“There’s a difference between what I would like to see as someone who was always interested in shortwave and saw the impact that it used to have, and what I think makes sense today,” he said. “At the same time, much of the shrinkage has been driven by VOA, BBC and other broadcasters pulling back from shortwave and their listenership falling as a result, not vice versa.” //

What remains to be seen is how the apparent drop of a new “Iron Curtain” across parts of Eastern Europe affects the West’s ability to reach listeners there. Even today, shortwave’s advocates say that SW remains the cheapest, easiest to conceal and hardest to block option for listeners in Ukraine, Russia and other countries of interest to Vladimir Putin.

Slavic broadcasters take different approaches as legal and societal efforts to combat propaganda impact worship and evangelism.

Software containers are taking modern business and broadcast infrastructure to the next level. Register for upcoming industry-leading learning sessions or view past sessions on-demand. Designed to educate and empower broadcast engineers, Container University is your hub to learn about this proven reliable technology and hear how it’s exactly right for broadcast operations.

If you lack a shortwave radio and a dig around all your family’s junk hasn’t turned up a relic from decades past, then the simplest way to get one is of course to buy one. AliExpress is full of “world band” radios starting from somewhere under $20, and if you don’t mind waiting for shipping from China then it’s the path of least resistance.

But there’s the problem, international events are moving fast and there might not be the luxury of waiting three weeks, or even for that matter of being able to order one at all in a warzone. How can you make one? //

geocrasher says:
March 17, 2022 at 8:56 am
If anybody would like to build a Direct Conversion receiver from scratch, I have documented a design and build on my site. It covers the theory of operation as well as construction techniques, and uses the si5351a as an oscillator with an Arduino for control. Has to be heard to be appreciated :)

https://miscdotgeek.com/building-direct-conversion-receiver-part-1/

http://websdr.org/

Today, digital radios with direct pushbutton entry are commonplace in the portable SW portable receiver market.

I recently tested two such portables, the pocket-sized CCrane CC Skywave SSB and the new tablet-sized Sangean ATS-909X2.

In addition to offering pushbutton tuning and automatic frequency scanning, both come with manual tuning dials, back-lit LCD displays, the ability to tune to the full SW bands (1.711–29.999 MHz) plus AM, FM (stereo in headsets) and the AIR (aeronautical 118–137 MHz) band. The ATS909X2 can also tune to longwave.

They also offer a range of bandwidth filters to improve audio clarity on SW, the ability to preset station memories, and built-in SSB (single sideband tuners) for tuning in amateur radio transmissions heard within the SW bands. //

At $169.99, the CCrane CC Skywave SSBis the less expensive of these two SW radios.

15 LCD keys poised to trigger unlimited actions. One-touch tactile operation lets you control apps, launch social posts, adjust audio, mute your mic, turn on lights and so much more, while visual feedback confirms your every command.

The rollout of 5G cellular phone service has started affecting operations around the country—a terrific story in The Air Current by Jon Ostrower detailed the confusion at Palm Beach International yesterday, writing, “The aircraft’s radar altitude abruptly ran down to zero, causing repeated loud aural warnings: PULL UP WHOOP WHOOP DON’T SINK TOO LOW GEAR. The flight landed without incident in good weather, but it wasn’t the first time. ‘Exact same location multiple times the past two weeks,’ the pilot, who was on the flight deck for both anomalies, told The Air Current.”

And now Airbus has issued guidance to pilots that details the many things that could go wrong with their planes’ systems if the radar altimeter, built into a handful of systems, including Autoland and Ground Proximity Warning Systems, were to get erroneous readings.

https://theaircurrent.com/aviation-safety/5g-network-disruption-cluster/

Radiofrequency radiation is relatively low-energy, and it can't break chemical bonds. Like the nearby microwave frequencies, it can heat tissues. But we're not aware of any mechanisms beyond heating by which radiation at these wavelengths can damage human tissue. And there's no evidence at the population level indicating that radiation from these sources poses any sort of risk.

5G is no different. It does transmit on different frequencies in some situations. But these frequencies are generally blocked by things like walls, and they are also low enough energy that they won't cause molecules to break apart. Also, no, 5G does not make you more vulnerable to COVID-19 by weakening your immune system, nor do 5G signals give rise to the virus itself. //

By contrast, the adverse effects of ionizing radiation are well-known and well-documented. Ions are just electrically charged atoms. Cations have more protons than electrons and hence have a positive charge, while anions ("negative ions") have a negative charge because there are more electrons than protons. High-energy rays can knock electrons off of atoms, and the resulting free electrons then collide with other atoms to create even more ions. This can cause unnatural chemical reactions in living cells, breaking apart DNA chains so that the cell either dies or mutates to become cancerous.

That's why many scientists who worked with X-rays in the early days after their discovery lost their hair and developed cancerous tumors. Marie Curie was exposed to radioactive elements through her experiments, and she liked to carry around vials of radium because the glowing tubes looked like "fairy lights" at night. She eventually died of aplastic anemia linked to that radiation.

The ionizing radiation emitted by the quantum pendant and similar products is significantly lower, as the ANVS acknowledges, but prolonged continuous wear could nonetheless be harmful. Back in 2016, Amal Graafstra, who founded the biohacking supply company Dangerous Things, tested a "negative ion" silicon wristband by placing it against a Geiger counter. He discovered the band was emitting more than 2 microsieverts (or 0.000002 sieverts) of radiation every hour.

That's well below the 1-sievert threshold needed to cause radiation sickness, but if one wore the band for 24 hours, it's roughly equivalent to getting five dental X-rays in a single day. Wear it 24 hours a day for a year—as someone who fears 5G exposure might do—and you'll be exposed to 21.9 millisieverts, which is half the maximum permitted exposure for radiation workers in the US. Small wonder that the US Nuclear Regulatory Commission has warned of the potential dangers associated with wearing such products over a long period of time.

The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New
York, and it meows in Los Angeles. The wireless is the same, only without the cat." - Albert Einstein ///

Possibly apocryphal, like m good quotes

One of the best tools in the engineer’s lightning protection toolbox is a tried, true and frequently underutilized friend, the ferrite toroid.

The principle is quite simple. If you have two (or more) conductors passing through a ferrite, such that the net sum of their currents is zero, then the ferrite is an inert object, just sitting there waiting for something to happen.

If, as in the case with a surge or lightning strike, the current on any conductor increases, such that the net current is no longer zero, then the ferrite core saturates, creates a magnetic field and attempts to induce an equal and opposite current flow in the other conductor(s) — in effect, trying to maintain the zero net total current.

For this reason, ferrites are a very good tool in many ways, not the least of which is lightning protection. Used on a coaxial cable going out to the antenna system, they can also be useful for finding ground loops.

If you have a ground loop, such that not all of your return current is through the coax shield, the ferrite will saturate — and quickly (depending on the amount of the imbalance between feed and return) get physically warm … in extreme cases, I’ve even seen them explode!

Easy to Install

You want ferrite toroids at the output of the transmitter, preferably before the point where the coax shield is connected to the station reference ground (usually where the coax enters the building, but not always, so keep an eye out).

In the course of the installation, ferrites can and should be placed on pretty much every current carrying conductor, including AC lines, remote control feeds and audio/AES lines (don’t forget the STL antenna cable).

For any cable where there is a safety ground connection (for example, the antenna feedline ground referenced above, or an AC mains surge protector), ensure the ferrites are installed between the ground and the equipment being protected. That makes the reference ground connection look like a better path than the equipment, by raising the effective impedance lighting or surge current has to overcome to get to the equipment.

Another use for toroids is helping to reduce pickup (for example, the RF from your AM station getting onto the audio feed for your FM station). The principle is much the same as for lightning protection: The ferrite will help to filter any signal that is not present in equal amplitudes in both the feed and return paths.

Nautel offers several ferrites that can help, and you can order them via our Parts Quotation Request form at http://support.nautel.com/parts.

Some useful part numbers:

• LXP38 — this is a 3/4-inch inside diameter toroid, good for RF rejection and lightning protection on small signal cables.

• LP23 — a 2-1/8-inch inside diameter toroid, good for most heavier AC cables and coax up to 1-5/8 inches (as long as the connectors aren’t already installed!)

• LP32 — a 4-1/8-inch inside diameter toroid, good for the really big AC and RF cables (again, this won’t fit over a 3-1/8-inch EIA flange, so keep that in mind when planning)

• LA52 — a small (1/4-inch inside diameter) clip on ferrite that helps to keep higher frequency (FM) RF out of control and signal wiring. Impedance curve shows 320 ohms at 100 MHz, so it wouldn’t be so good for an AM station, but definitely useful for a higher power FM.

These are RF band-pass filters/shorted quarter wave shorted stub traps. They are a DC short that will pass an FM radio frequency with little or no attenuation. //

Above is the test setup required to calibrate the trap to the correct frequency. A return loss bridge is used in conjunction with an RF spectrum analyzer and 50-ohm dummy load. The analyzer display is a VSWR picture of the performance of the trap at the frequency of interest.

These filters are normally used at the output of an FM (88 - 108 MHz) solid state broadcast exciter as a voltage spike protector. It is, in essence, a shorted quarter wave stub made of 50 ohm transmission line. They are needed on FM transmitters where the next stage of amplification is a tube. An arc in that tube could send a spike of hundreds or thousands of volts back to the exciter causing failure of the exciter's output stage.

Since the filter is DC shorted at the end, it presents a direct short to any DC voltages. It passes the FM frequency of interest because the cable is cut to an exact length. Each filter is cut and tested using a spectrum analyzer with tracking generator and return loss bridge. The return loss at the specified frequency is typically 45 dB, which a VSWR of 1.01:1.

Sometimes they are used at the output of a low power FM station or an FM translator to give lightning protection to the final amplifier. They will also help reject second harmonic radiation as well as offer some attenuation to carriers that are not on the frequency they are cut for. //

Another piece of protection equipment you may want to consider is a shorted quarter-wave stub. One can be placed on the output of an FM exciter, ahead of a tube transmitter, so that any tube arcing is shorted to ground and will not be fed into the exciter.

Our Radio World colleague Mark Persons has an interesting article on his website www.mwpersons.com describing its use. Select “Tech Tips” and look for “Stub Protector for FM Exciters and Transmitters” under the FM Tips column.

The quarter-wave shorted stub connects between your transmitter and your antenna system to short the center conductor to ground. This provides lightning protection for your transmitter. Should lightning strike your tower, the high-voltage pulse travels down your transmission line and meets the stub, where it is shorted to ground.

The stub is virtually invisible to your transmitter and offers 0 dB of insertion loss and an input VSWR better than 1.01. Return loss values are typically greater than –50 dB. Both fixed and frequency-agile models are available.

A real benefit is that the stub is maintenance-free, even after a discharge. There are no parts to replace.

The shorted stub acts as a broadband filter, and in sites where FM is collocated with AM, the latter signal is reduced by more than 30 dB. //

https://www.xenirad.com/