Astatic Silver Eagle

Astatic Silver Eagle

In the shack I also have an Astatic Silver Eagle microphone. Normally, this has a very distinctive sound to it due to the crystal microphone element and the built-in pre amplifier.
The crystal element has deteriorated with age to the point where it became unserviceable. Due to the fact that these have not been in production for many years, sourcing a genuine replacement has now become an almost impossible task.
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Audio Processing Rack

The Audio Processing Rack

In order to improve the quality of the transmitted audio, I have invested in a good quality microphone and a few items of audio processing equipment. Of course, this is my personal shack setup, and other people will have different ideas about what sounds good to them and how to set up their particular choice of equipment. Read Complete Article...

Baofeng UV-5R

Baofeng UV-5R VHF/UHF handheld

Another useful handheld radio is the Baofeng UV-5R.
This cheap and cheerful Chinese radio makes an ideal companion when working outside or hiking around rough terrain. The low cost of these radios means that should it get damaged or lost then it really isn’t a major problem.
The UV-5R features 128 programmable channels with priority channel scanning, dual watch and 1750 Hz call tone making it quite comparable to much more expensive radios.
The UV-5R also features built-in VOX (Voice Operated Transmit) for hands-free operation and a high illumination flashlight, neither of which is sported by the Yaesu.
As with most Chinese products, the user guide could be better written or translated.

Behringer Xenyx 802 Mods

Behringer Xenyx 802 mixer

The 802 audio mixer from Behringer is a basic and compact unit designed primarily for home/hobby use. While all the basic needed features are included, it does lack some of the extras found on larger mixers. A really useful function of any mixer is the ability to send the audio signal out of the mixer to an effects unit and then have the signal return to the mixer for level adjustment. Read Complete Article...

Build a Simple Serial Port Interface

What is a serial port interface?

In simple terms, a serial port interface translates signals from a computer serial port to be used to place a transceiver into transmit or send CW (morse code) characters. A computer serial port usually has 9 pins, although some older PC’s may have 25 pin serial ports fitted. Both types carry out the same function, the only difference being the size and the pin connections. As it’s name suggests, a serial port sends data serially, in other words, each piece of data is sent one after the other. Read Complete Article...

Data Modes (digimodes) with examples

Digital Modes

In the world of radio communications there are many varied methods of using digital signals, known as digimodes. Often argued as the earliest form of digital mode is Morse Code or CW as it is also known. In morse code an audible tone is either on or off. This equates to the digital (binary) states of 1 or 0 transmitted over the air. Modern digital communication is simply sending data bits consisting of 1’s or 0’s, in other words, on or off as in CW at extremely high speed. Read Complete Article...

Digital Radio

Digital Communication

In the past the only way amateur radio operators used to send data was using conventional analogue methods. This is often achieved by inserting the data stream as an audio signal in place of voice. It should be noted that this method of data transmission is far from dead, and is still thriving. Further information on data modes (digimodes) can be found on this page. Read Complete Article...