United States Air Force
Military Affiliate Radio System
"Providing the reins of command in emergencies"

Technical Information

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AFF1N's Bazooka Antenna




Audio Interface

T1 and T2 are 8 ohm to 1K ohm (Radio Shack)
This is an inexpensive interface between the computer and tranceiver. There are a number of methods for interfacing with the transceiver. The microphone and headset sockets will work for all of the transceivers. Most all newer transceivers have mic input, audio out and PTT all in the microphone socket. And, most all newer transceivers have an auxillary in/out (ACC) on the back panel. The drawback of the ACC is controlling the audio out; it's usually a fixed level output.
This interface can be used for all of the soundcard digital mode software, such as MixW, etc, as well as broadcasting the MMTS's. The MMTS's are in .wav files on the computer hard drive. I eventually used a small plastic "hobby box" to mount the components after trying a metal box. The input/output points are RCA jacks which I found have to be isolated one from the other, thus the plastic box; all of the leads are shielded wire. As a side note, it is possible to record .wav files from the transceiver, too.
The computer soundcard control is used to vary the input and output levels. I use a small mixer in my application, though, and found that it is easier to control the levels with the mixer.
There is a lot of very good antenna information courtesy of N4UJW on the Links Page.
Check the home-brew balun, especially.

Looking for a Modification for your rig? Check the Links page!
Somewhat on the Tech side, here's the MARS Message Generator. It will give you the correct MARS message format as well as all of the information required for an EEI.
CLICK HERE TO DOWNLOAD
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