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AN/SRQ-420 Secure Jamproof Radio

In need of secure and jam proof communications? Worried that your command guided missile will be taken down by a stupid jammer before getting close to the target? Concerned that someone might take over your drone and shoot you back with it? Not a fan of spilling company secrets to the competition? Look no further but to the AN/SRQ-420!

This microcontroller is a HAVE QUICK type communications radio. It utilises an ECM resistant frequency-hopping system with a 60Hz hop rate (each tick a different frequency, provided by a Cryptographic Pseudo-Random Number Generator (CPRNG) is used) to provide secure and jam-proof communications. This radio will not interfere with regular communications in the standard band below channel 2000 at any time.

1. Install the AN/SRQ-420 by placing any radio RX antenna, the necessary monitor and clock and connect it all together.
2. Use any method to control the channel which the radio will use. You can use another radio controller to provide a channel number to the AN/SRQ-420, which will utilise its internal channel pool.

For multiple radios:
To accommodate for multiple radio stations using different channels you can use multiple AN/SRQ-420 controllers but with composite input connected to the same display and video only from a single one which will ensure all AN/SRQ-420 controllers use the same cipher key, making secure communications fast and easy.


Without frequency hopping:
1. Set operating mode to PLAIN
2. Choose channel
3. The radio operates like a regular radio, providing no jam resistance but allows communications with any radio station not equipped with the AN/SRQ-420

With frequency hopping:
1. Set operating mode to SAFE
2. Set the same cipher key for all the radio stations that are supposed to communicate with each other.
3. Choose channel
4. The radio operates in frequency hopping mode providing jam resistance and preventing eavesdropping. Communications will only be available with other AN/SRQ-420 stations with the same cipher key. From now on you can use the connected radio station like a regular radio and choose whichever channel you like.

NOTE:
If there is another set of AN/SRQ-420 radios set with a similar cipher key (off by a digit or two) the two radio sets may develop minor interference with one another. This should no longer be an issue after the early life upgrade but in case of that happening choose cipher keys that are differing by a higher number of digits.

NOTE:
This controller uses the clock to synchronise frequency hopping between antennas. It is very likely to fail to operate correctly when the time of day is overridden.