This is a Swedish military radio, the export version of the SRA (Svenska Radioaktiebolaget) RA 135.
It is a very light radio, likely to be used by infantry troops on the field.
It operates from 42 to 43MHz and has 6 channels. The power output is about 0.7W FM
Power range is from 12 to 15V.
There are two volume levels for the squelch. The original handset had the volume control on it.
This radio came with no battery. I made one using 4 LiFeP04 cells and a S4 BMS. It ended up with 1300mAh, not bad.
The connector is similar to the one used by Racal radios, and the pinout for audio, mic and PPT is the same. I didn’t tried to power it from this connector.
Each channel has its own quartz, and the final frequency is given taking the 12Mhz from the FI out.
The antenna that came with it, is not a perfect match, it is tuned to 60Mhz, and with a counterpoise it goes down to 1.10 SWR on that frequency.
If you know what this BNC could be for please let me know on the comments. Maybe a signal injection to use it in other frequencies…
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Негізгі бет Ойын-сауық SRA PR81 (RA 135) Swedish Military Radio
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