Great for Amateurs on VHF Low Band
This radio equipment is dated that's for sure and although I have given a description of the equipment below, I don't have much further information - it would have been nice to have a schematic/circuit diagrams for the modules but alas there is none - it's an experimenters feast or just butcher the modules for the special parts such as the RF PA output transistors etc
From what I have observed of this equipment, I can offer the following information.
Most likely original AWA Mobile transceivers running around 77Mhz
No manufacturers ID anywhere, the only clues are the pcb numbers
I have five of these units, price is per unit although some are not complete (see notes below)
I would be most happy to see someone take the lot, (discount on offer if this is the case) that is probably wisest so that you have plenty of boards to work with.
I have powered up the equipment (12V) but didn't bother with connecting speaker/mic or antenna - I just wanted to see the idle current, which is around .5mA so this gear is most likely waiting for me to tell it to do something!
A complete transceiver comprises the following:
Top side
IF Mixer Board - ID is 8201-4-1A
External RF connections are via miniature sockets
Two connections on this board, ANT and Local Osc
Custom patch board (vero based) where it appears that various configurations can be wired, this also seems to be the point where access to audio out and mic input is available.
There is a 4 way ribbon cable connected to a DB style socket for external connection to something.
That's it for the top section, just two boards
Lower section:
RF PA Board - 8308-4-5A
Using a Mitsubishi 2SC2630 output transistor
Main external antenna connects to this board via coax from the rear BNC socket. Looks to be a RX/TX switch arrangement on this board.
RF Driver Board - 8308-4-4A
The main transistor on this board is another Mitsubishi, type 2SC2094
Control Board - Oscillator etc Board B305-4-2A
This appears to be the heart of the transceiver, EPROM installed is marked as
CHO to 4
F3 DA
2x SIM 3x Dup
Local Oscillator signals come from this board.
It would seem these transceivers have been reprogrammed for use from 77Mhz down to the 6 metre band, specific frequencies mentioned on the labels are
52.650Mhz
52.525Mhz
52.675Mhz
52.850Mhz
Three locations are also noted: Terry Hills/Dural/Kurrajong - this strongly indicates to me that these were in use with the ARNSW network on 6m
So I have five units, this is their condition:
1) Has all boards EXCEPT the 8201-4-1A IF Board
2) Complete with all boards and interconnections
3) Complete with all boards and interconnections
4) Complete with all boards and interconnections BUT the EPROM seems to be still programmed for 77Mhz, although receive is indicated as 52.650Mhz
5) Case, no covers fitted and just the RF PA Board and RF Driver Boards are fitted - all the other boards are not present
Spare parts, 6 metre transceiver project, just use the case? Its all on offer for the enquiring mind/experimenter.
A couple of the transceivers have notes stuck on them which indicate that RF power output has been set to 10W
NOTE: Of course, to transmit legally on 6 metres you MUST be the holder of a current Amateur Radio Operators licence.
