Synthesized RF link.

[PETNRDX]

I got one of these in some surplus stuff.
This is the one that is based on two GP300's in a Hoffman box.
Continuous duty option.
But, the module that mounts in the center of the box is missing.
My guess is, that missing box is the power supply and basic "repeater" logic (COS & PTT, maybe TOT and hang time)
Anybody know what the pinout of the DB-15 plug is?
If I can find that out, I can use these.
Each radio module has status LED's, and level POT's for RX & TX audio level.

[PETNRDX]

Re-post or Bump.
Anybody know about these?

[35echo]

From the book

Pin 1 Filtered RX audio 450mV unmuted
Pin 2 No Connection
Pin 3 DC Power +
Pin 4 Mode Select/PL Strip, Active Low
Pin 5 TX Audio HI -25dBm minimum
Pin 6 TX Audio LO
Pin 7 SCI+ Programming Pin
Pin 8 Squelch Logic Output
Pin 9 DC Power -
Pin 10 PTT Input
Pin 11 Carrier Detect Logic Output Active Low
Pin 12 RX Audio Output (main) +5dBm max
Pin 13 RX LO/Signal Ground DO NOT USE FOR DC POWER -
Pin 14 Aux RX Audio Out 600 Ohm
Pin 15 Optional Fan DC+ 10.5 - 14.1 VDC

A differential audio output may be obtained from pins 14 to 12 or a 1:1 isolation transformer may be connected across pin 14 and 12 to drive a balanced
600 Ohm impedance line (+ 14dBm max). Pin 10 is not DC isolated, however no harm should result if it is grounded.

Regards,

Allen

[PETNRDX]

Thank you so much.
Exactly what I was looking for.