Ramsey Electronics FZ-146 Specifications download pdf (Page 17)

FX-146 • 17

VHF PACKET DATA OPERATION

Your FM transceiver was planned and designed to accommodate easy and

reliable VHF packet radio operation.

The J1 Packet I/O port can be quickly connected to many modern TNC's and

the Ramsey P-IBM or P64 Packet Modems with Radio Shack's shielded DIN

cable (42-2151). Otherwise, your first step is to prepare a reliable 5-

conductor cable with a 5-pin DIN plug (RS 274-003) at one end, and the

correct connector needed by your packet TNC at the other end. If you

salvage a "ready made" 5-pin DIN cable from something like a discarded

computer joystick, be sure that there are indeed 5 wires, or at least the ones

that are required by your TNC!

Consult your Packet TNC or Packet Modem documentation for ALL details

on hookup and operation. Pin 4 of J1 offers a choice of amplified and

squelched (speaker level) audio output or low-level (discriminator) output.

This choice is set up by the jumper wire positions clearly visible on the PC

board.

Packet RX Audio Jumper: Some TNC's require low-level audio from the

discriminator output of the FM detector, while others will accept speaker

output. Either is available in the FX transceivers. Simply install a jumper in

the appropriate location near VR1, to connect "EXT AUDIO" to either

"SPKR" for speaker audio or "DATA" for discriminator audio. Use scrap

resistor wire to make the jumper. You also can choose to wire these three

points to a miniature SPDT switch which you can mount on the rear panel

near the packet connector. OR, use a PC mount switch in the jumper area

itself.

Use this space to diagram your TNC cable connection:

DRAW YOUR TNC

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 144 145

No comments

Ramsey Electronics FZ-146 Specifications Page 17