packet:gm1280
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Table of Contents
Motorola GM1280
The Motorola GM1280 support trunking, but also has a “conventional” mode which makes it useful for packet radio. It has been found to work with the 9600 baud GFSK mode which is great for a fast packet link.
Power
The radio nominally uses 13.2V, but works happily at 12V too. The power connector on the rear is SAE, commonly used in the automotive industry.
Physical Connection to TNC
On the back is a 20-pin accessory connector which provides pins for flat audio receive and transmit, data PTT, and ground.
A strip of standard PCB female headers fit perfectly into one row of the 20-pin socket if you do not have an appropriate plug.
NinoTNC connection
| 20-Pin Accessory | NinoTNC pin |
| 5 FLAT_TX_AUDIO | 1 |
| 3 DIG_IN1 (DATA PTT) | 3 |
| 11 FLAT_RX_AUDIO | 5 |
| 7 GROUND | 6 |
packet/gm1280.1739034466.txt.gz · Last modified: 2025/02/08 17:07 by 2e0hkd