Motorola GM radio

[Torquetube]

Hi all,

Has anyone used a Motorola GM radio such as a GN340 to decode Pocsag? There is a discriminator output to pin 11.

According to the spec: The nominal output level for Discriminator Audio is 330m Vrms at 60% deviation. However I haven’t had much luck with it working.

Any ideas would be greatly appreciated.

[VidarParry]

How are you connecting to the PC?
Have you tried it with a USB interface?

Cheers
...Steve

[Torquetube]

Hi all,

Just an update in case anyone stumbles across this post, I can confirm that a Motorola GM340 works perfectly with an RS232 interface. The pins to use on the rear connector are pin 7 (gnd) and pin 11 (discriminator). Just a note that pin 11 needs to be setup using the CPS to ensure it’s a discriminator output and not filtered.

Hope this helps someone.