Author Topic: Motorola GM radio  (Read 330 times)

Torquetube

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Motorola GM radio
« on: 21 Apr 2019, 16:46:57 »
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

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Re: Motorola GM radio
« Reply #1 on: 27 Apr 2019, 05:29:26 »
How are you connecting to the PC?
Have you tried it with a USB interface?

Cheers
...Steve

Torquetube

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Re: Motorola GM radio
« Reply #2 on: 07 Oct 2019, 07:07:58 »
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.