[aprssig] GM-300 speaker output

[Rich Osman]

Scott,

The correct (latching and keyed) connector is an AMP shell 104422-1 and
contacts are 1-87309-3 (or anything from that family.) Digikey used to
stock, but not catalog the shells. Now they only have the contacts in
stock.

The radio accessory connector pinouts vary by radio model number. You'll
need to be careful to look at the variations.

Rich Osman, N1OZ

Scott Miller wrote:
> I meant a tracker or TNC. I see now that it's got a discriminator
> audio output - I'll check that out. I've had a couple of inquiries on
> these things lately, and I've still got a couple of old units in the
> shop that I haven't ever had time to set up.
>
> Thanks,
>
> Scott
> N1VG
>
> Rich Osman wrote:
>> I'm not sure what you want ot hook up. If it's a speaker, just float it
>> across the speaker outputs. The output is a very low impedance (~2 ohms,
>> maybe 4) so if you use an 8 ohm speaker you won't get much audio. The
>> internal speaker is just a jumper connection and isn't bad in normal
>> use.
>>
>> If you want to use that output to drive a tracker input, just cap couple
>> it. I'd use the RX audio pin if I was you, the front panel volume
>> control doesn't mess with it. I'd also program one of the general I/Os
>> to be COS out and use it to gate the tracker.
>>
>> note that the accessory connector pinouts vary by model.
>>
>> http://www.batlabs.com/gm300.html
>>
>> Scott Miller wrote:
>>> What's the best way to hook up a GM-300 with floating speaker outputs?
>>> With an isolation transformer, or is there a simpler way that won't
>>> blow up the audio amplifier?
>>>
>>> Scott
>>> N1VG
>>>
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>>
>
>
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Rich Osman;  POB 93167; Southlake, TX 76092 (Near DFW Airport)