[aprssig] GM-300 speaker output

[Patrick]

We've a handful of people locally using OT1's and 2's with modified  
M120's through the accessory port.  It makes for an easy setup as once  
they're tuned (and we found that all needed to be despite being  
working pulls).

p

Quoting Scott Miller <scott at opentrac.org>:

> 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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