[arm-allstar] FT-2900R COS Signal

[Doug Crompton]

I highly recommend NOT using a audio squelch circuit like this. It
ultimately causes trouble especially if you are connected to a hub with
many other nodes. It is not tolerant of noise and because it requires
keying and unkeying delays it works poorly. The radio you specify does not
have an external COS. It would be much better to find a radio that is more
"interfaceable" Depending on what you want to do the Baofeng 888 has been
used a great deal for personal local nodes. It does require modification
and details are on the hamvoip.org web page. If you are unwilling to take
that on there is a source of modified 888's. If you are interested drop me
a private email. Also any of the Alinco DRx35 series radios are easily
interface through a rear panel DB9. There are many other radios that will
work. Any radio with a 6 pin din or DB9 is usually easily interfaced.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*



On Wed, Jun 28, 2017 at 10:35 PM, "Jim Kinter Jr. via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> If you cant get to the COS signal (many newer radios its inside the chip
> with no pin), you could try this:
> https://www.youtube.com/watch?v=QopvHGM-9_k
>
> It detects output (when radio unsquelches) on the ext spk line and
> triggers the transistor to ground the PTT/trigger a relay.
>
> I will be using this circuit when I tie 2 FT-2800's together with a URI
> to make a VHF repeater.
>
> 73
> Jim
>
>
> At 04:02 PM 6/28/2017, \"derrick keating via arm-allstar\" wrote:
>
>> Hey just wondering I would need to interface my ft2900 to allstar thanks
>>
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>
>
> 73
> Jim Kinter, Jr. K5KTF
> Cedar Park TX
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