[App_rpt-users] RTCM PTT circuit

[Sam Nabkey]

I totally agree...  I had a Hamtronics 220 repeater and I did exactly
that...

After the audio mods it sounded really nice.

Sam.
On Mar 8, 2014 11:43 AM, "Robert A. Poff WB3AWJ" <wb3awj at comcast.net> wrote:

>
> I would think that it should switch 100ma with no problem.
> Make sure you put a diode across the relay coil (band toward + volts) to
> suppress back emf when the relay releases.
>
> As to the Hamtronics exciter....
>
> I had to use one (TA451) on a local club UHF repeater that I redid as an
> Allstar node. That repeater always had sounded horrible before.
> And to no surprise, with the Allstar node it sounded absolutely RANCID. I
> needed to bypass all the mic processing and the really nasty clipper,
> and inject the transmitter audio downstream just after the splatter
> filter, and essentially directly into the phase modulator. Through an
> isolation
> resistor (somewhere around 4.7K if I remember correctly).
>
> Now it sounds as smooth as my Mastr II / Allstar repeaters do.
>
> ------------------------------
> *From: *"Bryan Fields" <Bryan at bryanfields.net>
> *To: *"app rpt-users" <app_rpt-users at ohnosec.org>
> *Sent: *Friday, March 7, 2014 5:44:12 PM
> *Subject: *[App_rpt-users] RTCM PTT circuit
>
> I'm interfacing the RTCM with a hamtronics exciter and will be using a
> small
> relay to key it.
>
> Can it sink 100 ma to ground for the relay or do I need a driver
> transistor?
>
> --
> Bryan Fields
>
> 727-409-1194 - Voice
> 727-214-2508 - Fax
> http://bryanfields.net
>
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