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@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@bryanfields.net> *To: *"app rpt-users" <app_rpt-users@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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