[App_rpt-users] app_rpt and Hamtronics Exciter

Ramesh Dhami (VA3UV) Ramesh at va3uv.com
Tue Jul 26 07:47:28 EDT 2016

Hi All:

An update to my own post ;)

I moved the audio from E2 (AF Input) to E5 (modulator input) and made 
the appropriate changes in the usbradio config file.  The audio out of 
the repeater sounds a whole bunch better ... night and day difference!!

No need for a series resistor, since the T302 exciter schematic shows a 
10K resistor in series with the E5 pad.

Thanks to Ken, KE2N, for confirming this off-list.


Ramesh, VA3UV

On 7/25/2016 1:23 PM, Ramesh Dhami (VA3UV) wrote:
> Hi Guys:
> Working on the 2nd 220 repeater project.  I have been feeding audio 
> out of my fob into the 'E2 - AF Input' pin of a newer T302 (220MHz) 
> exciter.  This exciter is replacing the former T301 exciter.
> My issue is that the limiter on the exciter seems to be 'a little 
> suspect' - I can set it to ~ 4.8k one day; set my TX levels and then 
> the next day, I find that the limiter seems to have drifted off up to 
> around 6k or even higher!
> I have been using the E2 input for audio and E5 (modulator input) for 
> PL tone.  I am planning on moving the audio input to E5, so 
> essentially feeding E5 with composite voice and PL.  I did a quick 
> search of the mailing list to see what others were doing.  I was able 
> to find three posts (from Bryan Fields, Robert Poff and Sam Nabkey) 
> referring to an "audio mod".  Is the "mod" just as I describe it 
> above, or something more than that?
> I see reference to a series resistor of 4.7K, so presumably this is 
> inline with the composite audio / PL output when injecting into the 
> modulator input?
> Cheers,
> Ramesh, VA3UV
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users at ohnosec.org
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
> To unsubscribe from this list please visit 
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll 
> down to the bottom of the page. Enter your email address and press the 
> "Unsubscribe or edit options button"
> You do not need a password to unsubscribe, you can do it via email 
> confirmation. If you have trouble unsubscribing, please send a message 
> to the list detailing the problem. 

More information about the App_rpt-users mailing list