[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.

Cheers!

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
>
>
>
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