[App_rpt-users] app_rpt and Hamtronics Exciter

Loren Tedford lorentedford at gmail.com
Tue Jul 26 07:49:41 EDT 2016


Great to hear!!  Good job Ke2n

Loren Tedford (KC9ZHV)
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On Tue, Jul 26, 2016 at 6:47 AM, Ramesh Dhami (VA3UV) <Ramesh at va3uv.com>
wrote:

> 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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