[App_rpt-users] A and B audio output from USB fob on a RPi running DIAL

Loren Tedford lorentedford at gmail.com
Mon Jul 11 16:14:58 EDT 2016


Just curious what pl tone are you using?? I have heard some stories where
pl tones where just a little too hot creating some thing similar to what
you describe i personally have not yet seen this but It might be something
to consider..

Loren Tedford (KC9ZHV)
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On Mon, Jul 11, 2016 at 3:08 PM, Ramesh Dhami (VA3UV) <Ramesh at va3uv.com>
wrote:

> On 7/10/2016 4:08 PM, Kevin Custer wrote:
>
>> Running 3 nodes on the DIAL release is likely not going to work.  You may
>> want to try Doug and David's release which uses a different channel
>> driver.  I've never heard anyone having luck running more then 2 nodes on
>> the Raspberry Pi release in full DSP, but I have heard of success with the
>> other.
>>
>>
> Hi Kevin and all:
>
> Wow - lots of discussion going on today, so I will jump in help divert the
> discussion!
>
> So... for one of my 220 repeaters, I did confirm that the USB fob I was
> using was one of my earlier versions, which only had one audio output -
> hence the reason why I was not able to get the 'split' PL working - doh! -
> my bad ;).
>
> My 2nd 220 repeater (yeh, I have 2 x 220 machines that I am lucky enough
> to be working on at the same time!) - this is a pair of Bridgecom BCM220
> mobiles (identical to the radios used in the Bridgecom 220 repeater
> package) - this repeater is connected to a fob where I did bring out both
> audio channels.  So hence, I am able to split the PL and inject that into
> the 'data' input of the BCM220 radio.  This works well - so all good there!
>
> What I am observing is that I have some high frequency noise on the audio
> out of the Bridgecom TX radio; it's subtle, but it is there.  One thought
> that I had is whether this was coming off discriminator of the RX radio.  I
> turned the RX radio off and the noise is still there.  Now coincidentally,
> I saw a message scroll by the display on the TX radio "PLL UNLOCKED" - ta
> da... is this synthesizer whine that I am hearing??? - I am going to test
> with a local mic tonight and see if the noise is still there (independent
> of the USB fob / app_rpt, etc...).
>
> Running 3 full-duplex nodes on the Pi - I've been doing that for sometime;
> the difference now is the radio's - the RPi 2 and fobs are the same.  I
> didn't have this issue before.
>
> More to follow... but for now, I wanted to provide an update and get us
> back to a technical discussion! ;).
>
> Cheers,
>
> Ramesh.
>
>
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