I would be curious to know what level you run the tx output at ?
I put an extra pot inside my exciter, at the audio input, so that I could run the txmixer (or whatever it is called) at around 500 - half of full scale.
I had a noise problem on the CTCSS input of the Hantronics, as well, when I added the separate PL signal later on.
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That is because the Hamtronics CTCSS input is very low level and high impedance. In that case, I just put a 47 ohm resistor at the exciter input. The URI has no trouble driving into this low-Z and it killed that particular noise.
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I get one more noise that I cannot figure out though … at the end of a users transmission there is kind of a low-pitched “glug-glug” noise before the courtesy beep - seems like some sort of artifact similar to a previous version that would not play disconnect messages - but would still make some sort of noise…
I guess I should mention that I am using discriminator audio and
DSP squelch.
I get one more noise that I cannot figure out though … at
the end of a users transmission there is kind of a low-pitched
“glug-glug” noise before the courtesy beep - seems like some sort of
artifact similar to a previous version that would not play disconnect messages
Is this on a full duplex repeater? I wonder if the Transmitter is getting in to the Receiver, you should be able to see that if you can monitor the receiver while you make the transmitter transmit while there is no one using the repeater.
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On Tue, 4 May 2010, Ken wrote:
I guess I should mention that I am using discriminator audio and DSP
squelch.
I get one more noise that I cannot figure out though ... at the end of a
users transmission there is kind of a low-pitched "glug-glug" noise before
the courtesy beep - seems like some sort of artifact similar to a previous
version that would not play disconnect messages - but would still make some
sort of noise...