[App_rpt-users] Hissing noise

[Benjamin Naber]

Does the hissing noise come from *any/all* remote nodes you connect to
or get connected from? Try nodes that you have previously never
connected to remove any potential bias.

Disconnect the radios and connect a communication quality speaker to
the audio out of the URI. You may have to simpleusb-tune-menu to get
the audio to a volume you can hear, but do not overdrive! Do this to
see if the noise you hear is indeed coming from the internet.


The next thing I would do is use zoiper or the public access number,
763-230-0000, and connect to *your* node number. Then connect to other
active nodes using the same star commands, and listen very closely to
the audio. This will be a baseline (in this case, a *rough* baseline).
Your connection to the ASL public SIP or telephone portal should be NOT
taken as a pure standard, as the codec for SIP or PSTN phone may not be
ulaw/related, which you can change the SIP codec. More grains of salt
added, the speakers on any phone/tablet tend to not be as good as full
size speakers in a quality radio.

Given that all of the nodes systems I have built, the large count of
dialing into ASL or my nodes, never has a hissing noise, or anything
else that would be considered objectionable, has ever been heard.

..... Post your results, be as specific and organized in you writings
as possible.

~Benjamin, KB9LFZ



On Fri, 2017-12-08 at 22:44 -0800, Alejandro Pereida wrote:
> Hello all:
> 
> I just finished building a 900 MHz repeater using a pair of TK-941
> radios, I’m using a DMK URi and a Pi3 with the latest version of
> asterisk
> when using locally the repeater the audio ie very good, but most of
> the audio coming from internet linked connections come in with a
> strong constant hissss noise, in some cases the noise can be weaker
> or stronger than others but only happend to audio coming into the
> repeater from the internet.
> 
> Any ideas what this may be?
> 
> Thanks
> 
> N2IX
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