[arm-allstar] rxnotch

[David McGough]

Patrick,

Yes, the rxnotch filter works on audio coming from any in-bound rxchannel, 
local or remote.

It would also be useful to try the simpleusb DCSfilter setting, if the
low-frequency noise is coming from a local receiver.  The DCSfilter is a
"brick wall" hi-pass filter which effectively stops noise from digital
coded squelch.

See this post where more details about current HamVoIP/simpleusb filters 
can be found:

http://lists.hamvoip.org/pipermail/arm-allstar/2018-May/008862.html


What kind of peak amplitude are you seeing? Do you have a Bode plot?


73, David KB4FXC



On Wed, 11 Dec 2019, "Patrick Perdue via ARM-allstar" wrote:

> I have noticed two prominent resonant peaks, mostly from cheap Chinese 
> radios -- Baofeng, PuXing, not so much from BTech and Wouxun,) as well 
> as everyone I've ever heard using a Clear Node. I guess it's something 
> about how their high pass filters work. These are generally 330 and 290 hz.
> 
> If I use a pair of cascaded filters in rpt.conf, such as
> 
> rxnotch=330,20,330,20,290,20,290,20
> 
> will this notch filter be sent down the network, or just to a radio 
> connected to the node? In other words, if someone who exhibits this 
> sound normally is connected through my node, will others also connected 
> to the same node get the notch filter applied to their RX?
> 
> Thanks and 73
> 
> de
> 
> KE4DYI
> 
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