[App_rpt-users] Squelch issue with RTCM and Kenwood

Lee Woldanski ve7fet at tparc.org
Mon May 1 12:28:04 EDT 2017

Hi James,

Chuck Henderson, WB9UUS, made a couple modifications to the code... one I
believe actually fixes a bug in how the RSSI is calculated (which is
probably your issue), and the other changes squelch action.

A previous thread here:


If you look in the source code, you can find the specific changes:


The predominant issue here was even if the received signal was
full-quieting, if it was a short transmission, it could cause a long
squelch tail.

As for how the RSSI is calculated... if you look at the RSSI in Allmon,
without this patch, you'll see the RSSI level jumping all over the place,
especially on noisier signals. With the patch, things are much more stable.

Firmware images with and without the patch enabled are available on the
repository for you to try out. They should be there for all hardware


If you are using a MicroNode RTCM, you will likely want the "SMT V1.5
Chuck" file.


On Mon, May 1, 2017 at 8:18 AM, James Cizek <james.m.cizek at gmail.com> wrote:

> Firmware version 1.50
> I guess I am not familiar with a "Chuck squelch patch" so am guessing that
> I am not running it!  Can you help point me to information?
> Thanks!
> James
> Date: Mon, 1 May 2017 08:11:40 -0700
> From: Lee Woldanski <ve7fet at tparc.org>
> To: Users of Asterisk app_rpt <app_rpt-users at lists.allstarlink.org>
> Subject: Re: [App_rpt-users] Squelch issue with RTCM and Kenwood
> Message-ID:
>         <CACaEaZ=oKYbY16wAZQeGTNieQ-kGAGQs=zHyGemPMjUAt3hSKg at mail.gm
> ail.com>
> Content-Type: text/plain; charset="utf-8"
> Hi James,
> What firmware are you running in the RTCM's? And are you running firmware
> with the "Chuck Squelch" patch enabled?
> Lee
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Lee Woldanski, AScT
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