Bob, my impression (I did not make any measurements) was that the short squelch
tail did not change any with the mod. I had a mixture of base station and
mobile squelch modules in my base station repeaters, and the biggest problem I
had was with the base station modules. One of the capacitors was completely
missing in those modules (as pointed out in the mod instructions). Those
modules with the missing capacitor were the ones with the worse problem when a
noisy signal was dropping out intermittently with the multipath.
My impression of the tail with a very weak signal was that the squelch stays
open for about 200 msec when the signal goes away. I tried both the 3.3 uF and
the 4.7 uF caps and could not tell much difference. Both worked out just fine.
I did find several different layouts for the boards and had to verify the LSI
chip part number and then trace the leads from the right pin back to the
correct capacitor. But all responded OK to the capacitor when modified.
73 - Jim W5ZIT
--- On Wed, 12/24/08, n...@no6b.com <n...@no6b.com> wrote:
From: n...@no6b.com <n...@no6b.com>
Subject: Re: [Repeater-Builder] NHRC-Squelch Board
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, December 24, 2008, 12:46 AM
At 12/23/2008 09:09, you wrote:
>For the GE Mastr II users following this thread, be sure to check the mod
>shown here:
>
>http://www.repeater -builder. com/ge/mastrIIsq uelchmod. html
>
>I have this mod in all the repeaters I have built and am very pleased with
>the operation. It resembles the dual squelch operation of the Micor in
>that it closes very fast with barely a click on a fully quieted signal,
>yet does not close during a mobile transmission that is picket fencing. I
>have not needed to use an audio delay module to have a very good sounding
>repeater with no long open squelch bursts.
Any idea as to how much the short squelch tail is lengthened by this
mod? Without the mod the G.E's short squelch is a bit longer than the
Micor (~6 milliseconds for the Mastr II vs. ~2 for the Micor)
Bob NO6B
,_._,___
