I think you will find that shouting into the mic will talk
off the CTCSS. The last new radio I tested had 5.8-5.9
KHz dev fresh out of the box. My standard test is to
yell a "FOUUUUUUUUUR" into the mic with my lips
just a 1/4 inch off the mic grille.
And it's instinctive for the people in a vehicle to speak up
when traffic noises are loud, especially when the window(s)
are open. A bench test on a brand new radio HAS to
include yelling into the mic.
Mike
At 02:51 PM 07/06/09, you wrote:
Thanks .These maxons pm160 are straight from the makers and the
deviation hasn't been touched but I will check this radio on our
service monitor and see how it goes.
Thank You,
Ian Wells,
Kerinvale Comaudio,
361 Camboon Road.Biloela.4715
Phone 0749922574 or 0409159932
<http://www.kerinvalecomaudio.com.au/>www.kerinvalecomaudio.com.au
-------Original Message-------
From: <mailto:[email protected]>Kris Kirby
Date: 7/07/2009 07:40:08
To: <mailto:[email protected]>[email protected]
Subject: Re: [Repeater-Builder] Ctcss dropout due to loud voice
On Tue, 7 Jul 2009, kerinvale wrote:
> Hi guys .Can anyone suggest ways to reduce ctcss dropout when someone
> is talking loud on a repeater .The repeater radios are maxon pm150
> (sm4450sc) and I have tuned them using 600hz of ctcss and a 1khz tone
> at 3khz modulation to make sure it doesn't happen ,but I have one user
> that talks louder than the other users and it seems to breakup all the
> time for them where other users seem to have no problems.Could I make
> sure their ctcss from their maxon pm160 is around 600hz or 700hz or
> could the problem be more tied up with the receiving repeater radio
Your user is over-deviating. Reduce the deviation in his radio, or tell
him not to yell into the mic. The dropout is because his signal is
passing outside of the receiver's bandpass.
--
Kris Kirby, KE4AHR
Disinformation Analyst
