External squelch control for Motorola radios

The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!

Moderator: Queue Moderator

External squelch control for Motorola radios

Postby kilowna » Fri Dec 12, 2003 12:28 pm

Does anybody have any information on an external squelch control for Motorola M1225, CDM750 models? I used to be able to do this with Vertex way back when they stopped using external squelch. Does anybody know why external squelch pots are not used? :cry:
Posts: 1
Joined: Fri Dec 12, 2003 12:21 pm

Postby KG6EAQ » Fri Dec 12, 2003 12:44 pm

The operators.
-Robert F.
User avatar
Batboard $upporter
Posts: 1862
Joined: Mon Jan 14, 2002 4:00 pm

Postby CTAMontrose » Fri Dec 12, 2003 1:33 pm

KG6EAQ wrote:The operators.

hahaha that has to qualify as the answer of the day

Its funny, because its true.
was grem467
Posts: 1145
Joined: Mon Jul 21, 2003 12:46 pm
Location: 20 Warnings for inhibiting peoples bootleg trunked radios.

External squelch control...

Postby Tom in D.C. » Fri Dec 12, 2003 2:24 pm

I own an old MT500 which was once owned and used by an airline and it's an omni with no external squelch, though the pot can be found and adjusted inside the radio.

Absolutely no reason for doing this except to keep the help from messing with the squelch setting, IMHO.
Tom in D.C.
In 1920, the U.S. Post Office Department ruled
that children may not be sent by parcel post.
User avatar
Tom in D.C.
Posts: 3857
Joined: Tue Sep 04, 2001 4:00 pm
Location: D.C. and the Blue Ridge Mountains of Virginia
What radios do you own?: Progreso soup can with CRT

Postby ExKa|iBuR » Fri Dec 12, 2003 4:11 pm

There's not really any reason to need to adjust the squelch...

As the saying goes with that Ronco grill "Just set it...and forget it!"

User avatar
Suspended TFN
Posts: 1157
Joined: Thu Jun 06, 2002 8:53 am
Location: Toronto, Ontario, Canada

Postby Nand » Fri Dec 12, 2003 5:39 pm

The function of the squelch in a VHF or UHF radio is to kill mostly its own internally generated noise when no RX signal is present. This is the noise you hear when no antenna is connected and the squelch is open. In older radios this noise was less constant because of temperature and voltage variations in both the RF circuits and the squelch circuit itself. The front panel squelch control allowed compensating for these variations.

Modern radios are far less sensitive to these variations and consequently do not need an external squelch control any longer. Models like the CDM, M1225, P1225 and the Warris series do have an optional setting in the RSS that allows a button to be programmed for tight or loose squelch if needed to eliminate light interference when only carrier squelch without PL is used.

Posts: 1690
Joined: Wed Oct 31, 2001 4:00 pm

Return to General Motorola Radio Discussion

Who is online

Users browsing this forum: Bing [Bot], Google [Bot], Yahoo [Bot] and 4 guests