P50 squelch

jim · Post by **jim** » Mon Mar 25, 2002 7:22 pm

Okay, this has to be a common problem. I just picked up two P50 lowbanders and both of them have a squelch that will barely close. Is there a "coarse" adjustment for this?

kens · Post by **kens** » Mon Mar 25, 2002 11:31 pm

I have several P50's in uhf and the squelch pot is intermittent on all of them. I had some luck putting a drop of cleaner into the pot. Otherwise, you may need to change the pot.

Dave · Post by **Dave** » Tue Mar 26, 2002 7:46 am

these radios are sensitive to external noise from computers etc. Just for a test, remove the antenna and see if the squelch is better. If not, the radio could have a problem.

RadioSouth · Post by **RadioSouth** » Tue Mar 26, 2002 9:27 am

I've got the same problem with a P-10 (same squelch pot as p50) squelch won't close at all. I put in a PL board to eliminate this problem .Must be a common issue with radios of this type.

RadioSouth · Post by **RadioSouth** » Tue Mar 26, 2002 9:31 am

Just got an idea for you- if DPL is acceptable for your application a guy has been advertizing DPL boards on and off on EBay and the newsgroups [email protected] ?
Might be the cheapest way to fix the problem.

jim · Post by **jim** » Tue Mar 26, 2002 12:21 pm

This is an actual problem with the radio. Even with the antenna off, it does this. It's almost like the pot is bad. I didn't get into the radio yet, so I'll let all know what I find.

Monty · Post by **Monty** » Tue Mar 26, 2002 12:44 pm

Hi:

As some may or may not know, Motorola thought
it would be a great idea to use a " Flex"
strip instead of wires for the squelch pot
in the P50's , ect...

Well, it did not work all that well !

If the Pot should become loose, it will break
the Flex strip all the time ! Its wise to
replace the Flex Strip with 5 small wires as was used in the original series.

Also,manytimes these Pots get replaced with a substandered Value, and you may not be aware of it. Best to use a Factory Original

The value for the Sq Pot is 25K, I have sometimes used a 50K replacement and that works very well

Hate to admit it, but I have worked on 100;s
of P10's, P50's and the like.

Monty

Motoroly · Post by **Motoroly** » Wed Mar 27, 2002 6:00 pm

I totally agree with Monty! Those flex cables were a Beach! Every one I see, that will not squelch, I do one of 2 things. Most of the time I replace the flex, as Monty said, with hardwires, or in some cases, I've seen where the gain of the rx circuit was so high that all you would get at times is open squelch. If Monty's fix doesn't do it, let me know and I may have one. All you do is change the gain on a transistor on the frontend, with a larger resistor, I believe, to decrease the gain. The open squelch is very noticeable with units with no pl.