Batboard

Have an MSR 2000 vhf 110 w repeater with split pl rx and tx of 97.4 and 151.4; problem we are having is when unkeyed the portables here squelch nois for about .5 secs then it goes away and have the normal repeter hang time which sounds fine but the .5 secs of squelch is very annoying any ideas how to get rid of this i might be able to get a wav file of what it sounds like any help will be appreciated

First thing to check - have you checked the PL enable switch on the station control module to verify that it's in the "PL ENABLE" position? With it off(to the left, if I remember correctly) the station receiver is carrier squelched, and it sounds like you're describing the squelch tail from the receiver and the rx is set up for very loose squelch and carrier squelched with rx PL disabled.

Sounds to me like REVERSE BURST was not enabled in the repeater's programming.

My HT600, P200 and MT1000 did the same thing you mentionned when reverse burst was not enabled like when using Non-Motorola portables.

Some have the option of AND/OR or AND/Std squelch in RSS.

The AND/OR setting will stop the loud squelch tail you are hearing.

If you are using portables other than those made by Motorola, you may have to look at the programming.

Wow, I guess its bedtime for me...

I hope my post made sense... Lets try this again:

Basically, all Motorola radios using PL (or CTCSS) will send a short reverse tone burst when you unkey. This is done to tell the receiver you're done transmitting and mute the squelch immediately.

When using other brands of radios, or radios that aren't set up for reverse burst, you will get a loud squelch tail when they stop transmitting.

I'm not familiar with the RSS for the MSR2000 but there must be an option for REVERSE BURST and that should solve the problem. If thats not an option, and you are using newer portables (such as GP300, GP350 for example) you have an option in the RSS for AND/OR or AND/Std squelch in the RSS and setting this to AND/OR will resolve the problem.

Hope this helps

The "RSS" for the MSR2000 is the "Regular Soldering System"

If this is a ham application - some of those radios may not transmit reverse burst - resulting in a squelch crash on dekey. You could add an audio delay module in the repeat audio path to cure that.

Otherwise get out your soldering iron and 'program' the audio squelch module for "AND" squelch operation. [JU104 OUT and JU105 IN]

OKay The pl Switch is not on all radios in the system are motorola mostly ht1000 and cdm 1550ls+ and does this on all radios so is it in the repeater or the mobile /handheld units that is causing the problem


ALSO XMO where can i find JU104 and Ju105 to check them are they on the squelch card or the backplane of the card cage

Otherwise get out your soldering iron and 'program' the audio squelch module for "AND" squelch operation. [JU104 OUT and JU105 IN]

Tried programming the portables to and that made no affect it is like the repeater needs to be sending reverse Burst but isn't any ideas

In your initial post you indicated that the squelch crash is being heard first - then the noise goes away and you have the normal hang time. That tells you that the problem is NOT the repeater reverse burst.

One possibility is the squelch control setting. The MSR has two squelch settings. The one on the audio squelch module sets the audio squelch. The other - on the squelch gate card sets the point where the repeater keys and drops out.

The one on the audio squelch could be wide open and if the one on the squelch gate is set properly - the repeater will work normally - except that you will get a squelch crash on every incoming trasnmission - if the jumpers on the audio squelch card are set for 'OR' squelch.

Hook a test set onto the receiver, verify proper setting of the squelch control and your problem may be resolved.

The squelch is set fine as far as I can tell and haven't had any luck finding the jumpers ju104 and ju105 and yes the squelch burst is heard then the normal kerchunk on the msr2000 dopout

I think XMO is right on! I had the same problem on my vhf MSR, and it ended up being the audio squelch was wide open. It was a result of me thinking I knew what I was doing, and not going by the manual.

If you want to check your "and" "or" jumpers (JU105 & JU104), they are
on the R1 Audio & Squelch module (board number TRN5068A or 69A, depending on which one you have). Looking at the component side, JU105 is next to the back plane plug, in the middle. JU104 is close to JU105, but
an inch or two closer to center of board. I'm looking at the printed circuit board detail in the manual, so I'm guessing at distances. The repeater is at the site, so I cannot look at the actual board.

Good luck,

Gary

Okay i will try those jumpers and the audio squelch setting this afternoon when i am the repeater and let you know if that fixes the problem thanks for all the replies

I am curious how your jumpers turned out and if that fixed your problem.

Big BOB

There is also a few changes we made on our audio/squelch boards that eliminated the 'crash' from all x brand radios regaurdless if they had a so called reverse tone or not. You really have to try to get one of my MSR2000's to 'crash' .
There are also some changes on the PL Encoder also.

I noticed cpq2700 didnt answer you, he's left on a cruise. Yes, for the most part the clipping he did of those "whatevers" on the PL card did the trick. Every once in a while, we still get a hint of static, but i think thats on that adjustment on the front of the pl card. a hit of wd40 probably would cure that, the control was a bit flaky.

just wanted to let everyone know.

bad part is sporadically this unit stops transmitting, the power went out the day he left I had to go up there and all i did was unplug and plug the unit back up and it worked again. i think its having trouble keeping the 9.4 volt parts going to fire the amp(?) if that is helping anyone technically out. he put a meter on the sixteen pin thing over on the back side when you lean the guts out and it wasnt getting the 13.8 or the 9.4 and with a bit of wire wiggling got it back. its been blowing a zenier(?) diode previously on a board at the bottom of the power supply, and i think we have that straightened out now, but its still what i consider to be somewhat unreliable. all it took was a second of interrupted power and it stopped working. but when it works it does quite well, and thats better than some of us.

dpg