Batboard

Hello

I recently got a UHF MTS2000 Model 1 (H01RDD9PW1BN) with the intent of using it on 440 mHz ham as well as GMRS. I'm having a lot of trouble with the radio breaking squelch in the presence of signal on any adjacent channel. The guy I bought the radio from programmed in a few test channels for me so I could evaluate the radio when I first got it, and it exhibited this problem then. The radio would break squelch in the presence of other RF sources, like putting within a few feet of my wireless router.

Looking over the programming details, the squelch fine tune had been set to '0' on all the conventional personalities, so I'd though I'd found the culprit then. However, adjusting the fine squelch up to the max of '31' in the CPS has not made much discernable difference. Adjusting it to about 15-20 keeps it from opening up when it's within a few feet of my router, etc, but the adjacent channel interference remains. None of my Saber's exhibit this problem. This is my first experience programming a Jedi series, so please bear with my newb-ness. Is the receiver out of alignment? How can I fix the selectivity? Thanks.

Someone else will jump in with better help, but for what it's worth, I have the same problem with ALL my radios when I set them on my desk next to the phone and computer monitor. This happens with MTS2000's, XTS2500's, XTS5000's and Waris radios. Only solution I've found is: set them down elsewhere if you're not using a PL/DPL code. With PL/DPL, they stay quiet until the proper RX PL/DPL code is detected, but the RX light flashes constantly.

The squelch fine tune really changes nothing useful, you have to go into the service menu and make the squelch changes from that screen.

If the service menu reorts a low value, and the radio is unmuted, then adjust the squelch value upwards until the noise disappears, then tweak it up a couple more points to make certain.

The adjusted values will not change until you exit the service menu, and the radio resets.

If you need to dig deeper, and the radio is still exhibiting noise even afdter the squelch adjustment, then you may have to cross reference the VCO crossover points that match your particular RF board.

Each board revision is different, and you can't simply pick one out of the blue.

You must also reset the receiver's VCO crossover point at the same time.
There are several other adjustments that can be made from the service menu, but be careful when making changes, in that what you adjust here can severely impact the overall radio performance.

If you know your radio's firmware version, that will tell you if ou can get away with using lab to make critical changes or not.

But the caveat here is standard: do NOT attempt using lab with ANY firmware version higher than R05.41....anything higher will brick the radio unless you are confident that you have the skills needed to undo what happened.

Just a friendly reminder.

Good luck returning the radio back to normal usage!

73

Ernest