CDM1550 UHF frequency calibration

[mdbrown99]

I need to calibrate the receive and transmit frequency of a couple of CDM1550 radios. I've used CPS many times, but am new to the Global Tuner software. I'm an amateur....not a pro.

Which part of the Global Tuner software do I use to calibrate the frequency?

 

[mikewazowski]

Is there a Reference Oscillator adjustment?

 

[mdbrown99]

Thanks Mike, that's what I was looking for. I wasn't putting the two things together. For some reason, when looking through this last night I wasn't thinking that's what I needed. After your post my Google-foo kicked in and I found the service manual that I was looking for.

http://www.novacommunications.com/images/productpdfs/CDM Series Basic Service Manual.pdf

 

[cabletech]

First off, do you have a service monitor? If you do not, then you DO NOT want to attempt do to ANY service adjustments to ANY RADIO.

You would be better off and money ahead to take it to a shop.

NOW, if you do have monitor and you know how to use it, then the first thing you need to do is open the service software and under file read the radio.

Then, under tx align is when you find the adjustments.

AGAIN I stress if you do not have a monitor and or the back ground DO NOT ATTEMPT THIS.

 

[mdbrown99]

Thanks for the warning...I do have the equipment, just haven't done one of these radios before. They are a hell of a step up from the tweaking and turning for the Kenwood TKR-820s.

 

[PACNWDude]

CDM1550 alignments.

One other thing with many of the CDM1550 and 1250's make sure you have the radio on for a few hours to stabilize before the alignment. Probably stating the obvious since you already have test equipment.

I have seen people bring cold radios that have only been powered on a few minutes, align their radio, and find it out of alignment after it has been powered on for a few hours.

My last job had many technicians that thought a Motorola radio only needed a minute to be stable. I was able to show them several 1250 and my personal 1550's that would drift a bit after warming up.

Good luck and great radio you have there.