Batboard

Can a R1-UHF (403-435MHz) be tuned above 435 for 70cm HAM use?

Is it as simple as programming it and re-tuning it?

How high can it go?

I suppose an R2 unit would be better since I read it is spec'ed for 435-475MHz.

I've searched and read all posts here. Most of what I've read leads me to believe it is possible.

A simple order of the steps required would be greatly appreciated.

TIA

A Range 1 MSF or a Range 2 MSF can go to the 440 mhz amateur bands with proper programming, tuning and alignment.

Save yourself a lot of time and trouble and invest in a service manual if you plan on retuning the pre and post filters in the radio.

Follow the steps exactly as shown in the manual and you'll get the MSF tuned for many years of trouble free service.

You will also need a good service monitor to accomplish the retuning.

Thanks for the reply!

Looks like I've got everything I need to do the task.

Any other pointers/tips from others well versed in this task are welcome.

i think i disagree with andy.

you are probably not going to have acceptable performance in the ham bands (440+)...especially if your receive freq is at 447-449 Mhz.

you will have much better luck if you are able to coordinate a 430mhz pair.

i doubt the VCO's would lock up 10+Mhz out of band....but you will never know until you try.

roger with andy - get the manual and follow the re-tuning instructions STEP BY STEP.


one other thing to look at is the cable from the post filter going to the single antenna jack on the outside of the cabinet. you MUST ensure you have the right cable here for either a High In/Low Out or Low In/High Out repeater split - the cables are color coded and stamped with a part # - make sure you check the manual to ensure you have the right cable based upon your new freqs.

also - you will need a sig gen *AND* a service monitor with a spectrum analyzer/RF millivoltmeter to do the alignment.

doug