[R-390] Need 390 help

Bob Young youngbob53 at msn.com
Wed Oct 10 21:36:26 EDT 2007


I'm in the process of attempting to aligning a 390. I'm now in the fourth 
echelon, alignment section, #77 e. on page 94 for Alignment of the Second 
Crystal Oscillator. I have my VTVM set for negative voltage between E209 and 
ground with a CW signal from my URM-25F going between ground and E210. I can 
peak slug T402 but the problem is is that trimmer 31 does nothing at all 
when it is turned. In fact I am reading the PTO on my frequency generator 
which is hooked up to the URM-25F. It appears that I am getting nothing from 
the signal generator into the radio at all and it works fine, all I am 
reading is the PTO output. I have the receiver on standby as it says. I have 
to be doing something wrong but I can't figure it out. The frequency dial is 
set at 31 also. Could this be a bad crystal?

I just found a great way to read your PTO's frequency output though, hi! 
Mine was 3 kc off at 500 so I moved it the 3 kilocycles, this was after I 
encountered this problem.
Up to this point everything went fine although parts of it were a PITA, by 
the way I'll see everyone at the NEAR-fest Friday rain or shine, don't want 
to miss the R 390A class, this is a R390/URR BTW not a R390A/URR,

Bob
KB1OKL




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