View Single Post
Old 11th Apr 2021, 3:03 pm   #3
Jon_G4MDC
Nonode
 
Jon_G4MDC's Avatar
 
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,013
Default Re: Trio 9R59DE alignment issue

The service manual alignment instructions are shockingly bad. It doesn't tell you which side of RF the LO should be.

You will need some means to measure the oscillator frequency (second receiver, frequency counter or maybe a DSP dongle). If you establish the highest and lowest frequencies the LO can reach on range D maybe you can decide which it is.

Definitely get the oscillator tuning right and the dial reading correct before trying to align the RF. It does warn that there is pulling between them. If they mention it then it has to be pretty bad!

Good luck. I had a 9R59DS and I think LO was on high side of RF. That's why 14MHz Amateur Band always contained sprogs from the 15MHz BC Band. The LO was between them and the BC was on the image frequency.
Jon_G4MDC is offline