[Premium-Rx] Relcom mixer, follow-up

[Robert Nickels]

Thanks to the help of list members I was able to get my undocumented ACL 
HF receiver working just fine again.  Full disclosure: while I was 
convinced the DBM at the front end was defective, it turns out I was 
mistaken, and the problem was weak LO injection.  I thought I'd 
eliminated that possibility but the ACL has separate buffered outputs to 
drive the mixer and the frequency counter, and apparently I let that 
confuse me.  Weak injection voltage was leaking through a bad transistor 
which allowed the receiver to work - but with very poor sensitivity.   
So, I learned that LO injection level is pretty important and to always 
measure, not just assume it's OK    I can now hear 0.5uv signals and 
have learned my way around this "mystery set".  The most time-consuming 
part of the fix was tearing the chassis apart enough so I could probe 
the RF module while it was in operation.   Modularity is nice, but 
having a proper extender card is even nicer!

Has WJ or anyone ever heard of a similar follow-on design from WJ or any 
successor company - with a 65 mhz first IF followed by 455 khz second IF 
using Collins mechanical filters?

73 and thanks again for the help,

Bob W9RAN