[Boatanchors] RME 69 Crystal Filter and Cc/C adjust

Bill Carns wcarns at austin.rr.com
Sun Apr 14 10:58:42 EDT 2013


I am doing my first alignment of a RME 69 receiver.

I am having trouble reading the schematic in the area of the crystal filter
but there is apparently some confusing info.

There is not much in the manual about the switch positions for the filter
selector switch. In the alignment section it refers to the middle position
of the switch as the "Series" mode position.....fine.

That implies that there is a "Parallel" mode position...  ???  Maybe.

There appear to be three positions of the switch..   10:00, 12:00 (Series)
and 2:00.   But, in the schematic there appear to be only two positions and
it is not clear what the wiring is in each position, or which position it is
shown in..

I want to understand this guy before I leap in. 

Also, anyone out there have any words of wisdom for setting the C and C(c)
capacitors that appear to be a "factory Setting on Band one, but "Should be
kept to an absolute minimum, so as not to degrade the upper bands.


75 years later, I am not sure I trust the "factory" settings for C and Cc,
which could have shifted or been messed with along the way.

  Any   ....  HELP !  is appreciated.

Bill
N7OTQ



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