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HP8590L A11/A13 adjustments R31 for  crystal amplitude

Question asked by Sputnik on Jul 27, 2018

I went thru the procedure to adjust the bandwidth filters and everything went fine except I was unable to get a proper signal doing the crystal amp. alignment.

Both R31 resistor on the A11 and A13 board didnt help it.

I was unable to measure the 21.4 Mhz IF frequency (which I tried by taking the board out and measuring the input on the connector).

I also noticed, that I have a problem with a SPAN below 100khz, above 100khz its OK (no problem at <>10Mhz).

 

 

????higher 100khzlower 100khz

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