[Repeater-Builder] Cushman CE-15 Spectrum analyzer

2008-04-06 Thread David Murman 
I have a Cushman CE-15 spectrum analyzer that was about 30 to 40 dB low in
measuring signals. Traced the problem to the 2.1 Ghz bandpass filter. Looks
like someone broke off the loop going to one of the connectors. 

 

Anyone on this group have one they are parting out and can PART with the 2.1
Ghz bandpass filter part number 2600?

 

 

 

Thanks;

David

[Repeater-Builder] Cushman CE-15 Spectrum Analyzer

2007-08-28 Thread David murman 
I have a Cushman CE-15 Spectrum Analyzer that was working and recently 
I noticed signals very weak. When measured they are 30dB down. I have 
checked the Diodes in the RF attenuator and they check good. I noticed 
the schematic I got off the repeater builders WEB page that the ref 
level switch does not correspond to what I measure on the 4 lines going 
to the RF attenuator. The Cushman I have is black in color on the face.
The switch going to the IF switchable gain and BW check out ok.

Any idea where else to look for the 30dB loss? Anyone have a good 
schematic on this spectrum analyzer? I am borrowing another spectrum 
analyzer to look closer at the RF attenuator to see if the diodes are 
leaky.  No RF was transmitted into the Cushman.


Thanks;
David
WA4ECM