Marconi 2382 spurious response

[Andrew Holme]

My Marconi 2382 spectrum analyzer has a spurious response at 94.8 MHz, which
suggests the 1st LO is getting into the 2nd mixer. It's about 20 dB above
the noise floor at RBW 1 KHz, independent of input attenuation. Has anyone
else seen this problem on a 2382?

The vital statistics are:
1st IF = 502.6 MHz
2nd IF = 47.4 MHz
1st LO = 597.4 MHz (for f = 94.8 MHz)
2nd LO = 550 MHz (fixed)

 

[Jorgen Lund-Nielsen]

Andrew Holme wrote:

My Marconi 2382 spectrum analyzer has a spurious response at 94.8 MHz, which
suggests the 1st LO is getting into the 2nd mixer. It's about 20 dB above
the noise floor at RBW 1 KHz, independent of input attenuation. Has anyone
else seen this problem on a 2382?

The vital statistics are:
1st IF = 502.6 MHz
2nd IF = 47.4 MHz
1st LO = 597.4 MHz (for f = 94.8 MHz)
2nd LO = 550 MHz (fixed)

Hello,

there is a yahoo group for marconi instrument users,
maybe they could help.

http://groups.yahoo.com/group/marconi_test_instruments/

Regards

Jorgen