[Test-Equipment] HP 141 analyzer low gain

Fri, 27 Feb 2004 21:20:54 -0800

Usually due to poorly-mating coax jacks in the D-connectors between the RF
and IF plugins.  We're talking 9 times out of 10 here. :)

Bend the fingers toward each other and/or add an extra washer or two to help
the connectors mate, and you will probably be good for another 30 years.

-- jm

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Gary Schafer
> Sent: Friday, February 27, 2004 8:09 PM
> To: test equipment
> Subject: [Test-Equipment] HP 141 analyzer low gain
>
>
> I finally got around to doing a little work on my old HP 141 spectrum
> analyzer. Had to repair the input attenuater. Someone had smoked the 10
> db front end pad. Replaced resistors and works ok now.
>
> The analyzer has low overall gain. Down about 20 db. If I turn the gain
> adjustment up all the way (front panel screw driver adjustment) I can
> get the gain up to about -10 db down. But it is not linear there. When
> changing the step attenuaters the crt does not indicate 10 db each time.
>
> With the gain calibration backed off to where the analyzer is 20 db
> below where it should be calibrated everything seems to work fine except
> of course the calibration is off by 20 db.
>
> Any thoughts on where to look for the problem?
>
> Thanks
> Gary  K4FMX
>
>
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