[Milsurplus] LM freq meter calibration book accuracy

[J. Forster]

The 8601A is not a signal generator. It's a sweep generator for the 8405A
VNA It's virtue is sweeping, not single frequency generation.

A faired comparison would be to an 8640A.

-John

================

> My two cents-
> Turn the meter on wait 30 minutes.
> Slap a frequency counter near by and you will note that it rises and
> falls either side of the mark, setting <= ~100hz on the primary band,
> by observing the digital frequency counter; Yes is does drift up and
> down but the drift is slow, over a ~20 minute period.   This may be due
> to outside air getting into the unit through the phone jack, among other
> places.  That being said the settings are right on if the reference
> crystal is adjusted correctly.  I have two LM-13's and two BC221-AK's
>
> I compare this to my HP 8601A the drifts all over the place no mater how
> long I let it warm up. Setting on the desired frequency in the lower
> bands is a real challenge to say the least.
>
> Forgot, was it Clete,  who described wrapping the LM or BC221 unit in a
> heavy towel; that makes a lot of sense.  This would cut down on the air
> flow exchange with the outside air and limit any drift... I'm going to
> try this trick on my HP8601A  see if a heavy towel will quiet the
> drift.  Kind-a like a BBQ smoker.... an even temperature....
>
> Hutch
>
>
>
>
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