On 04/10/11 15:31, paul swed wrote:
Magnus
But does anyone have comments on the meter approach HP suggested.
I really need to understand whats semi normal for old tube.
I suspect I may be sitting near the noise floor of the system.
As for the network analyzer I just happen to have a HP 8505 so may give this
a try. Suspect I will see the fingers but very close to the noise floor.
The main point of that measurement is to let you better see what
happends. Remember that sweep-rate greatly impact S/N.
I had a cesium with a DDS which had failed. This added S/N to the
receive signal.
Cheers,
Magnus
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