Hi Richard

I was surprised that the sensor line was so long and so

On the order of 1.5 cM?

It is a "U shape". The section parallel to the output stripline is maybe
1cm long (going from memory). The leg length may then put the total size
at more like 2cm.

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I am thinking also that the 50 ohm output is not being preserved as it
goes past the sensor stripline.

What does that mean?

I am suggesting that given the proximity of the sensor section it
presents a significant Z bump. Like I said I dont have a feeling for the
track dimensions for stripline etc at microwave. Not that it wouldnt be
difficult to look it up mind you!

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I think the freq coverage for this model
is about 10.5 to 11.5GHz. Keep in mind that this really is the frist
time I have seen microwave TX's up close so my gut feelings about track
sizes/spacing may be way off.


Check the resistor.

One of the first things done. At DC of course. Dont think I ever
replaced it. Was considering playing with it last time but since moving
the frequency also bought it back to normal operating conditon I couldnt
see it as a reason.

Cheers Bob VK2YQA