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As they were needed for my former work (apologies for the bad
language!) I have a number of power meters complete with sensors
to 40GHz. While for historical reasons I don't lend instruments,
I'd be quite happy to 'calibrate' anyone's home-made sensor.
While I have working a 8485 and a 8482, I also have a damaged
8481 which suffered a gross overload due to my utter stupidity.
Although a repair would be possible, I can't now justify the cost
of the replacement thermal sensor module.
I have somewhere seen a design for a diode detector module
designed as effectively a drop-in replacement for the 8481
electronics (albeit with out the accuracy!). Does anybody have a
On 25/09/2020 08:39, geoffrey pike via
I have used a AD8317 in a non
working HP435B and without changing its original state, just
use the meter.
From my notes(i actually have
them), its performance at 10 GHz (AD8317 spect to 8GHz) shows
reads about 20 dB low the
real value and fairly good to 8GHz. Scaling on the meter is in
my case -5dBm FSD and -30dBm mid scale with 55dB range.
The AD8317 does have a -ve
output slope, anyway for about a tenner you have a meter that
you can abuse and not worry about the thermistor head
On Thursday, 24 September 2020, 21:25:07 BST, Paul
Randall G3NJV <paulfrandall@...>
Having explored multiple avenues to
get a calibrated power reference into my workshop I
finally bit the bullet and bought a cheap HP435B
non-working power meter for parts for a home-brew power
meter. On delivery, I find it in good condition and might
even be completely working - just the power switch not
So now I'm in the place I dreaded, I'll find it hard to
break this classic instrument just for parts so am
wondering if anyone out there has a power sensor and cable
just lying around unused that they might part with.
An 8481A is the ideal of course but on ebay with cable it
is more than my monthly pension so might as well be made
of unobtainium. I guess even a long term loan would be
good - once I have finished building my projects to
venture into the microwave region, the entire instrument
could be retasked to a new home.
So, any possibilities out there? I'd be glad to hear.
73s Paul G3NJV