There is on eBay at the minute what appears to be a very cheap HP
network analyser, which I guess would double as a cheap power meter too.
The "buy it now" is under $75. Cheaper than the amateurish instruments
that give "some idea about the magnitude of the impedance".
It's an HP 3570A, which the tucker web site give a bit of info
http://www.tucker.com/java/jsp/doorway_partnoH-P3570A_invid2370.htm
although I think the max frequency is 13MHz, not 500 as stated there.
Hence the frequency range is a bit limited.
Here's a bit more info.
http://www.tucker.com/images/images_spec/00004350.pdf
The unit on eBay has option 004, which is the GPIB interface, so you can
read (and often set) the instrument via a computer.
The seller is definitely in what I would call the "doggy" category.
Although he has over 1000 feedbacks, there are a lot of negatives (94.8%
positive).
A friend tells me the model number indicates it is likely to be very old.
Anyway, here's the link to the eBay site.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=97192&item=7525812615&rd=1
It's clearly not without its risks, and I don't know much about it, but
on the face of it, the unit would seem quite cheap and useful. But
perhaps someone knows otherwise.
You could extend the frequency range with mixers and a couple of sig
gens, but then calibration would be much more difficult.
PS
If you do buy it, do your homework. Don't blame me if it needs an XYZ
that is impossible to obtain, or if its dead and the seller will do
nothing about it.
--
David Kirkby,
G8WRB
Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/
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