> Would like to tune and match 5 mm VSP-200 Bruker probe using swe=
ep
>generator, rf bridge, 50 ohm terminator, and oscilloscope. Have TEK 475
>200 MHz scope. Need sweep generator, rf bridge, and 50 ohm terminator.
>Want to tune probe anywhere between 9 and 82 MHz. Don't want to spend a=
lot
>of money. Will collect useful responses and post back to the group.
An interesting gadget, which I have seen, but not yet tried for the
purpose, is made by AEA, Inc.: Main Office: (206) 774-5554
The following description was taken from their web page.
AEA SWR-121 Antenna Analysts: Two models are available:
SWR-121 V/U: 120-175, 200-225, and 400-475MHz and the
SWR-121 HF: 1-32MHz. Both units are compact, battery powered, and
tough. AEA's Antenna Analysts display a plot of the VSWR curve for
your antenna on a LCD graphic display. Enter the desired frequency =
and
bandwidth on the keypad, connect your antenna, and see the plot of =
your
SWR vs. frequency and return loss displayed in dB. With the optiona=
l
software and cable package, AACOM, both units can be connected to a
computer for remote controlling, viewing, saving to disk, and print=
ing
your antenna's plots. Commercial versions are also available: 30-13=
7
MHz, 150-400 MHz, and the CellMate=81 (806-960MHz) for testing
cellular antenna systems and sites.
I spoke to one of their reps last month, and other frequency ranges may b=
e
available on special request (I was looking for one to go to 500 MHz).
Cost is under $500 for the commercial version (under $200 for the hobby
versions), much less than the sweeper and bridge. They are LCD displays =
in
a plastic case, and could potentially be mounted right at the magnet (the=
re
is a 9v battery which is magnetic).
Carl Gregory
Biomedical Magnetic Resonance Laboratory
College of Medicine
University of Illinois
1307 W Park St
Urbana, IL 61801
(217)-244-2350