________________________________
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Julian
Jones
Sent: Monday, August 11, 2008 3:36 AM
To: emc-p...@ieee.org
Subject: monopole recommendations
we need to get a back up for our EMCO 3301, 41 inch rod antenna.
looking for recommendations for what other labs are using. I've noted
the
changes MIL 461F brings with grounding the connector especially.
I've almost finalised on the A H systems SAS-550-1B has anyone got /
used
this one ? any problems to report.
Rgds
Julian Jones
Hursley EMC Services
Tel: 023 8027 1111
Mob: 07787 523 607
ju...@hursley-emc.co.uk <mailto:ju...@hursley-emc.co.uk>
Unit 16, Brickfield Lane
Chandlers Ford
EASTLEIGH, Hampshire, SO53 4DP
Company Registration 3301279
Julian:
I have been using an SAS-550-1B for about ten years, and I like it quite a
bit. It has an internal battery that gives about 8 hours operation, almost as
long as the venerable old Stoddart 95010-1. The gain flatness isn't a smooth
as the Stoddart, but the sensitivity is a little bit better (mine averages
about -11.3 dB AF; I don't know if that's typical or I'm just lucky). (Ken
Javor mentions the 0 dB factor, but that was available only when you used the
capacitive top-hat and extended the rod to about 50"; so when a standard calls
for a 41" rod, active or passive, the old Stoddart could only give you a flat
8 dB antenna factor.) The slightly non-flat AF is no problem with modern
acquisition systems; if your software can handle the wiggly factor of a
biconical, the active rod will seem almost flat in comparison.
A couple of years ago, I had AHS modify my active rod to allow me the ability
to have an active loop antenna. They changed the top connector to a type N,
added a switch on the side to select rod or loop, and added some circuitry
inside the amplifier box. I can now connect either their 41" rod or 12" loop
to the amplifier base. This is a good bargain if you need to do both electric
& magnetic fields.
Reliability has been excellent. Battery life is long enough that I don't have
to worry about external power. It is ESD sensitive, so no touching the exposed
rod element!
Ed Price
ed.pr...@cubic.com <blocked::mailto:ed.pr...@cubic.com> WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (FAX)
Military & Avionics EMC Is Our Specialty
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