Try tuning the SA to 916 MHz, zero span, wide RBW, video triggering, fast
sweep speed. The SA should be able to see the pulse that the Ham receiver is
picking up. A 1 Hz PRR should be fairly easy to find.
Unless:
1.
The pulse is on an image frequency of the receiver.
2.
The pulse is way out-of-band somehow.
Try to locate the signal source using a directional antenna. Some Hams do this
for fun, and usually can find a hidden transmitter in a couple of hours. See
if your local radio club wants a practical T-hunt (you could all meet at the
bar later).
Ed Price
<mailto:[email protected]> [email protected]
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
_____
From: Derek Walton [mailto:[email protected]]
Sent: Thursday, April 19, 2007 1:34 PM
To: IEEE EMC Discussion Group
Subject: Interference with a 916 MHz link
Hi folks,
2 questions in one day: my apologies if I'm exceeding my share of bandwidth!
I'm helping a company track down what sources there may be to interfere with a
short wireless data link running at 916 MHz.
In our lab out of town we get almost 100% packets transmitted. In a bar in
town ( were there because this is used in a bar and we were not sampling their
wares, well, until we were done ), the packet success rate drops to only 60%.
A SA shows little interference, but a Radio ham receiver tined to 916 MHz can
pack up a strong click every second or so. The click is very loud, BUT, it
does not lift the receiver squelch implying its very fast.
We don't think this is local, since that signal can be received over several
square miles.
Anyone have suggestions as to what this could be?
Thanks,
--
Derek N. Walton
Owner L F Research
www.lfresearch.com
Phone: (815) 566 5655 - ---------------
------------------------------------------------ This message is from the IEEE
Product Safety Engineering
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________
- ---------------------------------------------------------------- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected] Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected] David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
