Bars have video games. I once had to answer an FCC query about our equipment in a bank building which was next door to a bar. The source ulimately came >from the video games. Other than bar’s they may have nothing else in common but if you can get close to the games with an antenna or even shut them off for a bit it could be a quick easy check.
Gary _____ From: [email protected] [mailto:[email protected]] On Behalf Of Fred Townsend Sent: Thursday, April 19, 2007 2:41 PM To: [email protected] Subject: Re: Interference with a 916 MHz link Derek that wouldn't be the first time a man couldn't drink a problem away. 1. What is your IF setting on your SA? It should be on your widest setting not narrow band. 2. Is there any military around, possible running troppo? 3. Squelches are designed not to respond to pulses so I am not surprised the squelch must be turned off. 4. Is the ham receiver FM? A SSB receiver (rare at UHF) would probably give you a better idea what is going on rather than something that is designed to ignore AM. 5. Have you tried putting a directional antenna on the Ham receiver and finding the direction of arrival? 6. Finally get an IFM receiver. They are designed to capture a single pulse. 7. Any new cars parked around? Several new cars, including Corvettes use 900 MHz bursts in the security systems. Fred Townsend DC to Light Derek Walton wrote: 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 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 Text inserted by Platinum 2007: This message has NOT been classified as spam. If it is unsolicited mail (spam), click on the following link to reclassify it: It is spam! <http://127.0.0.1:6083/Panda?ID=pav_133005&SPAM=true> ______________________________________________________________________ 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 - ---------------------------------------------------------------- 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
