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Total 6 documents matching your query.

1. [RFI] 40M QRM/RFI (score: 1): Author: Randall K Martin <rkmassoc@comcast.net>; Date: Fri, 12 Jan 2018 13:24:09 -0700; I have recently noticed a 24-hour per day source of QRM on 40M CW. On 7031.9 there is a steady stream of dashes, with the dash lasting about 1.5 seconds and then a space of 0.5 seconds. What is inter; /archives//html/RFI/2018-01/msg00013.html (7,740 bytes)
2. Re: [RFI] 40M QRM/RFI (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 12 Jan 2018 12:35:21 -0800; Hi Randy, Yes, I often see signals like these on the P3 spectrum display on 160 and 80 CW. They are likely generated by a microprocessor that's part of a control system some sort appliance or the com; /archives//html/RFI/2018-01/msg00014.html (8,541 bytes)
3. Re: [RFI] 40M QRM/RFI (score: 1): Author: Leonard Halvorsen <lhalvors@pppl.gov>; Date: Fri, 12 Jan 2018 16:36:58 -0500; Are those 4 houses high-rent-district kind of places? Sounds like maybe a memory or sensor refresh on a security or fire detector system. _______________________________________________ RFI mailing l; /archives//html/RFI/2018-01/msg00015.html (8,778 bytes)
4. Re: [RFI] 40M QRM/RFI (score: 1): Author: Randall K Martin <rkmassoc@comcast.net>; Date: Fri, 12 Jan 2018 14:44:22 -0700; I am fairly certain that one of the houses has a security system installed. Do these generally have some kind of main control unit that I could have him unplug as an easy test, or is it more involved; /archives//html/RFI/2018-01/msg00016.html (9,707 bytes)
5. Re: [RFI] 40M QRM/RFI (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 12 Jan 2018 13:53:22 -0800; Yes, that certainly could be a source for signals like this. If the source could be identified, it might be possible to suppress it with one or more multi-turn ferrite chokes, as described in my Kill; /archives//html/RFI/2018-01/msg00017.html (7,528 bytes)
6. Re: [RFI] 40M QRM/RFI (score: 1): Author: Gedas <w8bya@mchsi.com>; Date: Fri, 12 Jan 2018 17:36:11 -0500; Yes most if not all will have a main PCB controller board with a uP or at least a u-controller and all kinds of discrete and integrated drivers and relays inside the main control panel box. That unit; /archives//html/RFI/2018-01/msg00018.html (11,773 bytes)

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