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 than that.
I'll find out if that is the source, before asking what can be done do
cut down on the RFI.
Thanks Jim K9YC for your comments, too.
Randy
On 1/12/2018 2:36 PM, Leonard Halvorsen wrote:
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.
On Fri, Jan 12, 2018 at 3:24 PM, Randall K Martin <rkmassoc@comcast.net
<mailto:rkmassoc@comcast.net>> wrote:
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
interesting is that there is a second signal which is much weaker on
7041.9 which is the exact inverse of the first. When the first
signal is on, the second is off, and vice versa. Both sources peak
at the same heading, roughly 90 degrees from my main 40M yagi.
I have zeroed in on a spot about 2000 feet east of me where the main
signal is almost 40 dB over on a mobile rig (K-3 with hamstick).
I've ordered a DF loop antenna so I can try and pin it down further
before knocking on doors. There are four houses in the immediate
vicinity.
Just wondering if anybody in this group has ever come across
something like this. Google searches and archive search for this
reflector came up empty. The signals do not drift in frequency.
Speculation as to the source?
73 Randy K0EU
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