Good question Roy
I was hearing the St Catherine station very loud on 1830, but with
intermittent periods where it would dropout. This was at a time with
high winds in the NE. I suspected that it might be a problem at my
shack, so I tried to find CKTB and it is on the same frequency as a
local station in NH on 610. I can hardly hear it on my radio due to
interference from that local station. It was about S9 or -70 dBm as near
as I could tell with a beverage receiving antenna, but there are many
more stations that are at -40 or even -30 dBm coming in at the same
time. There is a local station in the next town, 8 miles distant that is
on 930 MHz. I do hear a very weak 2nd harmonic of it on 1860. It is not
much of a problem compared to the station in Canada many hundreds of
miles away. If I had a local rectification problem, it would involve the
strongest local stations and not something I can hardly copy. Still, I
wondered at first and then made some measurements looking for other
distortion/rectification problems. All I see is the 3rd harmonic of the
610 Canadian station.
73
Dave K1WHS
On 3/26/2020 4:36 PM, Roy Morgan wrote:
Is it possible that the interference is being generated not by the transmitter
but rather by bad connections in power lines or utility pole guy wires nearer
to you?
Some driving around with a portable radio with loop stick antenna might reveal
or confirm the location of the signals.
Hams in the past have discovered that TVI was caused not by their transmitter
but rather by their own gutters, downspouts or wire yard fences.
Roy Morgan
K1LKY Western Mass
On Mar 26, 2020, at 12:04 PM, Rick ve3mm <richardstasiak@gmail.com> wrote:
....The spurious signal on 1830 khz seems to occur when
it is windy in the area and appears to becoming more frequent.
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|