Topband: Spurious transmissions on 1830 khz by CKTB (610 kHz), St. Catharines ON

[David Olean]

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 at 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.