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

[Roy Morgan]

Dave and other Topbanders,

I plan to do some listening from here in Western Mass, USA (Near the junction of NH/VT/MA).  The wind speed here is expected to peak tomorrow afternoon at 10 MPH,  maybe not enough to jangle what’s loose in Canada.  Is this Saint Catherine in Quebec?  Near Niagra Falls someone mentioned.  10 MPH there or below till Sunday’s high of 15 MPH.

> On Mar 26, 2020, at 2:32 PM, David Olean <k1whs at metrocast.net> wrote:
> 
> 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 have not yet heard it, but do I remember correctly that the 1830 *harmonic* of a station on 610 would sound very strange and muffled because the sidebands/audio wold be multiplied as harmonic also?

> I tried to find CKTB and it is on the same frequency as a local station in NH on 610.

I am in Western Mass and so that NH station on 610 may be strong here (at night at least).  I finally found (on Wikipedia!) that the NH station on 610 is at Manchester, NH.  Their website does not reveal their location or address that I can find.

> If I had a local rectification problem, it would involve the strongest local stations and not something I can hardly copy.  

Yes, I agree.  That makes good sense.

> All I see is the 3rd harmonic of the 610 Canadian station.

It occurred to me to check my memory on this.  If the fundamental is on 610, isn’t 1220 the first harmonic, and 1860 the second harmonic?  It has been some time since I had that straight in my mind.  Maybe the fundamental multiplied by two is the second harmonic.

In this very much stay-at-home time here, I look forward to some radio listening.

Roy

Roy Morgan
K1LKY since 1958
k1lky68 at gmail.com