3rd harmonics of NDBs can be a real problem on the 160 meter amateur band
also.
Several have caused QRM (interference) to stations there, and had to be
shut down
temporarily for repair. The NDB transmitters are rather primitive affairs,
without much
attention paid in design to spurious or harmonic generation.
Incidentally, VTR is more likely mixing with the carrier of KFQD in
Anchorage on 750 kHz,
and producing output on 1050.
73,
Fred W2AAB
On Thu, Nov 19, 2020 at 2:38 PM Paul B. Walker, Jr. <
walkerbroadcasting@gmail.com> wrote:
> No wonder I can hear the local airport Beacon on it’s 3rd harmonic! VTR,
> On 350khz is 1000 watts and it’s maybe 1/4 mile away! Most beacons are a
> 25/50 watts, maybe a few hundred.
>
>
> I can hear it on 1050khz! Here’s a clip of CJNB 1050 North Battleford,
> Saskatchewan 2000 or so miles away on my CC Skywave portable... and you’ll
> hear the beeep beeep beep of the beacon under the music.
>
>
> I’m told the Beacon is so powerful because of the flight path
> international flights going to/from Anchorage 230 miles to our Southeast
> travel through our immediate region in McGrath.
>
>
> Audio:
>
>
> https://drive.google.com/file/d/1ZEKepOdjYvdMc-Yvv945W0O-conu6sWx/view?usp=drivesdk
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