You'd be surprised how far an NDB signal can go, especially at night, and
especially when running 1 KW. And with a weak signal on the product
frequency,
it's quite possible.
Mixing products from NDBs have been heard on 160 meters 1,000 miles away
from the NDB, mixing with a BC station hundreds of miles away.
OTOH, 3rd harmonics are certainly possible. NDB transmitters are both
unmanned
and notoriously dirty.
73
On Thu, Nov 19, 2020 at 7:38 PM Paul B. Walker, Jr. <
walkerbroadcasting@gmail.com> wrote:
> I doubt VTR is mixing with a station 230 miles away
>
> On Thu, Nov 19, 2020 at 2:50 PM FRED BELGHAUS <fbelghaus@gmail.com> wrote:
>
>> 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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