Topband: RFI on TB

Mark - N5OT r-emails at n5ot.com
Wed Jul 24 17:34:59 EDT 2019


This has got to be on a case-by case basis.  I don't have any listening 
antennas, so i listen on my transmit vertical.  It works fine.  For me.  
Most of the time.

Would I hear more stuff with listening antennas?  I bet the answer is 
yes under certain conditions.

73 - Mark N5OT


On 7/24/2019 1:13 AM, Guy Olinger K2AV wrote:
> I gotta agree with Rob. An inverted L aerial wire will hear ALL the noise
> that is around. Mine sure does. RX antenna will help enormously if there is
> a place to put one that does not get the noise second hand off the L. Not
> enough room? A bit complicated, but "repeated" noise off the L can be dealt
> with.
>
> The worst noises around here heard on my L were all repaired by the power
> company. The nastiest noise was very hard to find, I actually never "found"
> it by looking for it. Noise turned out to be from a bad splice in an
> underground 13 kV cable going from the 13 kV delta overhead out on US 64 to
> the transformer for my eastern neighbor and next house over. It would come
> and go with extended cold weather, but never would correlate to sunlight or
> darkness. I would hear it next to my transformer walking around with my
> battery K2 and a rubber ducky. It would never locate to up on a pole (only
> power noise that didn't).
>
> Finally the splice hard-arced, exploding the fuse up on the pole for the
> neighbor's 13 kV feed, and taking those two houses off the grid. The noise
> went away with the cannon shot noise. Blessed quiet on 160 and 80. I had
> put up with that for almost four years.
>
> In the end, Duke Energy completely reran his AND my buried 13kV lines, and
> replaced his transformer. 35 years in the ground, 35 year old cable design
> and materials, and deficient in THEIR opinion. Was really fun to watch them
> use this super-neat burrowing setup that went right UNDER the woods and the
> creek (whole other story). Now I can hear the lesser noises on my L from
> all over Apex and Cary :>)  Need RX antenna for sure. That way I don't have
> to listen to the Cary, NC noise (NE) at the same time as the generally
> closer and louder Apex, NC noise (S, SE).
>
> 73, Guy K2AV
>
> On Tue, Jul 23, 2019 at 9:37 AM Rob Atkinson <ranchorobbo at gmail.com> wrote:
>
>>> Over past few months, I have picked up an S5-S7 noise signature on my TB
>> inv
>>> L antenna with K2AV FCP system.
>> I would not use an inverted L for receiving.  Unusable for rx at my
>> QTH but FB for transmitting.
>>
>> 73
>> Rob
>> K5UJ
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