[RFI] AM Radio Interference On 75 meters
Joe
wa6rkn at gmail.com
Tue Sep 18 13:39:01 EDT 2012
Ok, this is not my station.,.,the station (N6TNI) being affected is 8 miles,
(approx) NE of the broadcast tower.
I came here as I am a member here and Dan is not. There are a number of us
trying to help him out with his problem, and I thought I would put forth his
problem here to try and find a solution.
Sorry for the unintentional mislead.
It affects me because he can't hear me over the RFI..even when I crank up
the amp to legal limits..Only a few of the 'very' local yokels can put out
a signal strong enough to get over the interference, and I sure am not local
to him...(There is this very tiny obstacle between he and I..called the
Sierra Nevada mountain range! LOL)
Joe - WA6RKN
----- Original Message -----
From: "Jim Brown" <jim at audiosystemsgroup.com>
Subject: Re: [RFI] AM Radio Interference On 75 meters
> On 9/18/2012 9:54 AM, David Robbins wrote:
>> 3960khz is not a harmonic of 1530khz so something else is also happening
>> here. listen carefully to the kfbk signal and see if there is some other
>> signal mixing with it. check for other harmonics and other signals that
>> it might be mixing with to end up on 3960...
>
> Yes. I did some poking on the FCC website. KFBK is 50kW DA2 -- that is,
> directional both day and night, different patterns day and night. The
> nighttime pattern has deep nulls east and west, putting all of California
> in their main lobes. WA6RKN is in Reno, which is 80-100 miles almost due
> east of the KFBK transmitter site (which is 32 miles N of Sacramento). If
> their antenna system is functioning properly, there should not be much
> fundamental in the direction of Reno at night. Obviously that directivity
> exists only on 1530, not on the frequencies of harmonics or spurs.
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