I have a similar situation here, two radio stations one about a mile and is
10KW with the pattern North covering the entire Twin City area, the other
station is about 8 miles is a 50 KW station. The 50 is on 1.130 Khz, the 10 is
on 1.330, both yak-yak stations (talk stations, yuk). The mix is on 3.790 I
can hear a strong 3rd harmonic on 3.990 from the 10. It comes and goes
depending on the season, and weather. I think it might have something to do
with the phone lines around here, loose connections or poor grounding
something.
I have contacted the 10 Kw station manager and he said they would have their
engineer check out the system, this was a few years ago. I believe these
smaller stations use consulting engineers now and have no engineer on duty,
plus everything is remoted, all operational parameters can be seen on a
computer screen somewhere distant. I don't believe it's the stations fault,
but overhead wiring, phone, cable etc. This problem is not nearly as bad as
the plasma TV so it's not causing near the problem for my operation. Both
stations switch power at night and the interference is at a low level even
during the day and only on 80 m. band.
The 50 Kw station on 1.130 used to be WDGY (A very long history) and only about
a half mile from me, I never had any problem with it then. Some years ago it
changed hands and moved several miles South and it's call letters changed to
WFAN, sports talk. I don't know what there is to talk about sports 24/7, must
get awful boring for those on air talents, hi. I think they use some heavy
compression because I can hear breathing between syllables, but don't know that
for fact.
Be sure the mixing or rectification is not in your own shack or antenna system.
GL
Dale, k9vuj
On 19, Apr 2014, at 20:46, Rich Hallman - N7TR <rich@n7tr.com> wrote:
> If anyone tried to watch the video and wasn't able to access...I just fixed
> the permissions. Thanks...
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Rich Hallman - N7TR
> Sent: Saturday, April 19, 2014 6:13 PM
> To: rfi@contesting.com
> Subject: [RFI] Broadcast station RFI Mixing
>
> Over the past year I have been hearing a local broadcast station on 80 and 40
> meters. 80 meters is the worse. Filters will not help, and sounds like
> there is something rectifying. I think I may have a problem on the power
> pole since it seems to go away for a day or so after it rains. Also...I have
> not eliminated that there may be a problem at the broadcast site. The
> station is KKOH and is about 10 miles from me...but line of site.
>
> I did a YouTube video of what I am hearing...and for the most part I can hear
> the carrier every 10 khz...so places like 3900 is real bad. With the
> intermittent connection as it sounds like...it messes up the entire 80 and 40
> meter band. Sounds like a bad connection in my antenna...but I have already
> confirmed my antennas are fine and I confirmed I can also hear the mixing on
> a mobile 80 meter whip in the truck as well as other antennas. On 40 its
> lower signal...but also can be heard every 10 khz or so and the mixing is
> very intermittent / scratchy. Seems like its also more intermittent with
> wind.
>
> Here is the video... http://youtu.be/rZ8gXRKGkxE
>
> I just emailed my power company the video as well. Will get the KKOH station
> engineer to listen as well to make sure they don't have an issue with an
> insulator or ground on their tower.
>
> Any other thoughts?
>
> Rich N7TR
> ex KI3V, N3AMK, WB3JOV
> www.n7tr.com<http://www.n7tr.com>
> http://www.qrz.com/db/N7TR
> Telnet: dxc.n7tr.com N7TR DXCluster
>
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