Anyone near an FM station on ~97.1

When I lived near Chicago I heard a mixture of two AM broadcast on 80m
using a 160' high rotating dipole. I assumed that something was rectifying
but I never found the solution. I am curious if you are received this
interference while using bandpass filters.

John KK9A



Mike Wetzel W9RE wrote:

I have had an interference problem on the top part of 15 meters (21380 to
21450) from an FM station 1 mile from my house whose frequency is 97.1Mhz.
It peaks about S6 and is quite noticeable with only coax connected and no
antenna selected.  I have (2) -K3 and it is present on both.  I installed
new synth boards in one but the interference is still there.  It sounds like
a very broad FM signal.  I had the station engineer do a spectrum search and
he found no issues.  I do not find this interference on an Icom radio.



Has anyone else experienced this and if so have you found any solutions?  I
did a check of just the K3 (a  year or so ago) on battery power and no other
connections and it was still present although much weaker.



Thanks,



Mike W9RE

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[Jim Brown-10]

On 7/24/2018 9:17 AM, [hidden email] wrote:
> When I lived near Chicago I heard a mixture of two AM broadcast on 80m
> using a 160' high rotating dipole.

I first experienced this in 1953 (before I was licensed) with stations
near me on 930 kHz and 1470 kHz mixed on 3870 (I think). This is nothing
more than passive intermod, and can occur virtually anywhere, including
in one of the transmitters! I also experienced it intermittently when I
lived on the northside of Chicago three miles N of Wrigley Field, and
the mixes were of 50kW stations with TX locations 20 miles W of me. I
even heard WBBM's second harmonic (on 1560 kHz)!

73, Jim K9YC

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