[K3] Broadcast interference on 160M

[Bill Frantz]

I switched to 160 meters with the band switch and the P3 showed
the band filled with what looked like AM signals. I tuned one of
them at 1.810 MHz and listened. The station identified as KGO,
about 20 miles away with three beautiful towers at the edge of
San Francisco bay. (Serious antenna envy here.)

I then tuned to 810 KHz and indeed KGO was there as expected. I
then used a band memory to switch back to the CW portion of 160
meters and the interference was gone.

I think I have seen AM broadcast interference on 160M before,
but I may be mistaken. Any ideas about what is going on?

I have new synths and a new KBPF3A with the MF/LF mods. K3 is
6299. I did tune down below the BC band on November 14 when
there were a lot of stations active down there, but the radio
came up in the ham band when I switched with the band switch.

73 Bill AE6JV

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[wayne burdick]

Hi Bill,

I haven't heard anything like this myself. If you find a repeatable way to make it occur, please pass it along and I'll try to duplicate it.

Meanwhile, the workaround sounds like switching bands, then back to 160 m.

73,
Wayne
N6KR


On Dec 1, 2015, at 2:51 PM, Bill Frantz <[hidden email]> wrote:

> I switched to 160 meters with the band switch and the P3 showed the band filled with what looked like AM signals. I tuned one of them at 1.810 MHz and listened. The station identified as KGO, about 20 miles away with three beautiful towers at the edge of San Francisco bay. (Serious antenna envy here.)
>
> I then tuned to 810 KHz and indeed KGO was there as expected. I then used a band memory to switch back to the CW portion of 160 meters and the interference was gone.
>
> I think I have seen AM broadcast interference on 160M before, but I may be mistaken. Any ideas about what is going on?
>
> I have new synths and a new KBPF3A with the MF/LF mods. K3 is 6299. I did tune down below the BC band on November 14 when there were a lot of stations active down there, but the radio came up in the ham band when I switched with the band switch.
>
> 73 Bill AE6JV



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[Bill Frantz]

To follow up on an old message. I took the antenna down and
inspected it. The connection between the feed line and the
copper-clad steel antenna wires used galvanized hardware. This
hardware was quite corroded. A private email had suggested this
possibility. The corrosion was probably acting as a diode and
generating harmonics from the AM signal. I replaced the hardware
with brass. We'll see how long it lasts.

73 Bill AE6JV

On 12/1/15 at 2:51 PM, [hidden email] (Bill Frantz) wrote:

>I switched to 160 meters with the band switch and the P3 showed
>the band filled with what looked like AM signals. I tuned one
>of them at 1.810 MHz and listened. The station identified as
>KGO, about 20 miles away with three beautiful towers at the
>edge of San Francisco bay. (Serious antenna envy here.)

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