[Elecraft] K2: Broadcast Station Breakthrough on the 80 Metre Band

[Ken, KA0W]

Hello Kevin!

too much antenna gain - better cut it in half - "HI!"

The tuner maybe acting like a BandPass filter keeping
the the BC out.

You may have sufficient gain at BC frequencies now
with the new antenna. 

At times, especially in foggy or wet local conditions,
I receive interesting things when using my 80m 1/4
wave vertical. Within a few short miles are MW BC
towers.

Have fun with the new antenna!

Ken, KA0W
K2/100


    


--- KBG Luxford <kbgluxford at fastmail.fm> wrote:

> Hi Gang,
> 
> Here's a funny thing.  I have just replaced my two
> parallel connected 
> dipoles (one cut for 80, the other cut for 40,
> connected together at the 
> apex and fed by a 1:1 balun and RG58CU coax) with a
> double zepp with 
> just one set of radiating elements cut a little
> longer than required to 
> resonate on 3.6 MHz, and fed with 450 ohm balanced
> line connected to a 
> 4:1 balun just outside the shack and a short length
> of RG58CU to the K2 
> with KAT100.
> 
> The apex of the new antenna is some 12 feet or so
> higher than the old as 
> I now leave my wind-up tower fully extended. 
> (Extended height is about 
> 45 feet). Seems to work well, except that I noted
> considerable broadcast 
> station breakthrough on the 80 metre band that was
> not experienced with 
> the old dipoles.  However, when the Tune button is
> held and the KAT100 
> does its magic, the breakthrough disappears.
> 
> Curious.
> 
> 73
> Kevin
> VK3DAP / ZL2DAP
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