[Elecraft] K2/100 AM (MW) Broadcast Intermods on 80m - Partial Conclusions

[walter renner]

I found some strong intermod products from AM (medium
wave) broadcast stations on and around 80m when using
a large inverted L and low-pass L-network antenna tuner

Hi Steve, Regarding your post on AM broadcast stations producing intermod 
products.
I have been have similar experience with my K2/100 on both 160 and 80m using 
and 250 ft
center fed dipole that is fed with ladder line and using an L-network tuner 
allowing multi band operation.
If I use my home brew T-match tuner the intermod is not  detectable, but 
becomes a problem when the L-network tuner is put back in line.
I downloaded articles form ARRL web site and found information on BCB 
High-Pass Filters.
>From that information I was able to build a filter that would handle 100-150 
watts RF
and placed it in-line ahead of the K2/100. My results have been very 
rewarding and even gave
added benefits, that allowed the KAT100 to work on frequencies that it would 
not work
properly before.
Placing an 50 ohm dummy load outside of the filter, shows the filter to be 
transparent at
all frequencies above 160m.
There are also High-Pass filters available commercially that allow you to TX 
thru them.


73 Kurt - K0ARO