[Elecraft] Interesting K3 QRM problem

[Al Gulseth]

Pardon my ignorance here, but I thought a link coupled tuner would be more of 
a bandpass than a high-pass filter. CLC T-network tuners (MFJ etc.) are the 
ones usually associated with becoming high-pass networks if misadjusted.

73, Al

On Thu October 23 2014 12:55:15 pm Al Lorona wrote:
> This doesn't apply in Vic's case here, but his situation reminds me of yet
> another benefit of using a link-coupled tuner with balanced line feeding a
> horizontal antenna in the center.
>
> A balanced link-coupled tuner turns out to be a high-pass filter, so while
> you're tuning it up on a ham band, it's rejecting stuff in the AM broadcast
> band.
>
> When tuned on 80 meters, I've measured the 1400 kHz rejection of my tuner
> at about 40 dB. Forty dB makes a 50 kW signal sound like a 5 W signal. I
> might be in bad shape if I didn't have this tuner.
>
> Another good thing to remember when planning an antenna installation.
>
> Al  W6LX
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