[Elecraft] Center-fed antennas

[Don Wilhelm]

Joe,

I agree completely, bring your Johnson Matchbox to the next Field Day! 
Or even your old plug-in coil open frame link coupled balanced tuner.

Who has a link coupled tuner (like the Johnson Matchbox) these days? 
Those are big boat anchor box these days (and hard to find).  I have one 
that sees little use, but I am not willing to part with it.  It does a 
good job when needed.

Most autotuners are of the L-network design and the manual tuners are 
typically T-network - the L-network can be a high pass or a low pass 
filter, but the more common T-network is always a high pass filter.  If 
one has an old Collins tuner, it may be a Pi-network which is a low pass 
filter.

As you pointed out, the link coupled tuner is a bandpass filter, but 
fixed tune bandpass filters will do just as well for multi-station 
operation.

73,
Don W3FPR

On 10/10/2019 7:57 PM, Joe Subich, W4TV wrote:
> 
> The one "multiband" antenna one can use in a multi-transmitter
> configuration is the flat-top with open wire feeders and a
> *Link coupled* tuner.  The link coupled tuner is a bandpass filter
> that significantly reduces harmonic/broadband noise just like the
> "Q" of a single band antenna.
> 
> 73,
> 
>     ... Joe, W4TV
>