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
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