[Elecraft] Center-fed antennas

[Mike Flowers]

Extra Class licensees vs. Extra Class Operators ... huge delta there ...

-- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

> On Oct 10, 2019, at 4:12 PM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> 
> I used my Johnson Matchbox at our Field Day event about 3 years ago.   I went through each band and several frequencies on each band and compiled a written chart identifying the settings for each band/frequency.    After 2 hours of trying to work stations on 20M,  the radio failed and they came to wake me from my late night nap.   The result is the Matchbox was adjusted for 80M in the CW portion and the operators were complaining of high SWR and no power output on 20M.   It took 2 hrs for them to observe this?    I was amazed at the number of "Extra Class" operators at the site that thought the tuner was automatic and would change with band / frequency changes on the radio.  The radio by the way WAS NOT an Elecraft product.
> 
> 73
> 
> Bob, K4TAX
> 
> 
> 
>> On 10/10/2019 7:35 PM, Don Wilhelm wrote:
>> 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
>> 
> 
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