Hi,

At only 22ft per leg, sounds like you might have a 30 meter dipole, resonant around 10 mHz.

Adding a 4 to 1 BALUN will take the balanced feedline to balanced 50 ohms to enter your tuner.

Frank N6CES

On Sat, Apr 13, 2019, 7:23 PM Bob KM6BMX <km6bmx@...> wrote:

Hello, 

  I plan to operate my 4S-Tuner with a 40m "Doublet" antenna.  The doublet has two 1-wire legs, 22 feet each, with a 28 foot 2-wire feedline, which I assume is "balanced". (See URLs below for details). 

 

  I have 2 questions. 

 

    I recently re-read the manual, which states the following:  "With an external balun it will also match antennas with balanced feedlines."  However, there are 2 binding posts that share the same internal circuit connection as the output BNC connector ("ANT"). 

  

  Q1:  Can I just connect the "balanced" 2-wire feedline directly to the posts, picking one as the "antenna" and the other as "ground"? 

  

  On a related note, it seems that the 4S-Tuner is geared primarily towards high-impedance antennas, such as EFHW. 

 

  Q2:  How does it perform with an antenna with an impedance close to the nominal 50 ohms? 

  

  Thanks much for your insights!

 

Cheers & 73,

Bob KM6BMX  

--  central AZ

  

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    NorCal "Crappie" antenna 

  http://www.norcalqrp.org/crappieantenna.htm

  

NorCal "Doublet" antenna

  http://www.norcalqrp.org/norcaldoublet.htm

 

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