I don't want to nit-pick Hellosailor's posting
....but, I do want you to know that there is a whole lot more
Originally Posted by Cadence
An excellent explanation even I can understand. Thanks!
Again, not wanting to get into the esoteric, just wanting to clarify a bit...
I wish we could go back to when we called our "tuners" antenna couplers....'cause that's what the are....they simply "couple" the transmitter/transmission line to the antenna!!
But, we're stuck with calling them "tuners", I guess...
Without delving into this deeply, for our application (mostly skywave comms, from 2-4mhz thru 22-25mhz) we ask a LOT of our antennas and couplers (tuners), and as such trying to make ONE antenna work effectively/efficiently with low-loss in the coupler, etc., is an exercise in compromise!!
As Bill (btrayfors) wrote succinctly
Originally Posted by btrayfors
Longer is better for the lower bands/frequencies, i.e., below 10mHz. Shorter is better for the higher bands/frequencies, i.e., above 10mHz.
Several things to keep in mind about length:
1. overall length is calculated from the terminal on the tuner (i.e., includes the GTO-15 feed line);
length is different than physical length; you must take into account the velocity factor of the antenna wire itself if you want to accurately calculate electrical
3. length generally isn't critical; don't worry too much about it.
A good compromise length for all frequencies has been found to be 40-45' overall.
Notice is use of the word "compromise"!!
There is a reason for this word, and a reason that I highlighted his posting
earlier....'cause it explains "how-to do it", without delving into the minutia (like I do!)...