Bill:
When I lived in Columbia, SC I had restrictions and could not put up a
tower. However, I had a couple tall pine trees for supports.
I built three delta loops, one for each band, 10, 15 and 20. I supported the
flat top of the delta just high enough so the bottom portion of the triangle,
also the feedpoint, was about 5 or 6 feet off the ground. I then used a
quarter wave matching section using 75ohm coax. Each quarter wave matching
section went to a remote coax switch, then one common feedline came into the
shack. I used the Ameritron 4 position switch so I didn't need to have a
control line.
I realize your not going hang the loops outside, but wanted to pass on my
experience on how I fed my loops. If you use the gamma matches just take a
jumper from each antenna to the switch.
GL
Bill Coleman AA4LR wrote:
> I recently put up an attic-mounted delta loop for 10m. It worked well
> enough that I'd like to supplement it with similar loops for 15 and 20
> meters.
>
> My loop is gamma-match fed. One problem is that I really don't want three
> feedlines coming out of the attic, I'd like to use just one.
>
> Typically, most quads or delta loops use separate feedlines. Can anyone
> explain why I couldn't use a combined feedline for delta loops? Thanks.
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@radio.org
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
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