Ted:
On my 64 foot tower I've got a shunt feed for 160M and a
half-sloper wire (1/4 WL) for 80M on adjacent faces. They're not both
shunt feeds, I realize, but this should give you some reassurance that
you can use your tower as a radiating element on separate bands. I
don't run an amp here so my series cap for 160M is a bread slicer
variable in a plastic show box-like container.
Good luck and let us know how it all turns out for you.
73 de
Gene Smar AD3F
On 6/13/2021 9:16 PM, K9MA wrote:
I've been doing that for decades. It's a 70 foot tower with a JK
Mid-Tri near the top, a D40 6 feet above it, and a JK CS3-JK on a
sidearm at about 50 feet. There are two gamma matches on opposite
sides of the tower. The 80 meter side has a second piece of tubing in
parallel most of the way up to reduce the inductance, Q, and peak
voltage. There are variable capacitors at the base of the tower, with
a relay to switch between bands.) I can provide more details offline
in a week or so.
http://sdellington.us/hr/Tower%202019/Blog/Photos/Gamma1.jpg
<http://sdellington.us/hr/Tower%202019/Blog/Photos/Gamma1.jpg>
(There are a bunch of ropes in the photo, but the near side is 80
meters.)
http://sdellington.us/hr/Tower%202019/Blog/Photos/Tuner2.jpg
<http://sdellington.us/hr/Tower%202019/Blog/Photos/Tuner2.jpg>
73,
Scott K9MA
On 6/13/2021 5:30 PM, k8na wrote:
I am putting up a new tower. I want to have 80m shunt and 160m shunt
mounted on the same tower. Does anyone have any experience doing
this? What problems? The tower is a 60ft-er with 12ft of mast and a
Mosley PRO C-67-3, 4el 6m yagi, and 2m/440 vertical.
TU/73 ... de Ted K8NA
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