On Feb 23, 12:40 am, "Sal M. Onella"
wrote:
wrote in message

ups.com...





On Feb 22, 12:16 am, "Sal M. Onella"
wrote:
It was a bust. :-(

They can be quirky..And the decoupling is pretty critical. I always
preferred
a base fed half wave for those reasons. You still need to decouple for
best
performance, but there are no "coax in the way" issues, etc.. I use a
simple
"gamma loop" feed. IE: single turn coil, and a cap if needed.
Sometimes
you don't need the cap, but if you do, 30-50 pf is about the usual
value for
10m. I make those from a short length of coax.. I'm basically copying
the
feed system of the usual cushcraft ringos.. BTW, cushcraft sells a 10m
ringo if one doesn't want to build one, or have the tubing.

I will try decoupling and also try that feed.

I have several commercial antennas but I tend toward building them myelf. I
learned the hard way about the three types of copper pipe, K, L, & M. Until
I got home and hit google.com, I didn't know to shop for the more economical
Type M and paid premium $$$ for Type L. I don't want to think what Type K
would have cost.

"Sal"- Hide quoted text -

- Show quoted text -

Sal, I would like to know how it works with the PVC as I have tried it
on exactly this type of antenna and it worked horribly. Apparently the
PVC I was using has some really lousy dielectric qualities, This stuff
would melt in a microwave while other PVC pipes do not.. I understand
that all PVC is not created equally and that some may be OK. To get
mine to work I used larger pipe, smaller coax, and a different
insulating material but my original was identical to your first
attempt. Unfortunately for me I made all the changes at once and
really dont know which fixed the problem except that the PVC was an
issue. I am very interested in finding whether or not just adding the
choke fixed the problem because this is also something I forgot to do
on my intial attempt. Second attempt had one of those chokes from
"Wireman" made of a length of coax and ferrite beads. One thing that
concerned me even after the antenna was working is the the SWR
appeared to be a little too good. It was 1.2:1 in the middle of 10
meters and never got ave 1.7:1 even at the band edges. I thought that
this is a little too good to be true..

Jimmie