View Single Post
  #7   Report Post  
Old February 23rd 07, 05:40 AM posted to rec.radio.amateur.antenna
Sal M. Onella Sal M. Onella is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 442
Default I Built the 10m Sleeve Antenna


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"