Steve, Space the cage wire should at least 24 inches under the belief
that the fatter the structure appears at RF to be the more bandwidth
will be obtained. Also consider at a minimum a ground screen of rabbit
fencing around the base of your tower to reduce your ground loses which
are probably eating up 50% of your power as presently configured.
Herb, KV4FZ
On 12/5/2015 3:56 PM, wb6rse1@mac.com wrote:
Boxbe <https://www.boxbe.com/overview> This message is eligible for
Automatic Cleanup! (wb6rse1@mac.com) Add cleanup rule
<https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3DVSc7MfNPhA%252FzUK1%252BxNadKvzLWX3vQeEb8A%252FoYs5TaFKHqRkxdDdKs12%252BFrEIslNwFr4Eysy3jL747b3FKVa%252Bo%252FAefVFyRS77j8WVF0Vk7vXpfwHouw152rBxTYENw5HIOrIfWlF5HAM%253D%26key%3DOex6pS3CBve8TYCF2EhkTffuQAENI0GFBmIYgU%252FcT0E%253D&tc_serial=23546371068&tc_rand=1657742216&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001>
| More info
<http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=23546371068&tc_rand=1657742216&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001>
I shunt feed my 54 ft free standing 3 section crank-up tower for 160m and 80m,
remote relay band switchable omega match. 2:1 SWR bandwidth is around 40+ kc on
160 and about 20 kc on 80.
3/8” solid gamma rod, 15” from a tower leg attached at about the 22 ft level,
the top of the bottom section of the tower. These parameters will not change nor will the
fact that I have no radials since there is no place for them on my small city lot. There are
two 8 ft ground rods at the tower base.
If I were to put a cage of 2, 3 or 4 wires around the gamma rod, each spaced 3 inches
or so from the rod, could I expect to see a significant improvement in bandwidth on
80m? Or I won’t know until I try it?
Tks - Steve WB6RSE
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|