On Monday, November 17, 2014 7:07:49 AM UTC-6, Jeff wrote:
On 17/11/2014 08:37, gareth wrote:
wrote in message
...
On Sunday, November 16, 2014 4:47:35 PM UTC-6, gareth wrote:
wrote in message
...
It's quite easy. Just ditch the designed for 20m feed system and
replace it with something more suitable for 75m.

But the 102 ft top together with the 34 ft ladder is designed for 3.5MHz!

Not exactly.. It's a bit long when used as the makeup section
on 75m. But I believe it's the use of the chokes which cause the
losses many people see.

The G5RV design has no chokes.

All the commercial versions I've ever seen had one. If they didn't
come with one, they recommended adding one of the users choosing.
The pathetic version I once tried sure had one, and I'm fairly sure
it was the reason for the poor performance. No other way to explain it
really.. It sure wasn't the radiator, ladder line, or coax.. :|






Strange then that G5RV himself suggested the use of one consisting of 8
to 10 turns of the feeder cable!!!

Jeff

He actually recommended a choke in his first designs, but after later
testing, decided it was usually best not to use one. Some thinks it's
best to use one, others don't.. User preference I suppose. Most do use
one it seems.