Topband: dipole height

[Jim Bennett]

I can second that - I was trying to get an 80 meter inverter L with FCP working this past spring and the measurements I got with my MFJ-259B were really whacky. Working with K2AV we realized that my ground-mounted Hustler 5BTV (80 - 10 meters) was reacting with the Inverted L. I lowered the 5BTV and the "L" resonance got to where it was supposed to. :-) I since removed the 80 meter part of that 5BTV and now use the "L" exclusively on 80.

JIm / W6JHB


On   Tuesday, Oct 30, 2012, at  Tuesday, 1:33 PM, Rick Karlquist wrote:

> N4IS wrote:
>> Hi Rick
>>>> 
>> I had full size 160M dipoles (not inverted vees) up at 9 meters and
>> 18 meters for about six months and did a lot of A/B'ing of them.
>> On receive, there was never any difference in audible S/N ratio.
>>>> 
>> 
>> This result is 100% sure to happen. Any time you have more than one
>> resonant
>> antenna, they will couple with each other. A-B test on 160m is very
>> difficult to be done properly when one antenna is resonant. There is
> 
> I am well aware of this, which is why I put relays at the feed points
> to open up the dipole that was not in use.  An isolated pair of 1/4
> wave wires has virtually no effect on a nearby dipole.
> 
> Rick N6RK
> 
> _______________________________________________
> Topband reflector - topband at contesting.com