Hi Dick -
If it's not effecting the SWR then it's not coupling into the DE and won't
do anytrhing for you.Don't forget that the parasitic relector will need
radials, just like the driven element. I would try to get a minimum of 3 or
4.
Gene / W2LU
----- Original Message -----
From: <RLVZ@aol.com>
To: <towertalk@contesting.com>
Sent: Saturday, February 12, 2011 2:20 PM
Subject: [TowerTalk] Adding reflector to 40-m. vertical - Update
> Hi Guys,
>
> Thank You for the many replies... I appreciate it!
>
> Update: Gene and another ham replied that I could simply add the
> reflector
> and NOT connect it to the driven element or the transmission line. Since
> time is short before tonights CQWW-RTTY contest... that's the
> installation
> method I used. The spacing probably isn't optimum as I had to mount the
> reflector 35' behind the driven element. (it's on a dock and that's the
> only
> available mounting place). But the reflector is SW of the DE so at
> least
> the 2-element vertical should be beaming NE (Europe) which was my goal.
> I expected SWR to change with this setup but that was no change in SWR.
> Perhaps my reflector is too long at 35'6" ... do you think I should
> shorten
> the reflector or leave it as-is?
>
> I'll post a reply tomorrow and let you know if I noticed any difference
> in
> Gain or F/B.
>
> 73,
> Dick- K9OM/4
>
>
>
> Dick -
>
> If "easy"is important, it might be easier to just put up a parasitiec
> reflector. Resonate at 6.7-6.8 MHZ and place about 25 feet behind your
> present vertical. It will affect your SWR but if your Xmtr will tune ok
> and
> your feed line isn't too long ( lossy) you should be good to go. Without
> a
> lot of fuss your gain and f/b should be about the same as driven two
> element.
>
> Gene
>
>
> ----- Original Message -----
> Subject: [TowerTalk] Adding reflector to 40-meter vertical
>
>
>> Hi Guys,
>>
>> I've got a ground mounted 1/4 wave 40-meter vertical located at the edge
>> of a saltwater river. Before sunset tonight, I want to add a 1/4 wave
>> reflector behind it to add a little more gain towards Europe. (a fun
>> little experiment) I'm only looking for one direction with this
> antenna:
>> towards Europe... so I'll be end firing it NE with the reflector to the
> SW of the
>> driven element.
>>
>> A couple quick questions:
>>
>> 1) Should I locate the reflector 1/4 wave (33') behind the driven
>> element
>> or is there a better distance to use for a simple and quick setup?
>>
>> 2) I'm looking for the simplest method of feeding these antennas as I
> have
>> limited parts at this temporary location: a T-connector and coax!
>> Would
>> the use of a UHF T-Connector and then individual feedlines to each of
> the
>> > verticals be the quickest way to connect them? If so, any
>> recommendations or feedline lengths?
>>
>> Thanks!
>>
>> Dick- K9OM/4
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|