Parasitic vertical array needs MORE radials than phased one! With
quarterwave space between both verticals it would be better to phase them!
73,
Mirko, S57AD
S, Gene Fuller piše:
> 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
>> _______________________________________________
>>
>>
>>
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