[TowerTalk] G5RV vs 40M dipole

[Roger (K8RI) on TT]

I have a 75 Meter fan.  Even with a 3' separation at the ends with the 
top near 90 feet and the lower end nearly in the trees. my neighbor on 
that side never noticed the "contraption"  Compared to thye tower the 
antennas are almost invisible.  Everything is relative.

For the nulti band why not use spreaders to form a triangle at the ends 
of the higher bands.  Even with a 6" separation if under tension they 
should not have adjacent wires touch.  Mine is probably under 50 to 60#. 
Maybe more.  The feed and multi core choke and LMR-400 feed line hang 
from the center with no noticable sag...So they may be under a bit more 
tension than I thought.  The top end is pulled up via 5/16ths dual core 
poly rope that goes through a heavy duty pulley near the top of the 
tower.  The rope then comes down the tower and is fastened at about the 
8' level.    I'll try to explain how I tighten it.

The rope runs inside the tower between several cross braces,  I grab the 
rope between  the braces with my left hand. the rope comes out under the 
lower cross brace.  I pull the rope out a foot or so with my left hand., 
then pull out most of the excess with my right hand.  as long as I keep 
tension on with both hands, the friction helps keep the rope from going 
back up the tower, so it looks like a seesaw movement between the hands 
with the left hand moving up the rope and winding the excess around my 
right.  It's easier to demonstrate than explain, but you can really put 
some tension on with this approach, or I could when my left hand still 
worked.


I still have the 100' 45G, but currently it only supports the ends of 3 
wire antennas.

73

Roger (K8RI)


On 4/25/2015 8:42 PM, Larry Loen wrote:
> Try both; experiments are cheap.  You can build both of this for maybe 50
> dollars for both of them.  I've never done the G5RV "junior"; results could
> be interesting.
>
> I think on the whole the fan dipole will probably outperform the junior,
> based on my observations of how the full sized G5RV performs, though.
>
> The main thing with the fan dipole, especially in a one man assemble and
> deploy, is to make very sure the wires don't cross.  A modest bit of PVC
> pipe at the 10 meter end will ensure this if your neighbors can stand the
> "visuals".  Otherwise, it can be tough to avoid at least one "crossover"
> near the feed point, which I do not recommend based on my own doleful
> experiences.
>
>
> WO7R
>
> On Sat, Apr 25, 2015 at 5:10 PM, Bry Carling <bcarling at cfl.rr.com> wrote:
>
>> I'm not a fan of fan dipoles. G5RV all the way!
>>
>> Best regards - Brian Carling
>> AF4K Crystals Co.
>> 117 Sterling Pine St.
>> Sanford, FL 32773
>>
>> Tel: +USA 321-262-5471
>>
>>
>>
>>
>>> On Apr 25, 2015, at 5:43 PM, Jim Brown <jim at audiosystemsgroup.com>
>> wrote:
>>>> On Sat,4/25/2015 1:50 PM, Wes Attaway (N5WA) wrote:
>>>> Without getting into a never-ending discussion of "which antenna is
>> best", I would suggest that you consider just dropping 3 or 4 feet of each
>> end straight down so that the remaining horizontal length will fit in your
>> available space.
>>> Yes, that's your best option.
>>>
>>> If you want more bands, consider building a fan dipole for 20, 30, and
>> 40 and feed it with 50 ohm coax. With a tuner, it will also work on 15M.
>>> See k9yc.com/publish.htm  for ideas. Study Antennas For Limited Space.
>>>
>>> 73, Jim K9YC
>>> _______________________________________________
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>>>
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-- 

73

Roger (K8RI)


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