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Author Topic: G5RV LITE v. g5rv....more for portable use.....  (Read 3325 times)
KC9RCG
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Posts: 142




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« on: October 16, 2012, 11:14:18 AM »

I currently use a g5rv at home. But, for camping and outdoor use, do you see a g5rv lite less efficient? thoughts?

Basically, will I see a big difference?

thanks
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W5DXP
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Posts: 3590


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« Reply #1 on: October 16, 2012, 12:17:46 PM »

I currently use a g5rv at home. But, for camping and outdoor use, do you see a g5rv lite less efficient?

The g5rv-lite is not a g5rv at all. It is just a marketing gimmick. A g5rv is a 1.5WL dipole fed with 1/2WL of twinlead. The g5rv-lite is a 40m dipole fed with slightly less than 1/2WL of twinlead. I wouldn't recommend using coax with a g5rv-lite except on 15m and 12m since the SWR on the coax on all other bands is greater than 20:1.
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73, Cecil, www.w5dxp.com
The purpose of an antenna tuner is to increase the current through the radiation resistance at the antenna to the maximum available magnitude resulting in a radiated power of I2(RRAD) from the antenna.
KC9RCG
Member

Posts: 142




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« Reply #2 on: October 16, 2012, 12:25:52 PM »

It sounds as if I'm going to lose on that.

Here is what I was looking at....

http://www.shop.radiowavz.com/G5RV-Lite-80m-6m-G5RVLITE.htm
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KQ6Q
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Posts: 979




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« Reply #3 on: October 16, 2012, 04:19:41 PM »

go with resonant dipoles -just pick the bands you'll use, and have precut dipoles ready to string up.
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WB6BYU
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Posts: 13288




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« Reply #4 on: October 16, 2012, 09:05:34 PM »

OK, now I know that antenna - basically as G5RV with coil loading to reduce the span
on 80m. Unfortunately the other bands don't line up as well as with the original, so you
will need a tuner, and coax losses will be more significant.  But then, you might not
be using a long piece of coax if you can operate from right below it.

Will you notice a difference?  Maybe not.  The ionospheric conditions vary much more
from one day to the next than the difference between the two antennas.  On some of
the higher bands it may work fairly well if your coax isn't too long.


What sort of portable operation are you imagining?  What sorts of supports do you
expect to have?  What bands do you use the most?

There are lots of different antennas, and some are more suitable for certain types
of portable operation than for others.  For operation over a few bands, it is hard
to beat resonant dipoles on a common feedpoint.  I carry a length of coax with
a center insulator attached and dipole wires for each band - that allows me
to customize it for different combinations of bands each time I set it up.  For
example, my standard setup was dipoles for 80 / 40 / 20 / 10m, with the 40m
dipole working on 15m, but occasionally I'd have a situation where I'd just put
on 20m for a sked, or 10m when an ideal branch allowed me to hang a vertical
dipole over salt water.  Most of these were set up for short operation - usually
overnight in a camp ground, occasionally a lunch stop while traveling.  By
pre-tuning the wires before I leave I don't need to carry a tuner.

Your campsites might not have suitable trees, or be too crowded to hand a
full 80m dipole, but that generally hasn't been a problem for me.  I have
had to get creative for supports on occasion.

For backpacking I focus on light weight:  RG-174 coax and #22 or #24 stranded,
insulated wire.  For car camping or Field Day I might use RG-58 and #18 wire.

This can get a bit more complex if you also want to operate the WARC bands.
For a longer stay (a week at a cabin, for example) I would consider a more
multi-band antenna with a tuner.  On Field Day I threw together a 40m dipole
fed with twinlead and it worked great on 40m through 10m with a tuner.  As
the antenna gets too long you have to consider the radiation patterns on the
higher bands, which is another reason for asking about your operating
preferences. 


Usually if I'm operating portable outdoors, I have enough space to string
a full sized dipole (even for 160m), in which case there is no reason to
use a shortened antenna.  But my operations aren't always typical of
what other hams encounter.
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