Here is nice summary of g5rv antenna properties:
http://www.midtel.net/~pmam/g5rv.htm
73,
Mike ab3ap
On 11/08/2012 10:35 PM, Jim Wiley wrote:
It is my understanding that the original G5RV design is a 20-meter only
antenna. If built according to the designer's specification, meaning
Thanks for your insight on this. I had no idea the SWR would be so high on
the G5RV although I was aware of these characteristics in general.
I just did some checks across 20 meters and I get a SWR of 4 on the W2. The
chart you sent indicates 2+ but not sure if I should expect that. This is a
Hello Don,
Three questions:
Are both of your W2 and Antenna Analyzer powered from a PSU or a battery?
Do you have any form of common mode choke installed at the junction of the
coax and open wire feeders, or elsewhere along the coax?
Does the SWR reported by your W2 change at all (on any or
Hi Geoff,
The W2 is powered from shack supply, Astron RS-20. The MJF-259 from fresh AA
batteries. K3 also on shack supply. K2 on internal battery.
The coax is connected to the balun at end of ladder line as supplied by W8AMZ,
nothing else.
The coax is passed thru a polyphaser at the
On 11/09/2012 06:46 AM, Don KA1KU wrote:
Lastly, about the power reading of the W2. With power set at 5.0 on K2/K3
the W2 reads 8 and 10 respectively. With power at 10.0 the W2 reads 15 and
17. This seems like a lot of difference. Could it be the K's are that much
out of calibration? Is
Don -
A 50-ohm directional wattmeter can only read correctly when it is
connected to a 50-ohm source and a 50-ohm load. Anything else will
change the readings. For example: Suppose you have a 10-watt
transmitter that feeds an antenna that has a SWR of 3:1. That means
about 2 watts will be
Hi Don,
Thanks for your reply. According to the EZNEC and TLW programs, on 20m you
should be seeing the following SWR values at the shack end of the coax. I
have also shown the total loss of the 450 ohm ladder line and the coax, but
not the insertion loss of the 1:1 balun. For this exercise
I built a new W2 today and added the coupler in-line with my G5RV, which
recently replaced a 40M dipole.
Both my K2 and K3 have internal tuners, and I understand that the internal
tuners match inside the K's and cannot change the antenna so therefore can
not effect the SWR seen by the W2.
My MFJ
It is my understanding that the original G5RV design is a 20-meter only
antenna. If built according to the designer's specification, meaning
antenna length, feed line length, height above ground, etc. it should
show a reasonably low SWR on 20 meters. Many hams use it on other bands
with a
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