[SMCARA] What to expect from a G5RV....
Dave Q
quickskys at gmail.com
Mon Sep 22 18:33:25 EDT 2014
Gentlemen,
Thanks for all the info and help. I got the antenna up with the help of a
friend. We had to remove tree branches and cut several trees down to get a
clear path.
Center is at 45' with ends at 23' and 15'. Due to the slope of my property
the wire angles are different enough to be noticeable. The lower side of
the slope has a more acute angle. When the leaves fall I may be able to
measure the angles somehow.
I have a RigExpert AA-170. I took a measurement from the coax at the radio
which consists of 25' of RG-8 and 70' of LMR 400. Don't have the radio in
its final place thus the RG-8 jumper. Already had the coax to antenna
sealed so didn't take a reading with just the antenna.
I took a 300 point sample from 0 Mz to 170 Mz. I'm going to try to attach
the graph but don't know if the forum will allow. The graph has lightened
areas for the different bands but they are not labeled. In the software
you can cursor over the graph and it shows the frequency and SWR and a
bunch of other stuff which I have yet to learn. I cursored over the middle
of each lightened area and recorded frequency and SWR.
Freq SWR
1.700 12.98
3.400 2.73
7.367 1.44
10.200 9.10
14.167 1.45
18.133 1.30
20.967 5.26
24.933 1.08
28.900 1.55
50.433 2.34
145.067 2.92
Does it receive or transmit, haven't turned the radio on yet. It may be
all noise.
I'm going to attach a couple of pictures of the install. Only thing of
interest, at least to me, are the stand-offs and homemade window weights.
Again not sure if the forum allows attachments.
73
Dave - W3DLQ
On Mon, Sep 22, 2014 at 4:38 PM, Jason Rearick <jbr13 at md.metrocast.net>
wrote:
> Boz, I ran the antenna analyzer on mine this past weekend. This isn’t
> with calibrated equipment, just an MFJ analyzer.
>
> The configuration of my ZS6BKW is inverted vee, center up at 35 feet, and
> ends up at 8 feet. I have 5 feet of the ladder line that touches the
> ground, it comes down and makes a 90 deg bend at the ground. The
> ladderline attaches to 75 feet of LMR400 coax. With my MFJ-949E tuner I
> can tune 80M and 15M and have worked DX stations on all bands. I can
> operate on 40M, 20M, and 12M without a tuner and be under 2:1.(I usually
> tuner just to get it as low SWR as possible.
>
>
> BAND
> RES. FREQ
> NOTES
>
>
>
>
>
> 80M
> 3.503
> 5.6 SWR at 50 ohm
>
> 40M
> 7.080
> 1.0 SWR at 50 ohm
>
> 20M
> 14.079
> 1.0 at 50 ohm
>
> 17M
> 17.945
> 1.5 SWR at 50 ohm
>
> 15M
> 21.180
> 10.8 SWR at 50 ohms
>
> 12M
> 24.850
> 1.2 SWR at 45 ohm
>
> 10M
> 28.800
> 1.8 SWR at 60 ohm
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> From: Richard (KG3BOZ)
> Sent: Monday, September 22, 2014 3:49 PM
> To: jbr13 at md.metrocast.net ; smcara at mailman.qth.net ; William S Merritt
> Subject: Re: [SMCARA] What to expect from a G5RV....
>
> Thanks.
>
> I did read about this 'optimized' G5RV. I'd be interested to see some
> actual antenna measurements (with calibrated test equipment). I'm not sure
> I am ready to believe all of the claims on the website.
>
> Having said that, what really counts is whether the user enjoys the
> antenna performance. Everything else is academic.
>
>
> 73 DE KG3BOZ
>
>
>
> -------- Original message --------
> From: jbr13 at md.metrocast.net
> Date:09/22/2014 15:33 (GMT-05:00)
> To: smcara at mailman.qth.net, William S Merritt
> Subject: Re: [SMCARA] What to expect from a G5RV....
>
>
>
> BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; }
> Just so everyone knows, Dave is not working with a regular G5RV. He
> is using what is called a ZS6BKW G5RV, or an Optimized G5RV. Slightly
> different antenna, that was optimized by computer modeling off the
> original G5RV.
>
> You can see what it looks like at the bottom of this page, and under
> the regular G5RV. http://www.w8amz.com/W8AMZ_G5RV_Page.html [1]
>
> The ZS6BKW as I was optimized to be better than the original G5RV
> antenna, and is capable of operating on 10, 12, 17, 20 & 40m bands
> generally without a tuner, with SWR readings usually 1.5:1 or less.
> Using a tuner 6, 15, 30 & 80m bands with much higher efficiency then
> the original G5RV.
>
> I researched this antenna a good amount before I purchased it, and
> this is a .pdf that details a comparison between the G5RV and the
> ZS6BKW.
>
> www.w5ddl.org/files/ZS6BKW_vs_G5RV_20100221b.pdf [2]
>
> Just wanted to through this out here so everyone was on the same
> page antenna wise.
> Jason N3YUG
> On Mon 09/22/14 1:19 PM , William S Merritt merrittws at earthlink.net
> sent:
> Tom Rausch, W8JI, a noted engineer and designer of ham products
> discusses the G5RV...
> http://www.w8ji.com/g5rv_facts.htm [3]
> In particular he comments:
> "...The G5RV has a _reasonable SWR_ on 80, 40, 20, 15, and 12
> meters./It
> is not an acceptable performer on 30, 17, or 10 meters/.'
> and:
> "While the G5RV requires an antenna tuner, it is very efficient on
> at
> least 5 bands."
> --
> Bill Merritt
> KB4QAA/3
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> Links:
> ------
> [1] http://www.w8amz.com/W8AMZ_G5RV_Page.html
> [2] http://www.w5ddl.org/files/Zs6bkw_vs_G5rv_20100221b.pdf
> [3]
>
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> [4]
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