Elevated radials will do more by establishing a fixed array configuration on
match and pattern. The orientation of the ground is another issue but with a
fixed orientation the pattern will be more subtle. I run multiple antennas
with vertical orientation and find that the ground conductivity has more to
change the pattern than the radials. That said, look at the ground
conductivity in your area and see if it is constant over a year or widely wet
to dry. If the ground is highly variable, the elevated radials will help give
you a more stable operating platform or match.
Mel, K6KBE
From: John Langdon <[email protected]>
To: 'Craig Smith' <[email protected]>; "'Dauer, Edward'"
<[email protected]>
Cc: [email protected]
Sent: Tuesday, July 12, 2016 6:36 PM
Subject: Re: [Elecraft] Sloping Terrain vs Feedline Losses
The elevated radials should help reduce near field I2R losses, but the sloping
terrain will help far field reinforcement and produce 'gain' in some
directions, although at 80M it should slope for further than a mile away to
really make a difference. I do not think elevated radials will change the far
field reflections from the sloping terrain in any way.
At 80M, even small hardline should have very low loss, so I would go for the
location that has the better terrain profile.
73 John N5CQ
-----Original Message-----
From: Elecraft [mailto:[email protected]] On Behalf Of Craig
Smith
Sent: Tuesday, July 12, 2016 5:50 PM
To: Dauer, Edward <[email protected]>
Cc: [email protected]
Subject: Re: [Elecraft] Sloping Terrain vs Feedline Losses
Ted …
I think you are overstating the coax losses. Even stock RG-11 should be
perhaps 0.3 dB/100ft on 80 meters - around 1.5 dB for the 500 ft. run.
Even so, I would probably gravitate toward the closer location. With the
elevated radials, the effects of the ground conductivity should be minimal.
Not sure if ON4UNs data assume elevated radials or many on-ground radials. It
could be that his estimate of the sloping ground advantage is for the later.
With the closer location, you will have perhaps 1 dB stronger signal in all
directions because of the lower feedline loss.
73 Craig AC0DS
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