[Elecraft] Sloping Terrain vs Feedline Losses

[Mel Farrer]

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 <jlangdon1 at austin.rr.com>
 To: 'Craig Smith' <craig at powersmith.net>; "'Dauer, Edward'" <edauer at law.du.edu> 
Cc: elecraft at mailman.qth.net
 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:elecraft-bounces at mailman.qth.net] On Behalf Of Craig Smith
Sent: Tuesday, July 12, 2016 5:50 PM
To: Dauer, Edward <edauer at law.du.edu>
Cc: elecraft at mailman.qth.net
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

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html Message delivered to jlangdon1 at austin.rr.com

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to farrerfolks at yahoo.com