Re signal improvements when over fresh water or swamp I've notice that many times on VHF or FM radio in the car and always simply suspected the effects of being in the clear without obstructions like buildings and trees.
Pete W2PM -----Original Message----- From: ZR <[email protected]> To: Guy Olinger K2AV <[email protected]> Cc: topband <[email protected]>; herbs <[email protected]> Sent: Sat, Sep 24, 2011 11:35 pm Subject: Re: Topband: Effect of current max not at base of vertical. Well, Im on top of a pine and oak covered hill these days and RF ground esistance tests say it aint so hot; about 250 Ohms for the Beverages. There is bout 8-10" of compost and then very bony soil to an average of 18" before solid ock. Now, the rock what locals call rotten granite as it just flakes off, is ikely due to a high iron content which also affects well water around here. Maybe I should try drilling deep into the rock and pounding down a copper clad od that is slightly larger diameter. I still remember driving around when much younger how suddenly the AM BCB would ave much increased signal strengths for a short distance and there was nothing isible in the area to account for it. Crossing over a large area of fresh water r swamp always peaked signals even when the road wasnt elevated. Answers are needed. Carl M1H ----- Original Message ----- From: Guy Olinger K2AV To: ZR Cc: [email protected] ; [email protected] Sent: Saturday, September 24, 2011 3:30 PM Subject: Re: Topband: Effect of current max not at base of vertical. EZNEC's "fresh water" selection shows a conductivity of .001 (very nconductive). So it's talking about Great Lakes fresh water away from urban olution. Question would be how conductive the swamp water is. I would ersonally guess that if the area is heavily vegetated and slow draining, the onductivity would be higher due to dissolved compounds produced by submerged otting vegetation. Anybody care to go out in the middle of your local freshwater swamp and stick hmmeter probes down there? The conductivity may even be layered, since the ater with dissolved materials will weigh more and the more fresh will lay on op. If really stinky "fresh" water marsh is as conductive as that super-rich idwest pastoral soil we keep hearing about, it jumps up to the best of on-salt-water results. How conductive is YOUR local fresh water swamp. 73, Guy PS, this also applies to fairly acidic recently wet down pine straw forest loors, like those down in flat land Carolina loblolly or oak forests. Would ary incredibly depending on whether dry or not, or well drained with acid eached out. On Sat, Sep 24, 2011 at 11:29 AM, ZR <[email protected]> wrote: Ive doubted some of the claims about fresh water swamps based only on ersonal experience. At a prior QTH I had them on 2 sides and extending to a ile or more and the 160 vertical "appeared" to play better then expected. All that rotting vegetation had to be good for something and it rarely froze ore than a few inches in the winter. Carl KM1H ------------------------------------------------------------------------------ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1410 / Virus Database: 1520/3917 - Release Date: 09/24/11 ______________________________________________ R RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
