I would like some advice of using my crank up US Tower pole as an antenna for
160. The pole is mounted on top of a concrete block that has 4 threaded iron
rods on which the pole is set . the block is 5 feet deep.
Does the concrete block insulate the pole from ground?
>From each of the 4 rods from the base I have a #8 copper wire to an 8 foot
>copper clad ground rods. There is also a 30 foot copper tubing that is sunk
>vertically into the ground. I start getting water at about 10 feet.
So any ideas as of what to in this situation. Best 73 John NS5Z
Sent from my iPhone
On Sep 27, 2011, at 2:00 PM, topband-request@contesting.com wrote:
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> Today's Topics:
>
> 1. Re: Effect of current max not at base of vertical. (Pete W2PM)
> 2. Re: Effect of current max not at base of vertical (Pete W2PM)
> 3. Re: 4W6A (ik4gme)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 26 Sep 2011 20:12:26 -0400 (EDT)
> From: Pete W2PM <w2pm@aol.com>
> Subject: Re: Topband: Effect of current max not at base of vertical.
> To: zr@jeremy.mv.com, olinger@bellsouth.net
> Cc: topband@contesting.com, herbs@vitelcom.net
> Message-ID: <8CE4AC145B2FC2D-1330-5E99F@webmail-d180.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
> 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 <zr@jeremy.mv.com>
> To: Guy Olinger K2AV <olinger@bellsouth.net>
> Cc: topband <topband@contesting.com>; herbs <herbs@vitelcom.net>
> 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: herbs@vitelcom.net ; topband@contesting.com
> 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 <zr@jeremy.mv.com> 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.
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> ______________________________________________
> R RST IS ... ... ..9 QSB QSB - hw? BK
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 26 Sep 2011 20:17:03 -0400 (EDT)
> From: Pete W2PM <w2pm@aol.com>
> Subject: Re: Topband: Effect of current max not at base of vertical
> To: W9UCW@aol.com, topband@contesting.com
> Message-ID: <8CE4AC1EA776E65-1330-5EAE7@webmail-d180.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
> I onvce did a observational study like this with W2JPW who lives 3 miles from
> my QTH. We did the test on all bands from 160 to 2 meters using zero gain
> omni directional antennas. On 160, with 1500W he was S5. On 80 S9 plus, On
> 40 S4, and moderately strong on higher bands except for 17meters where he was
> very weak. All the time we were in QSO on a 2 meter 1.5W portable in each of
> our basements with rubber antennas. Full quieting each way. By the way on
> the weak bands he had no issues with QSO success on them so there wasnt
> anything inherently bad about his system.
>
>
> Pete W2PM
>
>
>
> -----Original Message-----
> From: W9UCW <W9UCW@aol.com>
> To: topband <topband@contesting.com>
> Sent: Sat, Sep 24, 2011 11:35 pm
> Subject: Re: Topband: Effect of current max not at base of vertical
>
>
> This may or may not be significant to the discussion. In the 1970's I was
> sing a 120 foot insulated base vertical as my main transmit antenna. I had
> 2,000 feet of #12 copper radials from 90 to 200 feet in length buried
> bout 3 inches in the ground surrounding the antenna. It was located near
> inooka, Illinois in a wooded rural area.
>
> s an experiment, I asked several friends who were located from one to
> welve miles away to record my signal strength at their location each day for
> ne month at a specific power of 100 watts of carrier. Then I had my tower
> limbing buddy, Jack, W9YF (SK) put a resonator tuned to 1850 on top of the
> ertical.
>
> had to modify the base matching system. It had been a shunt coil to
> round. It now required a parallel resonant circuit from the base of the
> tower
> o ground with the coax from the rig tapped onto the coil.
>
> hen my friends reported the signal strength they now recorded, it was
> rom a half to a full "S" unit more than their original readings. Now that's
> ertainly not very scientific, but their comments, assuming all groundwave
> eadings, were sure interesting to me.
>
> 3, CU on TopBand, Barry, W9UCW
> ______________________________________________
> R RST IS ... ... ..9 QSB QSB - hw? BK
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 27 Sep 2011 10:57:12 +0200
> From: "ik4gme" <ik4gme@libero.it>
> Subject: Re: Topband: 4W6A
> To: <topband@contesting.com>
> Message-ID: <4396B1A15D704EBCA19080870EC6442E@ballardi7a1c95>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> ......and judging by the response, an excellent showing was made on 160M.
> Thanks once again..
> Kev
> M0TNX
> Assistant QSL manager/web admin
>
>
>
> Just out of curiosity, I'd like to read lots of comments from the other
> European topbanders .
>
> 73 John IK4GME
>
>
>
> ------------------------------
>
> _______________________________________________
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>
> End of Topband Digest, Vol 105, Issue 29
> ****************************************
>
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|