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On Wed, Mar 6, 2024, 12:01 PM <[email protected]> wrote: > Send Topband mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.contesting.com/mailman/listinfo/topband > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Topband digest..." > > > Today's Topics: > > 1. Re: Water tables ([email protected]) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 05 Mar 2024 19:34:38 +0000 > From: [email protected] > To: "'[email protected]'" <[email protected]> > Subject: Re: Topband: Water tables > Message-ID: <c931cd6bb0220f383126e5c52a9637f82b6e9c0f@webmail> > Content-Type: text/plain; charset=UTF-8 > > I live surrounded by central Ohio farmland, and my well (for drinking > water) is 300 ft deep. My soil is mostly clay, and I have had trees > die from too much water. When I dug them up, the hole filled with > water. > > So I believe that while a high water table /oceanfront/island > locations are outstanding places to operate vertical antennas. your > local soil conditions are a bit more complex, but can still produce > high ground water levels. > > W3HKK uses a 1/4 wave INV-L with 26 radials of assorted lengths ( due > to property line issues) and consisting of anything from #17 Al fence > wire to #12 solid or stranded copper wire) and a single tree that > decided to grow, about 35 ft from one PL) > > Somehow Ive had really good success on TB, considering the top of the > L's vertical leg is a relatively modest 52 ft. > > Back to my soil: we have three acres, but with only 3-6" of real top > soil, above multiple layers of clay. BUT the clay, being on a > hillside, tends to serve as a pipeline, to keep my soil moist and the > grass green even in summer. ( As it takes many months for the moisture > uphill from my antennas to drain off . ) > > My first year at this qth ( some 15 yrs ago) I put up a 1/4 wave INV-L > over top of a small walnut tree, which limited the apex to a mere 15 > ft!. ...... 15 ft up and 115 ft sloping down to ground level. 325 ft > of coax fed the antenna directly, with an swr at 1.1:1, against a > single 8 ft ground rod and zero radials. I ran 100w at the time and > had no idea what to expect from 160m. So imagine my surprise when one > night in Dec I heard a loud 4X4, and then an LZ. Both came back to my > calls. A month or so later I was on around sunrise and heard a fairly > loud JA CQing. Again to my surprise he came back and we had a > successful qso. > > So with 100w and a 15 ft high INVL, I worked LZ, 4X4, and JA as the > crown jewels of my first winter on TopBand. The TB bug had bitten! > > Again, with zero radials and a single ground rod! I thought that was > remarkable, and credit average to good soil conductivity. I couldnt > help but recall all the rock and roll AM radio stations I listened to > as a kid that arent very far away in frequency from 160m. > > From those old FCC ground resistance charts of US soil, it looks like > Im in an "average" soil conductivity area. Possibly aided by a 2 acre > pond directly across the street, and a meandering creek passing just > east of my PL, my soil conductivity seems to be average+! > > Over the years, as the tree grew I raised the support mast lashed to > it, higher and higher, til it maxed out at 52 ft. Those mil surplus > 2.5"x 4ft aluminum and fiberglass mast sections became too unstable > beyond that height, so I used three guy ropes and the INV-L - plus the > tree to hold it in place. Ten years later its still standing. MY TB > DXCC is 182 worked/164 confirmed. > > So I keep chasing "The Adventures of George" as he sails from place to > place! :) Thanks George! I know it isnt all sunshine and smooth seas! > But we appreciate knowing your out there listening for us! Plan to > write a book? You should. > > Bob > W3HKK > > -----------------------------------------From: > [email protected] > To: [email protected] > Cc: > Sent: Tuesday March 5 2024 12:05:44PM > Subject: Topband Digest, Vol 255, Issue 5 > > Send Topband mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.contesting.com/mailman/listinfo/topband > /> or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Topband digest..." > > Today's Topics: > > 1. [TowerTalk] New N6LF Ground Probe Designs (Roger Kennedy) > 2. Re: [TowerTalk] New N6LF Ground Probe Designs (GEORGE WALLNER) > 3. Re: [TowerTalk] New N6LF Ground Probe Designs (Steve Harrison) > 4. Re: Top Band Conditions, Mar. 4, 2024 (Rob Van Geen) > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 4 Mar 2024 18:11:34 -0000 > From: "Roger Kennedy" > To: > Subject: Topband: [TowerTalk] New N6LF Ground Probe Designs > Message-ID: > Content-Type: text/plain; charset="us-ascii" > > But what is GOOD Ground for RF? > > I've always presumed that the reason I do so well for DX with a > horizontal > 160m Dipole is because the Ground conductivity is POOR . . . so my > Dipole is > effectively a lot higher. > > Plus I have always wondered how deep below the surface the ground > matters, > when it comes to RF. (and especially on Top band, where the > wavelength is so > long) > > For these reasons I've always been very sceptical about Computer > Modelling > of a low Dipole on 160m. > > Roger G3YRO > > ------------------------------ > > Message: 2 > Date: Mon, 04 Mar 2024 13:48:45 -0500 > From: "GEORGE WALLNER" > To: "Roger Kennedy" , > [email protected] > Subject: Re: Topband: [TowerTalk] New N6LF Ground Probe Designs > Message-ID: > Content-Type: text/plain; charset="utf-8"; format="flowed" > > Salt water, salt marshes, alkaline soil, soil with a high water-table > should > be good. > George > > On Mon, 4 Mar 2024 18:11:34 -0000 "Roger Kennedy" wrote: > >But what is GOOD Ground for RF? > > > >I've always presumed that the reason I do so well for DX with a > horizontal > >160m Dipole is because the Ground conductivity is POOR . . . so my > Dipole is > >effectively a lot higher. > > > >Plus I have always wondered how deep below the surface the ground > matters, > >when it comes to RF. (and especially on Top band, where the > wavelength is so > >long) > > > >For these reasons I've always been very sceptical about Computer > Modelling > >of a low Dipole on 160m. > > > >Roger G3YRO > > > > > >_________________ > >Searchable Archives: > >http://www.contesting.com/_topband > /> > - Topband Reflector > > > > ------------------------------ > > Message: 3 > Date: Mon, 4 Mar 2024 11:17:31 -0800 > From: Steve Harrison > To: [email protected] > Subject: Re: Topband: [TowerTalk] New N6LF Ground Probe Designs > Message-ID: > Content-Type: text/plain; charset=UTF-8; format=flowed > > On 3/4/2024 10:48 AM, GEORGE WALLNER wrote: > > Salt water, salt marshes, alkaline soil, soil with a high > water-table > > should be good. > > What could be considered a "high water table"?? My water table is > maybe > 110 - 120 feet down; but if it were shallower, like maybe 30 feet, I > might be concerned about the soil over it not being "stiff" enough to > rigidly-support a free-standing tower's pedestal dug down some 8 - 10 > feet 8-O > > Steve, K0XP > > ------------------------------ > > Message: 4 > Date: Mon, 4 Mar 2024 21:26:24 -1000 > From: Rob Van Geen > To: Steve Harrison > Cc: [email protected] > Subject: Re: Topband: Top Band Conditions, Mar. 4, 2024 > Message-ID: > > Content-Type: text/plain; charset="UTF-8" > > Hi, Steve > I enjoyed reading your QRZ bio.. Raising "antlers" on your desert > "spread". > I love it! > > JN1ILK seems to do a pretty good job at spotting 160 DX around > Oceania: > > https://www.reversebeacon.net/main.php?zoom=41.95,156.11,0.80&rows=100&max_age=10,months&bands=160&modes=cw&spot_types=1&spotter_call=JN1ILK&continent_dx=OC&hide=distance_mi,map > /> > 73 & GUD DX! > Aloha > Rob - NH6V > > On Mon, Mar 4, 2024 at 4:39?AM Steve Harrison wrote: > > > 9M2AX was heard here very weakly this morning starting about 1345Z, > > until about 1405Z, the last time I heard him CQ. My sunrise > occurred > > precisely at 1412Z. I began calling him about 1405Z but never heard > him > > again. > > > > Was hoping H40WA would use this last day on Temotu to appear on > 160M CW; > > but zilch heard here, or seen on the spotting net other than 80m CW > > activity. > > > > Have not heard 9M6/DJ2EH since early last week; he was spotted at > least > > once this past weekend on one of the WARC bands, so is apparently > still > > there. Does anybody know his schedule for remaining in 9M6, or his > > operating schedule? I tried e-mailing but his e-mail addy on > QRZ.com > > bounces. > > > > Am also still looking for DU7ET but haven't heard him since > mid-January, > > when he was very weak. I know he's been worked in Europe over the > past > > month or so, but just hasn't caught conditions good enough for the > west > > coast of NA. Robert does respond to his e-mail, however. He said he > has > > two locations: one on a west-facing beach that favors Europe, and > > another in the mountains which he says has a better shot to NA, VK > and ZL. > > > > 73, > > > > Steve K0XP > > > > See my QRZ.com page at *https://www.qrz.com/db/K0XP* > /> > _________________ > > Searchable Archives: http://www.contesting.com/_topband [1] - > Topband > > Reflector > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Topband mailing list > [email protected] > http://lists.contesting.com/mailman/listinfo/topband > /> > > ------------------------------ > > End of Topband Digest, Vol 255, Issue 5 > *************************************** > > > Links: > ------ > [1] http://www.contesting.com/_topband > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Topband mailing list > [email protected] > http://lists.contesting.com/mailman/listinfo/topband > > > ------------------------------ > > End of Topband Digest, Vol 255, Issue 6 > *************************************** > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
