you have high ground losses, and you need a better ground. the more radials
you put down you will cut losses and the bandwidth will narrow.
73 jim wi9wi
At 06:36 PM 8/20/2002 -0400, you wrote:
>Send Towertalk mailing list submissions to
> towertalk@contesting.com
>
>To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.contesting.com/mailman/listinfo/towertalk
>or, via email, send a message with subject or body 'help' to
> towertalk-request@contesting.com
>
>You can reach the person managing the list at
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>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Towertalk digest..."
>
>
>Today's Topics:
>
> 1. Inverted L update (FireBrick)
> 2. Tower design (Martin Sole)
> 3. Sidemount concerns (Rob Atkinson, K5UJ)
> 4. AB-577/GRC Surplus Mast (Willie Peloquin)
> 5. Re: AB-577/GRC Surplus Mast (Kevin Adam)
> 6. RE: AB-577/GRC Surplus Mast (Dale L Martin)
> 7. RE: AB-577/GRC Surplus Mast (Jim Shaw)
> 8. Re: At least TIME magazine responded (David)
> 9. Antenna Restrictions (Tom Anderson)
> 10. McMaster-Carr Fiberglass Rod (Mark Beckwith)
> 11. ICE Rotator cable lightning protector (Mark Beckwith)
> 12. Re: McMaster-Carr Fiberglass Rod (Terry Dunlap)
> 13. Re: McMaster-Carr Fiberglass Rod (Sylvan Katz)
> 14. Re: Inverted L update (olinger@bellsouth.net)
> 15. RE: Inverted L update (Wes Attaway)
>
>--__--__--
>
>Message: 1
>Reply-To: "FireBrick" <w9ol@billnjudy.com>
>From: "FireBrick" <w9ol@billnjudy.com>
>To: "TowerTalk List" <towertalk@contesting.com>
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 10:28:39 -0500
>Subject: [Towertalk] Inverted L update
>
>Subsequent to my previous post. I just for grins hooked a piece of coax to
>the inverted L with the braid going to the ground that all (don't laugh, 4
>radials) is attached to.
>I'm seeing
>1801 1.2 to 1
>1902 1.2 to 1
>1950 1.35 to 1
>1997 1.5 to 1
>
>This is too good to be true.
>So why the good readings?
>
>BTW: no match at all on 80
>And I forgot to say that I had a Sommer 15 foot boom multiband on top of the
>tower.
>
>
>-----------------------------------------------------
>Anything worth fighting for is worth fighting dirty for.
>-----------------------------------------------------
>
>Bill H. in Chicagoland
>w9ol@billnjudy.com
>www.billnjudy.com
>http://files.billnjudy.com
>
>
>
>
>--__--__--
>
>Message: 2
>From: "Martin Sole" <msbkk39@hotmail.com>
>To: <towertalk@contesting.com>
To: <towertalk@contesting.com>
>Date: Sun, 18 Aug 2002 17:26:27 +0700
>Subject: [Towertalk] Tower design
>
>Folks,
>
>I am just about to start the preparation work for a new tower
>installation. We moved into a house a couple of months ago and once the
>remaining work is dealt with I hope to get started on the tower and
>antenna. I have never done this before and want to make sure that all of
>the important issues are covered. The land plot is something like 4000
>square feet with the house occupying approximately 40% of that. Most of
>the land is at the front of the property, as is common here, and the
>backyard area is 40 feet wide and 10 feet from the rear of the house to
>the back wall. Behind the house are acres and acres of vacant land that
>will never be built on. My preference is for a self supporting tower at
>the rear of the property, these are available locally and constructed to
>suit individual requirements. Antenna overhang onto the vacant land is
>not going to be a problem. My main interest is in 20-15-10 but I would
>like the option of adding a shortened 40m antenna at some point in the
>future. I currently have the antenna, a cushcraft X9 and the rotator, a
>rebuilt T2X, capacitor will probably go at the top of the tower.
>
>My first question has to do with height. What would be the best sensible
>height between say 60 and 100 feet?
>
>How can I verify the foundation design? Assuming this is done by the
>tower supplier and knowing that the local soil is notoriously soft
>piling will most likely be necessary but I do not want something that is
>over engineered so as to be ridiculously expensive.
>
>Currently I am considering a three legged design in steel tapering from
>something like a six foot leg spacing at the base to a 12 to 18 inch
>face at 60 to 70 % of the total height and parallel from there to the
>top.
>
>I would appreciate any comments and ideas.
>
>73's
>Martin HS0/G4UQF
>Bangkok, Thailand
>
>--__--__--
>
>Message: 3
>From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
>To: towertalk@contesting.com
To: <towertalk@contesting.com>
>Date: Mon, 19 Aug 2002 17:40:03 +0000
>Subject: [Towertalk] Sidemount concerns
>
>
>It was in CQ; not QST. July issue as I recall.
>
>Rob Atkinson
>K5UJ
>
>On Thu, 15 Aug 2002 16:34:26 +0000 kb9cry@attbi.com writes:
>>Well, guys there is some validity of the concern about a side mounted
>>antenna or other, causing undo stresses on a tower. Wasn't there an
>>article in last month's QST that talked about how most installations are
>>not good and if the stresses are calculated, most towers could collapse?
>>Little 2M beams may be one thing but larger HF antennas may be a future
>>problem, regardless of the number of legs attached. Look around for that
>>article and consult with its author and/or your own local structural
>>engineer. Phil KB9CRY
>
>
>
>_________________________________________________________________
>Send and receive Hotmail on your mobile device: http://mobile.msn.com
>
>
>--__--__--
>
>Message: 4
>To: towertalk@contesting.com
>From: "Willie Peloquin" <n8wp@arrl.net>
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 09:34:52 -0700 (PDT)
>Subject: [Towertalk] AB-577/GRC Surplus Mast
>
>Does anyone know of any surplus dealers on the west
>coast that have an AB-577/GRC Military Surplus Antenna
>Mast system? How about one for sale from a Tower Talk
>subscriber?
>
>Thanks,
>
>Willie N8WP
>
>--__--__--
>
>Message: 5
>From: Kevin Adam <n9iww2@verizon.net>
>Reply-To: n9iww2@verizon.net
>Organization: Webz By Design
>To: "Willie Peloquin" <n8wp@arrl.net>, towertalk@contesting.com
>Subject: Re: [Towertalk] AB-577/GRC Surplus Mast
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 06:59:47 -0500
>
>Surplus sales of canada does don't know the web address they always have
them
>at dayton
>N9IWW
>
>On Tuesday 20 August 2002 11:34 am, Willie Peloquin wrote:
>> Does anyone know of any surplus dealers on the west
>> coast that have an AB-577/GRC Military Surplus Antenna
>> Mast system? How about one for sale from a Tower Talk
>> subscriber?
>>
>> Thanks,
>>
>> Willie N8WP
>> _______________________________________________
>> Self Supporting Towers, Wireless Weather Stations, see web site:
>> http://www.mscomputer.com Call 888-333-9041 to place your order, mention
>> you saw this ad and take an additional 5 percent off any weather station
>> price.
>> _______________________________________________
>> Towertalk mailing list
>> Towertalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>--
>Kevin Adam
>1239 W. Till Rd.
>Fort Wayne IN. 46825-2145
>
>1-866-490-7312
>Phone & Fax
>260-490-7312
>
>--__--__--
>
>Message: 6
>From: "Dale L Martin" <kg5u@hal-pc.org>
>To: <towertalk@contesting.com>
>Subject: RE: [Towertalk] AB-577/GRC Surplus Mast
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 12:13:59 -0500
>
>
>Gee, I did a search on yahoo.com using "ab-577/grc antenna" and got lots of
>hits.
>
>
>> -----Original Message-----
>> From: towertalk-admin@contesting.com
>> [mailto:towertalk-admin@contesting.com]On Behalf Of Kevin Adam
>> Sent: Tuesday, August 20, 2002 07:00
>> To: Willie Peloquin; towertalk@contesting.com
>> Subject: Re: [Towertalk] AB-577/GRC Surplus Mast
>>
>>
>> Surplus sales of canada does don't know the web address they
>> always have them
>> at dayton
>> N9IWW
>>
>> On Tuesday 20 August 2002 11:34 am, Willie Peloquin wrote:
>> > Does anyone know of any surplus dealers on the west
>> > coast that have an AB-577/GRC Military Surplus Antenna
>> > Mast system? How about one for sale from a Tower Talk
>> > subscriber?
>> >
>> > Thanks,
>> >
>> > Willie N8WP
>> > _______________________________________________
>> > Self Supporting Towers, Wireless Weather Stations, see web site:
>> > http://www.mscomputer.com Call 888-333-9041 to place your order, mention
>> > you saw this ad and take an additional 5 percent off any weather station
>> > price.
>> > _______________________________________________
>> > Towertalk mailing list
>> > Towertalk@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/towertalk
>>
>> --
>> Kevin Adam
>> 1239 W. Till Rd.
>> Fort Wayne IN. 46825-2145
>>
>> 1-866-490-7312
>> Phone & Fax
>> 260-490-7312
>> _______________________________________________
>> Self Supporting Towers, Wireless Weather Stations, see web site:
>http://www.mscomputer.com
>Call 888-333-9041 to place your order, mention you saw this ad and take an
>additional 5 percent off
>any weather station price.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>--__--__--
>
>Message: 7
>Reply-To: <Jim@ShawResources.com>
>From: "Jim Shaw" <Jim@ShawResources.com>
>To: <n9iww2@verizon.net>, "Willie Peloquin" <n8wp@arrl.net>,
> <towertalk@contesting.com>
>Subject: RE: [Towertalk] AB-577/GRC Surplus Mast
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 10:28:54 -0700
>
>try this URL
>
>http://home.att.net/~surplusben/prod01.htm
>
>73 de Jim WA6PXU@ARRL.net
>
>-----Original Message-----
>From: towertalk-admin@contesting.com
>[mailto:towertalk-admin@contesting.com]On Behalf Of Kevin Adam
>Sent: Tuesday, August 20, 2002 5:00 AM
>To: Willie Peloquin; towertalk@contesting.com
>Subject: Re: [Towertalk] AB-577/GRC Surplus Mast
>
>
>Surplus sales of canada does don't know the web address they always have
>them
>at dayton
>N9IWW
>
>On Tuesday 20 August 2002 11:34 am, Willie Peloquin wrote:
>> Does anyone know of any surplus dealers on the west
>> coast that have an AB-577/GRC Military Surplus Antenna
>> Mast system? How about one for sale from a Tower Talk
>> subscriber?
>>
>> Thanks,
>>
>> Willie N8WP
>> _______________________________________________
>> Self Supporting Towers, Wireless Weather Stations, see web site:
>> http://www.mscomputer.com Call 888-333-9041 to place your order, mention
>> you saw this ad and take an additional 5 percent off any weather station
>> price.
>> _______________________________________________
>> Towertalk mailing list
>> Towertalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
>--
>Kevin Adam
>1239 W. Till Rd.
>Fort Wayne IN. 46825-2145
>
>1-866-490-7312
>Phone & Fax
>260-490-7312
>_______________________________________________
>Self Supporting Towers, Wireless Weather Stations, see web site:
>http://www.mscomputer.com
>Call 888-333-9041 to place your order, mention you saw this ad and take an
>additional 5 percent off
>any weather station price.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>--__--__--
>
>Message: 8
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 13:36:36 -0400
>From: David <k4zzr@bellsouth.net>
>To: <towertalk@contesting.com>
>Subject: [Towertalk] Re: At least TIME magazine responded
>
>....thanks for enlightning us.
>
>;-)
>
>David, K4ZZR
>
>
>>Subject: Re: Lightning vs. Lightening ----- Is anyone home?
>
>
>>Thank you for writing to point out the most embarrassing misspelling, in
>>People, August 12--the inexplicable "lightening" for "lightning." Our
>>apologies.
>>
>>Again our thanks for writing, and best wishes.
>>
>>
>>Gloria Hammond
>>TIME Letters
>
>The lightning project is now officially closed! JB
>
>
>
>
>--__--__--
>
>Message: 9
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 16:24:17 -0500
>From: Tom Anderson <ww5l@gte.net>
>Reply-To: ww5l@gte.net
>Organization: Anderson Communications
>To: W0UN--John Brosnahan <shr@ricc.net>, towertalk@contesting.com
>Subject: [Towertalk] Antenna Restrictions
>
>Fellow Tower Talkers:
>
>Miracles never cease with homeowners associations.
>
>A ham friend of mine who lives in South Texas in a deed restricted
development has actually gotten
>APPROVAL from his homeowners association board of directors and their
attorney after a hearing to put
>up a TriEX WT 51 crank up tower with no restrictions, etc. He faxed me a
copy of the letter the HOA's
>attorney sent him and all it says is to comply with normal engineering
standards for the WT51.
>
>He was very upfront in his letter of application of what he wanted to do
and the antenna he will put
>up, a Telrex TB6EM. No threats of PB-1 or anything like that, just very
straightforward. He did
>mention he was a member of RACES, Skywarn, etc. and the area where he
lives in South Texas had recently
>undergone severe flooding and hams received newspaper and TV coverage of
what they did to help out.
>
>It also helped that he was good friends with the HOA Board president.
>
>Tom, WW5L
>
>
>
>
>>
>
>
>
>--__--__--
>
>Message: 10
>From: "Mark Beckwith" <mark@concertart.com>
>To: <towertalk@contesting.com>
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 16:29:07 -0500
>Subject: [Towertalk] McMaster-Carr Fiberglass Rod
>
>Hello friends, a quick question. When Fiberglass Rod came up a couple
>months ago, somebody referred us to McMaster Carr. I need some for an
>antenna project. Their listing says that their 1-1/4" fiberglass rod has a
>diameter tolerance of "+/- .125" - or "plus or minus an EIGHTH OF AN INCH."
>
>Surely this is not really the case? Has anybody ever bought this stuff and
>can say "I bought it and it was right on" or whatever?
>
>Can anyone suggest a source where I can be confident I'll get the size I
>order?
>
>Thanks.
>
>Mark, N5OT
>
>
>
>--__--__--
>
>Message: 11
>From: "Mark Beckwith" <mark@concertart.com>
>To: <towertalk@contesting.com>
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 16:35:03 -0500
>Subject: [Towertalk] ICE Rotator cable lightning protector
>
>I am looking at a photo of an ICE rotator line suppressor. Do these things
>have 8 ins and 8 outs? It looks like 4 ins and 4 outs to me (8 screw
>terminals total). What am I missing?
>
>Mark, N5OT
>
>
>
>--__--__--
>
>Message: 12
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 14:58:03 -0700
>From: Terry Dunlap <kk6t@joneslumber.com>
>Subject: Re: [Towertalk] McMaster-Carr Fiberglass Rod
>To: Mark Beckwith <mark@concertart.com>, towertalk@contesting.com
>
>Hmmm....what I see on their website is +/- 0.10"
>
>73 de Terry KK6T
>
>
>
>At 04:29 PM 8/20/2002 -0500, Mark Beckwith wrote:
>>Hello friends, a quick question. When Fiberglass Rod came up a couple
>>months ago, somebody referred us to McMaster Carr. I need some for an
>>antenna project. Their listing says that their 1-1/4" fiberglass rod has a
>>diameter tolerance of "+/- .125" - or "plus or minus an EIGHTH OF AN INCH."
>>
>>Surely this is not really the case? Has anybody ever bought this stuff and
>>can say "I bought it and it was right on" or whatever?
>>
>>Can anyone suggest a source where I can be confident I'll get the size I
>>order?
>>
>>Thanks.
>>
>>Mark, N5OT
>>
>>
>>_______________________________________________
>>Self Supporting Towers, Wireless Weather Stations, see web site:
>>http://www.mscomputer.com
>>Call 888-333-9041 to place your order, mention you saw this ad and take an
>>additional 5 percent off
>>any weather station price.
>>_______________________________________________
>>Towertalk mailing list
>>Towertalk@contesting.com
>>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>--__--__--
>
>Message: 13
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 16:13:42 -0600
>From: Sylvan Katz <jskatz@sk.sympatico.ca>
>Subject: Re: [Towertalk] McMaster-Carr Fiberglass Rod
>To: Terry Dunlap <kk6t@joneslumber.com>, Mark Beckwith <mark@concertart.com>,
> towertalk@contesting.com
>Reply-to: Sylvan Katz <jskatz@sk.sympatico.ca>
>
>> Hmmm....what I see on their website is +/- 0.10"
>
>It depends on which page you look. In the catalog it is +/- 0.10" but on the
>page for 5' or 10' piece of 1-1/4" (Part Number 8543K17 or 8543K11) it
>specifies +/- 0.125"
>
>Time for a telephone call ? :)
>
>.. sylvan
>
>Ô¿Ô¬
>----------------
>Sylvan Katz, VE5ZX
>Saskatoon, SK
>"A Novel Perspective of Amateur Radio Contesting" at
>http://www.dynamicforesight.com/~ve5zx
>
>
>
>--__--__--
>
>Message: 14
>From: <olinger@bellsouth.net>
>To: "FireBrick" <w9ol@billnjudy.com>,
> "TowerTalk List" <towertalk@contesting.com>
>Subject: Re: [Towertalk] Inverted L update
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 18:13:42 -0400
>
>Very straightforward.
>
>160: Grounding is very poor for the needs and the ground connection is
providing a very lossy unvarying addition to the probable natural 25 ohm
impedance of the L. Low band shortened/bent vertical against ground
antennas with low, broad SWR's are heating up the grass with a large
percentage of the applied power. Using the back yard as a partial dummy
load. Dummy loads have flat wide SWR's.
>
>HOWEVER, you will be able to work people on 160. (By the way, just about
zilch SS activity on 160. But plenty on 75/80)
>
>80: This is a high impedance feed, possibly as high as 1000 ohms or more.
You will need a tuned network to get power into it. BUT, once you do, you
will find that the ground system you describe is "good enough" and you will
do nicely on 75/80m, particularly for SS, and do more than you would expect
with DX. I have used antenna's of this sort on 75/80 since the 50's with
excellent results
>
>There are several ways to feed this. SOME ready built tuners will match this.
>
>Rolling your own, get a coil and a cap, put them in parallel. One end to
the wire, the other to ground. Run the coax shield from SWR bridge to the
ground, run the center conductor to an alligator clip. Start with the clip
on the coil about 1/5 up from ground end on the coil. Tune cap for min SWR.
Move clip up or down for min SWR. Repeat this sequence until best match. If
the match is not all that good and overly broad, esp if the cap is fully
meshed, add more coil to the assembly. If the match is very narrow and
overly sharp, remove some coil.
>
>Since the coax is only 6 feet to the antenna, you can get away with the
network being on the transmitter end of the antenna coax.
>
>This is a voltage point. You will need a capacitor with some spacing
between the plates, depending on your power level.
>
>There are other equally good ways of dealing with this that will allow you
to use a typical tuner.
>
>This antenna will also work well on 40 and 30 meters.
>
>>
>> From: "FireBrick" <w9ol@billnjudy.com>
To: <towertalk@contesting.com>
>> Date: 2002/08/20 Tue AM 11:28:39 EDT
>> To: "TowerTalk List" <towertalk@contesting.com>
>> Subject: [Towertalk] Inverted L update
>>
>> Subsequent to my previous post. I just for grins hooked a piece of coax to
>> the inverted L with the braid going to the ground that all (don't laugh, 4
>> radials) is attached to.
>> I'm seeing
>> 1801 1.2 to 1
>> 1902 1.2 to 1
>> 1950 1.35 to 1
>> 1997 1.5 to 1
>>
>> This is too good to be true.
>> So why the good readings?
>>
>> BTW: no match at all on 80
>> And I forgot to say that I had a Sommer 15 foot boom multiband on top of
the
>> tower.
>>
>>
>> -----------------------------------------------------
>> Anything worth fighting for is worth fighting dirty for.
>> -----------------------------------------------------
>>
>> Bill H. in Chicagoland
>> w9ol@billnjudy.com
>> www.billnjudy.com
>> http://files.billnjudy.com
>>
>>
>>
>> _______________________________________________
>> Self Supporting Towers, Wireless Weather Stations, see web site:
http://www.mscomputer.com
>> Call 888-333-9041 to place your order, mention you saw this ad and take
an additional 5 percent off
>> any weather station price.
>> _______________________________________________
>> Towertalk mailing list
>> Towertalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>
>
>
>--__--__--
>
>Message: 15
>From: "Wes Attaway" <wes@attawayinterests.com>
>To: "FireBrick" <w9ol@billnjudy.com>,
> "TowerTalk List" <towertalk@contesting.com>
>Subject: RE: [Towertalk] Inverted L update
To: <towertalk@contesting.com>
>Date: Tue, 20 Aug 2002 17:31:59 -0500
>
>Those readings are just about what you would expect from an L of your
>dimensions with a less than perfect ground system. Your feedpoint impedance
>is probably a little higher than 50-ohms right now. With a really good
>ground system the feedpoint impedance should fall a bit, down closer to
>35-ohms or so. There is actually no need to do any matching for an Inverted
>L fed with 50-ohm coax unless it is way too long or short as long as you can
>tolerate an SWR of less than 2-to-1. One way to "tune" an L is to put in
>the best ground system you can in your location, use a vertical run of 60 to
>70 ft, and then adjust the horizontal length for the best match.
>
>-----Original Message-----
>From: towertalk-admin@contesting.com
>[mailto:towertalk-admin@contesting.com]On Behalf Of FireBrick
>Sent: Tuesday, August 20, 2002 10:29 AM
>To: TowerTalk List
>Subject: [Towertalk] Inverted L update
>
>
>Subsequent to my previous post. I just for grins hooked a piece of coax to
>the inverted L with the braid going to the ground that all (don't laugh, 4
>radials) is attached to.
>I'm seeing
>1801 1.2 to 1
>1902 1.2 to 1
>1950 1.35 to 1
>1997 1.5 to 1
>
>This is too good to be true.
>So why the good readings?
>
>BTW: no match at all on 80
>And I forgot to say that I had a Sommer 15 foot boom multiband on top of the
>tower.
>
>
>-----------------------------------------------------
>Anything worth fighting for is worth fighting dirty for.
>-----------------------------------------------------
>
>Bill H. in Chicagoland
>w9ol@billnjudy.com
>www.billnjudy.com
>http://files.billnjudy.com
>
>
>
>_______________________________________________
>Self Supporting Towers, Wireless Weather Stations, see web site:
>http://www.mscomputer.com
>Call 888-333-9041 to place your order, mention you saw this ad and take an
>additional 5 percent off
>any weather station price.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
>
>--__--__--
>
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>End of Towertalk Digest
>
|