[AMRadio] do not ground tower
I recommend not grounding the tower. Makes it harder to load up. Find a good ceramic insulating base like you're supposed to have, and the correct guy wire insulators spaced to minimize interaction with the radiating element, the tower. Here, you can see how we tried it the other way and I just couldn't get the loading to set. http://wa3vjb.amham.com/pics/Garden.jpg __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [AMRadio] do not ground tower
SHUNT FEED works fine with a grounded tower. That is what I used on 160m at one time and it worked very well. A grounded tower is safer. 4K I recommend not grounding the tower. Makes it harder to load up. Find a good ceramic insulating base like you're supposed to have, and the correct guy wire insulators spaced to minimize interaction with the radiating element, the tower. Here, you can see how we tried it the other way and I just couldn't get the loading to set. http://wa3vjb.amham.com/pics/Garden.jpg __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] do not ground tower
I have used both shunt feed and sloping wire feed through a series capacitor on a grounded tower for 160M and it works wonderful!! Just takes a little tinkering to get it right. 73, Jack, W9GT -- Original message -- From: VJB [EMAIL PROTECTED] I recommend not grounding the tower. Makes it harder to load up. Find a good ceramic insulating base like you're supposed to have, and the correct guy wire insulators spaced to minimize interaction with the radiating element, the tower. Here, you can see how we tried it the other way and I just couldn't get the loading to set. http://wa3vjb.amham.com/pics/Garden.jpg __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb From [EMAIL PROTECTED] Wed Jun 14 07:18:30 2006 Return-Path: [EMAIL PROTECTED] X-Original-To: amradio@mailman.qth.net Delivered-To: amradio@mailman.qth.net Received: from ms-smtp-01.texas.rr.com (ms-smtp-01.texas.rr.com [24.93.47.40]) by mailman.qth.net (Postfix) with ESMTP id B67B5859C1A for amradio@mailman.qth.net; Wed, 14 Jun 2006 07:18:30 -0400 (EDT) Received: from [127.0.0.1] (cpe-24-160-158-74.satx.res.rr.com [24.160.158.74]) by ms-smtp-01.texas.rr.com (8.13.6/8.13.6) with ESMTP id k5EBBroF015296 for amradio@mailman.qth.net; Wed, 14 Jun 2006 06:11:55 -0500 (CDT) Message-ID: [EMAIL PROTECTED] Date: Wed, 14 Jun 2006 06:11:50 -0500 From: W5OMR/Geoff [EMAIL PROTECTED] Organization: Every day of Freedom is a good day to thank a Veteran. User-Agent: Mozilla Thunderbird 1.0.7 (Windows/20050923) X-Accept-Language: en-us, en MIME-Version: 1.0 Cc: Discussion of AM Radio amradio@mailman.qth.net Subject: Re: [AMRadio] Re: upside down reply buttons, sending to whom, and tops VS bottoms and other non AM tech stuff References: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] In-Reply-To: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine X-BeenThere: amradio@mailman.qth.net X-Mailman-Version: 2.1.4 Precedence: list List-Id: Discussion of AM Radio amradio.mailman.qth.net List-Unsubscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] List-Archive: http://mailman.qth.net/mailman/private/amradio List-Post: mailto:amradio@mailman.qth.net List-Help: mailto:[EMAIL PROTECTED] List-Subscribe: http://mailman.qth.net/mailman/listinfo/amradio, mailto:[EMAIL PROTECTED] X-List-Received-Date: Wed, 14 Jun 2006 11:18:30 - Todd, KA1KAQ wrote: Interestinghitting 'reply' now sends only to the original sender, not to the list. Before it sent only to the list and 'reply all' sent to the list *and* the original poster. Right. That's the way I would prefer. I'd have to disagree with Geoff about the list suffering if set up like this, Let me get this straight.. you disagree with me, because you don't think the list will suffer, if not all particpants are able to partcipate in the message discussions, however... My reasons for replying to the list with a response are partly selfish too: having been less active over the past decade, I feel better knowing that if my assumption or advice is wrong, those who are more qualified will correct it. This helps not only the original recipient, but also re-educates me at the same time. Such a deal! You wish that the replies go to the list, because you want everyone to see/help with advice? Aren't we saying the same thing, here? -- Driving your AM Rig without a scope, is like driving your car at night, without headlights. (K4KYV) -- 73 = Best Regards, -Geoff/W5OMR
Re: [AMRadio] do not ground tower
I prefer the base insulator and series feed myself. Shunt feed or unipole feed works great if the tower is close to a resonant length. It becomes more difficult if the tower is much shorter than natural resonance. Sometimes top loading will make shunt feeding easier, since it raises the resonant frequency of a short tower. Series feed, if you can find an insulator, gives you a lot more options in tuning up the tower. Of course, if you are stuck with a typical ham radio style jury rig where the bottom section was embedded several feet into the concrete base, you have no choice. Unless the tower is short enough to stand without guys, that is about the worst possible way to erect a tower. A tall guyed tower is subject to much additional stress when the base is rigidly set in concrete; it cannot sway or rotate in heavy winds, and that can cause failure of the tower structure. If it is mounted with a base plate and pier pin, or a ball-and-socket insulator as AM broadcast towers are constructed, the base of the tower can follow the movements of the tower instead of having the entire tower bend and twist under high winds. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. Try it - you'll like it. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/
Re: [AMRadio] do not ground tower
For my 160m shunt fed tower I had a Rohn 25 - a 60 footer with a few feet buried in concrete... So I dug out some old articles on how to do it. Now, I DID have a good capacity hat in the form of a 4 element Swan TB4HA beam at the top. AND an 11 element Cushcraft bean on 2m FM above that. I had deliberately installed insulators on the guy wires, so that was not a problem. Ran a piece of #12 gauge solid copper wire up the side about 12 off the tower to a copper pipe standing off at about the 40 or 50 foot level and attached firmly to the tower with two U bolts. This is all from memory. There was a sreries variable capacitor at the bottom of the shunt line, and it worked really well. Flat SWR anywhere I wanted on Top Band! 73 de AF4K, Bry Don K4KYV writes: I prefer the base insulator and series feed myself. Shunt feed or unipole feed works great if the tower is close to a resonant length. It becomes more difficult if the tower is much shorter than natural resonance. Sometimes top loading will make shunt feeding easier, since it raises the resonant frequency of a short tower. Series feed, if you can find an insulator, gives you a lot more options in tuning up the tower. Of course, if you are stuck with a typical ham radio style jury rig where the bottom section was embedded several feet into the concrete base, you have no choice. Unless the tower is short enough to stand without guys, that is about the worst possible way to erect a tower. A tall guyed tower is subject to much additional stress when the base is rigidly set in concrete; it cannot sway or rotate in heavy winds, and that can cause failure of the tower structure. If it is mounted with a base plate and pier pin, or a ball-and-socket insulator as AM broadcast towers are constructed, the base of the tower can follow the movements of the tower instead of having the entire tower bend and twist under high winds. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. Try it - you'll like it. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
