<html><head></head><body><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;"></div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;">
</div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;" dir="ltr" data-setdir="false">I have found (as a fact) that if you arc the balun, this will happen .I just had to separate the wires a little and clear the arc over point. inside the balun. All is well afterward.</div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;" dir="ltr" data-setdir="false"><br></div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;" dir="ltr" data-setdir="false">Marcel<br></div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;"><br></div><div class="ydpd152232cyahoo-style-wrap" style="font-family: Helvetica Neue,Helvetica,Arial,sans-serif; font-size: 13px;">
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On Monday, September 16, 2019 12:00:09 PM CDT, lcc-request@louisianacontestclub.org <lcc-request@louisianacontestclub.org> wrote:
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<div><div dir="ltr">Send LCC mailing list submissions to<br></div><div dir="ltr"> <a href="mailto:lcc@louisianacontestclub.org" target="_blank" rel="nofollow">lcc@louisianacontestclub.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">To subscribe or unsubscribe via the World Wide Web, visit<br></div><div dir="ltr"> <a href="http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestclub.org" target="_blank" rel="nofollow">http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestclub.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">or, via email, send a message with subject or body 'help' to<br></div><div dir="ltr"> <a href="mailto:lcc-request@louisianacontestclub.org" target="_blank" rel="nofollow">lcc-request@louisianacontestclub.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">You can reach the person managing the list at<br></div><div dir="ltr"> <a href="mailto:lcc-owner@louisianacontestclub.org" target="_blank" rel="nofollow">lcc-owner@louisianacontestclub.org</a><br></div><div dir="ltr"><br></div><div dir="ltr">When replying, please edit your Subject line so it is more specific<br></div><div dir="ltr">than "Re: Contents of LCC digest..."<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Today's Topics:<br></div><div dir="ltr"><br></div><div dir="ltr"> 1. Force 12 EF-240 SWR shift (<a href="mailto:w5wz@w5wz.com" target="_blank" rel="nofollow">w5wz@w5wz.com</a>)<br></div><div dir="ltr"> 2. Re: Force 12 EF-240 SWR shift (Don Hill AA5AU)<br></div><div dir="ltr"> 3. Re: Force 12 EF-240 SWR shift (Charles Morrison)<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">----------------------------------------------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 1<br></div><div dir="ltr">Date: Sun, 15 Sep 2019 15:33:38 -0500<br></div><div dir="ltr">From: <a href="mailto:w5wz@w5wz.com" target="_blank" rel="nofollow">w5wz@w5wz.com</a><br></div><div dir="ltr">To: LCC <<a href="mailto:lcc@louisianacontestclub.org" target="_blank" rel="nofollow">lcc@louisianacontestclub.org</a>><br></div><div dir="ltr">Subject: [LCC] Force 12 EF-240 SWR shift<br></div><div dir="ltr">Message-ID: <<a href="mailto:8d1f0847091ed1c11ab521ffad0ee17f@w5wz.com" target="_blank" rel="nofollow">8d1f0847091ed1c11ab521ffad0ee17f@w5wz.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=US-ASCII; format=flowed<br></div><div dir="ltr"><br></div><div dir="ltr">The SWR minimum on my lowest Force 12 EF-240 has shifted from ~7.16 MHz <br></div><div dir="ltr">down to about 6.7 MHz. However, the curve appears very similar to <br></div><div dir="ltr">measurements taken and archived in 2015; it's just that it shifted down <br></div><div dir="ltr">in frequency. Examining the antenna with binoculars from the ground, I <br></div><div dir="ltr">do not see any mechanical damage or oddities.<br></div><div dir="ltr"><br></div><div dir="ltr">This is a linear loaded type antenna. It uses a bead-balun, and has a <br></div><div dir="ltr">coil hairpin across the feed point of the driven element.<br></div><div dir="ltr"><br></div><div dir="ltr">These measurements were taken in the shack, with the AA-55 in place of <br></div><div dir="ltr">the transceiver; thus the entire transmit RF path is being tested. I've <br></div><div dir="ltr">also tested at the base of the tower, such that only 125 feet of LMR400, <br></div><div dir="ltr">a PL-259-barrel-PL259 connect, and the PL-259-SO-239 connection at the <br></div><div dir="ltr">balun are involved. The results are very similar, so I do not suspect <br></div><div dir="ltr">anything amiss that is not up the tower.<br></div><div dir="ltr"><br></div><div dir="ltr">I took a sweep of the antenna today and another identical antenna, <br></div><div dir="ltr">ranging from 6.0 to 8.0 MHz. That data can be found at:<br></div><div dir="ltr"><a href="http://w5wz.com/files/40mSCAN" target="_blank" rel="nofollow">http://w5wz.com/files/40mSCAN</a><br></div><div dir="ltr"><br></div><div dir="ltr">The purple line is the top antenna in the stack, and the blue line is <br></div><div dir="ltr">the bottom antenna in the stack. Both are Force 12 EF-240.<br></div><div dir="ltr"><br></div><div dir="ltr">Lower in frequency = longer elements. What could have changed to make <br></div><div dir="ltr">the antenna appear electrically longer?<br></div><div dir="ltr"><br></div><div dir="ltr">Any thoughts?<br></div><div dir="ltr"><br></div><div dir="ltr">--Scott, W5WZ<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 2<br></div><div dir="ltr">Date: Sun, 15 Sep 2019 17:52:42 -0500<br></div><div dir="ltr">From: "Don Hill AA5AU" <<a href="mailto:aa5au@bellsouth.net" target="_blank" rel="nofollow">aa5au@bellsouth.net</a>><br></div><div dir="ltr">To: "'LCC'" <<a href="mailto:lcc@louisianacontestclub.org" target="_blank" rel="nofollow">lcc@louisianacontestclub.org</a>><br></div><div dir="ltr">Subject: Re: [LCC] Force 12 EF-240 SWR shift<br></div><div dir="ltr">Message-ID: <000001d56c18$49223090$db6691b0$@net><br></div><div dir="ltr">Content-Type: text/plain; charset="us-ascii"<br></div><div dir="ltr"><br></div><div dir="ltr">Time to climb the tower and check it at the feed and do a visual on the<br></div><div dir="ltr">balun and coil hairpin.<br></div><div dir="ltr"><br></div><div dir="ltr">Don AA5AU<br></div><div dir="ltr"><br></div><div dir="ltr">-----Original Message-----<br></div><div dir="ltr">From: LCC [mailto:<a href="mailto:lcc-bounces@louisianacontestclub.org" target="_blank" rel="nofollow">lcc-bounces@louisianacontestclub.org</a>] On Behalf Of<br></div><div dir="ltr"><a href="mailto:w5wz@w5wz.com" target="_blank" rel="nofollow">w5wz@w5wz.com</a><br></div><div dir="ltr">Sent: Sunday, September 15, 2019 3:34 PM<br></div><div dir="ltr">To: LCC<br></div><div dir="ltr">Subject: [LCC] Force 12 EF-240 SWR shift<br></div><div dir="ltr"><br></div><div dir="ltr">The SWR minimum on my lowest Force 12 EF-240 has shifted from ~7.16 MHz <br></div><div dir="ltr">down to about 6.7 MHz. However, the curve appears very similar to <br></div><div dir="ltr">measurements taken and archived in 2015; it's just that it shifted down <br></div><div dir="ltr">in frequency. Examining the antenna with binoculars from the ground, I <br></div><div dir="ltr">do not see any mechanical damage or oddities.<br></div><div dir="ltr"><br></div><div dir="ltr">This is a linear loaded type antenna. It uses a bead-balun, and has a <br></div><div dir="ltr">coil hairpin across the feed point of the driven element.<br></div><div dir="ltr"><br></div><div dir="ltr">These measurements were taken in the shack, with the AA-55 in place of <br></div><div dir="ltr">the transceiver; thus the entire transmit RF path is being tested. I've <br></div><div dir="ltr">also tested at the base of the tower, such that only 125 feet of LMR400, <br></div><div dir="ltr">a PL-259-barrel-PL259 connect, and the PL-259-SO-239 connection at the <br></div><div dir="ltr">balun are involved. The results are very similar, so I do not suspect <br></div><div dir="ltr">anything amiss that is not up the tower.<br></div><div dir="ltr"><br></div><div dir="ltr">I took a sweep of the antenna today and another identical antenna, <br></div><div dir="ltr">ranging from 6.0 to 8.0 MHz. That data can be found at:<br></div><div dir="ltr"><a href="http://w5wz.com/files/40mSCAN" target="_blank" rel="nofollow">http://w5wz.com/files/40mSCAN</a><br></div><div dir="ltr"><br></div><div dir="ltr">The purple line is the top antenna in the stack, and the blue line is <br></div><div dir="ltr">the bottom antenna in the stack. Both are Force 12 EF-240.<br></div><div dir="ltr"><br></div><div dir="ltr">Lower in frequency = longer elements. What could have changed to make <br></div><div dir="ltr">the antenna appear electrically longer?<br></div><div dir="ltr"><br></div><div dir="ltr">Any thoughts?<br></div><div dir="ltr"><br></div><div dir="ltr">--Scott, W5WZ<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">LCC mailing list<br></div><div dir="ltr"><a href="mailto:LCC@louisianacontestclub.org" target="_blank" rel="nofollow">LCC@louisianacontestclub.org</a><br></div><div dir="ltr"><a href="http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestcl" target="_blank" rel="nofollow">http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestcl</a><br></div><div dir="ltr">ub.org<br></div><div dir="ltr">Message delivered to <a href="mailto:aa5au@bellsouth.net" target="_blank" rel="nofollow">aa5au@bellsouth.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 3<br></div><div dir="ltr">Date: Sun, 15 Sep 2019 22:31:07 -0500<br></div><div dir="ltr">From: "Charles Morrison" <<a href="mailto:cmorrison@lusfiber.net" target="_blank" rel="nofollow">cmorrison@lusfiber.net</a>><br></div><div dir="ltr">To: <<a href="mailto:w5wz@w5wz.com" target="_blank" rel="nofollow">w5wz@w5wz.com</a>>, "'LCC'" <<a href="mailto:lcc@louisianacontestclub.org" target="_blank" rel="nofollow">lcc@louisianacontestclub.org</a>><br></div><div dir="ltr">Subject: Re: [LCC] Force 12 EF-240 SWR shift<br></div><div dir="ltr">Message-ID: <000201d56c3f$2d97cc00$88c76400$@lusfiber.net><br></div><div dir="ltr">Content-Type: text/plain; charset="us-ascii"<br></div><div dir="ltr"><br></div><div dir="ltr">I have the Force 12 C4XL which has your EF240 on the same boom as the<br></div><div dir="ltr">tribander, with a separate feedline. After many years of faithful service,<br></div><div dir="ltr">mine went south as well. The balun.<br></div><div dir="ltr"><br></div><div dir="ltr">The balun filler leached into the SO239 and shorted my input. Changed it<br></div><div dir="ltr">out with a Balun Designs 1115t. 3-5KW 1:1 balun in a box.. no problems<br></div><div dir="ltr">since. Worth the money, best baluns on the market.<br></div><div dir="ltr"><br></div><div dir="ltr"><a href="https://www.balundesigns.com/model-1115-1-1-balun-1-5-54-mhz-3-5kw/" target="_blank" rel="nofollow">https://www.balundesigns.com/model-1115-1-1-balun-1-5-54-mhz-3-5kw/</a><br></div><div dir="ltr"><br></div><div dir="ltr">Charlie<br></div><div dir="ltr">N5WE<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">-----Original Message-----<br></div><div dir="ltr">From: LCC [mailto:<a href="mailto:lcc-bounces@louisianacontestclub.org" target="_blank" rel="nofollow">lcc-bounces@louisianacontestclub.org</a>] On Behalf Of<br></div><div dir="ltr"><a href="mailto:w5wz@w5wz.com" target="_blank" rel="nofollow">w5wz@w5wz.com</a><br></div><div dir="ltr">Sent: Sunday, September 15, 2019 3:34 PM<br></div><div dir="ltr">To: LCC <<a href="mailto:lcc@louisianacontestclub.org" target="_blank" rel="nofollow">lcc@louisianacontestclub.org</a>><br></div><div dir="ltr">Subject: [LCC] Force 12 EF-240 SWR shift<br></div><div dir="ltr"><br></div><div dir="ltr">The SWR minimum on my lowest Force 12 EF-240 has shifted from ~7.16 MHz down<br></div><div dir="ltr">to about 6.7 MHz. However, the curve appears very similar to measurements<br></div><div dir="ltr">taken and archived in 2015; it's just that it shifted down in frequency.<br></div><div dir="ltr">Examining the antenna with binoculars from the ground, I do not see any<br></div><div dir="ltr">mechanical damage or oddities.<br></div><div dir="ltr"><br></div><div dir="ltr">This is a linear loaded type antenna. It uses a bead-balun, and has a coil<br></div><div dir="ltr">hairpin across the feed point of the driven element.<br></div><div dir="ltr"><br></div><div dir="ltr">These measurements were taken in the shack, with the AA-55 in place of the<br></div><div dir="ltr">transceiver; thus the entire transmit RF path is being tested. I've also<br></div><div dir="ltr">tested at the base of the tower, such that only 125 feet of LMR400, a<br></div><div dir="ltr">PL-259-barrel-PL259 connect, and the PL-259-SO-239 connection at the balun<br></div><div dir="ltr">are involved. The results are very similar, so I do not suspect anything<br></div><div dir="ltr">amiss that is not up the tower.<br></div><div dir="ltr"><br></div><div dir="ltr">I took a sweep of the antenna today and another identical antenna, ranging<br></div><div dir="ltr">from 6.0 to 8.0 MHz. That data can be found at:<br></div><div dir="ltr"><a href="http://w5wz.com/files/40mSCAN" target="_blank" rel="nofollow">http://w5wz.com/files/40mSCAN</a><br></div><div dir="ltr"><br></div><div dir="ltr">The purple line is the top antenna in the stack, and the blue line is the<br></div><div dir="ltr">bottom antenna in the stack. Both are Force 12 EF-240.<br></div><div dir="ltr"><br></div><div dir="ltr">Lower in frequency = longer elements. What could have changed to make the<br></div><div dir="ltr">antenna appear electrically longer?<br></div><div dir="ltr"><br></div><div dir="ltr">Any thoughts?<br></div><div dir="ltr"><br></div><div dir="ltr">--Scott, W5WZ<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">LCC mailing list<br></div><div dir="ltr"><a href="mailto:LCC@louisianacontestclub.org" target="_blank" rel="nofollow">LCC@louisianacontestclub.org</a><br></div><div dir="ltr"><a href="http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestcl" target="_blank" rel="nofollow">http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestcl</a><br></div><div dir="ltr">ub.org<br></div><div dir="ltr">Message delivered to <a href="mailto:cmorrison@lusfiber.net" target="_blank" rel="nofollow">cmorrison@lusfiber.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Subject: Digest Footer<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">LCC mailing list<br></div><div dir="ltr"><a href="mailto:LCC@louisianacontestclub.org" target="_blank" rel="nofollow">LCC@louisianacontestclub.org</a><br></div><div dir="ltr"><a href="http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestclub.org" target="_blank" rel="nofollow">http://mail.louisianacontestclub.org/mailman/listinfo/lcc_louisianacontestclub.org</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">End of LCC Digest, Vol 130, Issue 4<br></div><div dir="ltr">***********************************<br></div></div>
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