[VHFcontesting] Tech Help needed

[Paul Rollinson]

Well, misery loves company. Thanks for the feedback.I plan on calling M2 on Monday but was hoping to finish this project this weekend. 2m tower still needs attention. Hope to work you in January. Btw...is the Orlando hamfest canceled? Met you last year. Nice VHF dicussion.Thanks,Paul Rollinson, KE1LI Rollinson Associates860-928-5147860-208-8814 Cell/TextPaulrollinson at sbcglobal.net Representing Component Part Manufacturers for over 35 yearsSent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: Buddy Morgan via VHFcontesting <vhfcontesting at contesting.com> Date: 1/2/21  9:20 AM  (GMT-05:00) To: vhfcontesting at contesting.com Subject: Re: [VHFcontesting] Tech Help needed  Can't really offer you much help. But, about six months ago, I did what you are trying to do with my Five element M2. I did it without adjusting element lengths. (I agree, moving the shorting bars out, goes against the grain) Yes, the antenna is really made to operate in the low end of the band. Here is the best I could do:50.080         1:150.125         1:150.200         1.1:150.318         1.3:1Before re-tuning I think I was close to 2:1 @50.318. Doubt if this helps you. But, maybe it will spur on an M2 Five Element owner or two.Buddy WB4OMG  -----Original Message-----From: Paul Rollinson <Paulrollinson at sbcglobal.net>To: 'VHF Contesting Reflector' <vhfcontesting at contesting.com>Sent: Sat, Jan 2, 2021 9:01 amSubject: [VHFcontesting] Tech Help neededGood morning all, I hope you had a nice holiday. Part of prepping for the January contest included taking down the stack ofM26M7antennas and tuning them a bit higher to accommodate FT8/4 frequencieswhere the swr runs close to 2:1 After several hours of tweaking we were unsuccessful in elevating thefrequencies. Moving the shorting bars had little effect and the elements arecrimped together so shortening them would be permanent; I prefer not to dothis. After diving thru the specs, the antennas are 6M7 and not the modernversions 6M7JHV. Below is a link to the manual.https://dl-mail.ymail.com/ws/download/mailboxes/@.id==VjN-j4MNikUvGG6dI72pGtFnbtnm78WZEHQ84kCP5dKOEa_RWizZIRV1VtWw7y3GBuOyPtJBEyjJRlraKdU25EkUFw/messages/@.id==AOqprj4WDiqnX--apQiykLPEILk/content/parts/@.id==2/raw?appid=YMailNorrin<https://dl-mail.ymail.com/ws/download/mailboxes/@.id==VjN-j4MNikUvGG6dI72pGtFnbtnm78WZEHQ84kCP5dKOEa_RWizZIRV1VtWw7y3GBuOyPtJBEyjJRlraKdU25EkUFw/messages/@.id==AOqprj4WDiqnX--apQiykLPEILk/content/parts/@.id==2/raw?appid=YMailNorrin&ymreqid=117033b5-9242-646b-1c92-e7000301a500&token=zitEzqOML3j84e6ealFTT5U7-km5qEQF52lp7AcCuBZYNpCJiKFonMipX0nRikauD7BKLkpZAtQ_aN6eUBTbi2UcMC60Zo-ifhoLye8kBZhFaDq07_sCfvo7gxJ36C_A>&ymreqid=117033b5-9242-646b-1c92-e7000301a500&token=zitEzqOML3j84e6ealFTT5U7-km5qEQF52lp7AcCuBZYNpCJiKFonMipX0nRikauD7BKLkpZAtQ_aN6eUBTbi2UcMC60Zo-ifhoLye8kBZhFaDq07_sCfvo7gxJ36C_A  I'm looking for advice. The manual states that moving the shoring bars outwill increase the tuned frequency (which doesn't make sense to me). If thisis true, I may experiment with either adding push on rings to act ascapacitance hats, electrically lengthening the t match, or swedge on lengthsof rod to extend the t matches. The design freq of the antenna is very sharp: 49.5 to 50.5MHZ but I can'tseem to stay within 2:1 at 50.315. Running 1 kw is an issue for the amp. The other, not preferred option is to run a short segment of 70 ohm coax asa transformer but I will lose output/receive in the form of heat. We hung the antennas about 10 ft in the air to sweep so the numbers arefairly accurate. Any help or suggestions would be appreciated. Thanks, Paul Rollinson, KE1LIFN41AU860-928-5147860-208-8814 Cell/Text <mailto:Paulrollinson at sbcglobal.net> Paulrollinson at sbcglobal.net                    Happy Holidays -- This email has been checked for viruses by Avast antivirus software.https://www.avast.com/antivirus_______________________________________________VHFcontesting mailing listVHFcontesting at contesting.comhttp://lists.contesting.com/mailman/listinfo/vhfcontesting_______________________________________________VHFcontesting mailing listVHFcontesting at contesting.comhttp://lists.contesting.com/mailman/listinfo/vhfcontesting