Re: Topband: 4W6A
great Merv!... anyone know the SS/SR of them? 73, Jorge CX6VM -Mensaje original- De: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] En nombre de Merv Schweigert Enviado el: Domingo, 18 de Septiembre de 2011 01:11 p.m. Para: topband@contesting.com Asunto: Topband: 4W6A I was doing my morning routine calling CQ on 1822.5 at 1550Z just before sunrise, heard several times someone tune up, send some VVV etc. on my freq so I continued to call CQ. heard the tuner again, and this time he started calling CQ just a little down freq. Was 4W6A. He said QSX up so went up 1 and called, had to call several times before he finally came back. There was some QSB but he was about 579 here, not as strong as expected as on the other bands he is very strong. I heard a couple JA, UA0, KH6 calling him up 1 and he was having a hard time working any one, he stayed maybe 10 mins and left. I hope that there was just some local QRN or something. Anyway they are active at least on top band. GL 73 Merv K9FD/KH6 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: Effect of current max not at base of vertical.
This is a lot mushier for buried radials, but the simple case for elevated radials is that the standing waves are set by the distance of the end of the radials from the radial feed, just like it is on a dipole. The end of an elevated radial MUST be the zero current, high voltage controlling point of the radial. I have not found the ground image mental simplifying device to be at all useful. You will find that only a couple certain ideal cases match the behavior suggested by the image. Personally, I've ditched the ground image as a useful concept for any situation I can afford on HF and down. If you can copper-plate a meadow somewhere, it will work for you. If you can swing that, I have some investment opportunities for you :) The real trick with a lot of this is to force these mental simplification devices to deal accurately with losses that MUST be there. Losses in the dirt are there. ACCOUNT for them accurately and what is left after the shakedown starts to make sense. 73, Guy. 2011/9/17 Mike Waters mikew...@gmail.com Guy, I'm not saying that I understand this 100%, but I certainly do find it fascinating. I have a question, though. For quite some time, my understanding has been that by making a bottom-fed vertical (or inverted-L) longer than 1/4λ --and thereby raising the max current point-- that we simply move the point of maximum current farther out on the radials. This makes sense to me, if we consider the thought that the ground is an image of the antenna, the missing portion (for lack of a better expression). Other well-respected hams used to say that this condition significantly added to the requirements for the radial system under such a longer vertical in such a way that we now need even longer radials. Later, though, one of these hams seems to have reversed his beliefs 180°. I don't pretend to know the answer. (And at this point, I'm not sure anyone does. :-) If I use a 5/16λ or 3/8λ inverted-L, how does this change the requirements of: 1. ~60 radials stapled to the surface of the earth ? 2. An elevated counterpoise (which would of course require far fewer radials) ? Thanks, Mike www.w0btu.com On Fri, Sep 16, 2011 at 11:03 AM, Guy Olinger K2AV olin...@bellsouth.netwrote: This is an answer to an off reflector conversation, relating to a too long electrical length over radials reducing performance. I am writing to the [snip] ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: 4W6A
Merv et al.. I am 4W6A assistant QSL manager, I also work as their web updater, and liaise with the Team Pilot, Col, MM0NDX. Can I first thank Merv for his post, it has been passed to the 4W6A team, and can I explain the reason they were having trouble hearing stations... They had a faulty 240v-12v inverter that was giving out hash, therefore hampering operations. Already tonight (20:40 BST) several EU stations have made contact.with 4W6A, so it seems the RX situation has improved dramatically. Please, if any of you have reports, or have worked them, would you be kind enough to mail Col, MM0NDX, dxe...@gmail.com or myself, address in the head of this message. Thanks for any help Kev M0TNX 4W6A Assistant QSL Manager ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
Re: Topband: 4W6A
Hi Merv 4W6A started on 160m just after his Sunset. He's signal was in and out until I got a good peak near 10:15 Z and a solid QSO, Doug NX4D also worked him few minutes after me., as well Dave W5UN a little later. There was a nice sunrise peak around 11:00 Z down here in S Fla. 4W6A has a strong signal and can hear extremely well on 160m. Regards Carlos N4IS -Original Message- From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com] On Behalf Of Merv Schweigert Sent: Sunday, September 18, 2011 12:11 PM To: topband@contesting.com Subject: Topband: 4W6A I was doing my morning routine calling CQ on 1822.5 at 1550Z just before sunrise, heard several times someone tune up, send some VVV etc. on my freq so I continued to call CQ. heard the tuner again, and this time he started calling CQ just a little down freq. Was 4W6A. He said QSX up so went up 1 and called, had to call several times before he finally came back. There was some QSB but he was about 579 here, not as strong as expected as on the other bands he is very strong. I heard a couple JA, UA0, KH6 calling him up 1 and he was having a hard time working any one, he stayed maybe 10 mins and left. I hope that there was just some local QRN or something. Anyway they are active at least on top band. GL 73 Merv K9FD/KH6 ___ UR RST IS ... ... ..9 QSB QSB - hw? BK ___ UR RST IS ... ... ..9 QSB QSB - hw? BK
