- 1. Topband: Vertical question (score: 1)
- Author: Peter Schrader <vk4tgv@rumpleteazer.net>
- Date: Fri, 05 Sep 2008 13:29:36 +1000
- Hello all, Forgive me if this sounds like a silly suggestion, I have been a long time lurker on this list. I am slowly building up my Topband capability which is somewhat of a challenge on a 400 squa
- /archives//html/Topband/2008-09/msg00008.html (7,328 bytes)
- 2. Re: Topband: Vertical question (score: 1)
- Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
- Date: Fri, 5 Sep 2008 09:25:00 -0400
- "I want to use it for 80m as well, but avoid lossy trap arrangements." Traps aren't necessarily lossy. Good ones have extremely low loss. If you had horizontal space, you might do a 160m/80m inverted
- /archives//html/Topband/2008-09/msg00009.html (11,354 bytes)
- 3. Re: Topband: Vertical question (score: 1)
- Author: "Jim Brown" <jim@audiosystemsgroup.com>
- Date: Fri, 05 Sep 2008 06:34:12 -0700
- almost That's because twinlead is a BAD way to feed a vertical, which has a rather low impedance at resonance. What you DO need is some means of resonating it on 160 -- that is, making it electricall
- /archives//html/Topband/2008-09/msg00010.html (9,252 bytes)
- 4. Re: Topband: Vertical question (score: 1)
- Author: "George \(K8GG\) & Marijke Guerin" <gmguerin@voyager.net>
- Date: Fri, 5 Sep 2008 11:36:23 -0400
- At the risk of repeating some information in the archives, I offer the following: 1. Feed the 18 meter vertical for 80 meters with coax and only use the tuner to flatten the SWR at the ham shack. The
- /archives//html/Topband/2008-09/msg00011.html (9,192 bytes)
- 5. Re: Topband: Vertical question (score: 1)
- Author: "Rick Karlquist" <richard@karlquist.com>
- Date: Fri, 5 Sep 2008 10:26:25 -0700 (PDT)
- The only way to do this is to do what I do, which is to have a 450 ohm balanced to 50 ohm balanced transformer at the antenna, and operate the open wire line at fairly low SWR. Any 160 meter vertical
- /archives//html/Topband/2008-09/msg00012.html (8,128 bytes)
- 6. Re: Topband: Vertical Question (score: 1)
- Author: Jim Murray <adkmurray@yahoo.com>
- Date: Fri, 5 Sep 2008 15:41:00 -0700 (PDT)
- Any 160 meter vertical can also be driven on 80 meters as a voltage fed antenna. You just need a different matching network at the base. You don't need a trap. Traps only become necessary if you wa
- /archives//html/Topband/2008-09/msg00013.html (7,558 bytes)
- 7. Re: Topband: Vertical Question (score: 1)
- Author: "Rick Karlquist" <richard@karlquist.com>
- Date: Fri, 5 Sep 2008 17:12:28 -0700 (PDT)
- In general, a vertical or inverted L, with or without top loading, that is resonant on 160 meters with a low (<50 ohm) input impedance will also be resonant on 80 meters, but with a high (>1000 ohms)
- /archives//html/Topband/2008-09/msg00014.html (9,032 bytes)
- 8. Re: Topband: Vertical Question (score: 1)
- Author: Jim Murray <adkmurray@yahoo.com>
- Date: Fri, 5 Sep 2008 21:26:42 -0700 (PDT)
- Many thanks Rick for that well written explanation. I guess it's a matter of getting back to basic electronics. If I could just remember that far back - hi. 73, Jim, k2hn _________________________
- /archives//html/Topband/2008-09/msg00015.html (7,416 bytes)
- 9. Topband: Vertical question (score: 1)
- Author: "Paul Marbourg" <zborg@comcast.net>
- Date: Sat, 6 Sep 2008 10:41:21 -0700
- Hi Peter, I use a homebrew short vertical for 160 meters modeled with EZNEC software prior to erection. I live in the big city on a very small lot, so space is at a premium here as well. My antenna i
- /archives//html/Topband/2008-09/msg00016.html (9,021 bytes)
- 10. Re: Topband: Vertical question (score: 1)
- Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
- Date: Sat, 6 Sep 2008 20:17:43 -0400
- This is absolutely my choice whenever I can use it...possibly first and foremost because it's nearly free. You just need one more little homemade coil of wire, you tweak the coil tap on the big indu
- /archives//html/Topband/2008-09/msg00018.html (8,116 bytes)
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