Topband: Real time band conditions
Look for an instructions button down the page interesting site. 72, Jim Rodenkirch K9JWV _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: Real time band conditions
http://www.bandconditions.com/ Look for an instructions button down the page interesting site. 72, Jim Rodenkirch K9JWV _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Real time band conditions
After the ARRL centennial of last year, I think the JA's are the real experts on all the possible paths to the USA, and every sliver of every possible opening. I was especially impressed with their ability to use especially 30M/17M/12M openings. I have just recently discovered the 40M opening from east coast of USA to Asia in our late afternoon. (Frank, I have had some encouragement from Rol in particular). This is despite me thinking of 40M as my home stomping ground for a third of a century. How did I discover it? In RTTY RU weekend before last, I called CQ about 4PM in the afternoon, thinking it'll be good to get some local east coast QSO's in well before the band goes long. And who called me back before the band went long? JA's did!!! Tim N3QE On Mon, Jan 12, 2015 at 8:36 AM, James Rodenkirch rodenkirch_...@msn.com wrote: Look for an instructions button down the page interesting site. 72, Jim Rodenkirch K9JWV _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: 160m L and 80m Vertical
Hi Thanks to everyone who sent me replies, I havn't had time to reply to them all, I have a plan in place and will report back when I get it up and running, 73 Trevor EI2GLB - Original Message - From: MR TREVOR DUNNE ei2...@eircom.net To: topband List topband@contesting.com Sent: Monday, 29 December, 2014 12:39:43 AM Subject: Topband: 160m L and 80m Vertical Hi All I need some help in trying to get an antenna that will cover both 80 and 160, What I was planning is a Inverted L with a 75 ft Vertical section of Aluminum tube and the rest tied off to a convenient tree, what I would like to add is a 80m vertical wire spaced off the main aluminum element of the L, Would this work and what sort of spacing would I need, could I feed both on the same feedline ??? Thanks Trevor EI2GLB _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Looking for 160m narrow beam RX advice - aninteresting com
Actually you could go back and forth with the two boxes, like nulling a phasing SSB rig that has two balanced modulators, and have it work in most cases under the criteria given. The reason this would likely work is there are two sense antennas, each one close to an independent source. Each independent sense antenna must be significantly closer to each independent source, and if we do that, it will likely work. With a single nuller, it will almost certainly not work because each noise source has a different phase shift and level to the main antenna. There MUST be a way to independently set level and phase for each sense antenna. - Original Message - From: Rob Atkinson ranchoro...@gmail.com To: topband@contesting.com Sent: Monday, January 12, 2015 12:39 PM Subject: Re: Topband: Looking for 160m narrow beam RX advice - aninteresting com 1. I can see the case for an array of loops. However, wouldn't it be less time-consuming --not to mention less expensive-- to just get an additional MFJ-1026 to effectively null the second noise source? Null out one noise in the first 1026, and then null out the second noise source in the second 1026? (If not in this case, then in other situations?) That won't work. Think about it. You null noise source 1 with one box and feed that to the second box and you use that box to null noise source 2, but noise source 1 is going to come in on the noise source 2 pickup antenna and appear in the receiver front end. The only effective method is to use loop stick antennas oriented so as to null one noise source then use the phase-shifting-nulling network to null the second noise source. If you have three noise sources you are sunk. We may as well face it--we're screwed. Unless you reside in the sticks with about 500 feet all around your antennas, 160 is no longer a weak signal band for you. You can still operate it, but you won't be able to work anyone unless they have a strong signal. 73 Rob K5UJ _ Topband Reflector Archives - http://www.contesting.com/_topband - No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4800 / Virus Database: 4257/8916 - Release Date: 01/12/15 _ Topband Reflector Archives - http://www.contesting.com/_topband
