Pruned today, 1.2:1 worst-Fan Dipole Combos...?
- Floyd n the group. I put my analyzer to work today, my find from the Salem meet. I now have the 40, 30, 20, 10 meter dipoles at 1.2:1 or better on the PSK frequencies. So, no tuner needed for the PSK at all, and with CW just below, and RTTY just above, the tuners only need to be used for SSB, my least used mode.I had taken readings on a very dry day last week, and in the rain today, they were the same, so a wet roof makes no diff in the SWR, though it could, in theory, effect radiation patterns.This eve is the SSB sprint, think I will give that a try. Thanks for advice, will see how 40 goes as the sun cycle goes low. I just see so little on 40 and 30 PSK and SSB, maybe PSK is mainly a 20m thing. - Mr Bob
From: "floftis@..." <floftis@...>
Sent: Saturday, March 16, 2013 1:11 PM
Subject: Re: [cascadeqrp] Fan Dipole Combos...?
BobIf you have done a best effort to try and get all the wire to play as best you can for swr on each band there is nothing like just putting it up and giving it a try. If it's going to be in one place andhight for a while the next thing is to look at the bands at different times to see how it plays. was just looking at a report saying the sun spots were a mixed bag this week so you havedifferent thing going on. this is not a good time of year for 40 as it's changing into summer. But in the long run its best to just put it up and give it a try a few times you never know youmay have the best antenna going upto now.FloydK7POSFrom: "Bob C. and/or Pamela D." <pambob73@...>
To: "Art Home" <fraser8028@...>, "pambob73" <pambob73@...>, "QRP Club" <email@example.com>
Sent: Friday, March 15, 2013 8:06:26 PM
Subject: [cascadeqrp] Fan Dipole Combos...?
Group - Question (oh-oh, antenna theory/religion question).Does a fan dipole for 40/30/20/10 meters include bad combos?The article below says 80/30, no good, use 80 for both; and 40/15 no good, use 40 for both. But mine is 40/30/20/10, so with no 80 m dipole to mess with the 30, might I be ok?I could find NO other articles that discussed limits of combos.Phil wisely says "Put it up and see if it works" I have crappy luck on 40, and 30 is no wonder band either, so wondered if that was it, or if my dipole is just too low (25'), or is 40 just BAD now. - Bob"You might also consider removing HF combinations such as 40/15 meters and 80/30 meters.
For these cases, cut the element for the lower frequency and let it serve double duty at the odd harmonic. In other words, cut the 40 meter element and let it serve also as the 15 meter element which eliminates the 15 meter section. In theory, we could fashion a four-wire antenna for the 80, 40, (30), 20, (15) and 10-meter bands, 80 does 30, 40 does 15.