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Re: [softrock40] Antennas

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  • Sid Boyce
    Failures can be fun when it just involves wire that can be reused. Mess up a beam or a quad antenna and it s no fun at all. I know that from a quad that kept
    Message 1 of 10 , Jan 3, 2011
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      Failures can be fun when it just involves wire that can be reused. Mess
      up a beam or a quad antenna and it's no fun at all. I know that from a
      quad that kept collapsing even before I put it up. The Lightning Bolt
      quad I have had up for over 26 years was the real fun part.
      73 ... Sid.

      On 04/01/11 01:36, John Williams wrote:
      > Sid,
      > You sound like a good bloke to sit down in a pub to enjoy a pint of ale
      > as you tell stories of antennas that should not work - but did!
      > Thanks for the entertaining reply,
      > A yank named John - KE5SSH
      > PSS - what tuners work well for QRP ops?
      > On 1/2/2011 8:19 PM, Sid Boyce wrote:
      >> If the weather is the problem with an outdoor antenna, a temporary
      >> antenna in the attic or just slung over the roof top won't be the best
      >> solution, but better than nothing.
      >> When I first moved to this QTH I put a W8JK made of 300 ohm ribbon in
      >> the loft and enjoyed many contacts between the UK and Stateside on 20m
      >> and 10m with only 7W to a tuner, prompting one contact in New York to
      >> repeat my working conditions and asking me incredulously to confirm.
      >> The next antenna at the suggestion of a Stateside contact, a wire loop
      >> slung over the roof and fed in the centre with 300 ohm ribbon to a
      >> tuner. No measurement of length or check of symmetry was made. It wasn't
      >> too good for Stateside but it worked a treat to the RAFARS net in Cyprus.
      >> I made a magnetic loop from 3/8" soft copper tubing tuned with a
      >> capacitor a little more wide spaced than a normal receiving capacitor
      >> and with 7W on 40m before it arced over I was able to work as far east
      >> as the Urals with it indoors on the landing upstairs. With soldering
      >> iron in hand building a rig and listening to UK hams on 80m - using a
      >> G5RV dog-legged around the eaves and down the garden, a discussion of
      >> magloops was in progress, so I joined in and was simply recommended to
      >> get some copper and build one, 2 days later it was on the air.
      >> Everyone of my 80m Stateside contacts have been with a 13' diameter
      >> magloop and 100W SSB. It was put together with 8 lengths of 28mm copper
      >> and 45 degree elbows, tuned with a vacuum cap. Sadly it succumbed to
      >> high winds, but I have in mind putting it up again when I figure it out,
      >> perhaps placing the vacuum capacitor at the bottom of the loop this time
      >> to lessen the wind resistance. I've done this with the current magloop
      >> for 80/40 using 22mm copper and 8' in diameter.
      >> The only complete failure I ever experienced was a 80m antenna wound on
      >> a 3' length of 22mm diameter PVC tube with a top hat made of aluminium
      >> about 6" or 8" in diameter. Absolutely nothing heard, then I put the 80m
      >> radial I had run around the floor of the rooms upstairs into the antenna
      >> socket and bingo! I called the editor of Practical Wireless who said he
      >> was baffled as it worked for them before they published the article.
      >> Antennas are fun and it's amazing what will work. It's a good idea to
      >> check the web/ARRL pubs, solutions are endless.
      >> 73 ... Sid.
      >> On 02/01/11 20:20, Mike WA8BXN wrote:
      >>> John,
      >>> I have a 130 foot dipole fed with ladder line and use a tuner. Considering
      >>> the weather, I would pick a length for the dipole that is a bit less than
      >>> the distance between two easy to use supports (trees) you have. I would try
      >>> make it at least 100 feet long if you want good results on 80 meters. Of
      >>> course, getting your antenna up as high as possible is generally good. Still
      >>> you can get good results with a low antenna for now. Get it up at least high
      >>> enough that deer (or cows) won't run into it! A balanced line tuner would
      >>> be best, but any tuner with a balun at the tuner going to the ladder line
      >>> will do.
      >>> Just about anything along these lines will do better than an antenna in the
      >>> attic. I get good results with my antenna at about 20-25 feet (it slopes a
      >>> bit) running 5 watts.
      >>> 73/72 - Mike WA8BXN
      >>> -------Original Message-------
      >>> From: John Williams
      >>> Date: 1/2/2011 2:57:57 PM
      >>> To: softrock40@yahoogroups.com<mailto:softrock40%40yahoogroups.com>
      >>> Subject: Re: [softrock40] Antennas
      >>> Given that I can go outside, and given that I want to stay around 20-30
      >>> watts, is there an optimal single antenna design (with or without a tuner)
      >>> to run 80-20meters at a fairly low wattage?
      >>> I will also probably experiment with digital in addition to phone. Just
      >>> installed some psk31 programs from the Ubuntu app store and they look
      >>> interesting to play around with. This will be fun!
      >>> John
      > ------------------------------------
      > Yahoo! Groups Links

      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
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