Copper Talk » Ask The Tech » Antennas » Base Antenna Question « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Dcrusty
New member
Username: Dcrusty

Post Number: 9
Registered: 2-2005
Posted on Tuesday, October 11, 2005 - 10:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Years ago when we where building our own 4-6 element yagi's we used to flip them between horiz/ vert. with a mast mounted rotor.My question is can this be done with a quad? I have never seen it,maybe it does not work with a quad. But that would be a way to have the best of both worlds and only have one run of coax. Any ideas? Dcrusty
Top of pagePrevious messageNext messageBottom of page Link to this message

Tech833
Moderator
Username: Tech833

Post Number: 1064
Registered: 8-2002
Posted on Wednesday, October 12, 2005 - 12:48 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Yes, it would work.
Top of pagePrevious messageNext messageBottom of page Link to this message

Beeker7104
Junior Member
Username: Beeker7104

Post Number: 20
Registered: 12-2004


Posted on Thursday, October 13, 2005 - 3:02 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hey tech833......Ever tried an old queen sized metal box spring set as a make shift beam? I did....and I was very impressed. Using only a bone stock washington base station radio I was successful talking to the southern most part of my home state here in ohio.
Top of pagePrevious messageNext messageBottom of page Link to this message

Chad
Intermediate Member
Username: Chad

Post Number: 488
Registered: 11-2004


Posted on Thursday, October 13, 2005 - 8:58 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

That wasn't fun to hike up the tower :-)
Top of pagePrevious messageNext messageBottom of page Link to this message

Beeker7104
Junior Member
Username: Beeker7104

Post Number: 37
Registered: 12-2004


Posted on Friday, October 14, 2005 - 9:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Nah,I just set in on top of house, then propped it up on the chimney.
Top of pagePrevious messageNext messageBottom of page Link to this message

Tech833
Moderator
Username: Tech833

Post Number: 1067
Registered: 8-2002
Posted on Saturday, October 15, 2005 - 10:42 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have heard of hams loading up all sorts of stuff for an antenna. If you can induce RF current into something, it will work. The question is, where is the RF going, and how much of it is lost!
Top of pagePrevious messageNext messageBottom of page Link to this message

Marconi
Intermediate Member
Username: Marconi

Post Number: 439
Registered: 11-2001


Posted on Saturday, October 15, 2005 - 12:23 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

7104, whatever gave you the idea to drag boxed springs up on your roof to use as a CB antenna?
Did you get any comments from your neighbors?

Could you tell us how you hooked it all up so it would work?
Top of pagePrevious messageNext messageBottom of page Link to this message

Hollowpoint445
Advanced Member
Username: Hollowpoint445

Post Number: 823
Registered: 6-2004
Posted on Saturday, October 15, 2005 - 4:19 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I guess you don't live in hurricane or tornado country!

I heard a guy once claim that he was using his chain link fence as an antenna - supposedly because he was running so much power no antenna could handle it.

If it's metal you can load it up, but like Tech833 mentioned, it's all about efficiency.
Top of pagePrevious messageNext messageBottom of page Link to this message

Marconi
Intermediate Member
Username: Marconi

Post Number: 440
Registered: 11-2001


Posted on Saturday, October 15, 2005 - 6:58 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Boy, this is gettin' good now. I know a guy that loaded up a railroad track back of his house and had a 1200 mile longwire. :-)
Top of pagePrevious messageNext messageBottom of page Link to this message

Patzerozero
Senior Member
Username: Patzerozero

Post Number: 1689
Registered: 7-2004


Posted on Saturday, October 15, 2005 - 7:09 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

read a story about the military loading up a TREE as an antenna...yes, WOOD...
Top of pagePrevious messageNext messageBottom of page Link to this message

Hollowpoint445
Advanced Member
Username: Hollowpoint445

Post Number: 827
Registered: 6-2004
Posted on Saturday, October 15, 2005 - 7:56 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Marconi - I understand it was common for the railroad telegraph operators to spend their down time playing with other receivers connected the same antenna that their telegraphs were connected - the rails themselves.
Top of pagePrevious messageNext messageBottom of page Link to this message

Outkast
Junior Member
Username: Outkast

Post Number: 32
Registered: 9-2005


Posted on Sunday, October 16, 2005 - 2:43 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hmm Railroad huh? I live really close to the tracks. LOL I am thinking I might need one heck of a tunner or something though.

Outkast

CEF 650
Top of pagePrevious messageNext messageBottom of page Link to this message

Dcrusty
Junior Member
Username: Dcrusty

Post Number: 10
Registered: 2-2005
Posted on Monday, October 17, 2005 - 11:33 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Boy did this post go south!!!! I was just wondering if anybody fliped their quad between hortz/vert. and what kind of results they got? Bedsprings, railroad tracks,Hum, maybe I need to move.Marconi, I posted in another section that we were assemblying a s/e two element quad and we were having trouble with the hortz. swr. The vertical was fine.You stated in the same post that you believed you knew what the problem was but never posted it. We are still have problems with it and we sure could us some advice.We even went so far an removed the driven element, restreched the wire and made sure all the dim. were correct.Still at a 1.9 swr on 27.205 Any ideas? Thanks, dcrusty
Top of pagePrevious messageNext messageBottom of page Link to this message

Marconi
Intermediate Member
Username: Marconi

Post Number: 449
Registered: 11-2001


Posted on Friday, October 21, 2005 - 7:01 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok Archie try this. Remove the tip of the transformer wire from one side of the loop and tune the other side as though it was the only feed point. If everything is right, then this process should go smoothly because we have no possible interference from another feeder system attached to the loop. Now reconnect the other side. If the first side was in fact tuned as we would hope then the remaining side should only see a pure isolation from the correctly tune feed point on the loop. Now when you tune the remaining side you are tuning against a known variable that should be non-reactive. A variable that should be truly transparent to the remaining untuned side as it is excited. The remaining tune should also go smoothly.

Remember, in order for both sides of this antenna to be well matched within the minimum range for SWR noted by the inventor, the excited port must see a high isolation from the opposite system on the loop. If the feeders and the wire loop are not in sink, then proper isolation is disrupted.

It is my conclusion that if isolation is disrupted by one errant port on the wire loop then the wire loop appears longer to the port that is excited and being tuned.

Eddie
Top of pagePrevious messageNext messageBottom of page Link to this message

Hotwire
Advanced Member
Username: Hotwire

Post Number: 648
Registered: 1-2005
Posted on Monday, October 24, 2005 - 12:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Back when I first started as a kid there was a cber in the nieghborhood who was grounded to a train track until he got caught. He had a cable buried and the track maintence guys ripped it all out followed it right to his house.
Claimed that his swr was 1.1 and he could really tell it was alot better than say just a ground rod. I doubt you could ever transmit off a rail.
Top of pagePrevious messageNext messageBottom of page Link to this message

Marconi
Intermediate Member
Username: Marconi

Post Number: 452
Registered: 11-2001


Posted on Monday, October 24, 2005 - 6:05 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You are right Hotwire, RR tracks will not make a good ground nor an antenna. Regrettably I was ribbing Beeker a bit and being silly.

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: