Two options for an antenna - AntennaRestrictions Forum at eHam.net

$\'\'$

$\'\'$

$\'\'$

eHam.net Forum : AntennaRestrictions : Two options for an antenna

Forum Help

1-6 of 6 messages

Page 1 of 1

Two options for an antenna	Reply
by CHARLOTTE001 on November 9, 2006	Mail this to a friend!
This is more or less following on from my post regarding my earlier post. I have two options to build an antenna outside 1: get a cheap collapsible fishing pole that extends to around 15m wind copper wire around it and run this to an ATU bringing it in in the morning and putting it out in the dark and at weekends. 2: get a length of copper wire and run it horizontally along the wall say two or three lenghts as I cannot run it vertically nor do I have anything to connect it to anything else and earthing it descreatly behind a drain pipe. On number 1: can anyone let me know if I would need to wind the wire all the way down or just a proportion of the sections. On number 2: Would horizontally connected on the wall be ok and would multi layers (in an S pattern)do anything or just one length at around 50 feet Give me your views and points M3OYE charlotte

RE: Two options for an antenna	Reply
by N3OX on November 9, 2006	Mail this to a friend!
If you're going to use an ATU, use a long quasi-straight wire in either case. Don't wrap too many turns on the fishing pole or fold over the wire a lot on the wall; it gains you nothing as far as radiating effectiveness, and you're just matching random impedances anyway. The fishing pole idea is going to need a ground system, a good set of radials or something, which doesn't exactly deploy easily on evenings and weekends. Maybe you could use a handful of elevated, tuned (1/4 wavelength) radials inside the apartment... just be careful of the high RF fields and the high voltages at the ends if you do so. Don't start with a lot of power! The vertical is likely to work better than the 10 foot high horizontal antenna as long as you can throw together some sort of decent RF ground. 73 and good luck, Dan

RE: Two options for an antenna	Reply
by WB2WIK on November 10, 2006	Mail this to a friend!
I wouldn't recommend either of these as a real solution. I already recommended a couple of "stealth" real solutions in the other posting...a tunable magnetic loop which is very small and looks nothing like an antenna, so it can be hung just about anywhere -- call it a bird feeder or a plant hanger -- and a loop tuner which can be used with ANY piece of wire that can be physically formed into a loop. Problem with a single-ended antenna (whip, end-fed, whatever) is that the earthing system is vitally important, and if you cannot install a good one, the antenna won't work. A ground rod driven into the ground is a very minimal earthing -- it usually takes much more than this. A loop doesn't require any sort of earthing at all, and can be installed anywhere, including wrapped around your window frame and painted to match.

RE: Two options for an antenna	Reply
by N3OX on November 11, 2006	Mail this to a friend!
"Problem with a single-ended antenna (whip, end-fed, whatever) is that the earthing system is vitally important, and if you cannot install a good one, the antenna won't work. " True! Dan

RE: Two options for an antenna	Reply
by KF4ZGZ on December 4, 2006	Mail this to a friend!
Corner to corner of your property will give you roughly 60 feet. Stretch an 88ft. dipole across here and let the extra length hang down at the ends. Should do 40m-10m well and work on 80m Matt

RE: Two options for an antenna	Reply
by N5LRZ on December 19, 2006	Mail this to a friend!
In addition, you seem to be limiting yourself way too much. Draw out, to reasonable scale, your house and lot. Note distances, and fixed objects as well as their height. Fill in all fences, trees, sheds, etc as well as making notes as to the compostion of roofs and siding of structures. LOOKING at all this information THINK CREATIVELY. Will a loop fit here. Can I vine a wire up that tree so it looks like a real vine? Will this antenna fit here or perhaps over there? That cloths line, can I put a center insulator and feed it with ladder line? For a specific example to my back yard. I have a 150 foot lot. I wanted a 160 meter wire antenna but did not have enough space for a full length dipole. BUT I did have a 60 foot pine tree in a corner so I shot a line/rope up to the top and pulled up an inverted L antenna. Now its not as good as the dipole I wanted but its still a heck of a lot better than nothing at all. There are always possibilities. Think creatively, very creatively. Do not be afraid to experiment. N5LRZ

Page 1 of 1

Next Topic: Fritzel Antenna
Previous Topic: Serious antenna restrictions

Email Subscription
You are not subscribed to this topic.

Check our help page for help using Forum, or send questions, comments, or suggestions to the Forum Manager.

$\'\'$