Home |
Search |
Today's Posts |
#9
|
|||
|
|||
Tony Meloche wrote:
CW wrote: I won't go into detail but the broomstick (or any helicaly wound antenna) gives up performance for size. The straiter the wire, the better off you are. If you have the space, just stretch it out strait. snip If you can tuck a one-meter broomstick into your car somewhere for traveling, you've got the world by the butt for shortwave listening away from home. But at home - your "permanent space" - go with a random or longwire, if you possibly can. Tony For portable use, I've found the AT-271/A antenna designed for the PRC-25 or PRC-77 works quite well. It's about 10' long, and it's set up like the supports used for dome tents - to take it down - you pull the sections apart (they have a chain/shock cord running through them) and fold them for storage. I got it he http://www.american-milspec.com/c765.html Unfortunately, it's just a hair too long to fit inside the aluminum attaché case I transport my 7030 in. Personally, I think I'd use a slinky over a broom stick. More compact for travel, and if you have more room, you can spread it out. "Dave" wrote in message ... I just got through picking up a ton of discontinued wire from my local Home Depot, and was planning on building a "broomstick" antenna like some I found described on the net. Got a question though: doesn't "stretching out" the coil to a meter or more reduce the inductance of the resulting coil? Why wouldn't it work better to just leave it on the spool? I was under the impression that the formula for calculating the inductance for a given coil involved multiplying the square of the number of coils by the ratio of the coil width to length. Wouldn't this mean that a "longer" coil would have a lower inductance than a "shorter" coil, given the same length of wire and approximate diameter of coils? Forgive me if I'm being stupid here, it has been twenty years since I have attempted anything like this, but that was what I thought. The main account I am thinking of was related by someone in Saudi Arabia who wrapped 1.2 kM of wire around a piece of PVC and vastly improved their reception of WWV in the states. I was going to do something similar, and then looked at the two spools of wire that I was about to unwrap. They are already coils, so shouldn't I be able to just hook them up to an aligator clip and stick this to my whip antenna? (I am now thinking about taking the wire off of the smaller spool and adding it to the larger. Shouldn't that work?) And if I leave the wire on the spools (which are plastic) couldn't I turn them toward or away from the station of interest to further improve reception? (I could even put this in my attic, gaining a few feet of elevation and hiding it from my unappreciative wife.) Any input on any part of this idea is more than welcome. I would greaty value the opinions of those who have actually done something like one of these two options. Thanks, Dave ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
Colinear 2 meter antenna question | Antenna | |||
The "TRICK" to TV 'type' Coax Cable [Shielded] SWL Loop Antennas {RHF} | Antenna | |||
Linear Loading Loop Antenna | Antenna | |||
Poor quality low + High TV channels? How much dB in Preamp? | Antenna |