On 9/10/05, Martin Gillen <[EMAIL PROTECTED]> wrote:
>
> I know that coax can be looped around 5 times to
> create
> a balun near the dipole feedpoint. Can twisted pair
> be looped around to create a balun also?
Sure, a 1:1 choke balun can be made with twinlead as well as coax feedline.
I've
Martin,
I went up in my attic with a ruler and this is what I found for some feed
lines I made:
#24 stranded, silver plated teflon insulted, with about one twist per inch.
#26 , same type, about two twists per inch.
#28 solid, silver plated teflon insulated wire wrap wire about one twist
pe
I sometimes carry a balun, either the BL1 or the K5OOR binocular core
one, and the test I use is simple enough: if I find signals get better
when I put my hand on the KX1 I use it, but only when I use twinlead,
not with the wires directly connected. If you have to bring the
feedline with you t
How can you measure that a balun is being effective?
Thanks,
Martin.
That's a very good question. BTW, I'm the guy Dan worked the other night
when we had this conversation on 40m - good to work you, Dan.
There are 3 reasons I've never used a balun with my standard "field kit"
consisting of
Hi, Chuck.
I have a question about your feedline:
> I have made up some feedline using #28 teflon
insulated
> solid wire wrap wire held together with heat shrink
> tubing. The characteristic impedance is not
important and
> it is low loss. I measured some #26 twisted pair
once and
> it's impe
Dan,
Here's another idea. Use a short length of coax like 1' or less of RG-58
or better RG-174, and put some ferrite beads around the coax to make a 1:1
balun. On the antenna side it is balanced, so solder this to the ladder
line. I hope you are at least using the small 300 ohm ladder lin
... One thing that is
certain, use a current type balun, the voltage type balun will not handle
reactive feedpoint impedances very well, where the current type
(particularly the 1:1 balun) will handle it much better (note that
everything is a compromise when multiband antennas are addressed).
Th
Dan,
Actually, in my experience, the tuner could care less whether the load is
balanced or unbalanced, it will just do its best job of matching the
impedance it sees regardless of balance.
OTOH, if you are concerned about radiation patterns, or 'RF-in-the-shack',
it would be prudent to install a
Hi Dan,
I would just use the dipole. If you want a balun just coil up about 5 turns
of the coax (use RG-8x) near the "T" of the antenna in about a six inch
diameter and tape the coil together. I think that’s what Louis Varney (Mr.
G5RV) recommended for his antenna. I have a picture of it on my 4
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