10-24-2020, 07:05 PM
Hi Kevin,
10' isn't very much at all !!! If we were to do the math for the broadcast band just in rough numbers you figure wavelength in meters x3 to = feet and that will give you an idea. So 1600kc= 200mtrs = abt 600' , 10' your cute!
Here's the practical side of things. A single wire ant will work but it's not the greatest thing since sliced bread. A better way to go is a dipole ant if you have the space. It is two wires that are connected to the radio thru a feed line at it's mid point. Ignore the 1/4 wave length, if you can get 50 or 60' each side of center that's fine. Insulators can be a short piece of 1/2" pvc pipe a hole drilled in each end. I put up one here that is 125' long and is up 8'. Wish it was up 80' but I'm on the small lot so five 1"x2"x8' furring furring strips were the supports. They were tethered with rope to the fence which borders the lot. 60' across the back and about 35' up each side of the lot. Have about 40' from the back of the house to the antenna so I used RG-58 coax. For your application it's ok but it does offer a bit of an impedance mismatch. It's 50 ohms and the set is about 300 ohms. In the big scheme of thing it pretty negligible but if you can't sleep at night over it you can build or buy a transformer called a balun. It's simple and cheap.
[Image: https://www.kingscountyradioclub.com/wp-...Dipole.png]
10' isn't very much at all !!! If we were to do the math for the broadcast band just in rough numbers you figure wavelength in meters x3 to = feet and that will give you an idea. So 1600kc= 200mtrs = abt 600' , 10' your cute!
Here's the practical side of things. A single wire ant will work but it's not the greatest thing since sliced bread. A better way to go is a dipole ant if you have the space. It is two wires that are connected to the radio thru a feed line at it's mid point. Ignore the 1/4 wave length, if you can get 50 or 60' each side of center that's fine. Insulators can be a short piece of 1/2" pvc pipe a hole drilled in each end. I put up one here that is 125' long and is up 8'. Wish it was up 80' but I'm on the small lot so five 1"x2"x8' furring furring strips were the supports. They were tethered with rope to the fence which borders the lot. 60' across the back and about 35' up each side of the lot. Have about 40' from the back of the house to the antenna so I used RG-58 coax. For your application it's ok but it does offer a bit of an impedance mismatch. It's 50 ohms and the set is about 300 ohms. In the big scheme of thing it pretty negligible but if you can't sleep at night over it you can build or buy a transformer called a balun. It's simple and cheap.
[Image: https://www.kingscountyradioclub.com/wp-...Dipole.png]
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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