10-25-2020, 03:41 PM
>So the leads on the coaxial cable are going to both be attached to the antenna terminal on the chassis?
Correct. Center conductor connects to the ant post and the shield connects to the gnd or chassis.
>What would be ideal lengths on each end of the dipole?
Well there is ideal and practical. Ideal would be about 1500' up about 150' in the air but it's not very practical for many reasons. Practical is what you can do with what you have. If you can get a total of 100 or 150' in length you're doing good. Height the higher the better.
>Could this be run under the eaves on the house?
You could. The only thing to watch out for is metal. Things like flashing and stuff can degrade the performance so if you can keep it several inches away from the metal that's great.
>Would need to protect from lightning with a ground rod also.
It's probably not a bad idea. I don't over here in PA. My ants aren't very high and we don't get much lightning. A ground rod is a good idea not necessarily for lightning but being isolated from the noise of the house's ground system.
>Don't think have room for 600 ft.
I don't know that most of use do... I'm on a 100'x60' lot so putting up anything that is resonant below about 3.5 mc. is tough.
>I assume the copper stranded wire is in shielded?
Ok the basics are this. Two kind of wire solid just one piece of solid copper like the wire use when wiring a house. Stranded no it doesn't mean it's stuck and can't get off the island. Sorry just a little wire humor. It has many small thin pieces of copper wire to make up one larger diameter piece, typically twisted together. In the case of coax the center conductor can be solid or stranded it varies. The outside shield is stranded but is woven like a shoe lace. This permits the center conductor to be thru the shield aka braid. But no the wire that is used from the insulator to the center that sez stranded wire is not shielded.
With all of the dipole stuff being said here's something that is simple that can be put together in an afternoon. There are LOTS of different designs for antennas. But here is the practical side of things. Outside wire ants are great for picking up massive amounts of signals. Now at the outset that sound good. But what if some of those signals are interfering with the signals you want to hear?? Some folk have wire antennas that favor different directions. One ant favors n/s the other e/w. It's a barrel of laffs fixing them after a wind storm or a fallen branch or two.
This might be something fun to tryout. I wound downsize it by 30% or so as it's resonant frequency is abt 950kc. The deal is this you can add capacitance to lower the resonant frequency. This one has too many turns if you add capacitance it just lowers the frequency. Plus the fact it ginormous. Does a good job at nulling weaker stations on the same frequency. https://philcoradio.com/phorum/showthread.php?tid=19735
Correct. Center conductor connects to the ant post and the shield connects to the gnd or chassis.
>What would be ideal lengths on each end of the dipole?
Well there is ideal and practical. Ideal would be about 1500' up about 150' in the air but it's not very practical for many reasons. Practical is what you can do with what you have. If you can get a total of 100 or 150' in length you're doing good. Height the higher the better.
>Could this be run under the eaves on the house?
You could. The only thing to watch out for is metal. Things like flashing and stuff can degrade the performance so if you can keep it several inches away from the metal that's great.
>Would need to protect from lightning with a ground rod also.
It's probably not a bad idea. I don't over here in PA. My ants aren't very high and we don't get much lightning. A ground rod is a good idea not necessarily for lightning but being isolated from the noise of the house's ground system.
>Don't think have room for 600 ft.
I don't know that most of use do... I'm on a 100'x60' lot so putting up anything that is resonant below about 3.5 mc. is tough.
>I assume the copper stranded wire is in shielded?
Ok the basics are this. Two kind of wire solid just one piece of solid copper like the wire use when wiring a house. Stranded no it doesn't mean it's stuck and can't get off the island. Sorry just a little wire humor. It has many small thin pieces of copper wire to make up one larger diameter piece, typically twisted together. In the case of coax the center conductor can be solid or stranded it varies. The outside shield is stranded but is woven like a shoe lace. This permits the center conductor to be thru the shield aka braid. But no the wire that is used from the insulator to the center that sez stranded wire is not shielded.
With all of the dipole stuff being said here's something that is simple that can be put together in an afternoon. There are LOTS of different designs for antennas. But here is the practical side of things. Outside wire ants are great for picking up massive amounts of signals. Now at the outset that sound good. But what if some of those signals are interfering with the signals you want to hear?? Some folk have wire antennas that favor different directions. One ant favors n/s the other e/w. It's a barrel of laffs fixing them after a wind storm or a fallen branch or two.
This might be something fun to tryout. I wound downsize it by 30% or so as it's resonant frequency is abt 950kc. The deal is this you can add capacitance to lower the resonant frequency. This one has too many turns if you add capacitance it just lowers the frequency. Plus the fact it ginormous. Does a good job at nulling weaker stations on the same frequency. https://philcoradio.com/phorum/showthread.php?tid=19735
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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