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Sort of like the "terminated tilted folded dipole" - which of course, works great for the military because with ALE nobody ain't got no time for antenna tuners or all that, and the huge losses are just overcome with mo powa.Quote:
Originally Posted by KJ6BSO
Might make a fairly good sub-terranian antenna.
Matt
Cantenna!
I get excellent results 160-10m with a lightbulb for an antenna. However I have yet to make a contact with the bulb.
Slacker...Quote:
Originally Posted by n2ize
http://www.ok1rr.com/index.php/anten...erything-works
"Might make a fairly good sub-terranian antenna."
Yeah, raise the antenna for sky wave, bury the antenna for ground wave. Uh huh, that's how ya do it, uh huh.
I recognized that golden metal box immediately, a wire wound power resistor made to be mounted on a heat sink. I used to work with them and measured a fair amount of inductance when I got curious. Maybe on the antenna it's a loading coil? Just could be, ayup.
The resistor will dissipate ( depending on the band used) some or more R.F. and lower the SWR that way.
The grounded section makes sure the SWR will stay low but efficiency? 25 to maybe 75% through the 20 meter or 66 feet section that radiates.
As I said before, for some without a good reference antenna he /she will state it is a magic antenna, till he / she puts up a decent dipole at reasonable height.
Don't forget conditions can vary 60 - 100 dB much mor as the difference between this piece of crap and a decent dipole.
10 dB gain between 100 watt out or 10 watt efficiency output from the antenna without reference is unnoticeable for some.
Well, let's see...Quote:
Originally Posted by KJ3N
Ignoring the non-technical issues with the post (such as the OP's inability to properly use contractions)...
The HF20A is, essentially, a dipole/inverted V with a balun/matching network of some sort at the feed point. Although you can also rig it up as an OCF dipole, or even as a delta loop.
So what the heck do ground rods have to do with a it, from an RF standpoint?
(As already noted, too, having a 1:1 SWR without a tuner only means that the antenna is presenting a 50 ohm load to the transmitter. Doesn't mean it's radiating a signal. I can find cheaper dummy loads at Mendelson's tent at Dayton.)
I knew I should have read this thread three months ago...Quote:
Originally Posted by n2ize
Way, way, way back when I was in school and one of the ops at K3CR for the WPA section traffic nets... one night, Walt N3WS checked into the WPAPTN net with an extremely weak signal. Usually he was booming in (6:15 PM EST on 75 meters), since he was only about 2 miles from the club shack. We could hear him, but the NCS that night couldn't. So I called him on the 2 meter repeater to see if he was having a problem.
He was.
He'd tuned up the radio and forgotten to take it off the dummy load before checking into the net.
And the dummy load he was using that night, or so he said? A 100 W light bulb.
http://hk2.image4.pushauction.com/35...846fec3f7f.jpg
Balun on the left, Gold Standard SWR device on the right.
:doh: