http://www.barrettcommunications.com...nantennas.html
i have some old antenna books could not find any information on it
it's the 912 model i'm asking about
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http://www.barrettcommunications.com...nantennas.html
i have some old antenna books could not find any information on it
it's the 912 model i'm asking about
Just looks like a pretty standard dipole to me. You could build one yourself for $20-30, most of that going into the balun.
That's a T2FD:
http://www.hard-core-dx.com/nordicdx.../t2design.html
Broadband, to be sure....but you're not going to be able to run high power unless you source a high-wattage, non-inductive resistor for the thing.
The above being said, a T2FD makes a great low-noise receiving antenna - but it'll be down an S-unit or so in received signal strength as compared to a dipole of the same dimensions. A lot of DXers use them.
The Barrett 912 in the 3 wire terminated configuration is a double first cousin to the cage dipole.
These were sometimes referred to as a "clothesline antenna" years ago, also closely related to the "T2FD".
A bit awkward to build from scratch (not as bad as the cage dipole) but broad banded nun the less.
Would not be my recommendation for a part of the country where snow & ice are common unless built out of very heavy gauge materials.
Used to be seen commonly at the large commercial stations in the 30's & 40's .
The minute I see power limitations in the specs, I say "no thanks". I have no desire to waste my power heating up a resistor pack.
thanks i didn't see anything about a resister in the advertising
if so that just makes it the piece of crap that icom sells for a broadband antenna
too bad , i have access to ss cable i thought it would make an interesting project to build
You won't. It's implied by the simple fact that the claims are 2-30Mhz @ 50 ohms, fed with coax. That's simply not possible without a "matching network" at the feed-point, based on what the 912 looks like. The only thing (IMO) that could present that impedance over that wide a range of frequencies is a resistor. The second hint is the different models with different power ratings. Larger resistors for better heat dissipation at the higher power levels.Quote:
Originally Posted by VE7MGF
Icom, Yaesu, B&W, and several others.Quote:
if so that just makes it the piece of crap that icom sells for a broadband antenna
A simple 135 foot dipole, fed with ladder line directly to a tuner, is a perfectly fine "broadband" antenna and will be more efficient than the 912 overall.Quote:
too bad , i have access to ss cable i thought it would make an interesting project to build
i know the length of 135 ft dipole would put it outside my property line
i just have to go with a folded dipole with about one foot spreaders
i am still trying to find 14g ladder line around here
How much room do have?Quote:
Originally Posted by VE7MGF
Why? I run a KW into 18g ladder line.Quote:
i am still trying to find 14g ladder line around here
You can "get away with" about 90' or so with that balanced line doublet.