Folded dipole?
 

Does anyone still use a folded dipole with an appropriate impedance matching balun today? Not the broadband type that B & W sells, but the old monoband basic folded dipole, that many operators used 50 years ago. ???

-- Cliff, W4ZFL

On Thu, 28 Aug 2003 02:20:37 GMT, "Cliff Gieseke"
wrote:

Does anyone still use a folded dipole with an appropriate impedance matching balun today? Not the broadband type that B & W sells, but the old monoband basic folded dipole, that many operators used 50 years ago. ???

-- Cliff, W4ZFL

Fifty years ago they fed it with open transmission line and a balun
was not needed.

Danny, K6MHE

Cliff,

M2, HyGain, and at least one CushCraft use the 4:1 balun that consists of a
1/2 wave section of coax on some beams. Gets kind of long below 10 meters,
but no reason it wouldn't work with a folded dipole. You would end up with
about 70 Ohms.

Tam/WB2TT
"Cliff Gieseke" wrote in message
.. .
Does anyone still use a folded dipole with an appropriate impedance matching
balun today? Not the broadband type that B & W sells, but the old monoband
basic folded dipole, that many operators used 50 years ago. ???

-- Cliff, W4ZFL

Back then, as a teenager, I had one with 300 ohm twinlead and a short run of
coax between a balun and a Harvey Wells TBS50c. ... A number of old timers
then were, of course, using open line feeders.

Cliff, W4ZFL

Fifty years ago they fed it with open transmission line and a balun
was not needed.

Danny, K6MHE

Cliff Gieseke wrote:
Does anyone still use a folded dipole with an appropriate impedance
matching balun today? Not the broadband type that B & W sells, but the
old monoband basic folded dipole, that many operators used 50 years
ago. ???

Most hams use a 4:1 balun with a folded dipole instead of the more
complicated 6:1 balun. "300 ohm" window line usually has a Z0 less
than 300 ohms. The stuff I have is about 275 ohms.
--
73, Cecil http://www.qsl.net/w5dxp



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Bill wrote:
The old Heathkit dual coil setup is what you are talking about.
They were not single band but could be used with any 300ohm
fed folded dipole on any of the 80 - 10 bands in use at that time.

Used also with an all-HF-band (at the time) off-center fed dipole
(commonly called a Windom today).
--
73, Cecil http://www.qsl.net/w5dxp



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In the ARRL antenna book, in the chapter on portable antennas, there is
an article on a folded dipole using 300 ohm tv twinlead, which is
matched using a capacitor, or a stub of 300 ohm twinlead.

I've had one of these for 80 meters for over two years, and I'm quite
happy with it. I made it with "rat shack" TV twinlead, exactly
according to the cookbook, and it has a 1:1 SWR right at 3775. My rig
has no problem matching across the entire band, and the SWR around 3510
or 3990 is just approaching 3:1.

I chose to use the stub match, because I had the twinlead handy.
Dressing the stub away from the feed line is the biggest drawback I found.

Its mounted as a shallow vee, with the apex at about 50 feet, ends at
about 30 feet.

Just a different method of matching, but its simple and functional.

73,
W4KAZ

I used a folded dipole on 15 and 40 from 1992-2000 when I moved to a much
larger lot.
I used mine with a Johnson Matchbox, so I did not need a 6:1 balun.
Ed, N5EI
"Cliff Gieseke" wrote in message
.. .
Does anyone still use a folded dipole with an appropriate impedance matching
balun today? Not the broadband type that B & W sells, but the old monoband
basic folded dipole, that many operators used 50 years ago. ???

-- Cliff, W4ZFL