HAMSTIK DIPOLE
 

Has anyone used these mobile antennas in the dipole mode? How about a
design for a multiband array on a small rotor?

TNX

--
Russell Jankowski


A.M. SERVICE
440-333-4923

Russ J. wrote:
Has anyone used these mobile antennas in the dipole mode? How about a
design for a multiband array on a small rotor?

Hamstick dipoles work pretty well for 20m-10m. Not well for 40m
and terrible for 75m (unless the application is a special one
like the portable NVIS application in the latest QST).
--
73, Cecil http://www.qsl.net/w5dxp


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Can one use open ladderline with a 20 mtr hamstick & the appropriate
tuner & work 20-10 mtrs.?
"Cecil Moore" wrote in message
...
Russ J. wrote:
Has anyone used these mobile antennas in the dipole mode? How about a
design for a multiband array on a small rotor?

Hamstick dipoles work pretty well for 20m-10m. Not well for 40m
and terrible for 75m (unless the application is a special one
like the portable NVIS application in the latest QST).
--
73, Cecil http://www.qsl.net/w5dxp


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Bandwidth is very, very limited...

On Thu, 30 Dec 2004 16:15:01 GMT, "Russ J."
wrote:

Has anyone used these mobile antennas in the dipole mode? How about a
design for a multiband array on a small rotor?


Last fall we used a pair of 40M Hamsticks up about 30 ft for a demo at
a local school and we made contacts from our location near Atlanta, GA
to stations as far north as Cape Cod and as far south as Florida. We
operated strictly 40 and we ran 100 watts.

73, and Happy New Year,



Bill Cherepy
Grayson, GA

Radio Man wrote:
Can one use open ladderline with a 20 mtr hamstick & the appropriate
tuner & work 20-10 mtrs.?

The problem with using hamsticks on higher frequencies is the loss in
the coil. The 20m hamstick has too much inductance for any higher
frequency and thus has more loss. Losses are probably worst case at the
self-resonant frequency but I don't know what that frequency is for a
20m hamstick and I don't have a 20m hamstick to test. Perhaps someone
with a 20m hamstick and an MFJ-259 will run that test and report the
results. In general, though, it is not a good idea to use hamsticks on
higher frequencies than their resonant frequencies.

However, using parallel 18 MHz hamsticks with ladder-line to cover 20m,
17m, and 15m is probably not a terrible idea.
--
73, Cecil http://www.qsl.net/w5dxp

Are the radiation resistances for various Hamstiks published
anywhere?

TIA.

Chuck

On Fri, 31 Dec 2004 10:34:22 GMT, "Radio Man"
wrote:

Can one use open ladderline with a 20 mtr hamstick & the appropriate
tuner & work 20-10 mtrs.?

Lakeview sells a dipole mount for use with its Hamsticks. It would
seem you could put the thing up, attach your coax feedline, and then
just change out Hamsticks for the appropos bands.

Bob
k5qwg


"Cecil Moore" wrote in message
...
Russ J. wrote:
Has anyone used these mobile antennas in the dipole mode? How about a
design for a multiband array on a small rotor?

Hamstick dipoles work pretty well for 20m-10m. Not well for 40m
and terrible for 75m (unless the application is a special one
like the portable NVIS application in the latest QST).
--
73, Cecil http://www.qsl.net/w5dxp


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Radio Man wrote:

Can one use open ladderline with a 20 mtr hamstick & the appropriate
tuner & work 20-10 mtrs.?

Sure. Don't know if it would be worth the effort, but it's
certainly possible. You're basically trading 'coax' problems
for 'ladderline' problems, there's a differnece in the mechanics.
No idea if the benifits would be worth the effort...
'Doc

Chuck asks:
Are the radiation resistances for various Hamstiks published
anywhere?

Since the Hamsticks are approximately 8 feet long, these values from
the ARRL Antenna Book should be in the same ballpark. 75m ~ 0.8 ohms,
40m ~ 3.0 ohms, 30m ~ 5.8 ohms, 20m ~ 11.0 ohms, 17m ~19 ohms, 12m ~ 29
ohms.
--
73, Cecil http://www.qsl.net/w5dxp