JN wrote:
Hamsticks and their clones are for US 75m (4MHz) and not directly tunable to
80m (3,5 MHz)

I plan a Hamstick dipole for Digimodes and CW for say 3560 kHz.

What is the best way to lower the resonance frequency
Some type of capasitive loading at the end of base(coil) section
or an inductance at center wich could maybe also function as impedance
transformer?
What is the feedpoint resistance of Hamstick dipole?

Any ideas or experiences?

A hamstick has measured 12 dB down from a screwdriver
during 75m mobile CA antenna shootouts. That screwdriver
was about 10 dB down from a 1/2WL dipole. A 75m hamstick
is little better than a dummy load having a radiation
resistance of maybe 0.5 ohm and an efficiency in the
ballpark of 1%, i.e. 100 watts in, 1 watt out.

That said, the best way to accomplish what you are trying
to do is to use extenders on the bottom sections. The
longer the section underneath the coil, the greater the
radiation efficiency. I have extenders in 1, 2, 3, 4, 5,
and 6 foot lengths. They really come in handy for antenna
experiments.

If you could use 6 foot base extenders, that would make
the dipole 8+6+6+8 = ~28 feet long overall. Assuming you
could get that antenna up at a decent height (50+ feet),
I think the performance might be "not bad".
--
73, Cecil http://www.w5dxp.com

If you could use 6 foot base extenders, that would make
the dipole 8+6+6+8 = ~28 feet long overall. Assuming you
could get that antenna up at a decent height (50+ feet),
I think the performance might be "not bad".



Cecil, I would be interested in finding out what you are using for
base extenders..... varying lengths of ? with 3/8"-24 female one end, male
another. You make something, or is something commercially available?


Ed K7AAT

Ed_G wrote:
Cecil, I would be interested in finding out what you are using for
base extenders..... varying lengths of ? with 3/8"-24 female one end, male
another. You make something, or is something commercially available?

Hustler makes various extender sections. I have
2 foot and 5 foot sections from Hustler.

Most of my extender sections are from Henry, the
Texas Bugcatcher guy. They are the "BASE MAST"
sections available in lengths from 1/2 foot to
5 feet and special lengths can be ordered.

http://www.texasbugcatcher.com/
--
73, Cecil http://www.w5dxp.com

Most of my extender sections are from Henry, the
Texas Bugcatcher guy. They are the "BASE MAST"
sections available in lengths from 1/2 foot to
5 feet and special lengths can be ordered.

http://www.texasbugcatcher.com/


Thanks. Looked it up.... nice selection. I'll be looking into this.

Ed

On Mar 26, 8:16 am, Cecil Moore wrote:


Hustler makes various extender sections. I have
2 foot and 5 foot sections from Hustler.

Most of my extender sections are from Henry, the
Texas Bugcatcher guy. They are the "BASE MAST"
sections available in lengths from 1/2 foot to
5 feet and special lengths can be ordered.


I have a hustler 3 footer I use all the time..
Really cranks the performance up when you are
parked and can use a taller whip.
My normal whip is 11 ft, exactly center loaded,
and the mast makes it 14, with the coil at 8 ft.
I wish I had a 5 foot version. Might have to get
one of those for industrial strength use. :/
Of course, if I had another 5 ft mast, I'd end up
coupling them together and having 8 ft.
There is no such thing as overkill with a
stationary mobile setup. lol
An 8 ft mast would give me a total height of
19 ft, and the coil would be at 13 ft.
That would brown the food on 75/40 m... :-

wrote:
On Mar 26, 8:16 am, Cecil Moore wrote:

Hustler makes various extender sections. I have
2 foot and 5 foot sections from Hustler.

Most of my extender sections are from Henry, the
Texas Bugcatcher guy. They are the "BASE MAST"
sections available in lengths from 1/2 foot to
5 feet and special lengths can be ordered.


I have a hustler 3 footer I use all the time..
Really cranks the performance up when you are
parked and can use a taller whip.
My normal whip is 11 ft, exactly center loaded,
and the mast makes it 14, with the coil at 8 ft.
I wish I had a 5 foot version. Might have to get
one of those for industrial strength use. :/
Of course, if I had another 5 ft mast, I'd end up
coupling them together and having 8 ft.
There is no such thing as overkill with a
stationary mobile setup. lol
An 8 ft mast would give me a total height of
19 ft, and the coil would be at 13 ft.
That would brown the food on 75/40 m... :-


How do you adjust the coil at that height? Of course I find that I
choose and spend most of my time on one band per mobile session, so
maybe it isn't a big problem.

- 73 de Mike N3LI -

On Mar 27, 7:54 am, Michael Coslo wrote:


How do you adjust the coil at that height? Of course I find that I
choose and spend most of my time on one band per mobile session, so
maybe it isn't a big problem.

- 73 de Mike N3LI -

Well, I only have a few taps on the coil, so I don't have to change
all that often. I might have three taps for 80m, a couple for 40m,
one each for the rest of the bands..
I'll tune the antenna in the normal 11 ft mode, using the usual
tap for the freq I'm using, and then I add the 3 ft mast.
I'll stay on the same coil tap, but shorten the stinger a couple
of inches or so.
I'm on 80 or 40 most all the time, so I don't have to change
but maybe twice a day.. 40 all day, and then I'll switch to
75 at night when it gets dark.

wrote:
... I'll switch to 75 at night when it gets dark.

What do you switch to at night when it doesn't
get dark? :-)
--
73, Cecil http://www.w5dxp.com

Michael Coslo wrote:
nm5k wrote:
Cecil Moore wrote:

Hustler makes various extender sections. I have
2 foot and 5 foot sections from Hustler.

Most of my extender sections are from Henry, the
Texas Bugcatcher guy. They are the "BASE MAST"
sections available in lengths from 1/2 foot to
5 feet and special lengths can be ordered.


I have a hustler 3 footer I use all the time..
Really cranks the performance up when you are
parked and can use a taller whip.
My normal whip is 11 ft, exactly center loaded,
and the mast makes it 14, with the coil at 8 ft.
I wish I had a 5 foot version. Might have to get
one of those for industrial strength use. :/
Of course, if I had another 5 ft mast, I'd end up
coupling them together and having 8 ft.
There is no such thing as overkill with a
stationary mobile setup. lol
An 8 ft mast would give me a total height of
19 ft, and the coil would be at 13 ft.
That would brown the food on 75/40 m... :-


How do you adjust the coil at that height? Of course I find that I
choose and spend most of my time on one band per mobile session, so
maybe it isn't a big problem.

- 73 de Mike N3LI -

The Hustler MO-1 and MO-2 masts have a hinge at 15" and 27" above the bottom
end: http://www.new-tronics.com/main/html/mobile__hf.html
They're 54" tall. The MO-3 is also 54" tall but doesn't have the hinge.
The MO-4 is 22" tall (no hinge).
73,
Bryan WA7PRC