Wayne........That's interesting.....Can you elaborate on that 2 meter
antenna you had? I wonder if one were to make a longer version would it
have gain & a wider bandwidth?


"Wayne" wrote in message
...

"Helmut Wabnig" hwabnig@ .- --- -. dotat wrote in message
...
On Wed, 04 Feb 2009 16:56:30 -0800, Richard Clark
wrote:

On Wed, 4 Feb 2009 22:15:09 +0000, KE5LDO
wrote:


I built this years ago as a quick antenna for receiving and
transmitting. It is name after Havana Cuba's Arnie Coro, since He came
up with it over 20 years ago.

Did Fidel put Arnie against the wall when he published how to
construct a TRANSMITTING antenna?

He should have if for no other reason than the arbitrary instructions:

1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down.
What significance is 45 feet (or 15 meters)? Is this a magic number?

2. Dress it as center conductor and braid on both ends.
Dress right, or dress left?

3. Solder a 50 OHM resisitor on one end, connecting the center and the
braid.
Wouldn't a 50 Ohm resistor present a SWR of 1.04:1? This isn't about
efficiency, is it?

4. On the other end, solder a piece of coax. with braid to center
conductor, center conductor to braid. On the other end, solder a
PL-259, or whatever your rig accepts.. Then connect it to your
receiver/transmitter.
Shouldn't this be 4(a) and 4(b)?

For 4(a) What happened to the resistor?

For 4(b) Why the connector? Just run the existing line out to 4(a)

5. You now have a balanced, low noise antenna. I would suggest a 10
watt or hgher resistor for the amount of power you are going to use if
transmitting.

Why would you use a resistor for receiving? If it were for
transmitting, I can see why Cuba is still under domination by the
Castros.

Something must have been lost in translation - or maybe the process of
getting through the communist censors. Perhaps this was the CIA
antenna design for the Bay of Pigs.

73's
Richard Clark, KB7QHC


no no,
that is the perfect example of a dummy load with a radiating cable.

w.
-
At one time, I lived in an apartment and used a similar, shorter antenna
for 2 meter operation via a repeater. It was easy to build, and worked
fine because I didn't need much signal to hit the repeater.
--Wayne

"Spin" wrote in message
...
Wayne........That's interesting.....Can you elaborate on that 2 meter
antenna you had? I wonder if one were to make a longer version would it
have gain & a wider bandwidth?


Sure. However, I'm not recommending it for anything. As I recall it was a
quarter wave of coax terminated in a 10 watt dummy load. The quarter wave
was connected as previously described, with the shield of the quarter wave
connected to the center conductor of the feedline and the shield of the
feedline connected to the center conductor of tthe quarter wave. I was just
trying to get a dummy load to radiate enough for a short path to a repeater.
(Transmitter ran 10 watts)

At a different time, I simply terminated a feedline (low quality RShack
RG-58) with a 10 watt carbon resistor (unshielded and 3 inch leads). It
worked about the same.

However, remember that I was only trying to hit a single repeater, and a
whip antenna with just a few milliwatts would have worked on that particular
path. The "antenna" was very poor, but there may be paths where it is an
acceptable compromise.

Spin wrote:
Wayne........That's interesting.....Can you elaborate on that 2 meter
antenna you had? I wonder if one were to make a longer version would it
have gain & a wider bandwidth?

Just remember the general rule for antennas: small - efficient -
broadband: pick any two.

Roy Lewallen, W7EL

On Thu, 5 Feb 2009 08:05:40 -0800, "Wayne"
wrote:

At one time, I lived in an apartment and used a similar, shorter antenna for
2 meter operation via a repeater. It was easy to build, and worked fine
because I didn't need much signal to hit the repeater.

Hi Wayne,

In my basement shack, using a 300mW 2M Alinco HT, I can hit my buddy's
repeater 10 miles away. The HT's antenna, fully extended, is only an
8 inch whip.

It doesn't need a resistor. It doesn't need fancy cable preparation.
It is roughly one-hundredth the size of Arnie's, operating at
one-twentieth the wavelength as Arnie's(?).

So, the amended Arnie's minimalist design:
1. Take a 45 ft/15 meter 52 ohm Coax;
2. connect center conductor and braid together on both ends;
3. throw a 50 OHM resistor over your right shoulder for luck;
4. then connect that coax through a tuner to your transceiver;
5. listen and talk to the world.

This pretty much describes my antenna that I could use to listen to
Radio Habana Cuba (and more) when I was a kid. However, I was driven
by economic necessity to be more minimalist. For instance:
1. Take a 45 ft/15 meter surplus armored 1" multi conductor cable;
2. strip out the wire from inside the cable for other projects;
3. keep the 50 OHM resistor for other projects;
4. then connect that cable shell through a tuner to my receiver;
5. listen to the world.

Using the armored shell was an extravagence, as I could have had used
one of the wires that formerly ran through it. That antenna heard
Habana, Quito, Sydney, and Cape Town (or Jo'burg) quite easily.

My radios back then were a Knight Kit Star Roamer, a BC348, a BC453,
and a RBB-1. I used the BC348 as a highly selective, second IF
(85kHz) conversion to the other sets.

73's
Richard Clark, KB7QHC

Richard Clark wrote:

...
In my basement shack, using a 300mW 2M Alinco HT, I can hit my buddy's
repeater 10 miles away. The HT's antenna, fully extended, is only an
8 inch whip.
...
73's
Richard Clark, KB7QHC

Don't be shy, or try to be modest ... it is guys like you that made
first contact with the aliens!

Modesty will get you no where ... sly smile

Regards,
JS

Richard Clark wrote:

Dress right, or dress left?


Took some balls to ask that question... ;^)


- 73 de Mike N3LI -

Michael Coslo wrote:
Richard Clark wrote:

Dress right, or dress left?


Took some balls to ask that question... ;^)


- 73 de Mike N3LI -

WOW! I thought only males had those!

Thanks, you learn something new everyday ... ;-)

Regards,
JS

KE5LDO wrote:
I built this years ago as a quick antenna for receiving and
transmitting. It is name after Havana Cuba's Arnie Coro, since He came
up with it over 20 years ago.
...

Frankly, I have wondered about this. If I hooked an antenna up to my
dummy load, how far could I transmit? What kind of kilowatt signals
would be able to move my meter needle?

Or, was that only a dream? grin

Regards,
JS