From: (Doug Goncz)

I have ordered 16 feet of Belden "Blue Hose" 78 ohm twinaxial cable.

And the impedance of an open dipole in air is about 75 ohms.

Product: 78-OHM TWINAX SOLID COAX CABLE FOIL+BRAID SHIELD 2 CONDUCTOR
20AWG 100FT/REEL NEW BLUE JACKET
Unit Price: $0.40
Quantity: 16
Items Total: $6.40


Order Subtotal: $6.40
Shipping Cost: $10.80
Tax: $0.00
Order Total: $17.20



Yours,
Doug Goncz ( ftp://users.aol.com/DGoncz/incoming )
Student member SAE for one year.
I love: Dona, Jeff, Kim, Mom, Neelix, Tasha, and Teri, alphabetically.
I drive: A double-step Thunderbolt with 657% range.

Gosh, is my face pink.

You all were right when you wrote to use a balun and 75 ohm coax, not
twinax line to run to the input of the radio. The ring connector on
the OEM dipole is a copy-protection throwoff. The true connection is
that one leg is _grounded_ to the sleeve/barrel/chassi, and the other
is connected to the tip terminal. I determined this with a sewing pin
to penetrate the dipole insulation and an ohmmeter.

But Don Foreman is instructing me in how to rewind my 300:75 ohm balun
to 75:75 ohms for the open six element triple drive antenna so my face
isn't red. That is, I am learning something.

Later, in my shop, I will install the balun core to the Wizard board
and go back to the twinax, so that the Wizard can accept a the big
antenna the way it is now, but with the plug in all the way instead of
just part way, or a new flexible open dipole that is a true balanced
dipole and doesn't have one leg grounded. It can be made from a bit of
twinax, or the existing dipole can simply be soldered to a fresh TRS
connector.

Do any of you know a software patch to get lower than 88 MHz on the
Wizard? I'd like to listen to ATC.

Doug

On 8 Sep 2004 17:36:49 -0700, (Doug Goncz) wrote:

You all were right when you wrote to use a balun and 75 ohm coax, not
twinax line to run to the input of the radio.

Hi Doug,

This probably won't make much difference, because it is hardly an
application killer.

Do any of you know a software patch to get lower than 88 MHz on the
Wizard? I'd like to listen to ATC.

Lower than 88MHz? To what? 550KHz AM?

73's
Richard Clark, KB7QHC

Richard Clark wrote in message . ..
Lower than 88MHz? To what? 550KHz AM?

73's
Richard Clark, KB7QHC


Oops. Lower than 88 MHz are TV channels. I forgot that ATC is higher
than 108 MHz. Looked it up in Pocket Ref by Glover.

Doug

On 11 Sep 2004 01:29:03 -0700, (Doug Goncz) wrote:

Oops. Lower than 88 MHz are TV channels. I forgot that ATC is higher
than 108 MHz. Looked it up in Pocket Ref by Glover.

Hi Doug,

By ATC, I thought you were talking about NPR's All Things Considered.
Now I suppose you are talking about Air Traffic Control(?). If so, an
FM receiver is going to have a difficult job with AM transmissions.

73's
Richard Clark, KB7QHC