[Antennas] Double Bazooka

Wed, 17 Dec 2003 08:28:44 -0500

Merv,

What I did was to "dip" some coax for a half wave at the desired operating
freq. Once I did that, I made the necessary connections at the centre and
added wire for the rest. That way you would not be guessing. I have found
that most cables that come from the Far East are not made to specs. I have
found RG58U varying between .67 and .85% in vf! There are all coax versions
of the Bazooka too.

Easiest would be to check the VF of the coax (any length) you have and then
doing the calculations.

73,
Ron , 4S7RO/6Y5
----- Original Message -----
From: Merv Stump <[email protected]>
To: <[email protected]>
Sent: Wednesday, December 17, 2003 7:58 AM
Subject: [Antennas] Double Bazooka

> Years ago I had up a double bazooka on 160 which I was quite happy with
> and I would like to put up another.  I've found several websites which
> provide the specifications, however, they all simply say to calculate
> the length of the center section by the formula 325/FMhz.  I am assuming
> that this means the center section should be an electrical half-wave and
> that this formula is only valid if you are using coax with a velocity
> factor of .66.  I am also assuming that if you used coax with a
> different velocity factor that the formula would be adjusted
> accordingly, e.g. for coax with a velocity factor of .80, use the
> formula 394/FMhz.
>
>
>
> Does anyone know if this is correct?
>
>
>
> Merv, W2OE
>
>
>
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