Bubblesdee wrote:

Thanks for your reply No Spam.

I was wondering if you might be able to clarify some points that you
made.

1) Since I will be feeding the antenna via 300 ohm feedline,
transforming it down to 75 ohms (coax) to eliminate noise and then
transforming it back to 300 ohms, could I not just take one leg of the
output of the transformer and connect it to the External antenna
connector on the back of the radio instead of the whip? and then
connect the other leg from the transformer to the ear jack ground. and
then finally ground the radio via the GROUND connecter on the back of
the set.

2) when you refer to to the ear jack ground, are you referring to the
ground of the headphone jack. Is this the same point as the GROUND
connector on the back of the radio or are the two points different?

Thanks again

My S350DL has unbalanced, 500 ohm antenna terminals on the back; I
would imagine yours to be the same.

A 1:1 balun (balanced-to-unbalanced) at the dipole and coax (75 ohm) and
a 6.666:1 UNUN (unbalaced-to-unbalanced) between the coax and the S350DL
would be the ideal setup.

Regards,
JS


Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!

John Smith wrote:


My S350DL has unbalanced, 500 ohm antenna terminals on the back; I
would imagine yours to be the same.

A 1:1 balun (balanced-to-unbalanced) at the dipole and coax (75 ohm) and
a 6.666:1 UNUN (unbalaced-to-unbalanced) between the coax and the S350DL
would be the ideal setup.

Regards,
JS


Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!

Oh chit, it is folded dipole, duh!

A 1:1 current choke and forget the slight mismatch!

Regards,
JS
Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!

John Smith wrote:
John Smith wrote:


My S350DL has unbalanced, 500 ohm antenna terminals on the back; I
would imagine yours to be the same.

A 1:1 balun (balanced-to-unbalanced) at the dipole and coax (75 ohm)
and a 6.666:1 UNUN (unbalaced-to-unbalanced) between the coax and the
S350DL would be the ideal setup.

Regards,
JS


Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!

Oh chit, it is folded dipole, duh!

A 1:1 current choke and forget the slight mismatch!

Regards,
JS
Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!

Actually, that is in error. Since the folded dipole is balanced and the
500 ohm terminals on the receiver show they are unbalanced, the 1:1
balun should suffice. It seems you will be going from 300 twinlead
(balanced) to the 500 ohm terminals.

450 ohm feedline with a 1:1 balun is yet another option ...

Regards,
JS

Half-a-Brain-McCain'n Insane; So Lawdy Mama, It Looks Like Obama!