[Antennas] Mosley Classic 33 Balun?

Sat Dec 11 15:58:39 EST 2004

What you get with coiled coax is a common mode choke (used as a
balun).....so no radiation occurs on the shield...
Best to wind it 5-10 times about the size of a oatmeal tube or similar
size...Merely tape or tie wrap it in place
And you'll be find. Without a 1:1 balun, it would be best to use the
coax choke..keeps the pattern in place (prevents skewing of the radiated
pattern due to radiation from the shield)
Chris
WB5ITT
> -----Original Message-----
> From: antennas-bounces at mailman.qth.net 
> [mailto:antennas-bounces at mailman.qth.net] On Behalf Of Don Boyer
> Sent: Saturday, December 11, 2004 1:27 PM
> To: antennas at mailman.qth.net
> Subject: [Antennas] Mosley Classic 33 Balun?
>>> I recently obtained a Mosley Classic 33 antenna that appears 
> to be in excellent shape. It has an SO-239 coax connector to 
> the antenna's "Classic Match". The Mosley website indicates 
> that for The Classic System: "To isolate the outer coax 
> conductor from ground, the coax line is coiled for a few 
> turns near the antenna end. This is designed to prevent the 
> very unlikely effect of Feed Line Radiation". I have also 
> heard that with the Classic 33, you can connect your coax 
> directly to the SO-239.
>> Is this coiled coax actually needed and if so, how many 
> turns, what diameter is the coil and where is the coil 
> located? (I typically use RG-8 coax) Any comments regarding 
> this interface would be greatly appreciated. The coiled coax 
> may not even be required. This is unclear to me.
>> Also, any repair / maintenance pointers would be helpful 
> before I put the antenna on my tower. Thank you.
>> Don - WB0AIN