[Antennas] questions

Mon, 10 Mar 2003 21:06:44 +0100

I hadn't tested that setup yet, but I quickly did. Grabbed a piece of
RG-58 lying around and quickly wound a 6 turn 6" dia coil. If I attach
the braid on both ends to my RF Analyst (using 2 inch leads), this is
what I measure:

    F         Z
1.80 Mhz     130 Ohm
3.65 Mhz     293 Ohm
7.15 Mhz    1238 Ohm
14.20 Mhz    761 Ohm
29.00 Mhz    191 Ohm

Between 8.10 Mhz and 10.70 Mhz the Z reads 'H' (High), which means
higher than what the RF Analyst can measure.

Hope this helps...

73
Jaap
PA8DX

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Lefczik, Larry D
Sent: maandag 10 maart 2003 18:46
To: [email protected]
Subject: RE: [Antennas] questions

How did this compare to the 6 turns of coax?  What there the
measurements for that?

ldl- I measured a 10 bead 
ldl- choke with my
ldl- Autek RF Analyst and it shows an impedance of a few 
ldl- hundred to more than
ldl- a thousand ohm, depending on the frequency, so it should 
ldl- work for this
ldl- purpose. And at a fraction of the price of a commercial balun!
ldl- 

ldl- 
ldl- I am getting ready to put up a Cushman A743 I picked up. The
ldl- instructions call for  6 loops of coax 6" in dia at the 
ldl- antenna feed
ldl- point. I have heard it is better to slip some ferrites on the coax.
ldl- Advise? Opinions? Suggestions? Lloyd Godsey  KK7IZ 1315 N. 
ldl- Udall Circle
ldl- Mesa, Az  85203
- - - 

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