I've never been much interested in VHF/UHF, but with the current level of solar flux and the summer static I'm thinking of giving it a try using homebrew antennas based upon DK7ZB designs. For 6m I'
I recently did some work on chokes for 6M and posted the result to an email reflector devoted to grid chasers for that band. Two turns of RG8-size coax through a 1-in id. #31 clamp-on is optimum for
Using a T-match eliminates the need for a choke, for the most part. I have T-matches on everything from 2M to 70 CM. Dave, K4TO _______________________________________________ _______________________
I've never been much interested in VHF/UHF, but with the current level of solar flux and the summer static I'm thinking of giving it a try using homebrew antennas based upon DK7ZB designs. For 6m I'
On 6/28/19 3:32 PM, Jim Brown wrote: I recently did some work on chokes for 6M and posted the result to an email reflector devoted to grid chasers for that band. Two turns of RG8-size coax through a
Can you please explain how a T-Match eliminates the need for a choke? Fundamentally a T-Match itself is a balanced network, and unless you purposely unbalance it I don't see how it eliminates unwant
A folded driven element is inherently 200/300 ohms, if you take the Sinclair or Comprod antennas there is a 96 ohm transference within the element when they talk about open dipole (feed point open) o
The DK7ZB designs I plan to use give a 50 ohm impedance at the center of a single split driven element. A small amount of gain is sacrificed to accomplish that. I modeled the designs in EZNEC+ and
Yes, it's a very good material for 6M and 2M. From that table of chokes, click on any part number to see the data sheet. Scroll down to see plots of Zmag for 1, 2, and 3 turns. For practical chokes,
Hi Glenn, As you said, folded driven element is around 200 to 300 Ohm impedance. To transform that to 50 Ohm is not a balun, it is a impedance transformer. You can transform 300 Ohm to 50 Ohm and sti
Back when I was on EME, we didn't have the knowledge or material to use ferrite chokes, but that might be the way to go now. On my one balanced-line fed array, I manufactured a coaxial sleeve balun