Well gang, Its great being able to move again and once more Im in the shack. I did some interesting testing with my doublet. heres a recap 132 feet on each side fed with 180 ish feet of 600 ohm open
I added about 10 feet of wire inside the shack and strung it across the ceiling. Is that coax or window line? What if you add a substantial length of coax...? What if you, instead, add a substantial
Its wire, with spacers to make it 600 ohm impedance. Like window line, minus the windows. I cant really add much more length to the feed side of the antenna, Ive got it spread out across the ceiling
OK - I thought you might be able to use a longer coax patch cable between balun and rig? Happy trails, OM. Glad to hear you are up and about and able to putz around! -- JHR -- I cant really add much
Mike, just for a quick test, insert a 4:1 balun, between the openwire and the 1:1 current balun. Just insert an SO-239 between the 50 Ohm side of the new balun and the antenna side of the 1:1 balun.
Having gone back and reviewed some 30 or so e-mail exchanges on this topic, it is my conclusion that the length of the wire should be OK and the type and length of the feed-line should be OK. Further
I agree with Bob. But, having no technical background I tend to do things the 'ham' way. I'd try a different 1:1 balun. I know they should be the same, but experience the problems you describe with a
goes to an external 1:1 balun feed with three feet of LMR400 to the coupler. It might be interesting to put an analyzer on the coax after the 1:1 balun and see what kind of impedances you are trying
Bob, John, and the gang, I agree. Why the palstar cant match at 1.825 and the Ten Tec 253 can, yet the palstar can easily match the doublet at 10.120 and the 253 cant still remains a mystery to me. I
Rick, Id give that a try but I dont have a 4:1 balun in the shack. Mike Bryce prosolar@sssnet.com _______________________________________________ TenTec mailing list TenTec@contesting.com http://list
The Ten Tec 229 and 238 series tuners have a built-in 4:1 transformer to match open wire line. A "strap" is needed between two terminals on the rear panel, and the antenna will show up on switch posi
I normally use a home brew balanced tuner that I built for my balanced wire antennas. In order the check my sanity on the topic, I switched my 160M antenna, being some 256 ft of #12 wire being center
Jim, ive tried it both ways and it doesnt seem to matter much. Im going to pull out the 238 and try it with the internal balun Mike Bryce prosolar@sssnet.com _________________________________________
A BALUN and an RF Choke are synonymous. They are the exact same thing (except for the connection terminals). People often use different names to distinguish at what point we are using them, but they
Andy, If you have a 4:1 Current Balun, then you can easily re-wire it as a 1:1 current balun. You just swap two connections inside. IN FACT... if you have a big heavy duty switch, you can even make i
Rick, Doesn't that halve the CM impedance? Steve G3TXQ If you have a 4:1 Current Balun, then you can easily re-wire it as a 1:1 current balun. You just swap two connections inside. IN FACT... if you
Mike, The manual Ten Tec tuners have a 4:1 voltage balun in them (misnomer; it's not really a balun because it doesn't reject common mode current). I don't know if the 253 has this or not, but if it
Yes Steve, you are correct. You have two windings (transmission lines) with the 4:1 Guanella. Usually the bifilar windings are about 100 Ohms. Their inputs are in parallel and their outputs are in se
Rick, I was talking about the CM impedance rather than the Differential-Mode impedance. If you switch in parallel with each other the two 1:1 chokes which form the 4:1 Guanella balun, you have a 1:1
Rick - Yup, you're right. I was referring to the beads on coax as the sleeve balun. My point is only that, even if you have not done all the technical evaluations, try stuff. Less talking, more doing