jim, there are two wires, one of each side, that are 131 feet long. they meet in the middle at the support and continue down 175 ish feet into the shack to a 1:1 current balun. I use 'Snaplock' space
aren't they also called 'center feed zepp' antennas? Mike, WB8VGE SunLight Energy Systems The Heathkit Shop http://www.theheathkitshop.com/ J e e p o|||||||o A man with one clock knows what time it i
well poop.... I'm laying in bed playing this all out in my head. I sure want to use this antenna for the 160 meter contest coming up mike Mike, WB8VGE SunLight Energy Systems The Heathkit Shop http:/
that experiment will have to wait until I can get down to the shack.. mike Mike Bryce, WB8VGE the heathkit shop SunLight energy systems J e e p o|||||||o _____________________________________________
The feedpoint impedance of this antenna is close to 50 ohms on 160M. Feeding it with high impedance open wire line is an unnatural act! It's no surprise that you can't match it. Replace that open wir
I'll give it a try when i am back on my feet. Looks like a zipper down the front me. I wonder why the thing works so good on the other bands. tunes right up. I am going to order the 470 pf doorknobs
The antenna at 50 ft and its present length will look more like 20 to 25 ohms on 160M The "600" ohm feed should work OK. The length of the line appears to be a large part of the issue. Change the lin
If C is at max this clearly indicates the need for external capacitity. This can be connected to the terminals on the rear. Typically 1000 pf should be adequate. I find that necessary on my installat
Good choices. I'm still saying that an adjustment in feed line length is necessary. Add some 10 ft and see what improves. Also try the internal balun. You might find it works OK. 73 Bob, K4TAX bob, s
Very good analysis. 73 Bob, K4TAX Mike, Modeling your doublet with EZNEC+ ver 5.0.59 and making 3 assumptions: 1. The antenna is in a straight line 2. Each end slopes down from 50 ft to 10 ft above t
Bob and the group, If Mike would extend his feed line to 241 feet (as you have been saying), he would have an SWR at the end of the line of about 2.5-3.0. This is a SWR that can be easily matched by
What in the world would I do with all the feedline? That's 60 feet Mike wb8vge Sent from my iPad _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists
You can drape it from a tree, wooden pole, etc. As long as it is not near any metal, it will be fine. Get creative here. Do not wind it on itself and keep it 12 inchs away from itself (i.e. do not le
Thanks Bob. 73, Marsh, KA5M Very good analysis. 73 Bob, K4TAX _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/te
Jim, Your suggestion to add 33 uH in series with each leg of the 600-ohm openwire feedline for 160M operation should do the job. Mike, I'd be interested to know how you end up resolving this. Wishing
I still prefer the feedline extension over coils. About 10 years ago there was a short article in QST (or perhaps CQ Magazine) which showed how one guy solved this problem. He built himself the skele