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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+New\s+install\s+being\s+put\s+together\s*$/: 5 ]

Total 5 documents matching your query.

1. Topband: New install being put together (score: 1)
Author: Brian Gieryk <ke6iyc@mac.com>
Date: Wed, 18 Mar 2009 08:09:22 -0700
Good morning all! I am in the process of building a "new" 160 station. The object is: 128' base insulated tower (located, I think) 1 kW Bauer 707 TX 7/8" rigid transmission line What I need is guidan
/archives//html/Topband/2009-03/msg00050.html (6,598 bytes)

2. Re: Topband: New install being put together (score: 1)
Author: "George \(K8GG\) & Marijke Guerin" <gmguerin@voyager.net>
Date: Wed, 18 Mar 2009 15:16:58 -0400
K8GG replies: If you are base or series feeding 128 ft of 45G tower, the approximate impedance is 37 ohms over a good radial system. One suggestion: With 75 ohm hard line one can use a 2:1 UnUn to dr
/archives//html/Topband/2009-03/msg00051.html (7,904 bytes)

3. Re: Topband: New install being put together (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 18 Mar 2009 15:10:51 -0700
And depending on how long the line is, quite small losses in RG8 on 160M. 37 ohms is quite close to 50 ohms, there will be at least a few ohms of resistance in the radials, so additional losses due t
/archives//html/Topband/2009-03/msg00052.html (8,385 bytes)

4. Re: Topband: New install being put together (score: 1)
Author: "Mark Beckwith" <n5ot@n5ot.com>
Date: Thu, 19 Mar 2009 06:10:38 -0500
I use a homebuilt T-network in the shack and feed the vertical directly with big CATV hardline. I cannot imagine that the added complexity of remoting the tuner to the tower base would be worth the
/archives//html/Topband/2009-03/msg00056.html (7,518 bytes)

5. Re: Topband: New install being put together (score: 1)
Author: Kenneth Silverman <kenny.k2kw@gmail.com>
Date: Thu, 19 Mar 2009 16:09:42 -0400
When you have a low impedance antenna (in this case ~35 ohms) going to a higher impedance feed line (either 50 or 75 ohms), I would use a hairpin coil across the feed point rather than a tuner at the
/archives//html/Topband/2009-03/msg00060.html (8,295 bytes)

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