Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+alternative\s+feedpoint\s+capacitor\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Topband\:\s+alternative\s+feedpoint\s+capacitor\s*$/: 6 ]

Total 6 documents matching your query.

1. Topband: alternative feedpoint capacitor (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sun, 2 Aug 2015 18:10:57 -0600; My top-loaded vertical needs a series 260pF capacitor at the feedpoint to match the 53 + j335 impedance (1.825 MHz) to my coax feed. I have a few different air-variables I could use, but I was wonder; /archives//html/Topband/2015-08/msg00002.html (7,383 bytes)
2. Re: Topband: alternative feedpoint capacitor (score: 1): Author: HAROLD SMITH JR <w0rihps@sbcglobal.net>; Date: Mon, 3 Aug 2015 01:46:32 +0000 (UTC); Hi Steve, I am shunt feeding my 80 ft tower with a stack on top. I first tried air variables and the loading changed with power. I went to vacuum variables and all is well. 500pf @ 7.5kV. 73 Price W; /archives//html/Topband/2015-08/msg00004.html (8,064 bytes)
3. Re: Topband: alternative feedpoint capacitor (score: 1): Author: <n0tt1@juno.com>; Date: Mon, 3 Aug 2015 03:49:13 +0000; I know someone who uses aluminum plates with HDPE plastic to make a fixed capacitor. Works great with 1.5kw on Topband. Formulas to get the cap in reasonably close is in most ARRL RA handbooks. Tweek; /archives//html/Topband/2015-08/msg00005.html (8,012 bytes)
4. Re: Topband: alternative feedpoint capacitor (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 6 Aug 2015 17:26:38 -0400; My top-loaded vertical needs a series 260pF capacitor at the feedpoint to match the 53 + j335 impedance (1.825 MHz) to my coax feed. I have a few different air-variables I could use, but I was wonder; /archives//html/Topband/2015-08/msg00017.html (9,037 bytes)
5. Re: Topband: alternative feedpoint capacitor (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Thu, 6 Aug 2015 18:44:51 -0600; Thanks for the cap suggestions everyone, and for the V and I calculations Tom. Ideally I'd like the 300pF (or so) vac. variable and so will watch for a decent deal on one. In the meantime, I will par; /archives//html/Topband/2015-08/msg00019.html (7,830 bytes)
6. Re: Topband: alternative feedpoint capacitor (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Fri, 7 Aug 2015 16:05:09 -0500; You probably have a current fed vertical so you don't have to worry very much about the voltage on the cap. Any air variable with around 1/4 inch spacing will be fine. It should not be hard to find s; /archives//html/Topband/2015-08/msg00029.html (8,184 bytes)

Current List: 1 - 6
Page: [1]