- 1. Re: Topband: Wire antennas and antenna analyzers (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Thu, 28 Sep 2006 09:44:05 -0700
- I agree totally. I spent most of my career in discrete semiconductors (including schottky diodes), first as a product engineer and then as a manager at various levels. The metal-to-semiconductor cont
- /archives//html/Topband/2006-09/msg00134.html (9,989 bytes)
- 2. Re: Topband: Measuring field strength (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Fri, 22 Dec 2006 18:23:07 -0700
- It is even quite easy to create models in EZNEC that support Tom on this. The relative base impedance of a vertical monopole fed against ground does not accurately predict relative field strength in
- /archives//html/Topband/2006-12/msg00235.html (9,222 bytes)
- 3. Re: Topband: Modeling verticals (fat, skinny, etc) on EZNEC (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Sat, 23 Dec 2006 20:33:47 -0700
- Sorry, Dave, but unless I misunderstand your point that simply is not true. A tilted dipole has only one polarization (except for end effects) and that polarization is similarly tilted. Any receiving
- /archives//html/Topband/2006-12/msg00264.html (10,432 bytes)
- 4. Re: Topband: Need advice (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Sun, 07 Jan 2007 10:50:28 -0700
- I think perhaps you have it reversed .... i.e., that which is unfounded "tribal knowledge" and that which isn't. Every beverage text I've seen with actual math behind it says they work better with po
- /archives//html/Topband/2007-01/msg00097.html (8,626 bytes)
- 5. Re: Topband: beverage lobes (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Tue, 09 Jan 2007 14:46:04 -0700
- That's quite interesting. Bob Brown, NM7M, once told me that for my location (southern Arizona near the Mexican border) vertical polarization had an 11 (eleven!) db advantage versus horizontal polari
- /archives//html/Topband/2007-01/msg00168.html (9,513 bytes)
- 6. Re: Topband: What do you use as a "Run" antenna? (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Tue, 27 Feb 2007 13:12:14 -0700
- I think if you check back a few weeks you'll find a pretty good explanation from Tom, W8JI, on why that happens. A quick summary is that, in the hour or so just before sunset, your signals headed eas
- /archives//html/Topband/2007-02/msg00288.html (8,869 bytes)
- 7. Re: Topband: Ham Radio in EZ (score: 1)
- Author: David Gilbert <xdavid@cis-broadband.com>
- Date: Wed, 11 Apr 2007 09:47:38 -0700
- I sent off a note as Bill requested, but also was curious enough about Turkmenistan to do a bit of checking on it. I found a very interesting website maintained by the Turkmenistan embassy in Washing
- /archives//html/Topband/2007-04/msg00072.html (7,125 bytes)
This search system is powered by
Namazu