AeroElectric-List Digest Archive

Tue 02/28/12


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 05:41 AM - Re: Dipole antenna fabrication (Eric M. Jones)
     2. 11:54 AM - Re: Re: Dipole antenna fabrication (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 05:41:19 AM PST US
    Subject: Re: Dipole antenna fabrication
    From: "Eric M. Jones" <emjones@charter.net>
    > Bob N. said: But you paint a picture suggesting that a balun would make the difference between communicating with some distant > station . . . and not. No, I didn't. Not at all. But I've flown across western stretches (Try Bishop to Death Valley, pardner...). No Radar, no flight following, no radio communication of any kind. I've also flown all over Mexico, where radio relay from plane-to-plane-station is how it's done. In Baja, communications with the mainland is typical...and very hard...but HEY, it's line of sight! I am glad to see others post good info. There are many Hams out there who are quite skilled in this area. Thanks Jan de Jong. I'll be building one of those for my Glastar's vertical stab. If local ops and $100 hamburgers is all you do, Bob N. is right. If you want better performance for little extra effort, then I'm right. -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=367431#367431


    Message 2


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    Time: 11:54:41 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Dipole antenna fabrication
    At 07:39 AM 2/28/2012, you wrote: > Bob N. said: But you paint a picture suggesting that a balun would make the difference between communicating with some distant station . . . and not. No, I didn't. Not at all. . . . I'm confused . . . But I've flown across western stretches (Try Bishop to Death Valley, pardner...). No Radar, no flight following, no radio communication of any kind. I've also flown all over Mexico, where radio relay from plane-to-plane-station is how it's done. In Baja, communications with the mainland is typical...and very hard...but HEY, it's line of sight! Okay, we're talking about fringe communications . . . I am glad to see others post good info. There are many Hams out there who are quite skilled in this area. Thanks Jan de Jong. I'll be building one of those for my Glastar's vertical stab. If local ops and $100 hamburgers is all you do, Bob N. is right. If you want better performance for little extra effort, then I'm right. I didn't know it was a right/wrong contest but an quantitative evaluation of return on investment. Did you agree that adding a balun is unlikely to produce any observable effect . . . yet hamburger runs makes Bob 'right' and 'extra performance' makes him wrong . . . ????? Just for grins I went to the bench and set up a receiver for 130MHz and turned on the HP generator set for 30% AM modulation. I opened the squelch and turned the radiated signal up until I could just barely tell that there was a modulated signal competing with the receiver's noise floor at (0.10 uV); a reasonable simulation of 'extreme fringe' communications. I turned the signal up until I was reasonably certain that I could deduce spoken words on a still very noisy signal. It took 0.2 to 0.33 uV (6 to 20 dB increase) to make that much difference. Were I trying to carry on meaningful conversation with cockpit ambients added in . . . maybe that wouldn't have been enough. If one compares balun vs. no-balun characteristics, what factor of 'better performance' would you expect? Bob . . .




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