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Subject:	Re: [geda-user] [OT] Wireless communication 101
From:	"Chris Smith (space DOT dandy AT icloud DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
In-reply-to:	<56025516.3050403@ecosensory.com>
Date:	Wed, 23 Sep 2015 15:56:42 +0100
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References:	<70C4A238-D361-4A6C-A81D-CBF019CADC4F AT icloud DOT com>
	<5601AE56 DOT 2050706 AT neurotica DOT com>
	<0958473E-0115-4C08-860F-EF92B84B7404 AT icloud DOT com>
	<56025516 DOT 3050403 AT ecosensory DOT com>
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> On 23 Sep 2015, at 08:30, John Griessen <john AT ecosensory DOT com> wrote:
> 
> On 09/23/2015 01:50 AM, Chris Smith (space DOT dandy AT icloud DOT com) [via geda-user AT delorie DOT com] wrote:
>> What I'm looking for are any texts or references that discuss the principle of digital encoding for wireless transmission, which algorithms and strategies are used in what circumstances and why. As I said, I can't influence the RF part, only the ones and zeros that are encoded onto the carrier. I also can't change at this stage the simplex operation.
> 
> I don't have a reference, but I've heard that reed solomon encoding has been used by nasa for telemetry
> to get signals through under the noise.

Thanks, I’ll look at that.

> 1/4 wave antennas have to be "just the right length" or else.  5/8 wave antennas have some
> ability to resonate well even with imperfect tuning.  Just rumors though -- not experienced.


I’m using antennas that are correct for the frequency.  I have both 1/4 wave whip antenna and a ‘puck’ antenna — I have no idea what the practical difference is between the two.

Chris
—
Chris Smith <space DOT dandy AT icloud DOT com>

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