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From:	"drew einhorn (drew DOT einhorn AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Wed, 23 Sep 2015 15:31:36 +0000
Message-ID:	<CAJ1u4k0e=iucg2GU=gnTn9XTN1+sPmKbF-5t3KvvVq-3brt8uw@mail.gmail.com>
Subject:	Re: [geda-user] [OT] Wireless communication 101
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

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I don't know much about this and am not clear on the details.  I suggest
googling "antenna diversity".

Many wireless access points have multiple antennas.  They do not combine
the signals going into the radio.  Instead they periodically switch
antennas, then select the antenna that is performing the best at the
current time.  Not all wireless access points with multiple antennas use
antenna diversity. There are other high bandwidth technologies that use
multiple antennas and multiple radios.

You maybe able to retrofit this with a circuit in front of your radio, with
your processor monitoring the radio output and selecting the appropriate
antenna.


On Wed, Sep 23, 2015 at 9:09 AM Chris Smith (space DOT dandy AT icloud DOT com) [via
geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

>
> > 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=E2=80=99ll 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 thoug=
h
> -- not experienced.
>
>
> I=E2=80=99m using antennas that are correct for the frequency.  I have bo=
th 1/4
> wave whip antenna and a =E2=80=98puck=E2=80=99 antenna =E2=80=94 I have n=
o idea what the practical
> difference is between the two.
>
> Chris
> =E2=80=94
> Chris Smith <space DOT dandy AT icloud DOT com>
>
>
>
>

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<div dir=3D"ltr">I don&#39;t know much about this and am not clear on the d=
etails.=C2=A0 I suggest googling &quot;antenna diversity&quot;. =C2=A0<div>=
<br></div><div>Many wireless access points have multiple antennas.=C2=A0 Th=
ey do not combine the signals going into the radio.=C2=A0 Instead they peri=
odically switch antennas, then select the antenna that is performing the be=
st at the current time.=C2=A0 Not all wireless access points with multiple =
antennas use antenna diversity.=C2=A0There are other high bandwidth technol=
ogies that use multiple antennas and multiple radios.</div><div><br></div><=
div>You maybe able to retrofit this with a circuit in front of your radio, =
with your processor monitoring the radio output and selecting the appropria=
te antenna.</div><div><br></div></div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr">On Wed, Sep 23, 2015 at 9:09 AM Chris Smith (<a href=3D"mailto:s=
pace DOT dandy AT icloud DOT com">space DOT dandy AT icloud DOT com</a>) [via <a href=3D"mailto:g=
eda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] &lt;<a href=3D"mailto:geda=
-user AT delorie DOT com">geda-user AT delorie DOT com</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><br>
&gt; On 23 Sep 2015, at 08:30, John Griessen &lt;<a href=3D"mailto:john AT eco=
sensory.com" target=3D"_blank">john AT ecosensory DOT com</a>&gt; wrote:<br>
&gt;<br>
&gt; On 09/23/2015 01:50 AM, Chris Smith (<a href=3D"mailto:space DOT dandy AT icl=
oud.com" target=3D"_blank">space DOT dandy AT icloud DOT com</a>) [via <a href=3D"mail=
to:geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>] wrot=
e:<br>
&gt;&gt; What I&#39;m looking for are any texts or references that discuss =
the principle of digital encoding for wireless transmission, which algorith=
ms and strategies are used in what circumstances and why. As I said, I can&=
#39;t influence the RF part, only the ones and zeros that are encoded onto =
the carrier. I also can&#39;t change at this stage the simplex operation.<b=
r>
&gt;<br>
&gt; I don&#39;t have a reference, but I&#39;ve heard that reed solomon enc=
oding has been used by nasa for telemetry<br>
&gt; to get signals through under the noise.<br>
<br>
Thanks, I=E2=80=99ll look at that.<br>
<br>
&gt; 1/4 wave antennas have to be &quot;just the right length&quot; or else=
.=C2=A0 5/8 wave antennas have some<br>
&gt; ability to resonate well even with imperfect tuning.=C2=A0 Just rumors=
 though -- not experienced.<br>
<br>
<br>
I=E2=80=99m using antennas that are correct for the frequency.=C2=A0 I have=
 both 1/4 wave whip antenna and a =E2=80=98puck=E2=80=99 antenna =E2=80=94 =
I have no idea what the practical difference is between the two.<br>
<br>
Chris<br>
=E2=80=94<br>
Chris Smith &lt;<a href=3D"mailto:space DOT dandy AT icloud DOT com" target=3D"_blank"=
>space DOT dandy AT icloud DOT com</a>&gt;<br>
<br>
<br>
<br>
</blockquote></div>

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