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Message-ID: <56040B5C.1020406@ecosensory.com>
Date: Thu, 24 Sep 2015 09:40:28 -0500
From: John Griessen <john AT ecosensory DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] [OT] Wireless communication 101
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Reply-To: geda-user AT delorie DOT com

On 09/24/2015 01:36 AM, Chris Smith (space DOT dandy AT icloud DOT com) [via geda-user AT delorie DOT com] wrote:
> Yes, I'm already Manchester encoding the data and transmitting a significant amount of 0xAA preamble for the RX to lock on to.
>
> Chris

So, you have some control of what's sent.  How about the antenna tuning?  Did your antennas come with
your modules, or are they coax connected generic?

Can you set one to receive and observe its RSSI numbers?  If so, you could set up
a test range and send with a 1/4 wave antenna and cut or grind off some length and repeat
and chart the results.  If there's no maximum, you might need to add length, else choose the length
that gives a max.

The antenna by itself has assumptions built in about your TX.  Testing with antenna and TX together
takes all assuming and is a definitive answer.

The TX and RX frequencies need to be well under control too, or no results.