[OpenTRV-dev] TX failure with second board

[Mike Stirling]

----------------original message-----------------
From: "Damon Hart-Davis" EMAIL ADDRESS HIDDEN 
To: "Mike Stirling" EMAIL ADDRESS HIDDEN 
CC: "Damon Hart-Davis" EMAIL ADDRESS HIDDEN , "Closed list for developer discussions" EMAIL ADDRESS HIDDEN 
Date: Mon, 18 Mar 2013 10:08:57 +0000
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> Hi Mike (and list),
> 
> The transmission problems that I was having with the second soldered-up board 
> appear to be, given this morning's (and unintended overnight!) experiments, a 
> mixture of timing jitter and antenna issues.
> 
> What is the likely ERP loss from my crappy 75mm antenna, running parallel to the 
> board edge and in its plane, compared to an 87mm perpendicular? Hand-waving 
> estimate is all that I'm after, eg 3dB/x2.

Shrug; it's a black art remember! Is there some separation between the board and the antenna's parallel run, or are they directly adjacent. If the latter then that would probably reduce ERP drastically. Is it in an enclosure? Black plastic is often quite opaque to RF due it often being coloured with carbon.


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