On Tue, 30 Aug 2011, Graham wrote:
> Thank's John,
>
> Ahh -3db splitter .. so that makes my 1 Watt Tx , now 500mW
> carrier feed to the Ae !
> which with a good following breeze is round 1 mW erp ... !
>
G
It was already being split with a 3dB splitter (one feed to the grabber RX
and another to the main RX). Now there's a 2nd splitter, so the main RX is
getting -6dB wrt the antenna signal.
This makes little difference, as the system noise figure is still better
than the band noise, so your effective S/N doesn't change, and your
original ERP is really what counts. If you reduce /THAT/ by 6dB I think
I'd notice in poorer S/N or fewer decodes as your signal drops into the
band noise.
I've got ROS working in TX mode now too... will try a QSO later tonight.
Cheers,
John
GM4SLV
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