[CQ-Contest] Rig Comparisons for Transmitter Noise

David Siddall hhamwv at gmail.com
Sun Sep 7 17:28:03 EDT 2014


Jim,

Good stuff, thanks!

I also recommend K3NA's article on adjusting SSB audio chain.  While
specific to Orion, the principles are adaptable any any rig.

http://www.k3na.org/articles/Transmit%20audio%20adjustment.pdf

73, Dave K3ZJ

On Sun, Sep 7, 2014 at 1:13 PM, Jim Brown <k9yc at audiosystemsgroup.com>
wrote:

> Over the last decade or so, Rob Sherwood's extensive work on receiver
> performance has done much to improve the receivers in modern rigs, but
> transmitters have been sadly neglected.
>
> A month or so ago I began work on a project to compare ARRL test data for
> selected rigs, focusing on the trash they generate. I shared an early
> version of that work on the Elecraft reflector, and it seems to have found
> it's way to Yaesu, who has just put new firmware on their website to
> improve the CW waveform.
>
> I've done a lot of work on the piece since then, and it's near its final
> form. If you're thinking about buying a new rig, it should give lots of
> food for thought.
>
> http://k9yc.com/TXNoise.pdf
>
> Also, if you haven't already done so, see the slides for K6XX's excellent
> presentation on Signal Cleanliness, which, among other things, shows how we
> can set up and operate our existing rigs to produce a cleaner signal.
>
> k9yc.com/K6XXAmpTalk.pdf
>
> 73, Jim K9YC
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