[CQ-Contest] Rig Comparisons for Transmitter Noise
Jim Brown
k9yc at audiosystemsgroup.com
Wed Sep 10 12:02:15 EDT 2014
On Wed,9/10/2014 5:06 AM, Charles Morrison wrote:
> Jim, I apologize but ask for clarity. In your paper, the CW performance
> data for the FT5000 is pre or post installation of this latest firmware from
> Yaesu which was dated on the 4th of September?
Hi Charlie,
My report is an analysis of ARRL data from their testing and published
reviews. The Yaesu firmware revision is in response to my release of an
early version of my report. You can check the ARRL website for the date
of that review.
Although I'd love to be surprised, I'm not optimistic about how much
difference their new firmware will make, in light of the fact that this
a company that took three product cycles to fix the much worse clicks in
their FT1000-series products (the black curve in Fig 2). Note also that
firmware can only change keying transients -- it cannot change phase
noise, which is a significant part of their sideband trash close to the
carrier. Reducing phase noise would require major redesign of the radio.
73, Jim K9YC
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