On 5/26/2021 1:31 AM, Conrad PA5Y wrote:
As Bob AH7I pointed out at 1KW out the sidebands are 10mW, so I will continue
to use the amp
Conrad,
As an engineer, I LOVE your proper sense of perspective. Here in the
former colonies, I often see splatter 0n 40M, most of it produced by
Yeasu rigs, that extends 2-3 kHz on both sides of the intentional
bandwidth, and only 20 dB down. That's 10W from a 1kW transmitter, and
the signal is 3 times wider than a clean SSB signal.
Any ham who transmits SSB with one of these atrocities is violating the
FCC regs on bandwidth that specify (and I'm paraphrasing here) that
occupied bandwidth shall be no greater than that required for the means
of transmission. In other words, if you're splatting wider than an
un-distorted SSB signal, you are in violation.
For years, I've had the P3 spectrum display with SVGA option hooked up
to my Elecraft K3, and I occasionally watch roundtable SSB QSOs.
Typically one or two stations will be textbook clean, while others will
have that splatter than I've described. And it's not subtle -- the
difference jumps out at you. Obviously the same problems can be caused
by poor or poorly operated power amps, but IMO, they're getting blamed
for a lot of problems caused by these lousy rigs!
73, Jim K9YC
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