My eyes were recently opened in reviewing several Rob Sherwood NC0B presentations regarding the receiver testing he is famous for…. as the presentations really focused on transmitter cleanliness. In the presentations, Rob argues we have many excellent receivers available to us today - and goes on to argue today’s transmitters are the problem loading the bands with splatter, phase noise, key clicks and other undesirable artifacts, with Elecraft among the cleanest (and several other popular radios among the dirtiest).
Look up Rob on YouTube for several excellent presentations. Steve AA8AF > On Apr 20, 2023, at 2:20 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > > On 4/20/2023 11:05 AM, Fred Jensen wrote: >> I've just never found that the time-domain waveform was a very good >> indicator of signal quality. > > RIGHT! > > By far, the most sensitive (and the most meaningful) measure of transmit > distortion is occupied bandwidth, as measured on a spectrum display with > narrow resolution bandwidth and narrow display bandwidth, and that can > display and hold signal peaks. The P3 is quite good for this, and even better > with the SVGA module. For voice modes, the waterfall can be adjusted to > display splatter as horizontal expansion of the signal on voice peaks. > > Elecraft rigs look great on such a display, straight vertical bars; > overdriven power amps and many recent model Yaesu rigs produce splatter about > 2.5 kHz both sides of their signal (those vertical bars), only 20 dB down > from PEP. That is, 2.5 kHz on both the suppressed carrier side, and 5.5 kHz > on the other side of the suppressed carrier. > > 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
