[Elecraft] P3 for Sale
I have a very nice, basic P3 for sale. Includes cables, copy of namual and a wool/felt cover. $499, shipped and insured. Pleas respond off list to n...@comcast.net mailto:n...@comcast.net . Tnx es 73, Dave N8AG __ 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
Re: [Elecraft] Where to put the wattmeter
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
Re: [Elecraft] Where to put the wattmeter
The classic way [I believe used by the now-ancient Heath monitor scope although I could be mixing up archaeologic relics] was to feed the RF sensor output to the vertical deflection and the audio [from the speech amp ... remember those?] to the horizontal deflection. I've just never found that the time-domain waveform was a very good indicator of signal quality. I can vaguely see a system where the P3 in TX monitor mode would accept a hypothetical "TX audio monitor output" from the K3 to provide the H-deflection ...that might do it ... I think. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County Alan Bloom wrote on 4/19/2023 7:32 PM: There's no reason the P3 can't display it if you have a way to generate the trapezoidal pattern from the transmitter. I think feeding a triangle wave from a function generator into the mic input would do it. Alan N1AL On 4/19/23 16:38, Fred Jensen wrote: and I'd buy one if it would do a trapezoidal pattern. Judging TX signal quality looking at the time-domain envelope is pretty hard, but I can judge straight sides on the T-pattern 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County -- This email has been checked for viruses by AVG antivirus software. www.avg.com __ 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
