K3 - RTTY FSK-D power
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If I set power to 100 watts on CW the K3 setting and my Array Solutions Powermaster power meter read the same within a watt or two. Leaving the K3 power set at 100 watts on CW and switch to DATA and run MMTTY diddles , the Powermaster is reading 116 watts. Sending RTTY text it bounces between 115 and 105 watts or so.
K3 SN 7536 latest non beta firmware. Powermaster or something in K3 ??? This is not Powermaster II and I have two couplers , both do the same. SN2441 box. Hank K7HP ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hank,
My initial guess is that it is your Powermaster. I have recently built a 4 State QRP QRPometer to use when testing QRP transmitters. It is an accurate meter as long as the waveform is a good sine wave (Good CW signal), but I have also discovered that it does not read correctly if the waveform is other than a clean CW signal (like PSK31 or RTTY). The cause is the detection methods used in the meter. I cannot say that your Powermaster is doing the same thing, but I will venture a guess that it is related. The K3 does a very good job of controlling power at the requested level, no matter what the mode. But then your question is valid - I don't know your particular answer, and I do not have a Powermaster meter to test with. I am only offering my suspicion. 73, Don W3FPR On 7/19/2013 4:45 PM, Pfizenmayer wrote: > If I set power to 100 watts on CW the K3 setting and my Array Solutions Powermaster power meter read the same within a watt or two. Leaving the K3 power set at 100 watts on CW and switch to DATA and run MMTTY diddles , the Powermaster is reading 116 watts. Sending RTTY text it bounces between 115 and 105 watts or so. > > K3 SN 7536 latest non beta firmware. > > Powermaster or something in K3 ??? This is not Powermaster II and I have two couplers , both do the same. SN2441 box. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by HP
Hi Hank and all. It's almost the same as I see it here on the KPA500 PWR diplay. Diddling RTTY FSK signal make the K3 Pout bubbling a bit. When at a steady 80W Pout without of FSK without diddle I add the diddle the KPA500 move very fast around 80W. I couldn't appreciate the real numbers as they move too fast and the KPA500 is also fast changing. The same at 40W at at the 100W Pout level. The same effect is well seen also on some PS instruments. When the K3 is diddling in RTTY the current shows some diddling also. That's almost empirically, but it is. The same effect was seen on the last FW release and also on the one before. 73 de iw1ayd Salvo ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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The K3 power calibration is done at CW (key down) but FSK includes a bit of shaping to reduce key clicks. That adds just a bit of peak to average power difference and would account for a small difference between CW and FSK. I measure just under 1 watt difference at 80 W between CW and FSK conditions - about 0.6 dB. 73, ... Joe, W4TV On 7/21/2013 10:31 AM, iw1ayd - Salvatore Irato wrote: > > Hi Hank and all. > It's almost the same as I see it here on the KPA500 PWR diplay. Diddling > RTTY FSK signal make the K3 Pout bubbling a bit. When at a steady 80W > Pout without of FSK without diddle I add the diddle the KPA500 move very > fast around 80W. I couldn't appreciate the real numbers as they move too > fast and the KPA500 is also fast changing. The same at 40W at at the > 100W Pout level. The same effect is well seen also on some PS > instruments. When the K3 is diddling in RTTY the current shows some > diddling also. > > That's almost empirically, but it is. > > The same effect was seen on the last FW release and also on the one before. > > 73 de iw1ayd Salvo > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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