K3 and phase noise
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WA6HHQ:
Rig 1kHz 2 10 20 50 100 1M K3 -110 -119 -136 -140 -143 -144 -150 I'm now wondering how you measured 143 dBBDR at 2 kHz in the presence of 119 dB Phase Noise? Shouldn't the measurement have been "phase noise limited"? 73, Bill W4ZV May quote from this reflector: N6KR: "But just to give you a hint: a couple of days ago Eric measured a blocking dynamic range of 143 dB, and it remained 143 dB at 20 kHz, 5 kHz, and 2 kHz. To put this into perspective, the K2, IC-7800, Orion II, and FTDX9000all have a blocking dynamic range of -133 to -135." _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Hi Bill,
The reference on-channel signal for past ARRL BDR testing has typically been set between -110 and -80 dBm, well above the MDS. te interfering signal generator is increased until this signal drops by a dB due to compression. This on frequency signal dominates the in-band RMS audio voltage. The noise floor needs to raise a lot before it dominates that signal. Also, even on the Orion, their BDR is well above their phase noise at any spacing. For the Orion II, the ARRL numbers are: 2kHz 20kHz Phase Noise -129 -125 BDR 136 136 Neither of their BDRs were noise limited. For the particular K3 I tested the phase noise on below, I measured a typical BDR of 140-141dB at spacings 5 kHz and wider and about 138dB at 2 kHz. On another note, as I mentioned in my email, the ARRL has refined a number of their test methods. They are now making the dynamic range measurements by measuring the on frequency IMD spur or blocked signal using a narrow band spectrum analyzer. This separates the blocking or IMD measurement from reciprocal mixing, which they will do as an additional test. See page 71 of the May 2006 QST for details. 73, Eric WA6HHQ ----- Bill Tippett wrote: > WA6HHQ: > > Rig 1kHz 2 10 20 50 100 1M > K3 -110 -119 -136 -140 -143 -144 -150 > > I'm now wondering how you measured 143 dB BDR at 2 kHz in the > presence of 119 dB Phase > Noise? Shouldn't the measurement have been > "phase noise limited"? > > 73, Bill W4ZV > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Hi Eric
Do you have any transmitter IMD numbers yet? Craig VK3HE --- "Eric Swartz - WA6HHQ, Elecraft" <[hidden email]> wrote: > Hi Bill, > > The reference on-channel signal for past ARRL BDR > testing has typically > been set between -110 and -80 dBm, well above the > MDS. te interfering > signal generator is increased until this signal > drops by a dB due to > compression. This on frequency signal dominates the > in-band RMS audio > voltage. The noise floor needs to raise a lot before > it dominates that > signal. > > Also, even on the Orion, their BDR is well above > their phase noise at > any spacing. > > For the Orion II, the ARRL numbers are: > > 2kHz 20kHz > Phase Noise -129 -125 > BDR 136 136 > Neither of their BDRs were noise limited. > > For the particular K3 I tested the phase noise on > below, I measured a > typical BDR of 140-141dB at spacings 5 kHz and wider > and about 138dB at > 2 kHz. > > On another note, as I mentioned in my email, the > ARRL has refined a > number of their test methods. They are now making > the dynamic range > measurements by measuring the on frequency IMD spur > or blocked signal > using a narrow band spectrum analyzer. This > separates the blocking or > IMD measurement from reciprocal mixing, which they > will do as an > additional test. See page 71 of the May 2006 QST for > details. > > 73, Eric WA6HHQ > ----- > > Bill Tippett wrote: > > WA6HHQ: > > > > Rig 1kHz 2 10 20 50 100 1M > > K3 -110 -119 -136 -140 -143 -144 -150 > > > > I'm now wondering how you measured 143 dB > BDR at 2 kHz in the > > presence of 119 dB Phase > > Noise? Shouldn't the measurement have been > > "phase noise limited"? > > > > 73, Bill W4ZV > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ____________________________________________________________________________________ Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545433 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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