P3 - Displaying my signal
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A new feature seems to have appeared with my K3/P3 combo, both factory
assembled. Whenever I key the K3 on an empty daytime 80 meter band, I get a narrow, but strong waveform down about 300-400 Hz from the marked carrier frequency. If I hold key down for a few seconds the spike builds to about -80dBm from a noise base of about -130dBm. I searched the archives but all I saw was something about a phantom signal. This is not phantom at all. Of course it also shows brilliantly in the waterfall display. I have checked that all cables and power connected to both units are well attached. Also, this feature appears to be new, have been created overnight by Murphy. All suggestions welcome. Thanks. Gary W2CS ______________________________________________________________ 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 P3 is supposed to freeze when the K3 is transmitting. However, when
the K3 is set for CW semi break in, it unfreezes after the first character. This is a bug not a feature. :=) If you would like to view your transmitted signal for test purposes, you can do it by temporarily disconnecting the RS-232 cable to the K3. That disables the freeze-on-transmit function. What you are viewing is stray IF leakage coming out the K3's IF OUT connector. The signal level is rather low and varies with drive level, frequency band, and the particular K3. However, I do find it useful for adjusting the transmit equalizer. With my K3 set for SSB, I turned on peak hold on the P3 and talked into the mic for a few seconds. The peak value is a fair representation of the transmitted spectrum. I could see that it was way too bassy (low audio frequencies stronger than the highs) which results in a muddy-sounding signal that lacks "punch". It took maybe 5 minutes playing around with the K3 TX equalizer to get a nice flat spectrum. Alan N1AL On Wed, 2010-10-13 at 13:22 -0400, Gary Ferdinand wrote: > A new feature seems to have appeared with my K3/P3 combo, both factory > assembled. Whenever I key the K3 on an empty daytime 80 meter band, I get a > narrow, but strong waveform down about 300-400 Hz from the marked carrier > frequency. If I hold key down for a few seconds the spike builds to about > -80dBm from a noise base of about -130dBm. I searched the archives but > all I saw was something about a phantom signal. This is not phantom at all. > Of course it also shows brilliantly in the waterfall display. > > I have checked that all cables and power connected to both units are well > attached. Also, this feature appears to be new, have been created overnight > by Murphy. All suggestions welcome. Thanks. > > Gary W2CS > > > > ______________________________________________________________ > 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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Alan,
Is there a possibility down the road of displaying our signal so we might better see what we are sending?? 73, Don, WB5HAK ______________________________________________________________ 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 Alan Bloom-2
Alan, I'm using QSK not semi break in. Does that matter at all? Interesting usage of it though!
Gary W2CS > -----Original Message----- > From: Alan Bloom [mailto:[hidden email]] > Sent: Wednesday, October 13, 2010 2:04 PM > To: Gary Ferdinand > Cc: Elecraft > Subject: Re: [Elecraft] P3 - Displaying my signal > > The P3 is supposed to freeze when the K3 is transmitting. However, > when > the K3 is set for CW semi break in, it unfreezes after the first > character. This is a bug not a feature. :=) > > If you would like to view your transmitted signal for test purposes, > you > can do it by temporarily disconnecting the RS-232 cable to the K3. > That > disables the freeze-on-transmit function. What you are viewing is > stray > IF leakage coming out the K3's IF OUT connector. The signal level is > rather low and varies with drive level, frequency band, and the > particular K3. > > However, I do find it useful for adjusting the transmit equalizer. > With > my K3 set for SSB, I turned on peak hold on the P3 and talked into the > mic for a few seconds. The peak value is a fair representation of the > transmitted spectrum. I could see that it was way too bassy (low audio > frequencies stronger than the highs) which results in a muddy-sounding > signal that lacks "punch". It took maybe 5 minutes playing around with > the K3 TX equalizer to get a nice flat spectrum. > > Alan N1AL > > > On Wed, 2010-10-13 at 13:22 -0400, Gary Ferdinand wrote: > > A new feature seems to have appeared with my K3/P3 combo, both > factory > > assembled. Whenever I key the K3 on an empty daytime 80 meter band, > I get a > > narrow, but strong waveform down about 300-400 Hz from the marked > carrier > > frequency. If I hold key down for a few seconds the spike builds to > about > > -80dBm from a noise base of about -130dBm. I searched the archives > but > > all I saw was something about a phantom signal. This is not phantom > at all. > > Of course it also shows brilliantly in the waterfall display. > > > > I have checked that all cables and power connected to both units are > well > > attached. Also, this feature appears to be new, have been created > overnight > > by Murphy. All suggestions welcome. Thanks. > > > > Gary W2CS > > > > > > > > ______________________________________________________________ > > 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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In reply to this post by Don Cunningham
Don,
Oh YES PLEASE.....this has always been number one on my list of P3 features. It would cause me to no longer be called Grumpy...:-) 73"s Gary On Thu, Oct 14, 2010 at 4:36 AM, Don Cunningham <[hidden email]>wrote: > Alan, > Is there a possibility down the road of displaying our signal so we might > better see what we are sending?? > 73, > Don, WB5HAK > > ______________________________________________________________ > 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 > -- Gary VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679 For everything else there's Mastercard!!! ______________________________________________________________ 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 Alan Bloom-2
Allan,
Great idea!!! Thank you! Back to adjusting my audio. I will use the K3 easy which is just super for fast adjustment. Bill K9YEQ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Alan Bloom Sent: Wednesday, October 13, 2010 1:04 PM To: Gary Ferdinand Cc: Elecraft Subject: Re: [Elecraft] P3 - Displaying my signal The P3 is supposed to freeze when the K3 is transmitting. However, when the K3 is set for CW semi break in, it unfreezes after the first character. This is a bug not a feature. :=) If you would like to view your transmitted signal for test purposes, you can do it by temporarily disconnecting the RS-232 cable to the K3. That disables the freeze-on-transmit function. What you are viewing is stray IF leakage coming out the K3's IF OUT connector. The signal level is rather low and varies with drive level, frequency band, and the particular K3. However, I do find it useful for adjusting the transmit equalizer. With my K3 set for SSB, I turned on peak hold on the P3 and talked into the mic for a few seconds. The peak value is a fair representation of the transmitted spectrum. I could see that it was way too bassy (low audio frequencies stronger than the highs) which results in a muddy-sounding signal that lacks "punch". It took maybe 5 minutes playing around with the K3 TX equalizer to get a nice flat spectrum. Alan N1AL ______________________________________________________________ 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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