P3 display...
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I have a question about the P3 -- the cursor width shows the filter width. But the P3 shows signals outside of the filter bandwidth. This must mean that the sample of the IF signal is before the roofing filters. If that is the case then I am assuming that the signal within the frame of the cursor is not a signal that has passed through my roofing filters.
Is this a correct interpretation? 73, phil, K7PEH Sent from my iPad ______________________________________________________________ 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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Notice that changing the filters does nothing to the display. So the signal sample is ahead of them. Bill K9YEQ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Phil Hystad Sent: Wednesday, February 23, 2011 11:57 AM To: [hidden email] Subject: [Elecraft] P3 display... I have a question about the P3 -- the cursor width shows the filter width. But the P3 shows signals outside of the filter bandwidth. This must mean that the sample of the IF signal is before the roofing filters. If that is the case then I am assuming that the signal within the frame of the cursor is not a signal that has passed through my roofing filters. Is this a correct interpretation? 73, phil, K7PEH Sent from my iPad ______________________________________________________________ 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 Phil Hystad-3
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In reply to this post by Bill K9YEQ
The K3 IF output to the P3 comes from the Post-amp following the first mixer, ahead of the crystal filters. The only upstream filters are the broad bandpass filters, each of which covers an entire band. In addition, the K3 applies no AGC to the stages ahead of the IF output, which makes possible the P3 absolute amplitude calibration. It's also the reason the P3 has a relay-controlled amplifier, which you will hear switching out whenever really strong signals appear on the band. This keeps the ADC in the P3 from saturating.
73, Scott K9MA On Feb 23, 2011, at 12:37 PM, Bill K9YEQ wrote: > > Notice that changing the filters does nothing to the display. So the > signal sample is ahead of them. > > Bill > K9YEQ > > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Phil Hystad > Sent: Wednesday, February 23, 2011 11:57 AM > To: [hidden email] > Subject: [Elecraft] P3 display... > > I have a question about the P3 -- the cursor width shows the filter width. > But the P3 shows signals outside of the filter bandwidth. This must mean > that the sample of the IF signal is before the roofing filters. If that is > the case then I am assuming that the signal within the frame of the cursor > is not a signal that has passed through my roofing filters. > > Is this a correct interpretation? > > 73, phil, K7PEH > Scott Ellington Madison, Wisconsin USA ______________________________________________________________ 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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Thanks for all the answers.
I was most curious as to the filter width (cursor) and the signal after the filter. Thus, my setup question/or premiss was setting the stage for my ultimate question on the filter. So, what I seem to be understanding from these answers is that the filter width itself does not affect the display of the signal I am seeing. Thus, if I am looking at a 6 KHz wide signal and I apply my 400 Hz filter, the 6 KHz signal displayed on the screen it left alone and unaffected by my filter choice other then the fact that the cursor itself has changed size. phil On Feb 23, 2011, at 11:08 AM, Scott Ellington wrote: > The K3 IF output to the P3 comes from the Post-amp following the first mixer, ahead of the crystal filters. The only upstream filters are the broad bandpass filters, each of which covers an entire band. In addition, the K3 applies no AGC to the stages ahead of the IF output, which makes possible the P3 absolute amplitude calibration. It's also the reason the P3 has a relay-controlled amplifier, which you will hear switching out whenever really strong signals appear on the band. This keeps the ADC in the P3 from saturating. > > 73, > > Scott K9MA > > > On Feb 23, 2011, at 12:37 PM, Bill K9YEQ wrote: > >> >> Notice that changing the filters does nothing to the display. So the >> signal sample is ahead of them. >> >> Bill >> K9YEQ >> >> >> -----Original Message----- >> From: [hidden email] >> [mailto:[hidden email]] On Behalf Of Phil Hystad >> Sent: Wednesday, February 23, 2011 11:57 AM >> To: [hidden email] >> Subject: [Elecraft] P3 display... >> >> I have a question about the P3 -- the cursor width shows the filter width. >> But the P3 shows signals outside of the filter bandwidth. This must mean >> that the sample of the IF signal is before the roofing filters. If that is >> the case then I am assuming that the signal within the frame of the cursor >> is not a signal that has passed through my roofing filters. >> >> Is this a correct interpretation? >> >> 73, phil, K7PEH >> > > Scott Ellington > Madison, Wisconsin > USA > > > > ______________________________________________________________ > 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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That's exactly right, Phil.
73, Scott K9MA On Feb 23, 2011, at 3:28 PM, Phil Hystad wrote: > Thanks for all the answers. > > I was most curious as to the filter width (cursor) and the signal after the filter. Thus, my setup question/or premiss was setting the stage for my ultimate question on the filter. > > So, what I seem to be understanding from these answers is that the filter width itself does not affect the display of the signal I am seeing. Thus, if I am looking at a 6 KHz wide signal and I apply my 400 Hz filter, the 6 KHz signal displayed on the screen it left alone and unaffected by my filter choice other then the fact that the cursor itself has changed size. > > phil > > On Feb 23, 2011, at 11:08 AM, Scott Ellington wrote: > >> The K3 IF output to the P3 comes from the Post-amp following the first mixer, ahead of the crystal filters. The only upstream filters are the broad bandpass filters, each of which covers an entire band. In addition, the K3 applies no AGC to the stages ahead of the IF output, which makes possible the P3 absolute amplitude calibration. It's also the reason the P3 has a relay-controlled amplifier, which you will hear switching out whenever really strong signals appear on the band. This keeps the ADC in the P3 from saturating. >> >> 73, >> >> Scott K9MA >> >> >> On Feb 23, 2011, at 12:37 PM, Bill K9YEQ wrote: >> >>> >>> Notice that changing the filters does nothing to the display. So the >>> signal sample is ahead of them. >>> >>> Bill >>> K9YEQ >>> >>> >>> -----Original Message----- >>> From: [hidden email] >>> [mailto:[hidden email]] On Behalf Of Phil Hystad >>> Sent: Wednesday, February 23, 2011 11:57 AM >>> To: [hidden email] >>> Subject: [Elecraft] P3 display... >>> >>> I have a question about the P3 -- the cursor width shows the filter width. >>> But the P3 shows signals outside of the filter bandwidth. This must mean >>> that the sample of the IF signal is before the roofing filters. If that is >>> the case then I am assuming that the signal within the frame of the cursor >>> is not a signal that has passed through my roofing filters. >>> >>> Is this a correct interpretation? >>> >>> 73, phil, K7PEH >>> >> >> Scott Ellington >> Madison, Wisconsin >> USA >> >> >> >> ______________________________________________________________ >> 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 Scott Ellington Madison, Wisconsin USA ______________________________________________________________ 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 Scott Ellington
Has anyone figured out the possible purpose of those unused holes in the P3 backpanel? One of them labeled "sensor" ??? 73, K3UJ ______________________________________________________________ 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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There has been some rumours..but nothing set in concrete that I have read...:-(
Al, N1AL might chime in with some secret squirrel stuff he has brewing in his lab..howz about it Al? 73's Gary On Thu, Feb 24, 2011 at 8:13 AM, Bill <[hidden email]> wrote: > > Has anyone figured out the possible purpose of those unused holes in the P3 backpanel? > > One of them labeled "sensor" ??? > > 73, K3UJ > ______________________________________________________________ > 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 > -- VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679 Dare to be different!!! ______________________________________________________________ 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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It wouldn't be all that difficult for a good engineer to add on some stuff
to fill those holes. I bet Wayne and Eric have something coming up soon. They fixed my k144 with Dual receivers without me even knowing they had done so, but then I don't always read the attached update logs. The P3 is a wonderful piece of equipment. Based on what they keep doing I may be "forced" to buy a KPA500 and sell my 2.5KFx. Bill K9YEQ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Gary Gregory Sent: Wednesday, February 23, 2011 6:05 PM To: Bill Cc: [hidden email] Subject: Re: [Elecraft] P3, what lies ahead? There has been some rumours..but nothing set in concrete that I have read...:-( Al, N1AL might chime in with some secret squirrel stuff he has brewing in his lab..howz about it Al? 73's Gary On Thu, Feb 24, 2011 at 8:13 AM, Bill <[hidden email]> wrote: > > Has anyone figured out the possible purpose of those unused holes in the P3 backpanel? > > One of them labeled "sensor" ??? > > 73, K3UJ ______________________________________________________________ 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 Able2fly
I just assembled P3 two days ago. One of the things I would like to see is
the IQ output of the P3. The signals are definitely generated in P3 and I would guess it is just the matter of buffer and connector. With these signals and decent sound card one can play with PSDR software (open source BTW) or number of other similar programs and even run skimmer for the RBN. How cool is that? 73, Igor, N1YX -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill Sent: Wednesday, February 23, 2011 5:13 PM To: [hidden email] Subject: [Elecraft] P3, what lies ahead? Has anyone figured out the possible purpose of those unused holes in the P3 backpanel? One of them labeled "sensor" ??? 73, K3UJ ______________________________________________________________ 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 Able2fly
Hi Bill The most logical next step would be transmit monitoring. I would like to see the facility for 2 directional couplers. One at the output of the K3 and one at the output of the amp. It would also be nice if you could have IN and OUT for these directional couplers so that you could use it for scope monitoring or for inserting crystal notch filters inline for serious IMD monitoring of your amp. How far the P3 evolves into test instrument or a toy accessory, is really up to Elecraft. The P3 has sufficient performance to be a test instrument rather than being just a toy bandscope. The review in QST alludes to this possibility. Telepost's new LP500 is where the P3 should be heading. However we will just have to wait and see what comes out from the end of the P3 engineering pipeline. My vote is for TX Monitoring and spectrum analyzer features. A tracking generator would be nice for homebrewers as well. 73 John --- On Wed, 2/23/11, Bill <[hidden email]> wrote: > From: Bill <[hidden email]> > Subject: [Elecraft] P3, what lies ahead? > To: [hidden email] > Date: Wednesday, February 23, 2011, 2:13 PM > > Has anyone figured out the possible purpose of those unused > holes in the P3 backpanel? > > One of them labeled "sensor" ??? > > 73, K3UJ > ______________________________________________________________ > 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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Juergen,
At the risk of sounding as a 'me too'....me too! Come on Al...what have you got going in the 'secret squirel dept?' Gary On Thu, Feb 24, 2011 at 11:42 AM, juergen <[hidden email]> wrote: > > Hi Bill > > The most logical next step would be transmit monitoring. > > I would like to see the facility for 2 directional couplers. One at the output of the K3 and one at the output of the amp. It would also be nice if you could have IN and OUT for these directional couplers so that you could use it for scope monitoring or for inserting crystal notch filters inline for serious IMD monitoring of your amp. > > How far the P3 evolves into test instrument or a toy accessory, is really up to Elecraft. The P3 has sufficient performance to be a test instrument rather than being just a toy bandscope. The review in QST alludes to this possibility. > > Telepost's new LP500 is where the P3 should be heading. However we will just have to wait and see what comes out from the end of the P3 engineering pipeline. > > My vote is for TX Monitoring and spectrum analyzer features. A tracking generator would be nice for homebrewers as well. > > 73 > John > --- On Wed, 2/23/11, Bill <[hidden email]> wrote: > >> From: Bill <[hidden email]> >> Subject: [Elecraft] P3, what lies ahead? >> To: [hidden email] >> Date: Wednesday, February 23, 2011, 2:13 PM >> >> Has anyone figured out the possible purpose of those unused >> holes in the P3 backpanel? >> >> One of them labeled "sensor" ??? >> >> 73, K3UJ >> ______________________________________________________________ >> 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 > -- VK4FD - Motorhome Mobile http://www.qsl.net/vk4fd/ K3 #679 Dare to be different!!! ______________________________________________________________ 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 juergen piezo
Yes, I like this as well.
cheers, Johnny VR2XMC ________________________________ 寄件人﹕ juergen <[hidden email]> 收件人﹕ [hidden email]; Bill <[hidden email]> 傳送日期﹕ 2011/2/24 (四) 9:42:07 AM 主題： Re: [Elecraft] P3, what lies ahead? Hi Bill The most logical next step would be transmit monitoring. I would like to see the facility for 2 directional couplers. One at the output of the K3 and one at the output of the amp. It would also be nice if you could have IN and OUT for these directional couplers so that you could use it for scope monitoring or for inserting crystal notch filters inline for serious IMD monitoring of your amp. How far the P3 evolves into test instrument or a toy accessory, is really up to Elecraft. The P3 has sufficient performance to be a test instrument rather than being just a toy bandscope. The review in QST alludes to this possibility. Telepost's new LP500 is where the P3 should be heading. However we will just have to wait and see what comes out from the end of the P3 engineering pipeline. My vote is for TX Monitoring and spectrum analyzer features. A tracking generator would be nice for homebrewers as well. 73 John --- On Wed, 2/23/11, Bill <[hidden email]> wrote: > From: Bill <[hidden email]> > Subject: [Elecraft] P3, what lies ahead? > To: [hidden email] > Date: Wednesday, February 23, 2011, 2:13 PM > > Has anyone figured out the possible purpose of those unused > holes in the P3 backpanel? > > One of them labeled "sensor" ??? > > 73, K3UJ > ______________________________________________________________ > 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 ______________________________________________________________ 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 juergen piezo
I used mine the other day to calibrate my filters gains. It was easy to get them all matched up using the XG2 and the amplitude scale. Another use I plan for it is to adjust the preamp's in my xv432, xv144 and other devices with preamp's using the N-GEN. It should function very well as a piece of test gear too. 73, Tom Childers Radio Amateur N5GE Licensed since 1976 QCWA Life Member 35102 ARRL Life Member Retired Professional C# Software developer http://www.n5ge.net On Wed, 23 Feb 2011 17:42:07 -0800 (PST), juergen <[hidden email]> wrote: > >Hi Bill > >The most logical next step would be transmit monitoring. > >I would like to see the facility for 2 directional couplers. One at the output of the K3 and one at the output of the amp. It would also be nice if you could have IN and OUT for these directional couplers so that you could use it for scope monitoring or for inserting crystal notch filters inline for serious IMD monitoring of your amp. > >How far the P3 evolves into test instrument or a toy accessory, is really up to Elecraft. The P3 has sufficient performance to be a test instrument rather than being just a toy bandscope. The review in QST alludes to this possibility. > >Telepost's new LP500 is where the P3 should be heading. However we will just have to wait and see what comes out from the end of the P3 engineering pipeline. > >My vote is for TX Monitoring and spectrum analyzer features. A tracking generator would be nice for homebrewers as well. > >73 >John >--- On Wed, 2/23/11, Bill <[hidden email]> wrote: > >> From: Bill <[hidden email]> >> Subject: [Elecraft] P3, what lies ahead? >> To: [hidden email] >> Date: Wednesday, February 23, 2011, 2:13 PM >> >> Has anyone figured out the possible purpose of those unused >> holes in the P3 backpanel? >> >> One of them labeled "sensor" ??? >> >> 73, K3UJ >> ______________________________________________________________ >> 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 ______________________________________________________________ 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
Amateur Radio Operator N5GE
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In reply to this post by k.igor
Don't hold your breath waiting for that. I lobbied long and hard for that capability (buffered IQ outputs) from the very beginning ... starting back when Elecraft first announced they would be introducing the P3. They obviously didn't include it, though, and in spite of several public and private queries from me regarding the reason for that omission I never got a single answer. The lack of IQ outputs is the single biggest reason why I will not buy a P3 (the other reason is that there is no capability to display the 2nd receiver even if I hardware hack the K3 to bring out the 2nd IF). Anyone who wants to run CW Skimmer or any other third party SDR software will have to buy another piece of hardware to do it, when the P3 could have easily provided that capability. 73, Dave AB7E On 2/23/2011 6:03 PM, Igor Kosvin wrote: > I just assembled P3 two days ago. One of the things I would like to see is > the IQ output of the P3. The signals are definitely generated in P3 and I > would guess it is just the matter of buffer and connector. With these > signals and decent sound card one can play with PSDR software (open source > BTW) or number of other similar programs and even run skimmer for the RBN. > How cool is that? > 73, > Igor, N1YX > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Bill > Sent: Wednesday, February 23, 2011 5:13 PM > To: [hidden email] > Subject: [Elecraft] P3, what lies ahead? > > > Has anyone figured out the possible purpose of those unused holes in the P3 > backpanel? > > One of them labeled "sensor" ??? > > 73, K3UJ > ______________________________________________________________ > 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 > 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 N5GE
I have to ask, just how did you accomplish this with the P3? Since
the P3 output comes off the radio before the "Roofing" filters are inserted, the P3 should not show any result of filtering. Now, I managed to smooth out my filter gains by using Hamscope which is an audio spectrum visualization tool. This worked pretty well. Funny thing, my 200Hz fileter with a -86Hz offset is pretty well centered about the centerline, but my 400 Hz 8-pole with 0 offset, is way off center! So are the 1.8 and 2.8 filters. What gives....? ...bc nr4c Quoting Amateur Radio Operator N5GE <[hidden email]>: > > I used mine the other day to calibrate my filters gains. It was easy to get > them all matched up using the XG2 and the amplitude scale. > > Another use I plan for it is to adjust the preamp's in my xv432, > xv144 and other > devices with preamp's using the N-GEN. > > It should function very well as a piece of test gear too. > > 73, > > Tom Childers > Radio Amateur N5GE > Licensed since 1976 > QCWA Life Member 35102 > ARRL Life Member > Retired Professional > C# Software developer > http://www.n5ge.net > > On Wed, 23 Feb 2011 17:42:07 -0800 (PST), juergen > <[hidden email]> wrote: > >> >> Hi Bill >> >> The most logical next step would be transmit monitoring. >> >> I would like to see the facility for 2 directional couplers. One at >> the output of the K3 and one at the output of the amp. It would >> also be nice if you could have IN and OUT for these directional >> couplers so that you could use it for scope monitoring or for >> inserting crystal notch filters inline for serious IMD monitoring >> of your amp. >> >> How far the P3 evolves into test instrument or a toy accessory, is >> really up to Elecraft. The P3 has sufficient performance to be a >> test instrument rather than being just a toy bandscope. The review >> in QST alludes to this possibility. >> >> Telepost's new LP500 is where the P3 should be heading. However we >> will just have to wait and see what comes out from the end of the >> P3 engineering pipeline. >> >> My vote is for TX Monitoring and spectrum analyzer features. A >> tracking generator would be nice for homebrewers as well. >> >> 73 >> John >> --- On Wed, 2/23/11, Bill <[hidden email]> wrote: >> >>> From: Bill <[hidden email]> >>> Subject: [Elecraft] P3, what lies ahead? >>> To: [hidden email] >>> Date: Wednesday, February 23, 2011, 2:13 PM >>> >>> Has anyone figured out the possible purpose of those unused >>> holes in the P3 backpanel? >>> >>> One of them labeled "sensor" ??? >>> >>> 73, K3UJ >>> ______________________________________________________________ >>> 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 > > ______________________________________________________________ > 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 David Gilbert
Note that, in the P3, the I and Q signals exist only in the digital domain. Without a bunch of additional interface electronics, they're not compatible with a sound card input, so it's easy to understand why Elecraft didn't do that. I suppose they could be brought out on a USB, but that would also add complexity and cost. Both could be done, but Elecraft has to set realistic priorities.
The P3 clearly illustrates the value of Elecraft's modular approach: Rather than having to wait until development of all the options is done, we get to use the basic P3 now, and it does it's job very well. In addition, new features can be added in response to user feedback, and we've seen plenty of examples of that. 73, Scott K9MA On Feb 24, 2011, at 11:06 AM, David Gilbert wrote: > > Don't hold your breath waiting for that. I lobbied long and hard for > that capability (buffered IQ outputs) from the very beginning ... > starting back when Elecraft first announced they would be introducing > the P3. They obviously didn't include it, though, and in spite of > several public and private queries from me regarding the reason for > that omission I never got a single answer. The lack of IQ outputs is > the single biggest reason why I will not buy a P3 (the other reason is > that there is no capability to display the 2nd receiver even if I > hardware hack the K3 to bring out the 2nd IF). Anyone who wants to run > CW Skimmer or any other third party SDR software will have to buy > another piece of hardware to do it, when the P3 could have easily > provided that capability. > > 73, > Dave AB7E > > > > On 2/23/2011 6:03 PM, Igor Kosvin wrote: >> I just assembled P3 two days ago. One of the things I would like to see is >> the IQ output of the P3. The signals are definitely generated in P3 and I >> would guess it is just the matter of buffer and connector. With these >> signals and decent sound card one can play with PSDR software (open source >> BTW) or number of other similar programs and even run skimmer for the RBN. >> How cool is that? >> 73, >> Igor, N1YX >> >> -----Original Message----- >> From: [hidden email] >> [mailto:[hidden email]] On Behalf Of Bill >> Sent: Wednesday, February 23, 2011 5:13 PM >> To: [hidden email] >> Subject: [Elecraft] P3, what lies ahead? >> >> >> Has anyone figured out the possible purpose of those unused holes in the P3 >> backpanel? >> >> One of them labeled "sensor" ??? >> >> 73, K3UJ >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ > 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 Scott Ellington Madison, Wisconsin USA ______________________________________________________________ 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 David Gilbert
> They obviously didn't include it, though, and in spite of several > public and private queries from me regarding the reason for that > omission I never got a single answer. Examination of the P3 data would suggest that I/Q do not exist except in the digital domain. I highly doubt that the hardware has sufficient I/O to support the add-in DAC necessary to provide analog I/Q for an external sound card. > (the other reason is that there is no capability to display the 2nd > receiver even if I hardware hack the K3 to bring out the 2nd IF) That's incorrect. All you need to do is provide an IF signal from the KRX3 instead of the main receiver. Th P3 will happily display that signal although the VFO A/VFO B controls will be reversed. I don't think it would take a whole lot for Al to add an "A/B" function although I'm certain it is *way* down the priority list. > Anyone who wants to run CW Skimmer or any other third party SDR > software will have to buy another piece of hardware to do it, when > the P3 could have easily provided that capability. It is far from "easy" or cheap to provide that capability. Given the structure of the P3 the necessary independent I/Q signals are not preset ... the only accessible I/Q are based on the selected display width and are locked to the display's center frequency. To provide the support you seek would take a second AD6620, a second control interface from the dsPIC, DAC and audio drivers - none of which are available in the P3. The cost of the "add on" to drive a separate sound card for CW Skimmer would be substantially more than the LP-Pan hardware and provide no additional benefit. 73, ... Joe, W4TV On 2/24/2011 12:06 PM, David Gilbert wrote: > > Don't hold your breath waiting for that. I lobbied long and hard for > that capability (buffered IQ outputs) from the very beginning ... > starting back when Elecraft first announced they would be introducing > the P3. They obviously didn't include it, though, and in spite of > several public and private queries from me regarding the reason for > that omission I never got a single answer. The lack of IQ outputs is > the single biggest reason why I will not buy a P3 (the other reason is > that there is no capability to display the 2nd receiver even if I > hardware hack the K3 to bring out the 2nd IF). Anyone who wants to run > CW Skimmer or any other third party SDR software will have to buy > another piece of hardware to do it, when the P3 could have easily > provided that capability. > > 73, > Dave AB7E > > > > On 2/23/2011 6:03 PM, Igor Kosvin wrote: >> I just assembled P3 two days ago. One of the things I would like to see is >> the IQ output of the P3. The signals are definitely generated in P3 and I >> would guess it is just the matter of buffer and connector. With these >> signals and decent sound card one can play with PSDR software (open source >> BTW) or number of other similar programs and even run skimmer for the RBN. >> How cool is that? >> 73, >> Igor, N1YX >> >> -----Original Message----- >> From: [hidden email] >> [mailto:[hidden email]] On Behalf Of Bill >> Sent: Wednesday, February 23, 2011 5:13 PM >> To: [hidden email] >> Subject: [Elecraft] P3, what lies ahead? >> >> >> Has anyone figured out the possible purpose of those unused holes in the P3 >> backpanel? >> >> One of them labeled "sensor" ??? >> >> 73, K3UJ >> ______________________________________________________________ >> 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 >> > ______________________________________________________________ > 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 Scott Ellington
I operate my K3 remotely. Even though I would dearly love to have a pan display, the P3 would not work remotely. So I just ordered a LP-PAN, and will use either LogMeIn or Skype Screen Sharing to remotely view the display on the PC. If the P3 had I/Q outputs, that would make it a viable alternative to LP Pan for remote use. John.
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In reply to this post by Scott Ellington
Doing it via a sound card would be counterproductive, but I fail to see how bringing them out digitally would require that much additional cost or complexity. We're talking bits of data here, and there are other ham radio products (including SDR receivers like the QS1R and SDR-IQ) with USB interfaces. But in case I am wrong on that score (entirely possible), why couldn't it have been made available as an option at additional cost? Space isn't an issue, either internally or on the back panel. I simply don't understand the reason for the omission, and I'm betting that this message thread doesn't lead to an answer either. 73, Dave AB7E On 2/24/2011 10:28 AM, Scott Ellington wrote: > Note that, in the P3, the I and Q signals exist only in the digital domain. Without a bunch of additional interface electronics, they're not compatible with a sound card input, so it's easy to understand why Elecraft didn't do that. I suppose they could be brought out on a USB, but that would also add complexity and cost. Both could be done, but Elecraft has to set realistic priorities. > > The P3 clearly illustrates the value of Elecraft's modular approach: Rather than having to wait until development of all the options is done, we get to use the basic P3 now, and it does it's job very well. In addition, new features can be added in response to user feedback, and we've seen plenty of examples of that. > > 73, > > Scott K9MA > > > On Feb 24, 2011, at 11:06 AM, David Gilbert wrote: > >> Don't hold your breath waiting for that. I lobbied long and hard for >> that capability (buffered IQ outputs) from the very beginning ... >> starting back when Elecraft first announced they would be introducing >> the P3. They obviously didn't include it, though, and in spite of >> several public and private queries from me regarding the reason for >> that omission I never got a single answer. The lack of IQ outputs is >> the single biggest reason why I will not buy a P3 (the other reason is >> that there is no capability to display the 2nd receiver even if I >> hardware hack the K3 to bring out the 2nd IF). Anyone who wants to run >> CW Skimmer or any other third party SDR software will have to buy >> another piece of hardware to do it, when the P3 could have easily >> provided that capability. >> >> 73, >> Dave AB7E >> >> >> >> On 2/23/2011 6:03 PM, Igor Kosvin wrote: >>> I just assembled P3 two days ago. One of the things I would like to see is >>> the IQ output of the P3. The signals are definitely generated in P3 and I >>> would guess it is just the matter of buffer and connector. With these >>> signals and decent sound card one can play with PSDR software (open source >>> BTW) or number of other similar programs and even run skimmer for the RBN. >>> How cool is that? >>> 73, >>> Igor, N1YX >>> >>> -----Original Message----- >>> From: [hidden email] >>> [mailto:[hidden email]] On Behalf Of Bill >>> Sent: Wednesday, February 23, 2011 5:13 PM >>> To: [hidden email] >>> Subject: [Elecraft] P3, what lies ahead? >>> >>> >>> Has anyone figured out the possible purpose of those unused holes in the P3 >>> backpanel? >>> >>> One of them labeled "sensor" ??? >>> >>> 73, K3UJ >>> ______________________________________________________________ >>> 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 >>> >> ______________________________________________________________ >> 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 > Scott Ellington > Madison, Wisconsin > USA > > > > ______________________________________________________________ > 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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