Re: [Elecraft] K4 Receive Filter question
On 1/19/2021 5:24 PM, Bill Frantz wrote: one of the most important performance characteristics, which is the user interface (UI). How easy it the radio to use? YUP! And like Bill, I find the Elecraft UI excellent, VERY intuitive for users of RADIOS, with anything you need while USING them to be on knobs or switches on the front panel, with once-in-a-while tweaks like VOX and ANTI-VOX, or choosing between mic or mic plus computer playback for a contest, do I want my mic on the front or rear panel, and what accessories or options are in my radio are on a top level menu. 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] K4 Receive Filter question
Not to pick on Bruce, but there have been many posts to this thread with essentially the same thought. However, none of them talk about what I see as one of the most important performance characteristics, which is the user interface (UI). How easy it the radio to use? For me, I do a lot of digital modes. Here I want to monitor all of the power output, SWR, and ALC. On my K3, I have to switch between them. On the K4 I can have them all on the screen. How easy is it to tune to a signal I see on the panadapter? On the P3, I need to move the cursor (via a knob) to be on top of the signal and press a button. Honestly, it's easier to turn the big knob. On the K4 I touch the touch screen. (I hope this screen is better at detecting my touch than my iPhone.) There are probably a bunch of other examples too. And, since I'm interested in remote operation, I think that will be a lot easier with a K4. And I haven't even mentioned TX or RX performance. But it's an Elecraft, so I'm not worried. 73 Bill AE6JV On 1/19/21 at 1:40 PM, wa8...@gmail.com (BRUCE WW8II) wrote: If and when I spend my cash I am not looking for the pretty blinkie colored lights and a fancy screen, I want performance. --- Bill Frantz| Truth and love must prevail | Periwinkle (408)348-7900 | over lies and hate. | 150 Rivermead Rd #235 www.pwpconsult.com | - Vaclav Havel | Peterborough, NH 03458 __ 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] K4 Receive Filter question
I happen to own the K3S that is #5 or Rob's list. I also got tired of waiting on the K4 and having a burning desire for a new radio I have a month-old TS-890, which is now my primary radio. The K3S is set up in a receive-only state, sharing the RX antenna out of the '890. A few mornings ago I was tuning 160 near sunrise and copied a fishing buoy 60 Hz above one of the commonly used frequencies (forget which one). My friend, and local ham, N7DD began calling CQ 60 Hz below the buoy. Larry runs an Icom 7851, which is very clean and a BIG amplifier. He is at least S9+40 db. On the TS-890, cranked down to 80 Hz BW, I could still copy the buoy which was S6 or so. On the K3S I heard N7DD calling CQ. Without QRM the rigs are comparable at hearing signals in the noise but the Kenwood sounds better. Wes N7WS On 1/19/2021 12:38 PM, Louandzip via Elecraft wrote: I own a radio that's currently #1 on Sherwood's list. My 20 year old K2 is essentially equal at digging weak CW out of the noise (always dominated by band noise and not the noise floor of the rig) in virtually all situations I've run into. The K2 has no KSSB so I don't compare it on SSB. If I was up against a lot of really strong close-by sigs, presumably the new rig would win, but I haven't yet run into a situation with the two rigs side by side where big nearby sigs have actually caused a discernible difference. Comparing SSB with other rigs, the new rig can beat the others on readability of weak sigs in noise, but I don't think it's due to the fundamental performance numbers in these cases but rather the DSP algorithm which makes the difference, and I don't believe this is quantified in the testing done by Sherwood or ARRL, except perhaps in subjective comments in the text of a QST review. . On Tuesday, January 19, 2021, 12:13:20 PM MST, George Thornton wrote: I have followed the Sherwood Receiver test data over the years and I know Elecraft has always been in or near the top spot. I also would be reluctant to upgrade to a K4 if my K3 is the same or pretty close to the same in the key performance characteristics. I wonder whether we are nearing the theoretical limit of what can be gained in receiver performance. The difference among the top eight to ten on the Sherwood list is not likely to be practically significant. __ 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] K4 Receive Filter question
I own a radio that's currently #1 on Sherwood's list. My 20 year old K2 is essentially equal at digging weak CW out of the noise (always dominated by band noise and not the noise floor of the rig) in virtually all situations I've run into. The K2 has no KSSB so I don't compare it on SSB. If I was up against a lot of really strong close-by sigs, presumably the new rig would win, but I haven't yet run into a situation with the two rigs side by side where big nearby sigs have actually caused a discernible difference. Comparing SSB with other rigs, the new rig can beat the others on readability of weak sigs in noise, but I don't think it's due to the fundamental performance numbers in these cases but rather the DSP algorithm which makes the difference, and I don't believe this is quantified in the testing done by Sherwood or ARRL, except perhaps in subjective comments in the text of a QST review. . On Tuesday, January 19, 2021, 12:13:20 PM MST, George Thornton wrote: I have followed the Sherwood Receiver test data over the years and I know Elecraft has always been in or near the top spot. I also would be reluctant to upgrade to a K4 if my K3 is the same or pretty close to the same in the key performance characteristics. I wonder whether we are nearing the theoretical limit of what can be gained in receiver performance. The difference among the top eight to ten on the Sherwood list is not likely to be practically significant. -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of BRUCE WW8II Sent: Tuesday, January 19, 2021 10:40 AM To: Louandzip Cc: elecraft Subject: Re: [Elecraft] K4 Receive Filter question I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the noise floor on SSB now, (that is why I presently own a K3s and a P3VGA) so I guess I will have to wait for the real answer. I really cannot believe that Elecraft did not run their own test. If and when I spend my cash I am not looking for the pretty blinkie colored lights and a fancy screen, I want performance. My really big issue is: receiver noise floor, sensitivity and DSP that does not distort or degrade the incoming signal. But thank all of you for your input and I truly appreciate all the comments. Bruce WW8II On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft < elecraft@mailman.qth.net> wrote: > That's not a simple or easy question to answer, especially since > there's been no independent test of a K4, and there are many different > criteria that go into it. That said, I'll go out on a limb and say > that in most all practical situations on the air, it won't be. I say > that because I've listened to and half-assedly compared a number of > very good radios and some less good radios on the air. They might > sound different, and take some tweaking of the controls to make them > sound a similar as possible, but in the end I couldn't copy sigs > better on one than the other. The K3 is really good in the tests, and > I'm confident the K4 will surpass it, but that's at level that will > only matter in what I consider to be exceptional circumstances. > > I'll add that I'm not the radio connoisseur that some are, and what I > feel is largely the same, others may find hugely different. That > doesn't stop me from wanting the best, even if I believe it won't make > a practical difference in my operating. > > > > > On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II < > wa8...@gmail.com> wrote: > > I also would appreciate a real answer to the question. The question > is will the K4 or K4D be as good or better on receive than my K3s with > the 2.1kHz and the 200Hz filters. > > Bruce WW8II > > On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft < > elecraft@mailman.qth.net> > wrote: > > > I believe there are no crystal Roofing Filters in the standard K4 model. > > Yet the manual talks about "one set of receive filters". Please > > advise > the > > type and bandwidth of these filters? (DSP?) > > > > From the K4 Manual: There are three models: the basic K4, with one > > set > of > > receive filters and one analog-to-digital converter (ADC); the K4D, > > with > a > > second set of receive filters and a second ADC; and the K4HD, which > > adds > a > > superheterodyne front end that can be enabled as needed to provide > > even greater dynamic range. The superhet module uses > > high-performance, narrow-band crystal filters such as those used in the > > Elecraft K3S. > Thanks > > & 73, Dick- K9OM > >
Re: [Elecraft] K4 Receive Filter question
I have followed the Sherwood Receiver test data over the years and I know Elecraft has always been in or near the top spot. I also would be reluctant to upgrade to a K4 if my K3 is the same or pretty close to the same in the key performance characteristics. I wonder whether we are nearing the theoretical limit of what can be gained in receiver performance. The difference among the top eight to ten on the Sherwood list is not likely to be practically significant. -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of BRUCE WW8II Sent: Tuesday, January 19, 2021 10:40 AM To: Louandzip Cc: elecraft Subject: Re: [Elecraft] K4 Receive Filter question I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the noise floor on SSB now, (that is why I presently own a K3s and a P3VGA) so I guess I will have to wait for the real answer. I really cannot believe that Elecraft did not run their own test. If and when I spend my cash I am not looking for the pretty blinkie colored lights and a fancy screen, I want performance. My really big issue is: receiver noise floor, sensitivity and DSP that does not distort or degrade the incoming signal. But thank all of you for your input and I truly appreciate all the comments. Bruce WW8II On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft < elecraft@mailman.qth.net> wrote: > That's not a simple or easy question to answer, especially since > there's been no independent test of a K4, and there are many different > criteria that go into it. That said, I'll go out on a limb and say > that in most all practical situations on the air, it won't be. I say > that because I've listened to and half-assedly compared a number of > very good radios and some less good radios on the air. They might > sound different, and take some tweaking of the controls to make them > sound a similar as possible, but in the end I couldn't copy sigs > better on one than the other. The K3 is really good in the tests, and > I'm confident the K4 will surpass it, but that's at level that will > only matter in what I consider to be exceptional circumstances. > > I'll add that I'm not the radio connoisseur that some are, and what I > feel is largely the same, others may find hugely different. That > doesn't stop me from wanting the best, even if I believe it won't make > a practical difference in my operating. > > > > > On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II < > wa8...@gmail.com> wrote: > > I also would appreciate a real answer to the question. The question > is will the K4 or K4D be as good or better on receive than my K3s with > the 2.1kHz and the 200Hz filters. > > Bruce WW8II > > On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft < > elecraft@mailman.qth.net> > wrote: > > > I believe there are no crystal Roofing Filters in the standard K4 model. > > Yet the manual talks about "one set of receive filters". Please > > advise > the > > type and bandwidth of these filters? (DSP?) > > > > From the K4 Manual: There are three models: the basic K4, with one > > set > of > > receive filters and one analog-to-digital converter (ADC); the K4D, > > with > a > > second set of receive filters and a second ADC; and the K4HD, which > > adds > a > > superheterodyne front end that can be enabled as needed to provide > > even greater dynamic range. The superhet module uses > > high-performance, narrow-band crystal filters such as those used in the > > Elecraft K3S. > Thanks > > & 73, Dick- K9OM > > __ > > 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 > > wa8...@gmail.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 > louand...@yahoo.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
Re: [Elecraft] K4 Receive Filter question
Bruce, Below are the receiver sensitivity specs from page 42 of the recently updated manual Sensitivity (MDS) (Typical values; main or sub RX, BW = 500 Hz) 0.1-1.5 MHz*: Preamp OFF/1/2: -120/-130/-135 dBm 1.5-23 MHz: Preamp OFF/1/2: -120/-132/-137 dBm 23-54 MHz: Preamp OFF/1/2: -120/-132/-141 dBm *0.1-1.5 MHz MDS measured at RX antenna inputs. When using shared RX/TX antenna, sensitivity decreases below 1.5 MHz due to intentional high-pass response of T-R switch. de Dave K5MWR On 1/19/2021 12:40, BRUCE WW8II wrote: I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the noise floor on SSB now, (that is why I presently own a K3s and a P3VGA) so I guess I will have to wait for the real answer. I really cannot believe that Elecraft did not run their own test. If and when I spend my cash I am not looking for the pretty blinkie colored lights and a fancy screen, I want performance. My really big issue is: receiver noise floor, sensitivity and DSP that does not distort or degrade the incoming signal. But thank all of you for your input and I truly appreciate all the comments. Bruce WW8II On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft < elecraft@mailman.qth.net> wrote: That's not a simple or easy question to answer, especially since there's been no independent test of a K4, and there are many different criteria that go into it. That said, I'll go out on a limb and say that in most all practical situations on the air, it won't be. I say that because I've listened to and half-assedly compared a number of very good radios and some less good radios on the air. They might sound different, and take some tweaking of the controls to make them sound a similar as possible, but in the end I couldn't copy sigs better on one than the other. The K3 is really good in the tests, and I'm confident the K4 will surpass it, but that's at level that will only matter in what I consider to be exceptional circumstances. I'll add that I'm not the radio connoisseur that some are, and what I feel is largely the same, others may find hugely different. That doesn't stop me from wanting the best, even if I believe it won't make a practical difference in my operating. On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II < wa8...@gmail.com> wrote: I also would appreciate a real answer to the question. The question is will the K4 or K4D be as good or better on receive than my K3s with the 2.1kHz and the 200Hz filters. Bruce WW8II On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft < elecraft@mailman.qth.net> wrote: I believe there are no crystal Roofing Filters in the standard K4 model. Yet the manual talks about "one set of receive filters". Please advise the type and bandwidth of these filters? (DSP?) From the K4 Manual: There are three models: the basic K4, with one set of receive filters and one analog-to-digital converter (ADC); the K4D, with a second set of receive filters and a second ADC; and the K4HD, which adds a superheterodyne front end that can be enabled as needed to provide even greater dynamic range. The superhet module uses high-performance, narrow-band crystal filters such as those used in the Elecraft K3S. Thanks & 73, Dick- K9OM __ 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 wa8...@gmail.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 louand...@yahoo.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 wa8...@gmail.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 do...@suddenlink.net __
Re: [Elecraft] K4 Receive Filter question
I work in the 2 to 3 db above the noise floor CW, and 6 to 10 db above the noise floor on SSB now, (that is why I presently own a K3s and a P3VGA) so I guess I will have to wait for the real answer. I really cannot believe that Elecraft did not run their own test. If and when I spend my cash I am not looking for the pretty blinkie colored lights and a fancy screen, I want performance. My really big issue is: receiver noise floor, sensitivity and DSP that does not distort or degrade the incoming signal. But thank all of you for your input and I truly appreciate all the comments. Bruce WW8II On Tue, Jan 19, 2021 at 10:43 AM Louandzip via Elecraft < elecraft@mailman.qth.net> wrote: > That's not a simple or easy question to answer, especially since there's > been no independent test of a K4, and there are many different criteria > that go into it. That said, I'll go out on a limb and say that in most > all practical situations on the air, it won't be. I say that because I've > listened to and half-assedly compared a number of very good radios and some > less good radios on the air. They might sound different, and take some > tweaking of the controls to make them sound a similar as possible, but in > the end I couldn't copy sigs better on one than the other. The K3 is really > good in the tests, and I'm confident the K4 will surpass it, but that's at > level that will only matter in what I consider to be exceptional > circumstances. > > I'll add that I'm not the radio connoisseur that some are, and what I feel > is largely the same, others may find hugely different. That doesn't stop me > from wanting the best, even if I believe it won't make a practical > difference in my operating. > > > > > On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II < > wa8...@gmail.com> wrote: > > I also would appreciate a real answer to the question. The question is > will the K4 or K4D be as good or better on receive than my K3s with the > 2.1kHz and the 200Hz filters. > > Bruce WW8II > > On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft < > elecraft@mailman.qth.net> > wrote: > > > I believe there are no crystal Roofing Filters in the standard K4 model. > > Yet the manual talks about "one set of receive filters". Please advise > the > > type and bandwidth of these filters? (DSP?) > > > > From the K4 Manual: There are three models: the basic K4, with one set > of > > receive filters and one analog-to-digital converter (ADC); the K4D, with > a > > second set of receive filters and a second ADC; and the K4HD, which adds > a > > superheterodyne front end that can be enabled as needed to provide even > > greater dynamic range. The superhet module uses high-performance, > > narrow-band crystal filters such as those used in the Elecraft K3S. > Thanks > > & 73, Dick- K9OM > > __ > > 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 wa8...@gmail.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 louand...@yahoo.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 wa8...@gmail.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
Re: [Elecraft] K4 Receive Filter question
That's not a simple or easy question to answer, especially since there's been no independent test of a K4, and there are many different criteria that go into it. That said, I'll go out on a limb and say that in most all practical situations on the air, it won't be. I say that because I've listened to and half-assedly compared a number of very good radios and some less good radios on the air. They might sound different, and take some tweaking of the controls to make them sound a similar as possible, but in the end I couldn't copy sigs better on one than the other. The K3 is really good in the tests, and I'm confident the K4 will surpass it, but that's at level that will only matter in what I consider to be exceptional circumstances. I'll add that I'm not the radio connoisseur that some are, and what I feel is largely the same, others may find hugely different. That doesn't stop me from wanting the best, even if I believe it won't make a practical difference in my operating. On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II wrote: I also would appreciate a real answer to the question. The question is will the K4 or K4D be as good or better on receive than my K3s with the 2.1kHz and the 200Hz filters. Bruce WW8II On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft wrote: > I believe there are no crystal Roofing Filters in the standard K4 model. > Yet the manual talks about "one set of receive filters". Please advise the > type and bandwidth of these filters? (DSP?) > > From the K4 Manual: There are three models: the basic K4, with one set of > receive filters and one analog-to-digital converter (ADC); the K4D, with a > second set of receive filters and a second ADC; and the K4HD, which adds a > superheterodyne front end that can be enabled as needed to provide even > greater dynamic range. The superhet module uses high-performance, > narrow-band crystal filters such as those used in the Elecraft K3S. Thanks > & 73, Dick- K9OM > __ > 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 wa8...@gmail.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 louand...@yahoo.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
Re: [Elecraft] K4 Receive Filter question
I also would appreciate a real answer to the question. The question is will the K4 or K4D be as good or better on receive than my K3s with the 2.1kHz and the 200Hz filters. Bruce WW8II On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft wrote: > I believe there are no crystal Roofing Filters in the standard K4 model. > Yet the manual talks about "one set of receive filters". Please advise the > type and bandwidth of these filters? (DSP?) > > From the K4 Manual: There are three models: the basic K4, with one set of > receive filters and one analog-to-digital converter (ADC); the K4D, with a > second set of receive filters and a second ADC; and the K4HD, which adds a > superheterodyne front end that can be enabled as needed to provide even > greater dynamic range. The superhet module uses high-performance, > narrow-band crystal filters such as those used in the Elecraft K3S. Thanks > & 73, Dick- K9OM > __ > 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 wa8...@gmail.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
Re: [Elecraft] K4 Receive Filter question
This refers to the RF bandpass filters in the receiver front end. Geant NQ5T > On Jan 19, 2021, at 12:43 AM, RVZ via Elecraft > wrote: > > I believe there are no crystal Roofing Filters in the standard K4 model. Yet > the manual talks about "one set of receive filters". Please advise the type > and bandwidth of these filters? (DSP?) > > From the K4 Manual: There are three models: the basic K4, with one set of > receive filters and one analog-to-digital converter (ADC); the K4D, with a > second set of receive filters and a second ADC; and the K4HD, which adds a > superheterodyne front end that can be enabled as needed to provide even > greater dynamic range. The superhet module uses high-performance, narrow-band > crystal filters such as those used in the Elecraft K3S. Thanks & 73, Dick- > K9OM > __ > 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 ghyoung...@gmail.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
[Elecraft] K4 Receive Filter question
I believe there are no crystal Roofing Filters in the standard K4 model. Yet the manual talks about "one set of receive filters". Please advise the type and bandwidth of these filters? (DSP?) From the K4 Manual: There are three models: the basic K4, with one set of receive filters and one analog-to-digital converter (ADC); the K4D, with a second set of receive filters and a second ADC; and the K4HD, which adds a superheterodyne front end that can be enabled as needed to provide even greater dynamic range. The superhet module uses high-performance, narrow-band crystal filters such as those used in the Elecraft K3S. Thanks & 73, Dick- K9OM __ 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
