Re: [Elecraft] K3s IF bandwidth?
Jim, The IF takeoff point in the K3 is right after the 8.215mHz mixer, so at that point, it has a very wide bandwidth. The K3 filtering is after that IF takeoff point, so any filtering in the K3 will not affect that bandwidth. I don't know how much wider than 200kHz the IF takeoff might be. 200kHz is a substantial portion of any band. 73, Don W3FPR On 12/25/2017 12:17 PM, Jim Miller wrote: The P3 displays a maximum of 200khz. Is that the maximum useful K3 IF bandwidth or is it wider? 73 Jim ab3cv __ 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 donw...@embarqmail.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] K3s IF bandwidth?
HiIf you connect an sdrplay to the if output you can see over 2mhz bandwidth. 73 Tom Sent from my Samsung Galaxy smartphone. Original message From: Don Wilhelm Date: 2017-12-25 12:31 PM (GMT-05:00) To: Jim Miller , Elecraft@mailman.qth.net Subject: Re: [Elecraft] K3s IF bandwidth? Jim, The IF takeoff point in the K3 is right after the 8.215mHz mixer, so at that point, it has a very wide bandwidth. The K3 filtering is after that IF takeoff point, so any filtering in the K3 will not affect that bandwidth. I don't know how much wider than 200kHz the IF takeoff might be. 200kHz is a substantial portion of any band. 73, Don W3FPR On 12/25/2017 12:17 PM, Jim Miller wrote: > The P3 displays a maximum of 200khz. Is that the maximum useful K3 IF > bandwidth or is it wider? > > 73 > > Jim ab3cv > __ > 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 donw...@embarqmail.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 tom...@videotron.ca __ 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] K3s IF bandwidth?
Thanks all! Jim ab3cv On Dec 25, 2017, at 12:37 PM, tomb18 wrote: Hi If you connect an sdrplay to the if output you can see over 2mhz bandwidth. 73 Tom Sent from my Samsung Galaxy smartphone. Original message From: Don Wilhelm Date: 2017-12-25 12:31 PM (GMT-05:00) To: Jim Miller , Elecraft@mailman.qth.net Subject: Re: [Elecraft] K3s IF bandwidth? Jim, The IF takeoff point in the K3 is right after the 8.215mHz mixer, so at that point, it has a very wide bandwidth. The K3 filtering is after that IF takeoff point, so any filtering in the K3 will not affect that bandwidth. I don't know how much wider than 200kHz the IF takeoff might be. 200kHz is a substantial portion of any band. 73, Don W3FPR On 12/25/2017 12:17 PM, Jim Miller wrote: > The P3 displays a maximum of 200khz. Is that the maximum useful K3 IF > bandwidth or is it wider? > > 73 > > Jim ab3cv > __ > 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 donw...@embarqmail.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 tom...@videotron.ca __ 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] K3s IF bandwidth?
Hi all and Merry Christmas, Well, the ham band specific HF filters are probably significantly narrower than 2MHz, tailored to the actual width of the band in question. I don't know if there is a way to tell the K3(S) to use a general coverage filter, if installed, even if inside a ham band. That would circumvent the problem. AB2TC - Knut tomb18 wrote > HiIf you connect an sdrplay to the if output you can see over 2mhz > bandwidth. 73 Tom > -- Sent from: http://elecraft.365791.n2.nabble.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] K3s IF bandwidth?
I could be wrong, but I thought they were low pass filters, not band pass. I think each filter even covers more than one band if they are within an octave or something like that. Somebody please correct me if I'm wrong. Dave AB7E On 12/25/2017 11:10 AM, ab2tc wrote: Hi all and Merry Christmas, Well, the ham band specific HF filters are probably significantly narrower than 2MHz, tailored to the actual width of the band in question. I don't know if there is a way to tell the K3(S) to use a general coverage filter, if installed, even if inside a ham band. That would circumvent the problem. AB2TC - Knut tomb18 wrote HiIf you connect an sdrplay to the if output you can see over 2mhz bandwidth. 73 Tom -- Sent from: http://elecraft.365791.n2.nabble.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 xda...@cis-broadband.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] K3s IF bandwidth?
Hi again, Heavens no, they are definitely bandpass filters, tailored to each ham band. I think I have seen a plot of their responses somewhere, but can't remember where. Each filter covers 2 bands with a relay to choose which one of the two. AB2TC - Knut David Gilbert wrote > I could be wrong, but I thought they were low pass filters, not band > pass. I think each filter even covers more than one band if they are > within an octave or something like that. > > Somebody please correct me if I'm wrong. > > Dave AB7E -- Sent from: http://elecraft.365791.n2.nabble.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] K3s IF bandwidth?
Yes, they are bandpass filters, to reject the image 16 MHz from the desired frequency, among other things. There are, of course, also low pass filters, to reduce transmitted harmonics. 73, Scott K9MA On 12/25/2017 16:27, ab2tc wrote: Hi again, Heavens no, they are definitely bandpass filters, tailored to each ham band. I think I have seen a plot of their responses somewhere, but can't remember where. Each filter covers 2 bands with a relay to choose which one of the two. AB2TC - Knut David Gilbert wrote I could be wrong, but I thought they were low pass filters, not band pass. I think each filter even covers more than one band if they are within an octave or something like that. Somebody please correct me if I'm wrong. Dave AB7E -- Scott K9MA k...@sdellington.us __ 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] K3s IF bandwidth?
It's as wide as the bandwidth of the BPF ahead of the 1st mixer. There are several BPF's for the various bands and their BW no doubt varies, but is likely much larger than 200 KHz. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 12/25/2017 9:17 AM, Jim Miller wrote: The P3 displays a maximum of 200khz. Is that the maximum useful K3 IF bandwidth or is it wider? 73 Jim ab3cv __ 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 k6...@foothill.net -- This message has been scanned by E.F.A. Project and is believed to be clean. __ 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
