KBPF3 upgrade kit and instructions [Corrected]
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KBPF3 upgrade kit and instructions [Corrected]
 
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The correct instruction sheet is now available on the order page for the KBPF3 mod kit. You may need to hit "refresh" on your browser to see the corrected link.
73, Wayne N6KR * * * The long-promised KBPF3 modification kit is now available. It applies to the KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 or K3S to receive signals in the 100-500 kHz range with good sensitivity. For full details on the mod kit, see: http://www.elecraft.com/order_form_parts.htm#K3%20Parts Also see below for an excerpt from my original posting about signals in the 100-500 kHz range. * * * In honor of the FCC's proposed "2200 meter" allocation (137 kHz), we decided to see if we could improve the K3's receive sensitivity in the 100-500 kHz range. This extended coverage is made possible by the new synth (KSYN3A). After a lot of digging, we discovered the cause of the wide-band low-frequency noise. We also found a way to shift the passband of the KBPF3 lower. With a couple of simple modifications, the MDS (minimum discernible signal) can be improved by about 25 dB at the low end (100 kHz). Here are some test results (preamp off, 400-Hz bandwidth): 137 kHz -114 dBm FCC's proposed 2200 meter band 160 kHz -117 dBm low end of the "Low-Fer" band 250 kHz -126 dBm test frequency in the long-wave beacon band 472 kHz -133 dBm 630 meter experimental band This represents an improvement throughout the range, but especially at the low end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band noise in this range. Another indication of how well the mods work: With no antenna connoted, the K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the no-antenna S-meter reading could be as high as S7 due to the noise source we've now identified (a voltage regulator). (By the way, this regulator noise had no impact on frequencies about about 500 kHz.) ... ______________________________________________________________ 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 Message delivered to [hidden email] |
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Hmmm...
Before I order (and I am anxious to order something), I need to sit down and check several links on the Elecraft site to figure out what I have and what I can order to upgrade. And check the forum as well. While the Elecraft folks are just hanging out looking for something to do :), I long for an interactive link on the Elecraft site that I can just enter my K3 serial number into and it displays all the upgrades that I could benefit from and why.
Chuck, KE9UW
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Re: KBPF3 upgrade kit and instructions [Corrected]
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In reply to this post by wayne burdick
Ah, much better, Wayne: It now has all the pages
referred to in the errata. BTW, is the errata still pertinent or is it OBE? 73, Phil W7OX On 6/25/15 9:13 AM, Wayne Burdick wrote: > The correct instruction sheet is now available on the order page for the KBPF3 mod kit. You may need to hit "refresh" on your browser to see the corrected link. > > 73, > Wayne > N6KR > > > > * * * > > The long-promised KBPF3 modification kit is now available. It applies to the KBPF3, K3 RF board, and optionally to the KRX3 sub receiver. It allows the K3 or K3S to receive signals in the 100-500 kHz range with good sensitivity. > > For full details on the mod kit, see: > > http://www.elecraft.com/order_form_parts.htm#K3%20Parts > > Also see below for an excerpt from my original posting about signals in the 100-500 kHz range. > > * * * > > In honor of the FCC's proposed "2200 meter" allocation (137 kHz), we decided to see if we could improve the K3's receive sensitivity in the 100-500 kHz range. This extended coverage is made possible by the new synth (KSYN3A). > > After a lot of digging, we discovered the cause of the wide-band low-frequency noise. We also found a way to shift the passband of the KBPF3 lower. > > With a couple of simple modifications, the MDS (minimum discernible signal) can be improved by about 25 dB at the low end (100 kHz). Here are some test results (preamp off, 400-Hz bandwidth): > > 137 kHz -114 dBm FCC's proposed 2200 meter band > 160 kHz -117 dBm low end of the "Low-Fer" band > 250 kHz -126 dBm test frequency in the long-wave beacon band > 472 kHz -133 dBm 630 meter experimental band > > This represents an improvement throughout the range, but especially at the low end. I believe -114 dBm MDS should suffice at 137 kHz, given the high band noise in this range. > > Another indication of how well the mods work: With no antenna connoted, the K3's S-meter now just barely flickers (S1) at 100 kHz. Without the mods, the no-antenna S-meter reading could be as high as S7 due to the noise source we've now identified (a voltage regulator). (By the way, this regulator noise had no impact on frequencies about about 500 kHz.) ______________________________________________________________ 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 Message delivered to [hidden email] |
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In reply to this post by ke9uw
Amen. I agree. I also would like to be able to put serial number in and see what I need or can upgrade
Sent from my iPhone > On Jun 25, 2015, at 1:51 PM, ke9uw <[hidden email]> wrote: > > Hmmm... > Before I order (and I am anxious to order something), I need to sit down and > check several links on the Elecraft site to figure out what I have and what > I can order to upgrade. And check the forum as well. > While the Elecraft folks are just hanging out looking for something to do > :), I long for an interactive link on the Elecraft site that I can just > enter my K3 serial number into and it displays all the upgrades that I could > benefit from and why. > > > > ----- > Chuck, KE9UW > -- > View this message in context: http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604297.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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 > Message delivered to [hidden email] 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 Message delivered to [hidden email] |
Re: KBPF3 upgrade kit and instructions [Corrected]
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Serial number by itself doesn't by itself reliably indicate what is needed
as prior mods and options already installed bear on what is needed or not. No way out of brainwork prior to order. 73, Guy K2AV On Thursday, June 25, 2015, Doug <[hidden email]> wrote: > Amen. I agree. I also would like to be able to put serial number in and > see what I need or can upgrade > > Sent from my iPhone > > > On Jun 25, 2015, at 1:51 PM, ke9uw <[hidden email] <javascript:;>> > wrote: > > > > Hmmm... > > Before I order (and I am anxious to order something), I need to sit down > and > > check several links on the Elecraft site to figure out what I have and > what > > I can order to upgrade. And check the forum as well. > > While the Elecraft folks are just hanging out looking for something to do > > :), I long for an interactive link on the Elecraft site that I can just > > enter my K3 serial number into and it displays all the upgrades that I > could > > benefit from and why. > > > > > > > > ----- > > Chuck, KE9UW > > -- > > View this message in context: > http://elecraft.365791.n2.nabble.com/KBPF3-upgrade-kit-and-instructions-Corrected-tp7604292p7604297.html > > Sent from the Elecraft mailing list archive at Nabble.com. > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[hidden email] <javascript:;> > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [hidden email] <javascript:;> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] <javascript:;> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] <javascript:;> > -- Sent via Gmail Mobile on my iPhone ______________________________________________________________ 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 Message delivered to [hidden email] |
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Yes, but in my case, I remember any mods already done since my K3 was built.
Chuck, KE9UW
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Re: KBPF3 upgrade kit and instructions [Corrected]
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Administrator
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In reply to this post by Phil Wheeler-2
Hi Phil,
The errata were assimilated (er...incorporated :) 73, Wayne N6KR On Jun 25, 2015, at 10:58 AM, Phil Wheeler <[hidden email]> wrote: > Ah, much better, Wayne: It now has all the pages referred to in the errata. BTW, is the errata still pertinent or is it OBE? > > 73, Phil W7OX > > On 6/25/15 9:13 AM, Wayne Burdick wrote: >> The correct instruction sheet is now available on the order page for the KBPF3 mod kit. You may need to hit "refresh" on your browser to see the corrected link. >> >> 73, >> Wayne >> N6KR ______________________________________________________________ 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 Message delivered to [hidden email] |
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And Jean-Luk, where is 7 of 9?
N2TK, Tony -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Wayne Burdick Sent: Thursday, June 25, 2015 5:20 PM To: Phil Wheeler Cc: [hidden email] Subject: Re: [Elecraft] KBPF3 upgrade kit and instructions [Corrected] Hi Phil, The errata were assimilated (er...incorporated :) 73, Wayne N6KR On Jun 25, 2015, at 10:58 AM, Phil Wheeler <[hidden email]> wrote: > Ah, much better, Wayne: It now has all the pages referred to in the errata. BTW, is the errata still pertinent or is it OBE? > > 73, Phil W7OX > > On 6/25/15 9:13 AM, Wayne Burdick wrote: >> The correct instruction sheet is now available on the order page for the KBPF3 mod kit. You may need to hit "refresh" on your browser to see the corrected link. >> >> 73, >> Wayne >> N6KR ______________________________________________________________ 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 Message delivered to [hidden email] ______________________________________________________________ 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 Message delivered to [hidden email] |
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