[Elecraft] sensitvity k4
Anyone have an idea which version of the k4 would have the most sensitivity for weak signals? Thanks Richard __ 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] sensitvity k4
Richard, I don't know the answer, but when you get receiver sensitivities better the -135dBm, the exact sensitivity numbers do not mean much unless you have an extremely quiet location. In general, the local noise will mask anything lower than -135dBm. I expect all K4s models to have better then -135dBm sensitivity. 73, Don W3FPR On 10/12/2020 7:52 PM, Richard Donner wrote: Anyone have an idea which version of the k4 would have the most sensitivity for weak signals? Thanks Richard __ 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] sensitvity k4
On 2020-10-12 8:22 PM, Don Wilhelm wrote: > In general, the local noise will mask anything lower than -135dBm. That may be true for the lower HF bands. However, on 6 meters or when using the K4 as an IF for VHF transverters and/or EME the noise level will be as much as 20 dB less than -135 dBm. That may even be true with directional antennas above 20 MHz at suburban locations. 73, ... Joe, W4TV On 2020-10-12 8:22 PM, Don Wilhelm wrote: Richard, I don't know the answer, but when you get receiver sensitivities better the -135dBm, the exact sensitivity numbers do not mean much unless you have an extremely quiet location. In general, the local noise will mask anything lower than -135dBm. I expect all K4s models to have better then -135dBm sensitivity. 73, Don W3FPR On 10/12/2020 7:52 PM, Richard Donner wrote: Anyone have an idea which version of the k4 would have the most sensitivity for weak signals? Thanks Richard __ 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 li...@subich.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] sensitvity k4
>From my experience with other SDR radios, the individual receivers in the K4D >won't give it a sensitivity advantage unless they are used in diversity mode. >In that case the K4D will have a clear advantage. ED / W2RF -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Joe Subich, W4TV Sent: Monday, October 12, 2020 8:50 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] sensitvity k4 On 2020-10-12 8:22 PM, Don Wilhelm wrote: > In general, the local noise will mask anything lower than -135dBm. That may be true for the lower HF bands. However, on 6 meters or when using the K4 as an IF for VHF transverters and/or EME the noise level will be as much as 20 dB less than -135 dBm. That may even be true with directional antennas above 20 MHz at suburban locations. 73, ... Joe, W4TV On 2020-10-12 8:22 PM, Don Wilhelm wrote: > Richard, > > I don't know the answer, but when you get receiver sensitivities > better the -135dBm, the exact sensitivity numbers do not mean much > unless you have an extremely quiet location. > In general, the local noise will mask anything lower than -135dBm. > I expect all K4s models to have better then -135dBm sensitivity. > > 73, > Don W3FPR > > On 10/12/2020 7:52 PM, Richard Donner wrote: >> Anyone have an idea which version of the k4 would have the most >> sensitivity for weak signals? >> Thanks Richard > __ > 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 > li...@subich.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 e...@qrv.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] sensitvity k4
Hi Richard, All K4 models utilize the same front-end circuitry (preamps, filters, etc.), so all will have virtually identical sensitivity for a given gain setting. These in turn will be similar to the K3/K3S. 73, Wayne N6KR > On Oct 12, 2020, at 4:52 PM, Richard Donner wrote: > > Anyone have an idea which version of the k4 would have the most sensitivity > for weak signals? > Thanks Richard __ 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] sensitvity k4
Wayne, Thank you. My main issue here is weak signals.There are no ham stations near me to cause interference. A good antenna is what I ought to have but that is not happening. Richard Richard Donner On Tue, Oct 13, 2020 at 12:56 PM Wayne Burdick wrote: > Hi Richard, > > All K4 models utilize the same front-end circuitry (preamps, filters, > etc.), so all will have virtually identical sensitivity for a given gain > setting. These in turn will be similar to the K3/K3S. > > 73, > Wayne > N6KR > > > On Oct 12, 2020, at 4:52 PM, Richard Donner > wrote: > > > > Anyone have an idea which version of the k4 would have the most > sensitivity > > for weak signals? > > Thanks Richard > > > __ 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] sensitvity k4
Remember the noise/gain equation and how what determines sensitivity is ultimately a systems noise figure. ... when used with a transverter or an EME preamp the noise figure of the system will essentially be set by the noise figure of the first stage. Subsequent stages have much less effect on the noise figure, as the noise contribution is divided by the gain of the preceding stage. On Tue, 13 Oct 2020 at 21:47, Richard Donner wrote: > Wayne, > Thank you. > My main issue here is weak signals.There are no > ham stations near me to cause interference. > > A good antenna is what I ought to have but that is not happening. > Richard > Richard Donner > > On Tue, Oct 13, 2020 at 12:56 PM Wayne Burdick wrote: > > > Hi Richard, > > > > All K4 models utilize the same front-end circuitry (preamps, filters, > > etc.), so all will have virtually identical sensitivity for a given gain > > setting. These in turn will be similar to the K3/K3S. > > > > 73, > > Wayne > > N6KR > > > > > On Oct 12, 2020, at 4:52 PM, Richard Donner > > wrote: > > > > > > Anyone have an idea which version of the k4 would have the most > > sensitivity > > > for weak signals? > > > Thanks Richard > > > > > > > __ > 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 ro...@redpoint.org.uk > __ 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] sensitvity k4
Boy it fits the person asking the question. There are reams of files and court filings against Hir-onono for harassment when she ran or owned a company out here many moons back, she a dike as all the complaints were women. Of course everything was hidden and charges dropped a she was the Dems toy and upcoming politician. Probably knew Obozo well when he was here with the commie party. I think if you looked in her purse you would find her commie card. She is just the mouth of the party, they know shes to dumb for anything else, and just feed her the papers and what to say on demand. Remember the noise/gain equation and how what determines sensitivity is ultimately a systems noise figure. ... when used with a transverter or an EME preamp the noise figure of the system will essentially be set by the noise figure of the first stage. Subsequent stages have much less effect on the noise figure, as the noise contribution is divided by the gain of the preceding stage. On Tue, 13 Oct 2020 at 21:47, Richard Donner wrote: Wayne, Thank you. My main issue here is weak signals.There are no ham stations near me to cause interference. A good antenna is what I ought to have but that is not happening. Richard Richard Donner On Tue, Oct 13, 2020 at 12:56 PM Wayne Burdick wrote: Hi Richard, All K4 models utilize the same front-end circuitry (preamps, filters, etc.), so all will have virtually identical sensitivity for a given gain setting. These in turn will be similar to the K3/K3S. 73, Wayne N6KR On Oct 12, 2020, at 4:52 PM, Richard Donner wrote: Anyone have an idea which version of the k4 would have the most sensitivity for weak signals? Thanks Richard __ 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 ro...@redpoint.org.uk __ 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 merv.k...@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] sensitvity k4
Wrong list, just maybe? > On Oct 13, 2020, at 5:20 PM, K9FD wrote: > > Boy it fits the person asking the question. > There are reams of files and court filings against Hir-onono for harassment > when she ran or owned a company out here many moons back, she a dike > as all the complaints were women. Of course everything was hidden and > charges dropped a she was the Dems toy and upcoming politician. > Probably knew Obozo well when he was here with the commie party. > I think if you looked in her purse you would find her commie card. > > She is just the mouth of the party, they know shes to dumb for anything > else, and just feed her the papers and what to say on demand. > > >> Remember the noise/gain equation and how what determines sensitivity is >> ultimately a systems noise figure. ... when used with a transverter or an >> EME preamp the noise figure of the system will essentially be set by the >> noise figure of the first stage. Subsequent stages have much less effect >> on the noise figure, as the noise contribution is divided by the gain of >> the preceding stage. >> >> On Tue, 13 Oct 2020 at 21:47, Richard Donner wrote: __ 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] sensitvity k4
Folks - The post below is in violation of the Elecraft list rules and is totally inappropriate. Political and personal attacks are not allowed here. Period. Also, please do not reply to the posting person or comment further on the post. Please, let's keep this list amateur radio related and polite. 73, Eric List moderator elecraft.com _..._ > On Oct 13, 2020, at 5:22 PM, merv wrote: > > Boy it fits the person asking the question. > There are reams of files and court filings against... __ 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] sensitvity k4
We have also been apologetically notified by the poster that the email noted below was unintentionally sent in error to the Elecraft list. We gratefully accept their apology. This is a reminder to always be careful to check your email To: and cc: lists before hitting 'send'. Also note that since the list emails your postings directly to thousands of subscribers, there is no way for us to take them back or remove them. Also aggregators like Nabble independently gather list postings for their webpage and we do not have control over their operation. 73, Eric Moderator etc. elecraft.com _..._ > On Oct 13, 2020, at 5:44 PM, Eric Swartz wrote: > > Folks - The post below is in violation of the Elecraft list rules and is > totally inappropriate. > > Political and personal attacks are not allowed here. Period. > > Also, please do not reply to the posting person or comment further on the > post. > > Please, let's keep this list amateur radio related and polite. > > 73, > Eric > List moderator > elecraft.com > _..._ > >> On Oct 13, 2020, at 5:22 PM, merv wrote: >> Boy it fits the person asking the question. >> There are reams of files and court filings against... > __ 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] sensitvity k4
Well K9FD, thank you for letting us know "what" you are. On 10/13/2020 20:20, K9FD wrote: Boy it fits the person asking the question. There are reams of files and court filings against Hir-onono for harassment when she ran or owned a company out here many moons back, she a dike as all the complaints were women. Of course everything was hidden and charges dropped a she was the Dems toy and upcoming politician. Probably knew Obozo well when he was here with the commie party. I think if you looked in her purse you would find her commie card. She is just the mouth of the party, they know shes to dumb for anything else, and just feed her the papers and what to say on demand. Remember the noise/gain equation and how what determines sensitivity is ultimately a systems noise figure. ... when used with a transverter or an EME preamp the noise figure of the system will essentially be set by the noise figure of the first stage. Subsequent stages have much less effect on the noise figure, as the noise contribution is divided by the gain of the preceding stage. On Tue, 13 Oct 2020 at 21:47, Richard Donner wrote: Wayne, Thank you. My main issue here is weak signals. There are no ham stations near me to cause interference. A good antenna is what I ought to have but that is not happening. Richard Richard Donner On Tue, Oct 13, 2020 at 12:56 PM Wayne Burdick wrote: Hi Richard, All K4 models utilize the same front-end circuitry (preamps, filters, etc.), so all will have virtually identical sensitivity for a given gain setting. These in turn will be similar to the K3/K3S. 73, Wayne N6KR On Oct 12, 2020, at 4:52 PM, Richard Donner wrote: Anyone have an idea which version of the k4 would have the most sensitivity for weak signals? Thanks Richard __ 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 ro...@redpoint.org.uk __ 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 merv.k...@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 ted.roycr...@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
