Elecraft

sensitvity k4

Classic

List

Threaded

12 messages Options

RICHH

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:[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]

Don Wilhelm

Re: 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:[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]

Joe Subich, W4TV-4

Re: 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:[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]

Edward H Russell

Re: 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: [hidden email] <[hidden email]> On Behalf Of Joe Subich, W4TV
Sent: Monday, October 12, 2020 8:50 PM
To: [hidden email]
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:[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]

______________________________________________________________
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]

wayne burdick

Re: sensitvity k4

Administrator

In reply to this post by RICHH

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 <[hidden email]> 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:[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]

RICHH

Re: 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 <[hidden email]> 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 <[hidden email]>
> wrote:
> >
> > Anyone have an idea which version of the k4 would have the most
> sensitivity
> > for weak signals?
> > Thanks Richard
>
>
>

Robin Szemeti

Re: 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 <[hidden email]> 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 <[hidden email]> 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 <[hidden email]>
> > 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:[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]
>

K9FD

Re: 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 <[hidden email]> 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 <[hidden email]> 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 <[hidden email]>
>>> 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:[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]

wayne burdick

Re: sensitvity k4

Administrator

Wrong list, just maybe?

> On Oct 13, 2020, at 5:20 PM, K9FD <[hidden email]> 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 <[hidden email]> wrote:

Eric Swartz - WA6HHQ

Re: sensitvity k4

Administrator

In reply to this post by K9FD

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...
<remaining text of post deleted>
______________________________________________________________
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]

Eric Swartz - WA6HHQ

Re: sensitvity k4

Administrator

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 <[hidden email]> 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...
> <remaining text of post deleted>

Ted Roycraft-3

Re: sensitvity k4

In reply to this post by K9FD

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 <[hidden email]>
>> 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 <[hidden email]>
>>> 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 <[hidden email]>
>>>> 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:[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]
>
> ______________________________________________________________
> 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]