Elecraft

odds and ends...

Classic

List

Threaded

38 messages Options

va3bxg

Re: odds and ends...

According to previous posts from wayne, elecraft is in the process of putting a set of cables together to be sold on the site. I have no idea which type of cables etc. But that would make life easier for some people

a 'kosher ham'

Robert

-----Original Message-----
From: "Jeff Herr" <[hidden email]>
Sender: [hidden email]
Date: Sun, 19 Aug 2012 09:11:41
To: 'Jeff Herr'<[hidden email]>; <[hidden email]>
Subject: Re: [Elecraft] odds and ends...

Per the manual Iit looks like I would need one of these

A cable with a 2.5 mm (3/32") plug on one end and
a plug that matches your sound card input on the
other end (typically 3.5 mm [1/8"] stereo) is
required.

If I want to see a panadapter display on my laptop.

Where do I get it?

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Jeff Herr
Sent: Sunday, August 19, 2012 7:57 AM
To: [hidden email]
Subject: [Elecraft] odds and ends...

I am waiting for my KX3 as a number of you are.

When I get it I want to hook it up to the laptop for wspr and other stuff.

What will I need in the of cables?

WW6L

Jeff Herr

4636 Kelton Way

Sacramento,CA 95838

916.925.6089

[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

______________________________________________________________
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
______________________________________________________________
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

Keith Heimbold

Re: odds and ends...

Looking forward to that. Accessories and cables and any ancillaries for the KX3. Looking forward to their launch.

Keith
AG6AZ

Sent from my iPhone please excuse typos

On Aug 19, 2012, at 10:13 PM, [hidden email] wrote:

> According to previous posts from wayne, elecraft is in the process of putting a set of cables together to be sold on the site. I have no idea which type of cables etc. But that would make life easier for some people
>
>
> a 'kosher ham'
>
> Robert
>
> -----Original Message-----
> From: "Jeff Herr" <[hidden email]>
> Sender: [hidden email]
> Date: Sun, 19 Aug 2012 09:11:41
> To: 'Jeff Herr'<[hidden email]>; <[hidden email]>
> Subject: Re: [Elecraft] odds and ends...
>
> Per the manual Iit looks like I would need one of these
>
> A cable with a 2.5 mm (3/32") plug on one end and
> a plug that matches your sound card input on the
> other end (typically 3.5 mm [1/8"] stereo) is
> required.
>
> If I want to see a panadapter display on my laptop.
>
> Where do I get it?
>
>
>
>
>
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Jeff Herr
> Sent: Sunday, August 19, 2012 7:57 AM
> To: [hidden email]
> Subject: [Elecraft] odds and ends...
>
> I am waiting for my KX3 as a number of you are.
>
>
>
> When I get it I want to hook it up to the laptop for wspr and other stuff.
>
>
>
> What will I need in the of cables?
>
>
>
> WW6L
>
>
>
>
>
> Jeff Herr
>
> 4636 Kelton Way
>
> Sacramento,CA 95838
>
> 916.925.6089
>
> [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
>
> ______________________________________________________________
> 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
> ______________________________________________________________
> 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

Jim Brown-10

Re: odds and ends...

In reply to this post by Jeff Herr

On 8/19/2012 7:54 PM, Jeff Herr wrote:
> Can someone explain why an external interface product, signalink, rig
> blaster, etc is needed between a kx3 and a laptop?

It depends entirely on WHAT you want to accomplish with your laptop, and
HOW GOOD you want it to be. Others have covered the spectrum display
issues, so I won't repeat that.

Another thing we do on a computer, laptop or otherwise, is generate and
decode digital signals. In general, the generic sound cards built into
computers aren't that wonderful, and a DECENT sound card will have much
better A/D linearity at the lower end of its dynamic range, as well as
less analog audio distortion. The result is usually greatly improve the
decoding of digital signals.

In careful testing, I found that, on average, even a carefully selected
el-cheapo USB sound card DOUBLED the number of JT65A decodes that I got
on each pass compared to the stock sound card, and let me copy signals
much deeper into the noise. I also saw improved performance on RTTY.

I recommend the low cost Numark and the low cost Tascam, about $30 and
$70 respectively at B&H Photo. Both decode equally well, but the Tascam
is more adjustable and flexible to accept a wider range of input and
output levels.

73, Jim K9YC
______________________________________________________________
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

Bill Frantz

Re: odds and ends...

In reply to this post by Joe Subich, W4TV-4

Using a SignaLink USB interface, I often see cocoaModem
reporting input overload from strong signals on 20 meters with
the noise barely visible on the waterfall. This occurs with both
the K3 and the Small Wonder Labs PSK-20 driving the system. (The
Icom 706 MK2G generates a lot more noise.) I reduce the gain on
the SignaLink, or with the K3 on the RF gain, but that pushes
weak signals too low to decode.

I am willing to accept that the SignaLink isn't a good sound
card, but need evidence/alternatives.

Cheers - Bill, AE6JV

On 8/20/12 at 22:08, [hidden email] (Joe Subich, W4TV) wrote:

>With real receivers you probably will never notice the difference in
>dynamic range between a 16 and 24 bit sound card. The receiver AGC
>- even only modest AGC - will keep the dynamic range presented to the
>sound card well within anything the 16 bit sound card can handle.
>That is *unless* the 16 bit card is poorly designed with internal
>noise that wastes a significant part of the 16 bit range.
>
>Even without AGC, the range between "background noise" (the noise
>floor of the demodulation process including sky noise, thermal
>noise in the IF, etc.) and the clipping point of the audio output
>can be considerably less than 90 dB in "real" receivers. Audio
>output levels tend to range from around 10 mV with "no signal" to
>just under 5V P-P (2V RMS) at best ... that's less than 50 dB.
>Even if one assumes the software can decode a 1 mV signal in the
>10 mV nose floor, the resulting dynamic range is still much less
>than 90 dB provided by a properly designed 16 bit sound card and
>unless the 24 bit soundcard uses other than the typical 5V power
>supply, its real performance will be limited by the same 5V P-P
>audio levels!
>
>Taken a step further - if the receiver produces a 1 mV noise floor
>with 24V P-P output (+/- 12V supplies), that's *still* less than
>90 dB of range.

N8LP

Re: odds and ends...

In reply to this post by Jeff Herr

Hi Don. I just received the digest version of your post. I don't recall
ever having said that a 48kHz sampling rate will produce a 96kHz display
span. All my postings and web site info states that the span will be
roughly equal to the sampling rate (minus a tiny amount due to the
rolloff of the anti-aliasing filter in the sound card). I saw Joe's
comment copied in the same digest message, and it is not correct. I'm
sure it was just a slip of the fingers. The confusion comes in that the
displayed span is roughly equal to twice the sound card bandwidth... not
twice the sound card sampling rate. The bandwidth of the card, of
course, is roughly half the sampling rate if it is properly implemented.

73,
Larry N8LP

On 8/19/2012 11:51 PM, [hidden email] wrote:

> From:[hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Sunday, August 19, 2012 9:54 PM
> To: WB4JFI
> Cc:[hidden email]
> Subject: Re: [Elecraft] odds and ends...
>
> I don't know the advertized numbers, but Mr. Nyquist aside, there is a
> reason that two independent experts with panadapter displays (Joe Subich
> W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a
> 48 kHz rate will produce a 96 kHz span on the pan display.
>
> I do not doubt Nyquist, but I think the treatment of the numbers are a bit
> different (factor of 2) Could it be due to the two channels? I really don't
> know the answers and do not have the energy to investigate such things
> anymore, I just choose to trust the experts who deal with this I/Q stuff on
> a daily basis. I guess my scientific curiosity has declined with advancing
> years - it is no longer enjoyable to argue on the basis of observations vs.
> theory to sort out the differences - that was "fun mind games" many years
> ago. but today it is no longer a challenge.
>
> 73,
> Don W3FPR

Nr4c

Re: odds and ends...

In reply to this post by Jim Rhodes-2

Note that SignalLink is also MONO!

...bc nr4c

Sent from my Verizon Wireless Droid

-----Original message-----
From: Jim Rhodes <[hidden email]>
To: Jeff Herr <[hidden email]>
Cc: [hidden email]
Sent: Mon, Aug 20, 2012 03:16:52 GMT+00:00
Subject: Re: [Elecraft] odds and ends...

Many (most?) laptop sound inputs are mono inputs and you need 2 channels
for IQ work. My old Gateway laptop switches depending on what is plugged
into it but my newer Samsung only does mono.

Jim K0XU Sent from my Xoom tablet
On Aug 19, 2012 9:53 PM, "Jeff Herr" <[hidden email]> wrote:

> Can someone explain why an external interface product, signalink, rig
> blaster, etc is needed between a kx3 and a laptop?
>
>
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of KQ8M
> Sent: Sunday, August 19, 2012 7:12 PM
> To: [hidden email]; 'WB4JFI'
> Cc: [hidden email]
> Subject: Re: [Elecraft] odds and ends...
>
> Not really following this thread but I must have some really bad cards

from

> creative, asus and m-audio as my 96KHz cards only get 96Khz total, 48KHz
> either side of center and my 192KHz cards only get 192KHz total, 96KHz
> either side of center using my K3, LP-Pan and PowerSDR. Or with any of my
> SDR receivers and CWSkimmer. Or with any SDR receivers I build and test
> with
> Rocky, HDSDR, WinSDR etc. I know of no known low cost sound card that will
> provide 384KHz of total audio bandwidth.
>
> 73,
> Tim Herrick, KQ8M
> Charter Member North Coast Contesters
> [hidden email]
>
> AR-Cluster V6 kq8m.no-ip.org
> User Ports: 23, 7373 with local skimmer, 7374 without local skimmer

Server

> Ports: V6 3607, V4 Active 3605, V4 Passive 3606
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Sunday, August 19, 2012 9:54 PM
> To: WB4JFI
> Cc: [hidden email]
> Subject: Re: [Elecraft] odds and ends...
>
> I don't know the advertized numbers, but Mr. Nyquist aside, there is a
> reason that two independent experts with panadapter displays (Joe Subich
> W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a
> 48 kHz rate will produce a 96 kHz span on the pan display.
>
> I do not doubt Nyquist, but I think the treatment of the numbers are a bit
> different (factor of 2) Could it be due to the two channels? I really
> don't
> know the answers and do not have the energy to investigate such things
> anymore, I just choose to trust the experts who deal with this I/Q stuff

on
> a daily basis. I guess my scientific curiosity has declined with
advancing
> years - it is no longer enjoyable to argue on the basis of observations
vs.

> theory to sort out the differences - that was "fun mind games" many years
> ago. but today it is no longer a challenge.
>
> 73,
> Don W3FPR
>
> On 8/19/2012 5:45 PM, WB4JFI wrote:
> > Mr Nyquist would be happily surprised at that. With I&Q samples at
> > 48kS/s each, you get a maximum of 48kHz, or one-half the total
> bandwidth. Not 48k+48k.
> >
> > So, with a 48k sample rate, you will get plus and minus 24k from center.
> >
> > Sent from tfox iPad
> >
> > On Aug 19, 2012, at 4:33 PM, "Joe Subich, W4TV" <[hidden email]>
> wrote:
> >
> >>> The sound card's maximum sampling rate will determine how wide your
> >>> panadapter display can be (in kHz); for example, a sound card
> >>> capable of sampling at 48 kHz can display slightly less than 48 kHz
> >>> of spectrum. If you want a wider display, you will have to ensure
> >>> that your sound card can sample at higher rates.
> >> A sound card capable of 48 KHz sample rate can display slightly less
> >> than 96 KHz. With I/Q inputs and 48 KHz sampling you get +/- 48 KHz.
> >>
> >> 73,
> >>
> >> ... Joe, W4TV
> >>
> >> On 8/19/2012 4:20 PM, Richard Ferch wrote:
> >>> Jeff,
> >>>
> >>> In addition to the cable, you will also need to be sure that your
> >>> laptop's sound card accepts stereo input. Panadapter software
> >>> requires stereo input (I and Q channels). Some laptop input jacks
> >>> will only accept mono signals, even though the laptop's sound card
> >>> itself is stereo. My newest laptop, for example, has a TRRS jack for
> >>> the sound card with a single input line, two stereo output lines, and
> ground.
> >>> I have no way to get stereo input into this sound card. An older
> >>> laptop I have has separate input and output jacks, but while the
> >>> output jack is stereo, the input jack is mono. If your laptop is
> >>> like either of these, your only recourse may be to get an external
> >>> USB sound card with stereo inputs.
> >>>
> >>> The sound card's maximum sampling rate will determine how wide your
> >>> panadapter display can be (in kHz); for example, a sound card
> >>> capable of sampling at 48 kHz can display slightly less than 48 kHz
> >>> of spectrum. If you want a wider display, you will have to ensure
> >>> that your sound card can sample at higher rates.
> >>>
> >>> Note that if you need to use an external (e.g. USB) sound card, it
> >>> may or may not have 3.5mm inputs. For example, I have one with dual
> >>> RCA phono jacks for its line inputs. With one of these cards, you
> >>> would need to go from 2.5mm stereo for the KX3's RX I/Q jack to two
> >>> separate RCA phono plugs for the sound card's input.
> >>>
> >>> I don't know whether Radio Shack has the specific cable you would
> >>> need, but I am sure that they have cables and adapters that could be
> >>> combined to achieve the desired result.
> >>>
> >>> 73,
> >>> Rich VE3KI
> >>>
> >>>
> >>> WW6L wrote:
> >>>
> >>>> Per the manual Iit looks like I would need one of these
> >>>>
> >>>> A cable with a 2.5 mm (3/32") plug on one end and a plug that
> >>>> matches your sound card input on the other end (typically 3.5 mm
> >>>> [1/8"] stereo) is required.
> >>>>
> >>>> If I want to see a panadapter display on my laptop.
> >>>>
> >>>> Where do I get it?
> >>> ______________________________________________________________
> >>> 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
> >>>
> >> ______________________________________________________________
> >> 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
> > ______________________________________________________________
> > 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
> >
>
> ______________________________________________________________
> 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
>
>
>
> ______________________________________________________________
> 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
>
> ______________________________________________________________
> 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
>

______________________________________________________________
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

______________________________________________________________
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

Joe Subich, W4TV-4

Re: odds and ends...

In reply to this post by Bill Frantz

I don't know how Chen determines input overload - whether he's seeing
digital overrun in the data or measuring clipping in the audio input.
I suspect you are seeing the inevitable narrow range between hum/noise
on the audio output or the high noise floor of the particular sound
card and the limited signal handling capability (ca. 4.5V P-P) of a
single rail, 5V device.

However, unless a 24 bit soundcard is using +/- 12V supplies for the
analog input circuitry, there simply isn't 130 dB of usable range
between the noise floor and clipping levels. A properly designed 16
bit sound card will produce in excess of 90 dB dynamic range if the
designer takes care with the noise floor issues. That is sufficient
to handle signals from the receiver's noise floor to S9+20 dB with-
out AGC in most cases if the receiver itself linear. For signals
above that level it will take some kind of AGC simply to keep levels
within the linear range of the receiver's front end/mixers.

73,

... Joe, W4TV

On 8/20/2012 8:58 AM, Bill Frantz wrote:

> Using a SignaLink USB interface, I often see cocoaModem
> reporting input overload from strong signals on 20 meters with
> the noise barely visible on the waterfall. This occurs with both
> the K3 and the Small Wonder Labs PSK-20 driving the system. (The
> Icom 706 MK2G generates a lot more noise.) I reduce the gain on
> the SignaLink, or with the K3 on the RF gain, but that pushes
> weak signals too low to decode.
>
> I am willing to accept that the SignaLink isn't a good sound
> card, but need evidence/alternatives.
>
> Cheers - Bill, AE6JV
>
> On 8/20/12 at 22:08, [hidden email] (Joe Subich, W4TV) wrote:
>
>> With real receivers you probably will never notice the difference in
>> dynamic range between a 16 and 24 bit sound card. The receiver AGC
>> - even only modest AGC - will keep the dynamic range presented to the
>> sound card well within anything the 16 bit sound card can handle.
>> That is *unless* the 16 bit card is poorly designed with internal
>> noise that wastes a significant part of the 16 bit range.
>>
>> Even without AGC, the range between "background noise" (the noise
>> floor of the demodulation process including sky noise, thermal
>> noise in the IF, etc.) and the clipping point of the audio output
>> can be considerably less than 90 dB in "real" receivers. Audio
>> output levels tend to range from around 10 mV with "no signal" to
>> just under 5V P-P (2V RMS) at best ... that's less than 50 dB.
>> Even if one assumes the software can decode a 1 mV signal in the
>> 10 mV nose floor, the resulting dynamic range is still much less
>> than 90 dB provided by a properly designed 16 bit sound card and
>> unless the 24 bit soundcard uses other than the typical 5V power
>> supply, its real performance will be limited by the same 5V P-P
>> audio levels!
>>
>> Taken a step further - if the receiver produces a 1 mV noise floor
>> with 24V P-P output (+/- 12V supplies), that's *still* less than
>> 90 dB of range.
> -----------------------------------------------------------------------
> Bill Frantz | If the site is supported by | Periwinkle
> (408)356-8506 | ads, you are the product. | 16345
> Englewood Ave
> www.pwpconsult.com | | Los Gatos,
> CA 95032
>
> ______________________________________________________________
> 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
>

G3TCT

KX3 laptop question (was odds and ends...)

In reply to this post by Richard Ferch

If I want to use a small laptop with the KX3 to display the spectrum
when out portable, does anyone have a suggestion for such small device
with stereo input? Preferably without a separate sound card.

Graham

On 19:59, Richard Ferch wrote:
>
> I have no way to get stereo input into this sound card. An older
> laptop I have has separate input and output jacks, but while the
> output jack is stereo, the input jack is mono. If your laptop is like
> either of these, your only recourse may be to get an external USB
> sound card with stereo inputs.
>
______________________________________________________________
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

Jeff Herr

Re: odds and ends...

In reply to this post by Bill Frantz

Is signalink mono?

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Bill Frantz
Sent: Monday, August 20, 2012 5:58 AM
To: [hidden email]
Subject: Re: [Elecraft] odds and ends...

Using a SignaLink USB interface, I often see cocoaModem reporting input
overload from strong signals on 20 meters with the noise barely visible on
the waterfall. This occurs with both the K3 and the Small Wonder Labs PSK-20
driving the system. (The Icom 706 MK2G generates a lot more noise.) I reduce
the gain on the SignaLink, or with the K3 on the RF gain, but that pushes
weak signals too low to decode.

I am willing to accept that the SignaLink isn't a good sound card, but need
evidence/alternatives.

Cheers - Bill, AE6JV

On 8/20/12 at 22:08, [hidden email] (Joe Subich, W4TV) wrote:

>With real receivers you probably will never notice the difference in
>dynamic range between a 16 and 24 bit sound card. The receiver AGC
>- even only modest AGC - will keep the dynamic range presented to the
>sound card well within anything the 16 bit sound card can handle.
>That is *unless* the 16 bit card is poorly designed with internal noise
>that wastes a significant part of the 16 bit range.
>
>Even without AGC, the range between "background noise" (the noise floor
>of the demodulation process including sky noise, thermal noise in the
>IF, etc.) and the clipping point of the audio output can be
>considerably less than 90 dB in "real" receivers. Audio output levels
>tend to range from around 10 mV with "no signal" to just under 5V P-P
>(2V RMS) at best ... that's less than 50 dB.
>Even if one assumes the software can decode a 1 mV signal in the
>10 mV nose floor, the resulting dynamic range is still much less than
>90 dB provided by a properly designed 16 bit sound card and unless the
>24 bit soundcard uses other than the typical 5V power supply, its real
>performance will be limited by the same 5V P-P audio levels!
>
>Taken a step further - if the receiver produces a 1 mV noise floor with
>24V P-P output (+/- 12V supplies), that's *still* less than
>90 dB of range.

-----------------------------------------------------------------------
Bill Frantz | If the site is supported by | Periwinkle
(408)356-8506 | ads, you are the product. | 16345
Englewood Ave
www.pwpconsult.com | | Los Gatos,
CA 95032

______________________________________________________________
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

______________________________________________________________
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

Bill Frantz

Re: KX3 laptop question (was odds and ends...)

In reply to this post by G3TCT

I would look to see if any of the pad type computers have the
necessary hardware connections and software. I know there are
some ham radio programs for the iPad, but sitting in a motel in
Peoria isn't the best place to do research.

Cheers - Bill, AE6JV

On 8/20/12 at 8:01, [hidden email] (Graham Kimbell G3TCT) wrote:

>If I want to use a small laptop with the KX3 to display the
>spectrum when out portable, does anyone have a suggestion for
>such small device with stereo input? Preferably without a
>separate sound card.

-------------------------------------------------------------------------
Bill Frantz | Airline peanut bag: "Produced | Periwinkle
(408)356-8506 | in a facility that processes | 16345
Englewood Ave
www.pwpconsult.com | peanuts and other nuts." - Duh | Los Gatos,
CA 95032

______________________________________________________________
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

Joe Subich, W4TV-4

Re: KX3 laptop question (was odds and ends...)

In reply to this post by G3TCT

Here are several that list "Line In" in their specifications:

http://www.newegg.com/Product/Product.aspx?Item=N82E16829128004
http://www.newegg.com/Product/Product.aspx?Item=N82E16829128002
http://www.newegg.com/Product/Product.aspx?Item=N82E16829128007

That vendor also has several slightly larger (approx. 100 x 60 x 25
mm) units that provide both line and mic inputs. All are 48 KHz
(USB Audio CLASS device) sample rates.

73,

... Joe, W4TV

On 8/20/2012 11:01 AM, Graham Kimbell G3TCT wrote:

> If I want to use a small laptop with the KX3 to display the spectrum
> when out portable, does anyone have a suggestion for such small device
> with stereo input? Preferably without a separate sound card.
>
> Graham
>
> On 19:59, Richard Ferch wrote:
>>
>> I have no way to get stereo input into this sound card. An older
>> laptop I have has separate input and output jacks, but while the
>> output jack is stereo, the input jack is mono. If your laptop is like
>> either of these, your only recourse may be to get an external USB
>> sound card with stereo inputs.
>>
> ______________________________________________________________
> 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
>

Nr4c

Re: odds and ends...

In reply to this post by Jeff Herr

Yes, the SignalLink USB is a mono sounbd card with other features, a
very nice, reasonably quiet mono soundcard.

...bill nr4c

On Tue, 21 Aug 2012 05:53:47 -0700, Jeff Herr wrote:
> Is signalink mono?
>
>
>
>
>

______________________________________________________________
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

Mike Heitmann

Re: KX3 laptop question (was odds and ends...)

In reply to this post by Bill Frantz

I run iSDR on iPad connected to the KX3 with a camera adapter and a Griffin iMic
external soundcard.

A laptop running NaP3 with stereo mic inputs (or with a USB device like the
Griffin iMic) would work too.

Mike, N0SO

----- Original Message ----
On 8/20/12 at 8:01, [hidden email] (Graham Kimbell G3TCT) wrote:

>If I want to use a small laptop with the KX3 to display the
>spectrum when out portable, does anyone have a suggestion for
>such small device with stereo input? Preferably without a
>separate sound card.
______________________________________________________________
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

N8LP

Re: odds and ends...

In reply to this post by Don Wilhelm-4

Hi Don. I posted a response to your post yesterday, but apparently it didn't get posted to the list. Here is another attempt using Nabble. Copy of message follows...

Hi Don. I just received the digest version of your post. I don't recall ever having said that a 48kHz sampling rate will produce a 96kHz display span. All my postings and web site info states that the span will be roughly equal to the sampling rate (minus a tiny amount due to the rolloff of the anti-aliasing filter in the sound card). I saw Joe's comment copied in the same digest message, and it is not correct. I'm sure it was just a slip of the fingers. The confusion comes in that the displayed span is roughly equal to twice the sound card bandwidth... not twice the sound card sampling rate. The bandwidth of the card, of course, is roughly half the sampling rate if it is properly implemented.

73,
Larry N8LP

On 8/19/2012 11:51 PM, elecraft-request@mailman.qth.net wrote:
> From:elecraft-bounces@mailman.qth.net
> [mailto:elecraft-bounces@mailman.qth.net] On Behalf Of Don Wilhelm
> Sent: Sunday, August 19, 2012 9:54 PM
> To: WB4JFI
> Cc:elecraft@mailman.qth.net
> Subject: Re: [Elecraft] odds and ends...
>
> I don't know the advertized numbers, but Mr. Nyquist aside, there is a
> reason that two independent experts with panadapter displays (Joe Subich
> W4TV and Larry Phipps K8LP of LP-Pan fame) state that a soundcard with a
> 48 kHz rate will produce a 96 kHz span on the pan display.
>
> I do not doubt Nyquist, but I think the treatment of the numbers are a bit
> different (factor of 2) Could it be due to the two channels? I really don't
> know the answers and do not have the energy to investigate such things
> anymore, I just choose to trust the experts who deal with this I/Q stuff on
> a daily basis. I guess my scientific curiosity has declined with advancing
> years - it is no longer enjoyable to argue on the basis of observations vs.
> theory to sort out the differences - that was "fun mind games" many years
> ago. but today it is no longer a challenge.
>
> 73,
> Don W3FPR

Jeff Herr

Re: KX3 laptop question (was odds and ends...)

In reply to this post by Mike Heitmann

Whats the sampling rate on that?
The specs on the web site don't say

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Mike Heitmann
Sent: Tuesday, August 21, 2012 7:15 AM
To: [hidden email]
Subject: Re: [Elecraft] KX3 laptop question (was odds and ends...)

I run iSDR on iPad connected to the KX3 with a camera adapter and a Griffin
iMic external soundcard.

A laptop running NaP3 with stereo mic inputs (or with a USB device like the
Griffin iMic) would work too.

Mike, N0SO

----- Original Message ----
On 8/20/12 at 8:01, [hidden email] (Graham Kimbell G3TCT) wrote:

>If I want to use a small laptop with the KX3 to display the spectrum
>when out portable, does anyone have a suggestion for such small device
>with stereo input? Preferably without a separate sound card.
______________________________________________________________
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

______________________________________________________________
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

MontyS

Re: KX3 laptop question (was odds and ends...)

Griffin iMic samples at 44khz.

Monty K2DLJ

Whats the sampling rate on that?
The specs on the web site don't say

Subject: Re: [Elecraft] KX3 laptop question (was odds and ends...)

I run iSDR on iPad connected to the KX3 with a camera adapter and a Griffin
iMic external soundcard.

A laptop running NaP3 with stereo mic inputs (or with a USB device like the
Griffin iMic) would work too.

Mike, N0SO

----- Original Message ----
On 8/20/12 at 8:01, [hidden email] (Graham Kimbell G3TCT) wrote:

>If I want to use a small laptop with the KX3 to display the spectrum
>when out portable, does anyone have a suggestion for such small device
>with stereo input? Preferably without a separate sound card.
______________________________________________________________
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

Keith Heimbold

Re: KX3 laptop question (was odds and ends...)

I plan to run this configuration in my mobile. Which generation of iPad works with this configuration? I was considering looking on the used market for the iPad. Please advise.

Thanks,

Keith
AG6AZ

>
> I run iSDR on iPad connected to the KX3 with a camera adapter and a Griffin
> iMic external soundcard.
>
> A laptop running NaP3 with stereo mic inputs (or with a USB device like the
> Griffin iMic) would work too.
>
______________________________________________________________
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

Eric Swartz - WA6HHQ

Re: KX3 laptop question (was odds and ends...)

Administrator

We are demo'ing it at the shows on an iPad1 and the 'new' iPad (AKA iPad3).

73,

Eric

www.elecraft.com
_..._

On Aug 22, 2012, at 12:04 PM, Keith Heimbold <[hidden email]> wrote:

> I plan to run this configuration in my mobile. Which generation of iPad works with this configuration? I was considering looking on the used market for the iPad. Please advise.
>
> Thanks,
>
> Keith
> AG6AZ
>
>>
>> I run iSDR on iPad connected to the KX3 with a camera adapter and a Griffin
>> iMic external soundcard.
>>
>> A laptop running NaP3 with stereo mic inputs (or with a USB device like the
>> Griffin iMic) would work too.
>>
> ______________________________________________________________
> 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