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[K3] MMTTY

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Mike Reublin

[K3] MMTTY

How critical is the match between the K3 and MMTTY for it to transmit using VOX.
If I key the rig manually, or use DTR it's OK. A different program (but using MMTTY)
works just fine.

Any programmers (preferably Delphi) out there who have worked with the MMTTY OCX?

73, Mike NF4L
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Richard Ferch

Re: [K3] MMTTY

Mike,

I have not found this to be critical at all, once the audio and VOX levels
are set. First, using manual keying adjust the level out from the sound
card and the LINE input level on the K3 to just get the required 4-5 bars
of ALC. Then increase the K3's MAIN:VOX GN setting until the output from
the sound card triggers the VOX reliably.

If you also use voice modes with VOX, your VOX GN setting might be
different between voice and data modes. If this is a problem, my
suggestion would be to try changing the gain distribution in the first
step, by increasing the sound card output level and decreasing the K3's
LINE input level. This should allow you to use a lower VOX GN setting.
Just make sure that the sound card level is not set so high that the audio
amplifier inside the sound card is overdriven.

73,
Rich VE3KI

NF4L wrote:

> How critical is the match between the K3 and MMTTY for it to
> transmit using VOX. If I key the rig manually, or use DTR it's OK.
> A different program (but using MMTTY) works just fine.

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alsopb

Re: [K3] MMTTY

And turn off all WINDOWS alterts, sounds when operating AFSK!

73 DE Brian/K3KO

Richard Ferch wrote:

> Mike,
>
> I have not found this to be critical at all, once the audio and VOX levels
> are set. First, using manual keying adjust the level out from the sound
> card and the LINE input level on the K3 to just get the required 4-5 bars
> of ALC. Then increase the K3's MAIN:VOX GN setting until the output from
> the sound card triggers the VOX reliably.
>
> If you also use voice modes with VOX, your VOX GN setting might be
> different between voice and data modes. If this is a problem, my
> suggestion would be to try changing the gain distribution in the first
> step, by increasing the sound card output level and decreasing the K3's
> LINE input level. This should allow you to use a lower VOX GN setting.
> Just make sure that the sound card level is not set so high that the audio
> amplifier inside the sound card is overdriven.
>
> 73,
> Rich VE3KI
>
>
> NF4L wrote:
>
>> How critical is the match between the K3 and MMTTY for it to
>> transmit using VOX. If I key the rig manually, or use DTR it's OK.
>> A different program (but using MMTTY) works just fine.
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
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> Please help support this email list: http://www.qsl.net/donate.html
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Mike Reublin

Re: [K3] MMTTY

In reply to this post by Richard Ferch

Thanks Rich.

Turning up the vox gain did it, and I was able to turn down the computer sound card a
bit to get the ALC reading correct. I didn't want to mess with the MIC gain, because
it's touchy for me to set it for phone. I'd like to turn VOX off for phone only, but
that's not possible yet.

The volume on my sound card is set using the "Main" and "Wave" sliders. No line out
control, so anytime I adjust the volume, I'm hosing my RTTY settings. I'm going to
look at an additional sound card, or maybe go to FSK.

What really threw me was that using one program it worked fine and one didn't, both
programs use MMTTY, plus I've had the mark tone mismatch bite me before. I don't see
a level control in MMTTY itself that would account for one working and one not.

But as they say "All's well that ends".

Thanks for the solution!

73, Mike

On 8/8/2010 10:45 AM, Richard Ferch wrote:

> Mike,
>
> I have not found this to be critical at all, once the audio and VOX levels
> are set. First, using manual keying adjust the level out from the sound
> card and the LINE input level on the K3 to just get the required 4-5 bars
> of ALC. Then increase the K3's MAIN:VOX GN setting until the output from
> the sound card triggers the VOX reliably.
>
> If you also use voice modes with VOX, your VOX GN setting might be
> different between voice and data modes. If this is a problem, my
> suggestion would be to try changing the gain distribution in the first
> step, by increasing the sound card output level and decreasing the K3's
> LINE input level. This should allow you to use a lower VOX GN setting.
> Just make sure that the sound card level is not set so high that the audio
> amplifier inside the sound card is overdriven.
>
> 73,
> Rich VE3KI
>
>
> NF4L wrote:
>
>> How critical is the match between the K3 and MMTTY for it to
>> transmit using VOX. If I key the rig manually, or use DTR it's OK.
>> A different program (but using MMTTY) works just fine.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
>

Mike Reublin

Re: [K3] MMTTY

In reply to this post by alsopb

Ohhhhhhh yeah, Been bit by that too.

73, Mike

On 8/8/2010 10:53 AM, Brian Alsop wrote:

> And turn off all WINDOWS alterts, sounds when operating AFSK!
>
> 73 DE Brian/K3KO
>
> Richard Ferch wrote:
>> Mike,
>>
>> I have not found this to be critical at all, once the audio and VOX levels
>> are set. First, using manual keying adjust the level out from the sound
>> card and the LINE input level on the K3 to just get the required 4-5 bars
>> of ALC. Then increase the K3's MAIN:VOX GN setting until the output from
>> the sound card triggers the VOX reliably.
>>
>> If you also use voice modes with VOX, your VOX GN setting might be
>> different between voice and data modes. If this is a problem, my
>> suggestion would be to try changing the gain distribution in the first
>> step, by increasing the sound card output level and decreasing the K3's
>> LINE input level. This should allow you to use a lower VOX GN setting.
>> Just make sure that the sound card level is not set so high that the audio
>> amplifier inside the sound card is overdriven.
>>
>> 73,
>> Rich VE3KI
>>
>>
>> NF4L wrote:
>>
>>> How critical is the match between the K3 and MMTTY for it to
>>> transmit using VOX. If I key the rig manually, or use DTR it's OK.
>>> A different program (but using MMTTY) works just fine.
>>
>> ______________________________________________________________
>> 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
>>

Richard Ferch

Re: [K3] MMTTY

In reply to this post by Mike Reublin

Mike,

On the K3, MIC level and LINE level settings are independent; you can
adjust the LINE level in data modes without affecting the MIC level for
voice and vice versa.

Regarding changing levels in different software, you might take a look at
QuickMix (<http://www.ptpart.co.uk/quickmix/>) - this software allows you
to save and restore mixer settings separately for each application.

Brian's comment on Windows sounds is my main reason for using a second
sound card. For digital modes, pretty much any sound card will do; I use
an old SB16 card that I keep moving from one computer to the next. I leave
the Windows sounds, music players, etc. on the motherboard sound device
and use the SB16 for my digital-mode software.

73,
Rich VE3KI

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Mike Reublin

Re: [K3] MMTTY

Rich,

Both use the MIC knob tho, right?

Quickmix looks good, thanks for the link.

This afternoon I'm may run down to the candy store and look at sound cards, probably
a USB one. When you add another sound device, how do the Windows mixer controls work?
I'd guess it works for the default device. How is the second one adjusted?

Mike

On 8/8/2010 12:26 PM, Richard Ferch wrote:

> Mike,
>
> On the K3, MIC level and LINE level settings are independent; you can
> adjust the LINE level in data modes without affecting the MIC level for
> voice and vice versa.
>
> Regarding changing levels in different software, you might take a look at
> QuickMix (<http://www.ptpart.co.uk/quickmix/>) - this software allows you
> to save and restore mixer settings separately for each application.
>
> Brian's comment on Windows sounds is my main reason for using a second
> sound card. For digital modes, pretty much any sound card will do; I use
> an old SB16 card that I keep moving from one computer to the next. I leave
> the Windows sounds, music players, etc. on the motherboard sound device
> and use the SB16 for my digital-mode software.
>
> 73,
> Rich VE3KI
>
>
> ______________________________________________________________
> 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: [K3] MMTTY

> Both use the MIC knob tho, right?

Yes, but the mic knob is an encoder ... changes mic level in SSB
and Line level in Data A/AFSK A if you are using Line In. The
mic /line levels are maintained separately.

> When you add another sound device, how do the Windows mixer
> controls work?

Depends on the version of Windows but one can generally change
the device being controlled - using the "menu bar" in 2000/XP
and directly selecting the endpoint in Vista/Win 7.

For inexpensive basic USB sound cards look at:

http://www.newegg.com/Product/Product.aspx?Item=N82E16829128004
Line IN/Line Out for $17 or

http://www.newegg.com/Product/Product.aspx?Item=N82E16829180006
Line In/Mic In/Line Out for $30.00

Similar products are available from other vendors.

73,

... Joe, W4TV

On 8/8/2010 1:03 PM, Mike wrote:

> Rich,
>
> Both use the MIC knob tho, right?
>
> Quickmix looks good, thanks for the link.
>
> This afternoon I'm may run down to the candy store and look at sound cards, probably
> a USB one. When you add another sound device, how do the Windows mixer controls work?
> I'd guess it works for the default device. How is the second one adjusted?
>
> Mike
>
> On 8/8/2010 12:26 PM, Richard Ferch wrote:
>> Mike,
>>
>> On the K3, MIC level and LINE level settings are independent; you can
>> adjust the LINE level in data modes without affecting the MIC level for
>> voice and vice versa.
>>
>> Regarding changing levels in different software, you might take a look at
>> QuickMix (<http://www.ptpart.co.uk/quickmix/>) - this software allows you
>> to save and restore mixer settings separately for each application.
>>
>> Brian's comment on Windows sounds is my main reason for using a second
>> sound card. For digital modes, pretty much any sound card will do; I use
>> an old SB16 card that I keep moving from one computer to the next. I leave
>> the Windows sounds, music players, etc. on the motherboard sound device
>> and use the SB16 for my digital-mode software.
>>
>> 73,
>> Rich VE3KI
>>
>>
>> ______________________________________________________________
>> 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]
>
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> Please help support this email list: http://www.qsl.net/donate.html
>

Richard Ferch

Re: [K3] MMTTY

In reply to this post by Mike Reublin

Mike,

Both level controls use the MIC/SPEED knob. You can see the current
setting by tapping the knob twice (once for CW speed, once for the level
setting). Right now mine reads MIC 21 when I tap it with the radio in a
voice mode, and LINE 8 when I tap it with the radio in data mode.
Adjusting either one has no effect on the other.

Re the Windows mixer, I can only talk about the mixer in Windows XP and
earlier. Vista and Windows 7 are different, and I am not familiar with
them. I am not at a computer with multiple sound cards to verify this, but
I would expect that if you use MMTTY to call up the mixer (from the
Option(O) > Sound card output level(V) menu item), it should invoke the
mixer for the sound device MMTTY is using. On the other hand, if you call
up the mixer from the Windows Start menu it will start up the output mixer
for the default sound card.

Either way, you should see the name of the sound card in the status bar at
the bottom of the mixer panel. If this is not the sound card you want to
adjust, you can use the mixer's Options > Properties menu item; the
control at the top of the dialog box is a pull-down list of sound devices
to choose from. Below that you can select either the playback (transmit)
mixer or the recording (receive) mixer.

BTW, MMTTY version 1.66G has a Sound card tab in the MMTTY Setup window
that makes selecting sound cards much easier than using the numerical
device identifier under the Misc tab.

73,
Rich VE3KI

NF4L wrote:

> Both use the MIC knob tho, right?
>
> Quickmix looks good, thanks for the link.
>
> This afternoon I'm may run down to the candy store and look at
> sound cards, probably a USB one. When you add another sound device,
> how do the Windows mixer controls work? I'd guess it works for the
> default device. How is the second one adjusted?

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Mike Reublin

Re: [K3] MMTTY

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

Thanks Joe.

This will mostly be on XP, with occasional excursions on Win7. What does "directly
selecting the endpoint" mean? I'm real new to Win7.

I saw some 99 cent units on the estore. Maybe a bit TOO cheap. ;-)

73, Mike NF4L

On 8/8/2010 1:36 PM, Joe Subich, W4TV wrote:

> > Both use the MIC knob tho, right?
>
> Yes, but the mic knob is an encoder ... changes mic level in SSB
> and Line level in Data A/AFSK A if you are using Line In. The
> mic /line levels are maintained separately.
>
> > When you add another sound device, how do the Windows mixer
> > controls work?
>
> Depends on the version of Windows but one can generally change
> the device being controlled - using the "menu bar" in 2000/XP
> and directly selecting the endpoint in Vista/Win 7.
>
> For inexpensive basic USB sound cards look at:
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16829128004
> Line IN/Line Out for $17 or
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16829180006
> Line In/Mic In/Line Out for $30.00
>
> Similar products are available from other vendors.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 8/8/2010 1:03 PM, Mike wrote:
>> Rich,
>>
>> Both use the MIC knob tho, right?
>>
>> Quickmix looks good, thanks for the link.
>>
>> This afternoon I'm may run down to the candy store and look at sound cards, probably
>> a USB one. When you add another sound device, how do the Windows mixer controls work?
>> I'd guess it works for the default device. How is the second one adjusted?
>>
>> Mike
>>
>> On 8/8/2010 12:26 PM, Richard Ferch wrote:
>>> Mike,
>>>
>>> On the K3, MIC level and LINE level settings are independent; you can
>>> adjust the LINE level in data modes without affecting the MIC level for
>>> voice and vice versa.
>>>
>>> Regarding changing levels in different software, you might take a look at
>>> QuickMix (<http://www.ptpart.co.uk/quickmix/>) - this software allows you
>>> to save and restore mixer settings separately for each application.
>>>
>>> Brian's comment on Windows sounds is my main reason for using a second
>>> sound card. For digital modes, pretty much any sound card will do; I use
>>> an old SB16 card that I keep moving from one computer to the next. I leave
>>> the Windows sounds, music players, etc. on the motherboard sound device
>>> and use the SB16 for my digital-mode software.
>>>
>>> 73,
>>> Rich VE3KI
>>>

Mike Reublin

Re: [K3] MMTTY

In reply to this post by Richard Ferch

Rich,
A very good explanation. I got 1.66G a couple of days ago.

It's SO nice when a problem is solved.

73 Mike

On 8/8/2010 2:04 PM, Richard Ferch wrote:

> Mike,
>
> Both level controls use the MIC/SPEED knob. You can see the current
> setting by tapping the knob twice (once for CW speed, once for the level
> setting). Right now mine reads MIC 21 when I tap it with the radio in a
> voice mode, and LINE 8 when I tap it with the radio in data mode.
> Adjusting either one has no effect on the other.
>
> Re the Windows mixer, I can only talk about the mixer in Windows XP and
> earlier. Vista and Windows 7 are different, and I am not familiar with
> them. I am not at a computer with multiple sound cards to verify this, but
> I would expect that if you use MMTTY to call up the mixer (from the
> Option(O)> Sound card output level(V) menu item), it should invoke the
> mixer for the sound device MMTTY is using. On the other hand, if you call
> up the mixer from the Windows Start menu it will start up the output mixer
> for the default sound card.
>
> Either way, you should see the name of the sound card in the status bar at
> the bottom of the mixer panel. If this is not the sound card you want to
> adjust, you can use the mixer's Options> Properties menu item; the
> control at the top of the dialog box is a pull-down list of sound devices
> to choose from. Below that you can select either the playback (transmit)
> mixer or the recording (receive) mixer.
>
> BTW, MMTTY version 1.66G has a Sound card tab in the MMTTY Setup window
> that makes selecting sound cards much easier than using the numerical
> device identifier under the Misc tab.
>
> 73,
> Rich VE3KI
>
>
> NF4L wrote:
>
>> Both use the MIC knob tho, right?
>>
>> Quickmix looks good, thanks for the link.
>>
>> This afternoon I'm may run down to the candy store and look at
>> sound cards, probably a USB one. When you add another sound device,
>> how do the Windows mixer controls work? I'd guess it works for the
>> default device. How is the second one adjusted?
>

Joe Subich, W4TV-4

Re: [K3] MMTTY

In reply to this post by Mike Reublin

> This will mostly be on XP, with occasional excursions on Win7.
> What does "directly selecting the endpoint" mean? I'm real new
> to Win7.

When you open the "Volume Mixer" in Windows 7, the "device" box
has a drop down box (down arrow to the right of "Speakers" etc.)
that allows you to select the output to be controlled. With
Vista, there is one entry in the Menu bar that says "device."
In either case you select the "endpoint" (output) to be controlled.

In Vista/Windows 7 terminology an "endpoint" is the output or input
device (or jack) on a soundcard. For example, "speakers", "headpone",
"HDMI", "SPDIF", etc. A single soundcard may have only one active
input endpoint (mic, line, SPDIF, CD, etc.) and one output endpoint
(speakers, headphone, SPDIF, HDMI, etc.) at a particular time. If
one application opens the Line Input on a soundcard other applications
may not open the Mic Input on that soundcard until the original
application releases the line input. Note - if an input or output
endpoint is defined as the Windows system or communications default
(there are four defaults, system input, system output, communications
input and communications output) they are "locked" and applications
may not change (use) other endpoints on those soundcard(s).

73,

... Joe, W4TV

On 8/8/2010 5:44 PM, Mike wrote:

> Thanks Joe.
>
> This will mostly be on XP, with occasional excursions on Win7. What does "directly
> selecting the endpoint" mean? I'm real new to Win7.
>
> I saw some 99 cent units on the estore. Maybe a bit TOO cheap. ;-)
>
> 73, Mike NF4L
>
> On 8/8/2010 1:36 PM, Joe Subich, W4TV wrote:
>> > Both use the MIC knob tho, right?
>>
>> Yes, but the mic knob is an encoder ... changes mic level in SSB
>> and Line level in Data A/AFSK A if you are using Line In. The
>> mic /line levels are maintained separately.
>>
>> > When you add another sound device, how do the Windows mixer
>> > controls work?
>>
>> Depends on the version of Windows but one can generally change
>> the device being controlled - using the "menu bar" in 2000/XP
>> and directly selecting the endpoint in Vista/Win 7.
>>
>> For inexpensive basic USB sound cards look at:
>>
>> http://www.newegg.com/Product/Product.aspx?Item=N82E16829128004
>> Line IN/Line Out for $17 or
>>
>> http://www.newegg.com/Product/Product.aspx?Item=N82E16829180006
>> Line In/Mic In/Line Out for $30.00
>>
>> Similar products are available from other vendors.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>> On 8/8/2010 1:03 PM, Mike wrote:
>>> Rich,
>>>
>>> Both use the MIC knob tho, right?
>>>
>>> Quickmix looks good, thanks for the link.
>>>
>>> This afternoon I'm may run down to the candy store and look at sound cards, probably
>>> a USB one. When you add another sound device, how do the Windows mixer controls work?
>>> I'd guess it works for the default device. How is the second one adjusted?
>>>
>>> Mike
>>>
>>> On 8/8/2010 12:26 PM, Richard Ferch wrote:
>>>> Mike,
>>>>
>>>> On the K3, MIC level and LINE level settings are independent; you can
>>>> adjust the LINE level in data modes without affecting the MIC level for
>>>> voice and vice versa.
>>>>
>>>> Regarding changing levels in different software, you might take a look at
>>>> QuickMix (<http://www.ptpart.co.uk/quickmix/>) - this software allows you
>>>> to save and restore mixer settings separately for each application.
>>>>
>>>> Brian's comment on Windows sounds is my main reason for using a second
>>>> sound card. For digital modes, pretty much any sound card will do; I use
>>>> an old SB16 card that I keep moving from one computer to the next. I leave
>>>> the Windows sounds, music players, etc. on the motherboard sound device
>>>> and use the SB16 for my digital-mode software.
>>>>
>>>> 73,
>>>> Rich VE3KI
>>>>
>
>
> ______________________________________________________________
> 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 Reublin

Re: [K3] MMTTY

Thanks, Joe.

I dunno how you keep up with all you do. Trust M$ to make an Alp out of an anthill.

73, Mike

On 8/8/2010 7:58 PM, Joe Subich, W4TV wrote:

> > This will mostly be on XP, with occasional excursions on Win7.
> > What does "directly selecting the endpoint" mean? I'm real new
> > to Win7.
>
> When you open the "Volume Mixer" in Windows 7, the "device" box
> has a drop down box (down arrow to the right of "Speakers" etc.)
> that allows you to select the output to be controlled. With
> Vista, there is one entry in the Menu bar that says "device."
> In either case you select the "endpoint" (output) to be controlled.
>
> In Vista/Windows 7 terminology an "endpoint" is the output or input
> device (or jack) on a soundcard. For example, "speakers", "headpone",
> "HDMI", "SPDIF", etc. A single soundcard may have only one active
> input endpoint (mic, line, SPDIF, CD, etc.) and one output endpoint
> (speakers, headphone, SPDIF, HDMI, etc.) at a particular time. If
> one application opens the Line Input on a soundcard other applications
> may not open the Mic Input on that soundcard until the original
> application releases the line input. Note - if an input or output
> endpoint is defined as the Windows system or communications default
> (there are four defaults, system input, system output, communications
> input and communications output) they are "locked" and applications
> may not change (use) other endpoints on those soundcard(s).
>
> 73,
>
> ... Joe, W4TV

Julian, G4ILO

Re: [K3] MMTTY

In reply to this post by Mike Reublin

Mike-14-3 wrote

This will mostly be on XP, with occasional excursions on Win7. What does "directly
selecting the endpoint" mean? I'm real new to Win7.

I saw some 99 cent units on the estore. Maybe a bit TOO cheap. ;-)

I have tried some of these cheap units from eBay. Too cheap is right. They may seem to work on PSK31 and they are fine for audio but I doubt if weak signal copy of digimodes is very good. I tried using one for packet and even though the signal looked OK on the waterfall I never decoded a single packet. I don't know what the bit resolution or sample rate they use but I suspect the drivers do a crude resampling between the parameters the software selects and the ones the device actually runs at and a lot of information gets lost in the process.

What you can do, though, is reconfigure windows so the cheapie USB adapter is the default for computer audio, which frees up the on board sound card for digital radio use. Despite comments in various places to the contrary, I've always found the built-in audio chips to work pretty well for digital modes.

Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

Mike Reublin

Re: [K3] MMTTY

I'm sure I'll get something pricier than .99. In a lot of cases tho, the 'no-brand'
stuff isn't good enough. Putting the add-on as primary is a good thought.

73, Mike

On 8/9/2010 10:21 AM, Julian, G4ILO wrote:

>
> Mike-14-3 wrote:
>>
>> This will mostly be on XP, with occasional excursions on Win7. What does
>> "directly
>> selecting the endpoint" mean? I'm real new to Win7.
>>
>> I saw some 99 cent units on the estore. Maybe a bit TOO cheap. ;-)
>>
>>
> I have tried some of these cheap units from eBay. Too cheap is right. They
> may seem to work on PSK31 and they are fine for audio but I doubt if weak
> signal copy of digimodes is very good. I tried using one for packet and even
> though the signal looked OK on the waterfall I never decoded a single
> packet. I don't know what the bit resolution or sample rate they use but I
> suspect the drivers do a crude resampling between the parameters the
> software selects and the ones the device actually runs at and a lot of
> information gets lost in the process.
>
> What you can do, though, is reconfigure windows so the cheapie USB adapter
> is the default for computer audio, which frees up the on board sound card
> for digital radio use. Despite comments in various places to the contrary,
> I've always found the built-in audio chips to work pretty well for digital
> modes.
>
> -----
> Julian, G4ILO. K2 #392 K3 #222.
> * G4ILO's Shack - http://www.g4ilo.com
> * KComm - http://www.g4ilo.com/kcomm.html
> * KTune - http://www.g4ilo.com/ktune.html
>