[Elecraft] Need local help

Tue Jun 9 17:27:50 EDT 2015

I got the Numark STEREO iO Analog-To-Digital DJ Interface instead of the Signal Link…  Half the price and works well.

73

Gil, W1RG

From: Walter Underwood
Sent: ‎Tuesday‎, ‎June‎ ‎9‎, ‎2015 ‎5‎:‎20‎ ‎PM
To: elecraft at mailman.qth.net

Please read this well-researched document. It has already been recommended in this string.

http://audiosystemsgroup.com/USB_Interfaces.pdf

wunder
K6WRU
CM87wj
http://observer.wunderwood.org/ (my blog)

On Jun 9, 2015, at 2:16 PM, David Ahrendts <davidahrendts at me.com> wrote:

> Gentlemen, suggest some alternatives to the SignalLink USB for digital. Would like to research.
> 
> David A., KC0XT
> 
>> On Jun 9, 2015, at 2:10 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>> 
>> 
>>> I think there is one point that is overlooked in a lot of these
>>> discussions. It really doesn't take much of a sound card to do
>>> digital signal processing on 3 KHz or less audio streram.
>> 
>> There are a significant number of reports concerning the issues with
>> Signalink on-line if one bothers to look.  In general they relate to
>> improper filtering of the USB +5V power, lack of a regulator for the
>> V/2 reference to the sound codec (analog to digital converter), lack
>> of proper bypassing of noise from the various chips, requirement that
>> the digital to analog converter be run at too high a level in order
>> for the "VOX" to trigger reliably, etc.
>> 
>> In general, this means Signalink loses 15 dB or more of signal to
>> noise ratio (which is a big deal with modes like JT65 and JT9 on HF)
>> on the receive side and is much more "dirty" (often with multiple
>> audio signals) on transmit.
>> 
>> You're correct that it does not take much of a sound card to decode
>> some signals.  However, the Signalink "sound card" contains most of
>> the same components as the generic USB sound products that perform
>> much better - yet Signalink costs two to three times as much.
>> 
>> 73,
>> 
>>  ... Joe, W4TV
>> 
>> 
>> On 2015-06-09 3:59 PM, Barry LaZar wrote:
>>> Joe,
>>>    You bring an interesting point of view. I've been using a SignaLink
>>> USB for at least 3-4 years. I haven't had an issue with it except not
>>> enough time to play. And, I can't blame the manufacturer for that.
>>> 
>>>    I think there is one point that is overlooked in a lot of these
>>> discussions. It really doesn't take much of a sound card to do digital
>>> signal processing on 3 KHz or less audio streram. However, I would never
>>> use a card in my laptop or my I/F for some of the heavier lifting here
>>> in my shack where I need 96KHz sample rates or better with 24 bit
>>> digitizing. But for just hook it up, set the levels and go, an interface
>>> with a built in sound card is not a bad way to go. In many cases, it is
>>> just easier to do and it allows for more flexibility.
>>> 
>>> 73,
>>> Barry
>>> K3NDM
>>> 
>>> On 6/9/2015 3:11 PM, Joe Subich, W4TV wrote:
>>>> 
>>>> On 2015-06-09 12:02 PM, Bob N3MNT wrote:
>>>>> OP said computer did not have an audio input.
>>>> 
>>>> He's still better off with an external USB sound card of reasonable
>>>> quality and a pair of audio cables than using the Tigertronix product
>>>> of dubious quality and well documented poor design.  A simple USB sound
>>>> card of reasonable quality will cost 1/3 to 1/2 as much as the inferior
>>>> "amateur" product.
>>>> 
>>>> 73,
>>>> 
>>>>  ... Joe, W4TV
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> 
> 
> 
> David Ahrendts   davidahrendts at me.com   
> 
> 
> 
> 
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