[Elecraft] Need local help

[David Ahrendts]

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