[Elecraft] Need local help

Tue Jun 9 18:10:06 EDT 2015

Just make sure you get one that can handle line level inputs, or you'll 
have to build an attenuator....

73, Ross N4RP

On 6/9/2015 5:45 PM, Joe Subich, W4TV wrote:
>
> In addition to the sound cards recommended in the K9YC document,
> these have been reported to be solid performing cards:
>   http://www.newegg.com/Product/Product.aspx?Item=N82E16829128010 ($36)
>   http://www.newegg.com/Product/Product.aspx?Item=N82E16829126101 ($18)
>   http://www.newegg.com/Product/Product.aspx?Item=N82E16829126101 ($40)
>
> That list is not exhaustive - it does not include many of the <$100
> cards being recommended for SDR use or many of the <$10 "dongles" that
> work exceedingly well for simple audio I/O purposes.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2015-06-09 5:16 PM, David Ahrendts 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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>>>>
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>>
>>
>>
>>
>> David Ahrendts   davidahrendts at me.com
>>
>>
>>
>>
>>
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