[Elecraft] Signalink and K3 (you do not need need a Signal Link)

[dmoes at nexicom.net]

 Jim  Im just curious

 using the mic input is a problem because of noise presumably because 
you have to set the levels way to low so that the line output of the 
K3 doesn't swamp the mic input and by this you drastically narrow the 
dynamic range.   would building some sort of attenuator at the mic 
input help  in a pinch?  I know that having a good external usb device 
with line level inputs is ideal  but sometimes thats not so handy when 
setting up field day and you forgot the good card or need many for all 
the stations and doing it on a budget?

As for freeing up the serial port   I use Virtual serial port emulator 
 as a data splitter to one serial port for multiple applications.   
Its fast enough that using RTS and DTR for ptt and keying CW and it 
works fine without timing issues even when multiple programs are 
watching the same port.
  well at least up to about 30WPM and probably well beyond but my 
brain wont go faster than that for CW



David Moes
VE3DVY


On Wednesday 12/11/2014 at 2:00 pm, Jim Brown  wrote:
> On Wed,11/12/2014 10:06 AM, RIchard Williams via Elecraft wrote:
>>
>> All I did was connect the line out on the K3 to the mic in on the 
>> computer (using a stereo cable) and the line in on the K3 to the 
>> headphone jack on the computer.
>
> Yes, it works. The headphone out to the K3 is good enough for all ham
> uses. The mic input is NOT good enough -- as has been noted, mic 
> inputs
> tend to be very noisy, so they don't allow decoding of weaker signals.
> The difference can easily be 10 dB (10x the power). THAT'S why anyone
> serious about digital modes needs a dedicated USB I/O box. See the 
> link
> I posted yesterday for recommendations of specific products.  Or go to
> k9yc.com/publish.htm
>
>>
>> Only thing missing was a way to key the K3.   This is easily solved by 
>> using the RS-232 port on the K3;
>
> It's also easily solved by using VOX, which doesn't tie up a serial
> port. Just pay attention to Don Wilhelm's advice.
>
> 73, Jim K9YC
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