[Elecraft] Technical question on keying of an SDR radio

[Bob McGraw K4TAX]

And  some of today's software applications {HRD}  have provision for 
MCW.  One must be careful how the interface between the computer and 
radio is constructed so as not to have anything in the audio path which 
would contribute to less than a pure sinewave signal.    Actually this 
is exactly how AFSK and other data modes work.  A tone frequency is sent 
to the radio to produce the MARK signal and a different frequency tone 
is sent to produce a SPACE signal.

In all cases,  a clean signal path between the computer and the radio is 
found to be mandatory.   Hum, buzz, clicks, pops and a mike left open 
are all a NO NO!

73

Bob, K4TAX


On 4/9/2019 1:16 PM, Fred Jensen wrote:
> A technique pioneered by Art Collins many years ago in the KWM2 and 
> S-line.
>
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
> On 4/9/2019 3:08 AM, Victor Rosenthal 4X6GP wrote:
>> Oh no! NOW you tell me that all these years that I have believed that 
>> I have been operating CW, it's really SSB!
>>
>> (Disclaimer to avoid the otherwise inevitable explanations that a 
>> pure audio tone transmitted via SSB is identical with CW: I know that).
>>
>> 73,
>> Victor, 4X6GP
>> Rehovot, Israel
>
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