[Elecraft] K2 8R/keyline-RF Timing Questions

[Bill Coleman]

Perhaps you remember this:

On Feb 17, 2008, at 1:58 PM, w2bvh wrote:

> These measurements were done with the new K2 firmware just recently  
> installed: v2.04P/1.09.
>
> 1. In CW mode, 8R Hold= normal with t-r delay set to 0.02 sec
>   a) 8R goes low and rf starts rising 17ms +/- 1ms later
>   b) RF starts declining and 8R rises 5ms later. Please note this is  
> a normal 90%-10% fall time measurement. RF is at 100% output 5ms  
> before the       rising edge of 8R and declines exponentially from  
> that point in time. At the rising edge of 8R the rf is essentially 0.
>
> 2. In CW mode, 8R Hold= normal with t-r delay set to 1.0 sec
>   a) measurements exactly as above. So I assume that  in this set- 
> up  t-r delay means speaker un-mute delay.
>
> 3. In CW mode, 8RHold=hold with t-r delay set to 0.10 sec
>   a) 8R goes low and rf starts rising 18ms later. Same as above
>   b) RF starts declining and 8R rises 0.10 sec later
>   c) I tried with t-r delay 0f 0.05sec and for that value RF starts  
> declining and 8R rises 0.05 sec later.
>
> 4. In SSB mode with a constant audio tone injected int to the mic  
> connector and with PTT keyed using a hand key connected to the key  
> jack on the back apron, I get the following result:
>   a) 8R goes low and rf starts rising 18ms later
>   b) RF starts declining and 8R rises 10 ms later
>   c) these measurements are independent of the the value of t-r  
> value and 8R Hold value.
>
> Conclusion is 8R Hold=hold causes 8R to rise t-r delay seconds after  
> rf starts to decline in CW mode. Otherwise the 8R line's timing is  
> fixed and as described above.

Question: what happens in SSB mode with VOX instead of PTT as the  
audio tone is keyed on and off?

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901