[Elecraft] K2 PTT problem

[Don Wilhelm]

OK Ron,

Now we get a bit more complicated, the easy stuff is out of the way.
Go to CW mode and see if you can key the K2 with the mike PTT button.  
Depending on how you have the INP menu set you may get either a string 
of dots or a long key-down.
If that works, the problem is not with the base K2 firmware, but might 
be with the KSB2 (if that test above does not work OK, then you have a 
bad input on the K2 firmware chip - U6 pin 30.

If and only if the above checked OK, then  switch to SSB mode and hold 
the PTT Button in while checking KSB2 U1 pin 26 to see if it goes to a 
high level (it should)  Also check U1 pin 15 which should also go high 
during PTT. (A high level is greater than 4 volts, but will likely be 
about 6).
Also make certain the OP1 filter is selected for SSB receive and check 
KSB2 U1 pin 21 - it should be high during receive and drop to close to 
zero during transmit (or PTT depressed).
If all check OK, then the KSB2 firmware chip is getting the proper 
inputs and doing its proper function for PTT and SSB transmit and 
receive, so if that is the case, we will have to look for something more 
obscure.  If all those checks on the KSB2 board do not work out, then 
plan to replace the KSB2 firmware chip.


73,
Don W3FPR

RONALD R FREEMAN wrote:
> Hi Don:
>
> The SSBA is set to "3" and not to "BAL".  Good hint and I had to go check it.
>
> The VOX is set to PTT.  I've tried all the options there.
>
> I still feel it is something stupid I did in the menu, but I sure can't find it!!!
>
> 73's
>
> Ron
>  		 	   		  
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