[Elecraft] k3 : no CAT mode change (was Split Operation)

[Kok Chen]

On Oct 7, 2008, at 12:18 PM, Julian, G4ILO wrote:
> David Ferrington, M0XDF wrote:
>>
>> Thanks Julian, what the length of the delay?
>>
> 200ms.

For what its worth, I just wrote a quick test.

Environment
----------------

K3 FW 2.23
Computer: PowerMac 2x2.3 GHz, Mac OS X 10.5.3
Serial Port: Keyspan High Speed USB adapter, 4800 baud
Software: homebrew test, with GET and SET running on different threads
termios:
   input flags: (ICANON | ECHO | ECHOE | ISIG)
   output flags: ~OPOST
   VMIN = 0, VMAX = 255

Test sequence
-----------------

1) manually set VFO A to 7070, DATA mode (as a reference point)
2) manually changed A to 14195, USB mode
3) sent CAT to the K3 with the following two commands

	[ self set:"FA00007067610;" ] ;	
	[ self set:"MD3;" ] ;

Result: rig is properly set to 7067.61 CW.
-------

The time-stamped log shows:

2008-10-07 13:34:38.912 K3 Test[42025:10b] [SET] FA00007067610;
2008-10-07 13:34:38.913 K3 Test[42025:10b] [SET] MD3;
2008-10-07 13:34:39.824 K3 Test[42025:3303] [GOT] IF00007067610
2008-10-07 13:34:39.864 K3 Test[42025:3303] [GOT]   -000000 000300
2008-10-07 13:34:39.904 K3 Test[42025:3303] [GOT] 0001 ;IF00007067
2008-10-07 13:34:39.943 K3 Test[42025:3303] [GOT] 610     -000000
2008-10-07 13:34:39.977 K3 Test[42025:3303] [GOT] 0003000001 ;

The rig was initially set to AI1, so I see all changes echoed back in  
the form of IF packets.

I'd sent the MD command right after the FA command without checking  
for status since a separate thread is used to read the returned IF  
packets.  The read thread in this case received the IF packet after a  
little over 910 ms.  (Lots of relay clicking.)  I have seen an FA  
response come back as early as 73 ms after sending the command if it  
is within the same band.

I was hoping to find out what the FA to MD delay needs to be, but  
apparently none is needed in my test (I repeated it many times,  
without a failure).  I tried adding 10ms and 50ms worth of delay  
between the FA and MD commands, and the extra delays didn't hurt,  
either.

Please note that I have bypassed the K3 ATU.  That might change the  
results, or it might not :-).

73
Chen, W7AY