[1000mp] 60M/Why??

[Joe Subich, K4IK]

Ross writes: 

> Actually, I often turn on my MarkV Field and start using it almost
> immediately. I have never noticed any drift of any consequence...
> perhaps a cycle or two at the most after an hour. The standard 
> TCXO of .5PPM does a good job in a standard home environment (no 
> huge temperature extremes).

With the EDSP modulation set to 300-3100 (menu 7-7 SSb-t) one could 
be +/- 50 Hz from nominal [(2800-2700)/2] and still be within the 
specified channel.  50 Hz at 5 MHz is 10 ppm!

With the 2.4 KHz TX EDSP filter (menu 5-9 t-FiL) set to 2.4 KHz 
one can be +/- 200 Hz from nominal [(2800-2400)/2] and still within 
the specified channel.  200 Hz at 5 MHz is 40 ppm!

As long as the TXCO is properly aligned to 10 MHz, I doubt that 
its stability will be an issue.  Now, if the user is a lid who 
cranks up the processing and/or overdrives rig's finals causing 
excessive spatter and IMD, that's a different matter. 

73, 

   ... Joe, K4IK