Those levels are the MAXIMUM drive that should be used with each
corresponding jumper settings.
Once the jumpers are set, the Input Attenuator pot can be adjusted to
set the desired output power.
If set for the +39 dBm input, the attenuator is inserted into the 28 MHz
transmit path and the 28 MHz gain stage Q6 is bypassed.
The +24 dBm setting bypasses both the attenuator and the Q6 stage.
The 0 dBm setting inserts the Q6 gain stage and bypasses the attenuator.
If one is concerned about heat from the 3 watt resistors in the
attenuator, it is only a problem when the +39 dBm input level is selected.
If one is using a K3 with the KXV3 (or KXV3A), set the jumpers for the 0
dBm max input, set the chosen K3 XVn PWR menu parameter to L 1.00 and
set the XV144 JP1 to pins 1-2 and JP2 to pins 2-3 (for separate TX and
RX coax on the 28 MHz IF).
Then transmit with the K3 power set at 1 mW and adjust the XV144 Input
Attenuator pot for 20 watts output. The K3 power knob will then control
the drive to the XV144 and thus the desired output level.
73,
Don W3FPR
On 7/26/2014 11:21 AM, John Lawrence via Elecraft wrote:
Hi Jim
The version of the manual I have clearly shows on page 8 the three levels in mw
and watts based on jumper settings.
And Appendix C Page C-1 again gives the details and jumper settings for the
tree levels, up to 0dBm, +24 dBm and + 39 dBm.
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