[Elecraft] Elecraft K1 Kit Enhancements

[Wayne Burdick]

Based on feedback from customers, we've made a number of minor changes
to the K1 transceiver kit that will make it even easier to build and
align. We've been shipping the revised kit (manual revision F) for about
a month.

Changes include:

- simpler transmit offset alignment, thanks to the addition of a 
  small slide switch on the bottom of the RF board that turns the 
  transmit carrier oscillator on/off

- addition of a jumper block for selecting the source voltage
  for the RF detector (RF board or KAT1 antenna tuner), making it easier
  to install or remove the KAT1 option or align new filter boards

- RF board updated to incorporate all required changes and added components

- attenuator on/off audio artifacts eliminated

- VFO potentiometer tuning linearity improved

- owner's manual completely updated to reflect the new 4-band 
  version of the K1

We'd like to thank everyone who built the K1 and sent us manual
corrections and suggestions over the past year.

73,
Wayne, N6KR
Eric, WA6HHQ