[Elecraft] A/B diversity switch

[Richard Ferch]

VE7XF wrote:
> I see that I have to approach this from the UNLINK mode -
> if I start from LINK mode, I don't get the DIVERSITY message.
> So both VFOs are tracking (with 'A' knob, decimal blinking),
> even though the 'B' frequency indication doesn't change.

Actually, in diversity mode I believe both receivers are using VFO A. 
That's why the VFO B display doesn't change; VFO B is not affected by 
the VFO A knob (the VFO A knob affects VFO B in linked mode, but not in 
diversity mode). VFO B is still controlled by the VFO B knob, and it is 
used by the transmitter in SPLIT mode, just the same as in a 
one-receiver K3.

My mental model is as follows: the VFOs and the receivers are actually 
independent. The first receiver is always controlled by VFO A, but the 
second receiver can be controlled by either VFO (A = diversity, B = all 
other modes). The transmitter may be controlled by either VFO (A = 
non-split, B = split). The VFOs each have their own control knobs, but 
in LINK mode frequency change directives from the VFO A knob are also 
fed to VFO B.

73,
Rich VE3KI