[Elecraft] Re: in-box SO2R?

[wayne burdick]

On Apr 29, 2007, at 1:26 AM, Chris Page wrote:

> Re Wayne's comment about SO2R, can you operate true SO2R with the K3,
> ie listen on one band at the same time as you tranmit on another
> band?

You could certainly listen on one band and transmit on another, but the 
T-R circuitry would have to be activated on both receivers, blanking 
them during keying.

Full duplex might be possible at very low power (I haven't tried it 
yet), but certainly not at full power. In-box SO2R would probably 
require very extensive shielding that would have completely blown our 
cost, size, and weight budgets.

Also, interestingly, we talked to a lot of SO2R ops who said that 
in-box SO2R was not that great an idea. User interface issues get very 
tricky, and there are T-R problems. For example, if you were trying to 
switch between 40 and 20 meters, the low-pass filter relays would have 
to be switched every time you key the rig. While this can be done, I 
wouldn't recommend doing fast QSK this way. The LPF relays are pretty 
beefy! It's even more dicey if you're trying to switch the ATU network 
between the two bands at CW keying speeds.

73,
Wayne


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