K3 Diversity Reception Question

[Mike Scott-7]

Is there one or two local oscillators in a two receiver K3?

I have been puzzling over the stated ability of the K3 to achieve diversity
reception (single signal two independent antennas). For this to work I
believe that the subreceiver 8+ MHz local oscillator and the DDS VFO must be
in phase lock with the main receiver.

I think I read that the subreceiver DDS VFO can be slaved to the main
receiver and I assume this means the two VFOs can be in phase lock.

I have not read anything about phase locking the local oscillator of the sub
receiver to the main receiver or if a single local oscillator is common to
both receivers. If this isn't the case diversity reception won't work
properly unless the phase difference of the two local oscillators is
possibly compensated for in the signal processing chain.

Mike Scott

AE6WA
Tarzana, CA

Elecraft KX1
40M Inverted V
20M Dipole

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[Bill VanAlstyne W5WVO]

Hi Mike,

This was asked and answered three days ago on-list, and is now on the K3 FAQ:

> Q: Is it possible to phase lock the two K3 receivers?
> A: They run off the same reference oscillator and are phase locked.

There is also at least one other FAQ item addressing diversity recpetion.

Bill / W5WVO


Mike Scott wrote:

> Is there one or two local oscillators in a two receiver K3?
>
> I have been puzzling over the stated ability of the K3 to achieve
> diversity reception (single signal two independent antennas). For
> this to work I believe that the subreceiver 8+ MHz local oscillator
> and the DDS VFO must be in phase lock with the main receiver.
>
> I think I read that the subreceiver DDS VFO can be slaved to the main
> receiver and I assume this means the two VFOs can be in phase lock.
>
> I have not read anything about phase locking the local oscillator of
> the sub receiver to the main receiver or if a single local oscillator
> is common to both receivers. If this isn't the case diversity
> reception won't work properly unless the phase difference of the two
> local oscillators is possibly compensated for in the signal
> processing chain.
>
> Mike Scott
>
> AE6WA
> Tarzana, CA
>
> Elecraft KX1
> 40M Inverted V
> 20M Dipole
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
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[Eric Swartz - WA6HHQ]

Hi Mike,

The synthesizer in the second RX is locked to the same TCXO reference as
the primary K3 rx.

73, Eric  WA6HHQ

Mike Scott wrote:

> Is there one or two local oscillators in a two receiver K3?
>
> I have been puzzling over the stated ability of the K3 to achieve diversity
> reception (single signal two independent antennas). For this to work I
> believe that the subreceiver 8+ MHz local oscillator and the DDS VFO must be
> in phase lock with the main receiver.
>
> I think I read that the subreceiver DDS VFO can be slaved to the main
> receiver and I assume this means the two VFOs can be in phase lock.
>
> I have not read anything about phase locking the local oscillator of the sub
> receiver to the main receiver or if a single local oscillator is common to
> both receivers. If this isn't the case diversity reception won't work
> properly unless the phase difference of the two local oscillators is
> possibly compensated for in the signal processing chain.
>
> Mike Scott
>
> AE6WA
>
>  

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