(K3) two K3's operating on same band

[RobertG]

Two questions re contest hardware setups:

I have regularly read comments from various contest operations to the
effect that two K3's can be operated on the same band [with common sense
frequency separation]. This is due to the rig's excellent ability to
reject adjacent channel signals. Any comments on this point?

Assuming such operation is possible, does this require separate antennas?

If the same antenna can be used for two rigs, how is this configuration
set up? I can recall doing something like this with radar, 50 years ago,
but I wouldn't bet a lot on it.

Thanks to all

...robert
--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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[Jim Brown-10]

On Wed,5/13/2015 8:16 PM, Robert G Strickland wrote:
> Two questions re contest hardware setups:
>
> I have regularly read comments from various contest operations to the
> effect that two K3's can be operated on the same band [with common
> sense frequency separation]. This is due to the rig's excellent
> ability to reject adjacent channel signals. Any comments on this point?
>
> Assuming such operation is possible, does this require separate antennas?

Absolutely!  At home, I have two towers about 200 ft apart, one with a
3-el SteppIR,the other with monobanders for 20 and 15, and a 10M
monobander on a low pushup mast. If I carefully orient them so that the
are approximately in line, (that is, pointing them in a direction that
puts at 90 degrees to the other, I can run two K3s on the same band with
each driving a Ten Tec Titan to 1500W.  I can NOT do that if one antenna
points to the other one. :)

On CQP county expeditions, we run CW and SSB on the same band each with
a K3 driving a KPA500. Separation is roughly 200 ft on 20-10, and about
300 ft on 80 and 40, and those antennas are all carefully located so
that when aimed to the east coast, they are inline as described.

73, Jim K9YC
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[Bill Frantz]

Like Jim, the WVARA field day operation runs multiple K3s on the
same band. We often have a SSB, CW and digital station all on
the same band. Two important differences:

  We run QRP.
  We often run several bands on the same antenna with a splitter.

As far as I know, you need separate antennas for each radio. You
might be able to use the same antenna if you had 120+db filters
ala VHF/UHF repeaters.

73 Bill AE6JV

On 5/14/15 at 8:16 PM, [hidden email] (Robert G Strickland) wrote:

>I have regularly read comments from various contest operations
>to the effect that two K3's can be operated on the same band
>[with common sense frequency separation]. This is due to the
>rig's excellent ability to reject adjacent channel signals. Any
>comments on this point?
>
>Assuming such operation is possible, does this require separate antennas?

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