[Elecraft] Externmal ATU

[Joe Subich, W4TV]

 > Joe - The problem is that now you'll transmit at full power when you
 > key the radio.  Not good for most external autotuners.  And probably
 > not wonderful for the K3 output when playing into a relay-switched
 > autotuner at full power.

The Quadra uses F-Set for adjusting its internal tuner and is spec'd
to require at least 70W for F-Set to operate.  If a "full power" auto-
tuner can't handle 70 Watts while tuning there is a problem.

The K3 should certainly be able to handle a relay-switched tuner on
short-term tuning without a problem ... it certainly does with the
KAT-3.

73,

    ... Joe, W4TV

On 8/24/2010 11:52 AM, Phil & Debbie Salas wrote:
> "Phil.
>
>   >  The problem is that the K3 needs an external input to put it in the
>   >  TUNE mode.  I have the KAT3, but I need an external autotuner for
>   >  use with my ALS-600 amp.  So I have this same issue with my MFJ-998
>   >  autotuner.  The MFJ-998 puts out a control signal (ground) before it
>   >  starts tuning to automatically put a transceiver into a CW TUNE mode.
>
> I believe you will find the (Straight) Key input will provide a carrier
> in any mode if you turn on "CW in SSB" and enable VOX.  It has been
> used that way with the Yaesu Quadra which requires a carrier for its
> F-Set function.
>
> 73,
>
>      ... Joe, W4TV"
>
> Joe - The problem is that now you'll transmit at full power when you key the
> radio.  Not good for most external autotuners.  And probably not wonderful
> for the K3 output when playing into a relay-switched autotuner at full
> power.  I like the way so many other radios do it whereby the input from the
> external tuner puts the radio in a low-power TUNE mode.
>
> Phil - AD5X
>
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