[Elecraft] RX In/Out for External Filter

[Joe Subich, W4TV]

 > There is no jumper on the K3, so how does it know there is a filter
 > there?

Select RX ANT.  If you check either the schematics or block diagram,
you will see that selecting RX ANT will route the RF line from the
TR switch *out* the RX OUT jack at the same time the RX IN jack is
selected.

73,

    ... Joe, W4TV


On 12/5/2013 6:46 PM, Ken Widelitz wrote:
> The manual indicates you can "patch in" a narrowband filter between the RX
> In/Out.
>
> When I did this with other radios, I had to remove the jumper between the RX
> In/Out and insert the narrowband filter. There is no jumper on the K3, so
> how does it know there is a filter there?
>
> The application is for a filter for the bottom of the 10 meter CW band so I
> can use the other radio high in the CW band or for SSB.
>
> 73, Ken, K6LA / VY2TT
>
>
>
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