[Elecraft] K3 & 2 x Amplifiers

[Vic Rosenthal]

All you need are diodes to isolate the keyout lines going to the amplifiers. Just turn off the amp you aren't using. You can use a simple transistor switch operated by DIGOUT1 to increase the current it can provide.
I would like to see Elecraft add the ability to control all the DIGOUT lines via macro to provide more station control functionality.

Vic 4X6GP/K2VCO 

> On Aug 16, 2015, at 5:09 AM, Michael Eberle <mteberle at mchsi.com> wrote:
> 
> Hi Mike,
> 
> I'm not sure if the Key Out and key line on the Aux port are isolated or not.  At one time I had the KPA500, a tube amp, and a 2M amp for the internal transverter all connected.  I used a KRC2 band decoder connected to a couple of relays that would switch the Key Out signal among the three depending on what band I am on.  It requires some extra cabling because it needs to also needs to connect to the AUX port as well as the KPA500/KAT500.
> 
> With only 2 amps, you may be able to use a relay to switch the Key Out signal controlled by the DIGOUT 1 pin on the Aux connector. You would have to set DIGOUT 1 in the K3 config menu to 'OFF' on every band except for 6M where it would be set to ON.  You would have to make sure to use a relay small enough that it doesn't pull more current than the DIGOUT 1 pin can handle though.
> 
> 73
> Mike - KI0HA
> 
>> On 8/15/2015 5:20 PM, Mike VE3YF wrote:
>> Hi:
>> 
>> I would like to know if it is possible to hook up the KPA500 to the Antenna Port 2, use the KPAK3AUX cable and splitter cable from the K3 to KPA500,
>> and then other half of the splitter cable to the MK2R+. When in normal use the I would use Antenna Port #1, and when I want to work 6m or the KPA500
>> amp use Antenna Port #2.
>> 
>> I guess a question comes to mind, is the key out jack isolated from the keying line on the KPAK3AUX cable. I see that is being the major issue, but I am
>> sure I am not the first one to think of this possible setup. I welcome any comments etc. Tnx
>> 
>> 
>> 73 De Mike
>> VE3YF
> 
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