[Elecraft] K2 and Linearamp UK 811

[G3SJJ]

Ian, yes it is as simple as that. Phono to phono cable.

Look at page 65 of the KPA100 manual, centre left, you will see J7 and 
the switching transistor. The main thing is that the amp shouldn't 
exceed the device's parameters, page 59. 200V DC and 1 amp.

Put your DVM across the amp phono socket and measure the open cct 
voltage, I would guess between 30 and 100v, then put DVM into current 
mode and measure closed cct current, again maybe around 70-100 mA.  
(This will obviously switch the amp on.)

Off you go and work some DX!! Email me off list if you need more info.

73 Chris G3SJJ



Don Wilhelm wrote:

    Ian,


    Check the voltage, current and polarity of the 811 amplifier PTT
    signal and compare those to the rating for the KPA100 maximum
    ratings. If the 811 amp requirements fall within the ratings of the
    KPA100 amp keying output, then just connect them together and run.

OK, well the amplifier instructions simply state that the phono socket 
(on the 811), when earthed by the transceiver, puts the amplifier into 
TX mode. The amp does have an ALC socket but I guess I can ignore that. 
So my question is, when I key the KPA100 via the K2, will the key output 
send a ground to the amp PTT input?
Sorry to sound so thick, I have not dealt with large amps before.

73 Ian