Choose  Window   External Devices   Amplifiers  to open the window for managing your amplifiers.

You can use SkookumLogger to monitor the on/off state and the operate/standby state of an amplifier and to control drive power. Amplifier 1 is associated with Radio 1 and similarly for Amplifier 2. 

Except for the ACOM 2000A, the  Power On  button can toggle the amplifier power on and off, and the  Mode  button can toggle the amplifier between  Standby  and  Operate . For the KPA1500, the  Tune ATU  button starts the tune process for the amplifier and the bar graph displays amplifier forward power with 25 dBm tick marks between 45 dBm and 65 dBm.

The primary role of the amplifier interface is to control drive power based on whether the amplifier is in operate mode or standby mode. To do this, SkookumLogger needs to be able to read and set the transmit power level of your radio. You can define drive powers for each amplifier type, for each amplifier mode, for each contest band, and for each radio mode. The default drive powers are 25 W for operate mode and 100 W for standby mode.

To define a drive power setting, set the radio band, mode and transmit power level, then tap the  Save Drive Power  button. To enable SkookumLogger control of drive levels, turn on the  Automatically set drive power  option. The  Track Radio  applies to the KPA1500 amplifier. When enabled, SkookumLogger sends the radio transmit frequency to the amplifier to select the appropriate ATU settings without transmitting.

The Elecraft K3 or K4 with either the KPA500 or the KPA1500 combination does all of this automatically, and also changes the amplifier band when the transceiver changes bands. For these radio-amplifier combinations, you should uncheck the option  Automatically Set drive power  and the 3 options.

If you want to use drive power management without a serial connection to an amplifier, choose the Phantom amplifier type.

Another role of the amplifier interface, for the ACOM 2000A only, is preemptively changing the ATU segment within a band when the radio transmit frequency changes to a new frequency that would cause a segment when transmitting begins. There is no configuration needed for this role. 

Note:   If you use  Automatically set drive power  with the ACOM 2000A, you should disable the RCU-programmed amplifier option that causes the amplifier to automatically return to OPR mode following any STDBY period initiated by a “soft” fault.  Otherwise, it is possible that the amplifier will switch to OPR while an in-process message (such as from an F-key) is delivering RF from the transceiver at the level you have previously set for the amplifier’s STDBY mode, thus potentially overdriving the amplifier tube grids and triggering one or more faults, including total amplifier shutdown.  Alternatively, do not use  Automatically set drive power

Also see:

Type Choosers

Port Choosers

SkookumLogger  3.13  © 2023 K1GQ