I have an Elecraft K3. Does the HL-1.5 and HL-2.5 track the band data output of the K3?
Yes, the BCD band data output of the K3 looks just like the BCD band data output of Yaesu transceivers, and so the HL-1.5 and HL-2.5 amplifiers will decode and track the band changes of the Elecraft K3. You will need a cable that connects to the K3 HD15 accessory connector to bring out the band data and ALC interfaces connections from the K3. Array Solutions makes the K3THP1 and K3THP2 cables for the HL-1.5 and HL-2.5 amplifiers, respectively. There is also a K3THP3 cable which just brings out the K3 ALC interface for the HL-1.1 and HL-1.2 amplifiers. Early K3 transceivers had only open-drain band data outputs, and the K3 ALC input was not compatible with the standard -4VDC ALC standard. Beginning with K3 serial number around 2370 (and deliveries beginning in December 2008), the band-data outputs are now TTL compatible and the ALC input voltage range has been corrected. Elecraft has also published an official modification for both of these issues (see K3 mods at www.elecraft.com). Inci
