[Elecraft] K2 - KRC2 - Yaesu FL7000 Amp

[Doug Faunt N6TQS +1-510-655-8604]

I don't know what the FL7000 requires, but it can probably be produced
simply from the Accessory connector.

   From: "FISCHER,GREG" <ab7r at cablespeed.com>
   Date: Wed, 09 May 2007 08:07:12 -0500

   Hi Raj.

   This is from the FAQ page:

   Do I need the KRC2 option for my future K3 to band switch 
   my non-Elecraft amp automatically?

   At least initially. We may provide other popular control 
   protocols later.

Note pins 3, 9, 13, and 14 on the Accessory connector.  This means you
DON'T NEED the KRC2 for many purposes.  For instance, I want to have
my IC2KL follow the band switching on my K3.  The KRC2 doesn't provide
the necessary voltage level signal without external components but a
simple MUX and resistor network connected to those four pins on the K3
will do that.  Many setups actually use BCD encoded band signals, just
like the K3 supplies.

The KRC2 is necessary for the K2, since the only band data is on the
AUXBUS, but it's probably not necessary for the K3 for most uses.

73, doug

>From the FAQ:
>What is the pin-out for the DE-15 Accessory connector?
>1 - DIG0 FSK? software definable TTL digital input (5V MAX!)
>2  - AUXBUS
>3  - BAND 1 Output (TTL)
>4  - PTT input (in parallel with MIC jack PTT )
>5  - COMMON (via 100 uH choke)
>6  - DIG Out 0 (software definable TTL digital output)
>7 -  DIG1 Input software definable TTL digital input (5V MAX!)
>8 -  POWER (pull to ground with open collector or switch to turn K3 ON)
>9 -  BAND 2 Output (TTL)
>10 - KEY input (in parallel with KEY jack on rear apron)
>11 - DIG Out 1 (software definable TTL digital output)
>12 - COMMON (via 100 uH choke)
>13 - BAND 0 Output (TTL)
>14 - BAND 3 Output (TTL)
>15 - ALC input (0 to +5V MAX)