Elecraft K3 Owner's Manual - Manual (Page 19)

19
Band Outputs (BAND0-BAND3)
BAND0-3 provide band selection signals. Their
behavior is controlled by the CONFIG:KIO3 menu
entry (see below). Band data is based on VFO A.
Earlier K3s may require external pullup
resistors to 5 V on these lines, typically 2.2-10K.
In tables below, 0 = 0 VDC, and 1 = 5 VDC.
With CONFIG:KIO3 set to NOR , the BAND0-3
outputs are mapped based on the selected HF-6 m
band as shown below. On Transverter bands,
BAND0-3 will all be set to zero.
Band BAND3 BAND2 BAND1 BAND0
160 m 0 0 0 1
80 m 0 0 1 0
60 m 0 0 0 0
40 m 0 0 1 1
30 m 0 1 0 0
20 m 0 1 0 1
17 m 0 1 1 0
15 m 0 1 1 1
12 m 1 0 0 0
10 m 1 0 0 1
6 m 1 0 1 0
If CONFIG:KIO3 is set to TRN , BAND0-3 reflect
the parameters of the CONFIG:XVn ADR menu
entry, as shown below. On HF-6 m they’re set to 0.
Addresses
INT . TRN0 -9 are used with the K3’s
internal 2-m transverter option (K144XV). INT
TRN 0 sets all band outputs to 0, while INT
TRN 1-9 have the same decodes as TRN 1-9 .
Transverter addresses are also sent to Elecraft XV-
series transverters and the KRC2 via the AUXBUS
line. Note:
TRN 1-7 are sent as 1-7, but TRN 8 and
TRN 9 are sent as 0.
ADR BAND3 BAND2 BAND1 BAND0
TRN 1 0 0 0 1
TRN 2 0 0 1 0
TRN 3 0 0 1 1
TRN 4 0 1 0 0
TRN 5 0 1 0 1
TRN 6 0 1 1 0
TRN 7 0 1 1 1
TRN 8 1 0 0 0
TRN 9 1 0 0 1
With CONFIG:KIO3 set to HF- TRN , the
BAND0-3 outputs follow the NOR table when HF-
6 m bands are selected, and the TRN table when a
transverter band is selected.
Transverter Control
Normally, when the K3 is turned on, a 5-VDC logic
signal appears on ACC pin 7 (K3 ON). This could
be used with Elecraft XV transverters as an enable
signal (pin 8 of J6 on the transverter).
However, pin 7 can alternatively be configured as a
transmit inhibit input line for use in multi-
transmitter stations. (See TX INH, below.) In this
case it is not available as a power-on signal for
Elecraft transverters. Instead, the K3’s 12-VDC
switched output could be used for transverter ON.
For transverter keying, you can use KEYOUT-LP
signal (pin 10 of the ACC connector) or the KEY
OUT jack (RCA).
With KIO3 set to TRN or HF- TRN , the DIGOUT0
line (ACC, pin 6) will output 0 V when low power
mode is selected for the current transverter band
(CONFIG:XVn PWR). At all other times,
DIGOUT0 will be floating (Hi-Z).
The K3’s BAND0-2 outputs emulate the
Elecraft K60XV’s XVTR0-2 signals when
CONFIG:KIO3 is set to
TRN or HF- TRN .
However, BAND0-2 on the K3 are open-drain
signals, while XVTR0-2 on the K60XV are TTL.
TX INH (Transmit Inhibit Signal)
Pin 7 of the ACC connector can be configured as a
transmit inhibit input by setting CONFIG:TX INH
to
LO= Inh (or HI= Inh ). Holding pin 7 low (or
high) will then prevent transmit. An external 2.2 to
10 K pull-up resistor (to 5 VDC) is required.
If TX INH is set to OFF , pin 7 reverts to its
default output function, K3 ON (see above).
Elecraft KRC2 Universal Band Decoder
An Elecraft KRC2 can be used with the K3 to
perform station switching functions; it includes sink
and source drivers for all bands. The KRC2 uses the
AUXBUS rather BAND0-3 (see CONFIG:KRC2
for 6-meter band mapping). Refer to the KRC2
instruction manual for more information.