Owner`s manual
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 TR N , 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 . T R N0 -9 are used with the K3’s
internal 2-m transverter option (K144XV). IN T
TRN 0 sets all band outputs to 0, while INT
TRN 1- 9 have the same decodes as TR N 1-9.
Transverter addresses are also sent to Elecraft XV-
series transverters and the KRC2 via the AUXBUS
line. Note: TR N 1- 7 are sent as 1-7, but TR N 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 H F- TR N, the
BAND0-3 outputs follow the NOR table when HF-
6 m bands are selected, and the TR N 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 H F- 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- TR N .
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.