9
Computer/Amp Keying (ACC)
The 3.5 mm accessory jack (ACC) facilitates firmware
updates and remote control of the KX2 via a computer,
and/or connection to an Elecraft KXPA100 amp. In
either case, a standard stereo plug can be used (see
sleeve, ring 1, and tip connections below). The
supplied KXUSB cable can be used for this purpose.
* For external ampflier keying, the ACC jack’s key out
signal (on Ring 2) may also be needed, as described at
right. In this case a 4-circuit (TRRS) plug is required.
Computer Applications
KX2 Utility is required for firmware configuration and
updates (pg. 34). The utility program also provides a
CW/data terminal function. Our Elecraft Frequency
Memory Editor can be used to set up frequency
memories.
Many logging, contesting, and control programs are
available from third parties. If the KX2 is not
specifically supported, try using Elecraft KX3 or K3.
Amplifier Keying
The ACC jack provides a key out signal (Ring 2
contact, shown at left). Key out goes low during
transmit, and can be used for transmit/receive
switching of linear amplifiers and transverters. For
keyline voltage and current limits, see Specifications.
If the key out signal is not required, a regular stereo
plug can used (3-circuit). This will short the key out
signal to the sleeve (ground), but will not cause any
damage or consume additional current.
An Elecraft KX2 Accessory Cable (KX2ACBL) can
be used to break out the computer control and key out
signals separately. These can then be connected to both
an Elecraft KXPA100 ampflier via its supplied cable.
Auxiliary Outputs (AUX)
If the KX2 is fitted with a KXIO2 (pg. 33), then a 2.5
mm AUX jack will be available. This jack provides
two general-purpose outputs that can be programmed
on a per-band basis to control equipment such as an
antenna switch or transverter. On the connector, the
sleeve is ground, tip is AUX 1, and ring is AUX 2.
Program/Test (PGM)
This jack is reserved for Elecraft factory test use.
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