Keyer, Afa And Additional Audio Section Tests - NORCAL NC2030 Manual

Keyer, AFA and Additional Audio Section Tests

Attach headphones to the head phone jack. Make sure the 50K trimmer pot R93 is set to mid range. It
comes preset this way from the factory.
Apply the 9v battery voltage. Listen for the AFA and the Keyer sign on messages. The Keyer sends
"FB", while the AFA waits a few seconds and sends "2T3T". These two may overlap depending on the
keyer speed.
Press the AFA button. The AFA should send "E" followed by "00R0". Since the VFO section is not
built yet, the AFA is measuring zero frequency.
Press the keyer button. The keyer chip should send "HI".
Connect a set of paddles to the paddle jack. At this point, you should be able to exercise the keyer
(don't worry, there is no transmitter yet), and you should be able to vary the cw speed via the cw speed
pot.
Touch the three terminals of the volume control with a finger while listening to the headphones with the
volume control setting to maximum volume. If the audio section is working properly, you should hear a
faint 60 Hz "hum" from touching the volume control terminals. You should be able to very the volume
with the volume control
Vary the SCAF filter pot while touching the volume control terminals. Listen for a change in the pitch
of the noise as the cutoff frequency of the SCAF is raised and lowered.
This series of tests verifies all the circuitry that has been built thus far.
Disconnect the 9v battery supply.
Note:
The AFA and CW Keyer may not reset properly if the voltage is removed from the rig for only
a few seconds. If the chips do not reset properly, they will not send the sign on messages on power up.
If you power off the rig and want to power it back on immediately, you may need to press both the AFA
and the Keyer push buttons to make sure the processors burn up all stray charge and thus get reset
properly before turning the rig back on.
The operating instructions for the AFA and the keyer are at the end of this manual. The keyer in
particular has several memories, a beacon mode, and a straight key mode where if a straight key is
plugged in on power up (or if a paddle lever is held on power up), the keyer will disable itself and
assume an external straight key is being used. The straight key mode is determined each time the keyer
(i.e., the transceiver) is turned on.
Norcal NC2030 v5 12-18-05
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