microHAM Digi Keyer II Instruction Manual page 28

TX VOICE/DIGITAL (transmit levels)
These controls adjusts the output (transmit) levels. If the channels are active, the
green rectangle will be on. If not, click the TX Mixer button and unmute the master
Volume (Speaker) and Wave controls.
There are two (or four) sliders, the WAVE slider and MASTER slider (the Master
Volume or Speaker control).
As a starting point, set the MASTER level to about 80% and the WAVE level to about
50%. Adjust WAVE for proper drive when using digital modes. Adjust the MASTER
only if necessary to keep the WAVE control from operating at one end of its range.
NOTE: To enable P-FSK or Q-CW audio keying on the right channel, the right
channel MASTER and WAVE sliders must be at 100%. Any value below 90%
for the RIGHT sliders will not allow the detector to operate properly.
Test Signal: causes DIGI KEYER II to output a 1500 Hz audio tone for setting the
transmit output level for AFSK digital modes.
TX Mixer: this button opens the Windows Volume Control (Playback Mixer) for the
selected sound card.
Some tips from Geoff Anderson, G3NPA:
TIP: If you have achieved the correct settings for the transmit levels (with audio
compression disabled), changing from a single tone to the PSK idle should make transmit
power drop by at least 50% as observed on an RMS or average reading meter. This
change in power is correct. If you do NOT see a 50% (or more) change, you are probably
over driving the radio. Please note that some radios have inbuilt power meters which give
a PEAK reading and therefore the change in level discussed above will not be observed.
TIP: Don't fall into the trap of thinking that because the transmit signal looks good on the
waterfall that your actual signal is OK. All the waterfall is showing during transmit is the local
audio and NOT the transmitted signal.
RX RECORDING/DIGITAL (digital decode levels).
VU meter: this "stacked LED" display shows the audio level into the analog to
digital controller. Note, the display is active only if a sample rate is
selected.
DIGI KEYER II shows one slider for each input – Left for the Main RX and Right
for the Sub RX. Keep the sliders at about 80% and use the RX Main and RX
Sub pots on the front panel for adjustment. When correctly adjusted, the input
signal should never show RED.
Sampling: sets the sample rate used for the RX level displays.
Because of the of the way the Windows sound system handles multiple
access to the sound card, always turn off the level displays (set
Sampling: off) when they are not in use.
Rec/RX Mixer: this button opens the Windows Record (Input) Mixer for the
selected sound card.
Get ID: this button will retrieve the name and number of the sound card. The
name can be used to verify that the correct sound card has been selected. The
Wave In ID can be used to configure software that identifies sound cards only by number.
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