microHAM micro KEYER 2R Manual page 45

Some tips from Geoff Anderson, G3NPA:
TIP: If you have achieved the correct settings for the transmit levels, you will see that
changing from the PSK tuning tone to typing text, will make the transmitter power swing
from 50% (no typing) to 100% (typing or tuning-tone) 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 overdriving 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: Although it is a common belief to the contrary, it is in fact quite alright to let the
transmitter ALC line operate on PSK31. The ALC line will control the drive level without
clipping in the same way that it does on voice operation.
TIP: Don't fall into the trap of thinking that because the transmit signal on the waterfall looks
good that your actual signal is OK. All the waterfall is showing during transmit is the local
audio and NOT the resultant transmitted signal.
RX RECORDING/DIGITAL (audio recording or digital decode levels).
VU meter: this "stacked LED" displays show the audio level into the
analog to digital controller. Please note, display shows level only if a
sample rate is selected.
MK2R+ does not have software controls for input level because are
not necessary - input level is adjusted with the front panel
RECORDING/DIGITAL pots.
If your software tries to control the input level of USB Audio CODEC
this attempt will fail with an error message. Please ignore this
message, USB Audio CODEC does not have software sliders for
recording input channel.
MK2R shows sliders for the sound card line in. Keep the inputs at
about 80-90% and use front panel pots for adjustment. When
correctly adjusted, the input signal should never reach RED level.
Sample Rate: sets the sample rate used for the RX level displays.
Because of the nature of the Windows sound system, it is best to
set the sample rate to a multiple of the sample rate (or "clock rate") of your applications. For example,
since MMTTY, MMVARI and MMSSTV default to a 11025 clock, 11025, 22050 or 44100 Hz sample rates
are appropriate for use with MMTTY/MMVARI/MMSSTV. Similarly, PSKcore (used by many logging
programs for PSK support) uses 48000 Hz sampling so 8000, 16000, 32000 and 48000 Hz sample rates
work best with applications based on PSKcore.
microHAM © 2006 All rights reserved
45