TX/RX Offset” menu parameter.
• If the parameter “CW Side/Off Freq” is changed - which changes the sidetone/offset frequency - remember
to change the the center frequencies of the 300Hz and 500Hz filters so that the center of your receive filter
passband will match your transmit frequency. If you do not do this a station that returns to you on your
frequency may do so outside the passband of your receive filter!
• There is a slight interaction between the power setting, the perceived loudness of the sidetone gain and the
sidetone gain setting. This is a known issue, but it has not been a cause of complaints.
• Pressing-and-holding button G3 when in CW, LSB or USB mode will generate a tone that is equal in
frequency to the CW sidetone and transmit-receive offset. This may be used to “spot” the frequency so that
you can transmit on the same frequency as the station with which you are communicating. The loudness of
this tone may be adjusted using the “Adjustment Menu” option “Beep Volume”.
For a more thorough explanation of the many features of the mcHF transceiver – particularly the items in the
menu – refer to the “mcHF Operators Manual” that is found on the mcHF Yahoo Group in the KA7OEI folder
of the FILES section.
In this same folder you will also find:
• Release notes for the various software versions
• “mcHF_board_modifications” files with the recommended hardware modifications!
• Binary files
• Source code
Notes and tips about AM operation:
• AM transmit is possible only if Frequency Translate is active. If Frequency Translate is off, AM receive is
possible only if the signal is slightly “off-tuned” to avoid the “zero Hertz” hole: There are no such
restrictions when Frequency Translate is on.
• Output power is automatically limited to the “2 watt” setting when in AM mode.
• When using a “wide” filter, some DSP functions may be disabled.
• Remember that AM is a continuous-carrier mode: Your final transistor heat-sinking and power supply must
be able to dissipate the power!
Notes and tips about FM operation:
• FM is disabled by default: You must enable it in the “Configuration” menu.
• FM transmit or receive is possible only if Frequency Translate is active.
• When in FM mode all DSP functions are disabled.
• When in FM mode the “RFG” control changes to “SQL” (squelch).
• Remember that FM is a continuous-carrier mode: Your final transistor heat-sinking and power supply must
be able to dissipate the power! It is recommended that power be reduced to the minimum required for
communications.
• If it is enabled, pressing-and-holding button G4 during FM transmit will cause a tone burst to be sent.
• The “FM” indicator will turn white when the squelch is open. If tone decode is enabled, the “FM” indicator
will turn red, unless the squelch is still closed (e.g. signal noisy, squelch too “tight”, etc.)
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