Spectrum DSP M2 User Manual page 27

Configuration of the Spectrum DSP for CW operation:
Connect a key or paddle to jack J2 on the RF board: This is the connector next to the
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DC power input.
For connecting a paddle for Iambic keying:
The TIP of the connector is DIT.
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The RING of the connector is DAH.
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Note: The "dit" and "dah" may be swapped using the "CW Paddle Reverse" menu
setting.
For connecting a straight key, mechanical semi-automatic key (e.g. a "bug") or an external
keyer/computer:
The RING of the connector keys the transmitter.
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Note that the DAH/Straight Key connection is the same as the "PTT" line on the
Microphone connector.
Now, press the MENU button (F1) and use the NEXT and PREV buttons (F4 and F3,
respectively) to navigate to the screen containing the menu item "CW Keyer Mode", noting
the setting to the right of it. The three possible settings are:
IAM_A – Iambic mode "A". Using paddles, alternate dots and dashes are sent with
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both paddles are depressed, stopping with the last dot or dash that was sent while the
appropriate paddle was depressed.
IAM_B – Iambic mode "B". The same as mode "A" except that keying continues by
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sending one more element – a dot if the paddles were released during a dash and
vice-versa.
STR_K – Straight Key. This would be used for a straight key, a "bug"or external
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keyer/computer.
Additional items on this menu (you may need to scroll to another screen using ENC2) include:
CW Paddle Reverse – This reverses the DIT and DAH positions of the paddle,
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affecting ONLY the IAMBIC modes when using the built-in keyer.
CW TX->RX Delay – This sets the delay, after the last CW element, before the
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transceiver returns to receive mode.
CW Side/Off Freq – This sets the offset frequency and sidetone in CW operation,
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adjustable in 10 Hz steps.
Note: If the sidetone frequency is adjusted, the center frequencies of the 300
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Hz and 500 Hz filters should be adjusted to compensate to keep the frequencies
within the center of the filter passband!
The parameters CW Keyer Speed and CW Sidetone Gain are adjustable from the
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main display and will be discussed shortly.
CW Freq. Offset – This sets the display/shift mode to be used for CW operation: For
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more details on this parameter, see the MENU section.
Spectrum DSP M2 User Manual V1.1
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