Kenwood TS-890S Operation Manual - Page 65
Frequency Offset when Shifting from SSB to CW Mode
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COMMUNICATING AIDS 5 Adjusting the Sidetone and Pitch Frequency • During key-down in the CW mode, a tone can be heard from the speaker of this transceiver. This tone is known as a sidetone. When this tone is heard, it means it is possible to monitor the Morse code transmitted by one's own station. • In the CW mode for direct keying of the carrier, a BFO (beat frequency oscillator) is needed to convert the carrier wave into audible sound. The difference in frequency between the BFO and carrier wave can be heard in the form of a beat. This difference in frequency is called RX pitch. • Both the sidetone and the RX pitch have the same frequency. Turn the [MIC/PITCH] control. Configure to a sidetone frequency that can be heard most clearly. Turning the [MIC/PITCH] control to the right increases the frequency, while turning the control to the left decreases it. Setting Value 300 to 700 (default) to 1100 [Hz] (5-step) Adjusting the Sidetone Volume Configure in Menu [1-02] "Sidetone Volume" Setting Value Off/ 1 to 10 (default) to 20 (1 step) ● Sidetone volume like the playback volume of the CW message cannot be altered using the [AF] control. CW Rise Time The rise time of CW refers to the time interval from key-down to the point where the output waveform reaches the highest peak. Configure in Menu [5-15] "CW Rise Time" Setting Value 1/ 2/ 4/ 6 (default) [ms] • The default setting (6 [ms]) is suited for low-speed to medium-speed keying. For high-speed keying, configure to "4 [ms]", "2 [ms]" or "1 [ms]". Auto Zero-in (CW Auto Tune) This function automatically tunes the TX frequency to coincide with the RX frequency of the target station in order to communicate with a station receiving in the CW mode. 1 Turn the Tuning control and adjust roughly until the RX audio of CW can be heard. 2 Press [CW T.] to set auto zero-in (CW auto tune) to ON. ● Using auto zero-in (CW auto tune) allows tuning up to ±50 Hz from the RX frequency of the target station. ● Auto zero-in (CW auto tune) may not be successful when the keying speed at the receiving station is slow, when there is interference or when the signals are weak. ● When RIT is ON, auto zero-in (CW auto tune) functions with respect to the frequency shifted using RIT. ● The operable range of auto zero-in (CW auto tune) varies depending on the status of reception. For example, if the DSP filter width is 500 Hz, auto zero-in (CW auto tune) will function with respect to RX signals within an approximate RX pitch frequency range of ±300 Hz. CW BFO Sideband This is a function for switching CW (USB) and CW-R (LSB) with CW (LSB) and CW-R (USB). Example: Set the CW carrier point to LSB so that the CW RX tone rises at the same time when the frequency is raised. Configure in Menu [5-05] "CW BFO Sideband" Setting Value USB (default)/ LSB CW Automatic Transmission from SSB Mode When the menu below is configured to ON and paddle or key-down of the electronic keyer is performed during operation in the SSB mode, the SSB mode switches automatically to the CW mode and transmission is enabled in the CW mode. The mode switches automatically from USB to CW or LSB to CW-R. • Upon shifting from the SSB mode to the CW mode, carrier frequency offset will function even when "Carrier Frequency Offset (SSB Mode to CW Mode)" is set to OFF. For this reason, to call a station that transmitted a CW after the CW is received during operation in the SSB mode, this can be done easily using the paddle or electronic keyer operation. Configure in Menu [5-06] "Automatic CW TX with Keying in SSB Mode" Setting Value Off (default)/ On • Menu [5-06] "Automatic CW TX with Keying in SSB Mode" does not function during transmission and when in the split mode. Frequency Offset when Shifting from SSB to CW Mode Upon switching to the CW mode to communicate with a station that transmitted a CW after the CW signal is received during operation in the SSB mode, it is usually necessary to correct the frequency by turning the Tuning control slightly. However, turning on this function enables the frequency to be corrected automatically. Configure in Menu [5-07] "Carrier Frequency Offset (SSB Mode to CW Mode)" Setting Value Off (default)/ On . • > starts to blink. • The TX frequency is automatically adjusted to match the RX frequency of the target station, and the pitch of the RX signal coincides with the sidetone and RX pitch frequency. • After auto zero-in (CW auto tune) has ended, > disappears. If auto zero-in (CW auto tune) cannot be started up, the frequency is restored to the original value. 5-9