Drv Terminal - Kenwood TS-990S In-Depth Manual

TRANSMISSION 04
Fig. 35 Connection Block to an External Device for ALC Signal Input
Fig. 36 Change of DRV Output Level by the ALC Voltage
● Operation on an ALC Signal Input from an External Device
If the microphone gain and carrier level are adjusted to optimize the ALC meter needle deflection while no ALC signal is
present from an external device, applying an external ALC signal results in more feedback control for the ALC. Therefore,
the increase causes the ALC meter needle to deflect wider. In that case, rotate the [PWR] knob counterclockwise while
viewing the ALC meter needle deflection or readjust the microphone gain and carrier level.

DRV Terminal

The output level from the DRV connector is approximately 0 dBm (1 mW). Depending on the configuration for the
transmit power, the output level can be lowered to approximately 1/20. To make the output level lower, rotate the [CAR]
knob in CW, FSK, PSK, or AM mode, or rotate the [MIC] knob (microphone gain) or [PROC OUT] knob (speech
processor output level) in SSB mode. The level for the output signal from the DRV connector is insufficient to be
transmitted directly through an antenna. Operation with a transverter or connection to the high‑gain linear amplifier
allows operation in each amateur band including the 135 kHz band.
The following graphs show the spurious response in the 14 MHz band and spurious response in the 135 kHz band on the
DRV connector. The harmonic level also changes upon change of the level to 0 dBm, ‑10 dBm, and ‑20 dBm.
DRV outputs not passing through a low‑pass filter may include a lot of harmonic components. For transmission,
eliminate such harmonic components through a low‑pass filter as needed after signal amplification. Alternatively,
lowering the level for the transmit power configuration or applying the ALC signal from the REMOTE connector to limit
the DRV connector output level can reduce distortion.
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