Kenwood TS-990S In-Depth Manual page 35

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Furthermore, the TCXO has a short start‑up time (400 ms or lower for the 10 MHz reference signal output) to operate

following the ambient temperature, the TS‑990S can be used immediately even if it is not energized while the TS‑990S is

not in use.

Considering the reference frequency generator circuit characteristics and global energy‑saving approaches, the TCXO

is employed for the TS‑990S. If higher accuracy and stability than those present by the reference frequency generator

circuit is demanded, enter a 10 MHz (‑10 to +10 dBm) reference signal to the REF I/O connector from an external

reference oscillator. With this, the frequency accuracy of the external reference oscillator is applicable to the operation.

Also, the 10 MHz reference signal with the accuracy of the reference frequency generator circuit of the TS‑990S can be

generated from the REF I/O connector.

To enter the reference signal to the REF I/O connector, select "Input" from Advanced Menu 4 "REF I/O Connector

Configuration". To generate the TS‑990S reference frequency from the REF I/O connector, select "Output" from

Advanced Menu 4.

1 MHz Reference Output Time

(from power key voltage detected)

Fig. 52 REF I/O Output Starting Characteristics

LOCAL OSCILLATIOR 05

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