Yaesu FT-847, Руководство по эксплуатации

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102
FT-847 O
PERATING
M
ANUAL
H
IGH
-S
PEED
CW M
ETEOR
S
CATTER
(HSCW MS) O
PERATION
Configuration of the FT-847 for High-Speed CW
Meteor Scatter (HSCW MS) operation at CW sending
speeds at 1000 lpm (letters per minute) or more is eas-
ily accomplished, using the connectors and controls
provided on the transceiver; no modification should
be required for successful operation.
Although worldwide standards and conventions are not
firmly established for such aspects of HSCW opera-
tion as the setting of the frequency dial, the flexibility
of the FT-847 is such that you can easily set up the
transceiver to comply with the standards used in your
country.
The proper connection and operating procedures for
HSCW are outlined below.
C
ONNECTIONS TO
HSCW K
EYING AND
D
ECODING
D
EVICES
We recommend that you operate HSCW in an AFSK
environment, so as to simplify the potential for confu-
sion about the operating frequency. Accordingly, con-
nect your keying and decoding devices in a manner
similar to that recommended for HF Packet and other
AFSK Data operation:
Remember that the AFSK output level from the DATA
IN/OUT
jack is fixed, so you may monitor the receiv-
ing frequency, adjusting the
AF
(G
AIN
) control for a
comfortable listening level, without affecting the de-
coding of the incoming CW during a meteor burst.
The output level from the ring connection of the
DATA
IN/OUT
jack is 30 mV at an impedance of 600
Ω
,
while the optimum AFSK input level to the tip con-
nector is 40 mV at 10 k
Ω
. When connected to the DATA
IN/OUT
jack, either the internal speaker, an external
speaker, or headphones may be used to listen to the
receive frequency, without affecting the data flow to
the CW decoder.
Disconnect your microphone when using the rear
panel’s
PTT jack for T/R control.
Some keying/decoding devices may require a higher
or variable receive audio level. In this case, connect
the AFSK input line to the decoder to the
EXT SPKR
jack on the rear of the FT-847; in this case, audio from
the internal speaker will be cut off.
Appendix