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User's Manual

ManualsBrandsVertex Standard ManualsMarine RadioVertex Standard Marine Radio FT-950
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FT-950
Operating Manual
Vertex Standard Co., Ltd.
108
recommend that reduce the transmitter power to 1/3 ~ 1/2 of its normal maximum via
the Menu item “111 TGEN TX PWR”.
Advice:
If you need to adjust the output level from the “DATA OUT” pin (pin 5) of the
RTTY/PKT jack on the rear panel of the transceiver, please use Menu item “061
RTTY OUT LVL”. For the input level from the TU, there is no adjustment of the
FSK input level (Pin 4) of the RTTY/PKT jack; please make any needed level
adjustments at the TU side.
The Mark/Space Shift utilized in most Amateur RTTY operation is 170 Hz. Other
shifts may be configured, however, using Menu item “062 RTTY SHIFT”. The
FT-950 is set up for “high tone” operation (centered on 2125 Hz) by default, but you
may configure it for low tone (1275 Hz) operation using Menu item “063 RTTY
TONE”.
You may find that you are unable to decode some RTTY stations, even if they are of
sufficient signal strength. If this is observed, there may be a Mark/Space polarity
problem between your station and the other station. If so, try setting Menu item
“059 RTTY R PLRTY” to “rEU” (“Reverse”) to see if that permits copy. A separate
Menu Item permits reversal of your transmitter’s Mark/Space polarity: “060 RTTY
T PLRTY”.
Quick Point: In the FT-950, “RTTY” is a mode defined as being an “FSK” mode,
whereby the closing and opening of a keying line (to ground) causes the Mark/Space
tones to alternate. The RTTY mode is not an AFSK based mode in this transceiver, and
the AFSK output tones from a TNC will not cause Mark/Space shifting to occur. Use
the “Packet” mode for AFSK-based Baudot and other data modes.
Miscellaneous AFSK-Based Data Modes
The FT-950 may also be used for a host of other SSB-based Data modes. Please set up
your system using the illustration as a guideline.
Quick Point: When you have configured Menu item “114 TGEN VOX SEL” to “dAtA,”
the transceiver will operate in a “VOX” mode, and it is not necessary to connect a PTT
line. This makes for very convenient interfacing to computer Sound Cards, etc.