FT-920 Operating Manual
17
3. Other Digital/Recording
Device Interfacing
AF O
UT
Jack
This is a 3.5 mm miniature phone jack which pro-
vides constant-level (100 mV @ 600 Ω) for connec-
tion to a WeatherFax decoder, tape recorder, or other
accessory. The audio output level is not affected by
the setting of the front panel AF GAIN control, so you
can turn the volume down, if you like, without affect-
ing the audio level being presented to your decoding
device.
The connection to the A
F OUT jack is at the same
level as the connection to Pin 4 of the DATA jack. How-
ever, the two output ports use independent output
buffer amplifiers, so you can freely connect and dis-
connect devices to/from these ports without concern
over the impedances and levels.
PTT Jack
This RCA jack is wired in parallel with the DATA jack’s
Pin 3, and may be used in conjunction with a com-
puter or TNC’s PTT line, if desired.
P
ATCH
Jack
For transmit audio input for SSTV (Slow-Scan Tele-
vision) operation, you may connect the SSTV
terminal’s TX AUDIO line to the PATCH jack. You will
need to disconnect the microphone, however, during
transmission, as the PATCH jack is connected in a “Y”
configuration along with the microphone input (from
pin 8 of the MIC jack).
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