Yaesu FT-736R Operating Manual page 39

to the
jack:
which
outer contact of the DATA IN/OUT
impedance should be 600 ohms,
corresponds with most tncs. Output
signal level from
the tnc should be
adjusted to about 30mVrms, or so that the
BUSY indicator on the front of the FT-
736R lights dimly when transmitting.
If your tnc has de-emphasis applied to the
AFSK output, the levels of the two tones
will be different, and must be re-balanced
by pre-emphasis in the FT-736R. In this
case connect the AFSK signal from the tnc
for transmission to the microphone jack
(also 600-ohm impedance), and adjust the
MIC gain
control so that the BUSY
indicator glows dimly when transmitting.
For receiving, there are also two available
output points for AFSK, again depending
on whether your tnc pre-emphasizes recei-
ver audio. If the tnc can accept balanced
tone levels, connect the center tip of the
DATA IN/OUT jack to the receiving input
on the tnc: output level is 200mV at 10
kilohms, so make sure your tnc can handle
this level (or add a 10k resistor to ground
and another in series to set the level).
If your tnc requires unbalanced tones (and
includes its own pre-emphasis,
many TAPR TNC-2 clones), use
level signal at the EXT SP or
jack.
such as
the high
PHONES
Note, however, that using the EXT SP or
PHONES jack has two serious disadvan-
tages: ( 1) plugging into these jacks
disables the loudspeaker, making it
impossible to monitor the receiver (this is
not recommended); and (2), the AF gain
and TONE control setting will affect the
packet input to the tnc.
Set the FT-736R to the FM mode for VHF
and UHF packet (1200 bits/sec Bell 202
standard), and set the BURST and NOTCH
switches OFF (out). Also, if you have the
FTS-8 Tone Squelch Unit installed, make
sure that tone squelch is off. Receiver
tuning is as described for FM (§4.16).
Press the FM CH switch for channelized
tuning with the CHANNEL knob. You
also use the CAT System to select
operating channel
automatically
software. Use the memories to store
common packet channels in your area,
easy recall.
4.18.2
QPSK Packet Operation
can
the
via
the
for
This mode is used for narrowband 1200
bits/sec operation, such as on the down-
link of the Fuji (FO-12) satellite. You
need a QPSK modem in your tnc, but con-
nections are otherwise the same as for
Bell 202 packet. Use either SSB mode for
receiving, but make sure that the SSB CH
switch is OFF, and that 10 Hz tuning
steps are selected (by the STEP key). You
can use the CAT System or the scanning
lines of the MIC jack for automatic tuning
if your QPSK modem includes this func-
tion. For
transmitting to the F0-12
satellite, use standard Bell 202 in the FM
mode, as described above.
4.19 Fast Scan Television (ATV)
The optional TV-736 ATV Unit allows fast
scan NTSC-standard television operation on
the 1.2 GHz band (when the optional 1.2
GHz Band Module is installed).
Connect the TV-736 through the holes in
the right side of the transceiver to the 1.2
GHz Band Module. Connect your periph-
erals to the TV-736 as shown on the next
page. If your camera includes a microphone
you do not need to connect another.
Otherwise, connect your microphone to the
MIC jack on the TV-736.
The mode selector buttons and SHIFT/-
NOTCH controls on the front panel are
bypassed during ATV operation, since the