OPERATION
I.
CW Monitor
Connect the YR-901, the station receiver, and the
TV monitor as shown in Figures 5 and
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When
using the video modulator to drive a home televi
sion, see page 18 for details on switching between
channels 3 and 4 for output from the video
modulator. The output impedance from the YR-
901 RF OUT jack is 75 ohms, so a balun must be
installed to provide a 7 5 ohm to 300 ohm un
balanced to balanced feed for those televisions
using 300 ohm feed only. The video modulator is
an available option. See your Yaesu dealer.
We recommend that the television antenna be
disconnected to avoid transmitting the YR-901
output signal from that antenna.
The preferred method of viewing the YR-901
output is on a video monitor, commonly available
from computer hobby supply outlets. The correct
connection method is shown in Figure
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When using headphones to monitor the CW output,
please do not use the FT-901 DM PHONES jack,
as this will cut off the output from the SP jack.
Instead, use the PHONES jack provided on the
YR-901 front panel.
FT-9[]0<0M W
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Operation
( 1) Preset the receiver for your favorite beat note
on the FT-901 DM marker signal.
(2) Preset the YR-901 controls and switches as
follows:
MODE .......... CW.B (For Morse Code)
NAR/WIDE ...... WIDE
TTY (45/50) ..... OFF
NEG/POS ....... POS
ACR ............ OFF
POWER ......... ON
(3) Advance the INPUT LEVEL control as neces
sary to obtain a 1 /3 scale indication on the
level indicator LEDs. Now adjust the F. ADJ
control on the rear apron of the YR-90 1 for
maximum deflection of the indicator LEDs.
This will preset the input bandpass filter for
maximu
response on your preferred beat
note. Now turn off the marker.
( 4) Tune in the desired CW signal, and adjust the
INPUT LEVEL control so that the indicator
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11
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FT-901DM
+
YR-901
+TV
Fig.5
CW Monitor
-9-
