7
6 – DECODING WHEN RECEIVING TELEGRAPH
1) Set the desired reception sound volume with the AF control of the receiver.
2) If your receiver set is equipped with a CW filter, make the CW filter effective.
3) If your receiver is equipped with IF shift control, pass band tuner or notch filter, set the peak
reception volume at the frequency of 800 Hz.
4) Set the TONE control knob of the CWR-880 at the center position and tune the receiver to re-
ceive 800 Hz si nal. CW LED will flicker in synchronization with the reception sound and de-
coded characters will be shown on the display monitor. If the CW LED does not flicker in syn-
chronization with the reception sound, decodin is not done normally; tune the receiver a ain
or make fine adjustment with the TONE knob.
7 – DECODING WHEN RECEIVING RTTY
* Teletype for amateur radio station
1) When the CW/RTTY selector of the CWR-880 is set to RTTY, a messa e "BAUDOT SPEED 45b
NOR" appears on the display, which shows that the reception with an amateur radio station is
enabled. Place the TONE VR knob at the position "HIGH" and set the receiver in LSB or FSK
mode. Turn the receiver tunin dial radually from the position of lower beat to that of hi her
beat. First the MARK LED flickers. Tunin the dial further to hi her position (shiftin by 170
Hz), the MARK LED and SPACE LED will flicker with correct decodin started. Flickerin of only
the SPACE LED indicates improper tunin . In such a case tune the receiver a ain or adjust the
TONE VR finely to make the MARK LED also flicker.
2) When the received characters are chan ed to numerical fi ures or symbols due to noise or oth-
er interference durin reception of ordinary alphabetical characters, set the USOS switch in ON
position and normal alphabet will be obtained when space si nal is received.
3) LTR/FIG switch is to chan eover between alphabet and numeral every time it is pressed. When
alphabet is chan ed to numeral due to noise or other interference, press this switch to obtain
the normal decodin .
4) Set the NOR/REV switch to REV to receive si nals of reverse shift. Reverse shift is obtained al-
so when receivin from KEY IN (TTL IN).
* Teletype in commercial station
While settin procedures for teletype in commercial station are almost the same as those of
amateur station, the receiver mode is to be set to USB. As the transmission speed of 50 baud
is widely used, set the SPEED to 50b. Since some stations transmit at 57 or 75 baud, try these
speeds if normal decodin is not obtained. Si nals from many unidentified stations cannot be
decoded at all. Because si nals from commercial stations have wide shift width, tunin is easier
than amateur station.
* Teletype of TOR system
TOR system teletype is equipped with automatic error correction function which corrects a mis-
received character automatically. Intermittent reception sound like "chee chee chee" is iven in
