Furuno FAX-30 - Manual (Page 35)

2. FAX OPERATION: NAVNET
2-13
2.5 Processing Facsimile Images
2.5.1 Phase mismatch
When the FAX-30 starts receiving a broadcast already in progress, or noise
prevents detection of the phasing signal, the image may be divided into two
parts by a thick black (or white) stripe called a dead sector. This phenomenon is
due to phase mismatching. When this occurs, correct phase mismatching, after
the facsimile has been received.
0 10 20 30 4 0
Dead sector (can be white)
Dead sector
center at "15"
Example of phase mismatching
1. With a facsimile image displayed (see paragraph 2.4), press the EDIT
IMAGE soft key.
10 20 30 0 4 0
102N JMH 7305.0kHz IOC576 120rpm JUN/05 01:26
PHASE
SYNC
EDIT
COLOR
RETURN
NOISE
REJECT
EDIT
IMAGE
Facsimile image with dead sector
2. Press the PHASE soft key.
PHASE
▲
00
▼
Phase entry window
3. Read the scale to find the center of the dead sector and enter it in the phase
entry window. For example, in the illustration above the dead sector is
centered at "15" on the scale, so you would enter “15”. The setting range is
00 to 40.
4. Press the ENTER soft key.
5. Press the RETURN soft key several times to return to the standby display.