Q23. Is It Possible To Connect A Selcall (Selective Calling) System; Q24. I Would Like To Know The Alc Adjustment Method; Q25. I Would Like To Know How To Make Frequency Adjustment; Q26. What Is Allowable Deviation Of Nbdp And Dsc Frequencies - Furuno FS-1575 Service Manual

Q23. Is it possible to connect a SELCALL (Selective Calling) System?

A23. Yes, it is. You can connect a SELCALL system between #12 (H) and #13 (C) of
LINE IN (0 dBm/600 ohms) and between #14 and #9 (GND) of REM TX KEY of
[REMOTE] port.
For this purpose, you need to select [MENU] -> 9.SERVICE -> 3.RT SETUP ->
1.SETUP -> SELCALL -> "ENABLE." The SELCALL function is assigned to
the [7] key. Pressing the [7] key will set to 2331.5 kHz/AM.
LINE input level adjustment is made by selecting [MENU] -> 9.SERVICE ->
3.RT SETUP -> 1.SETUP -> "LINE IN" in the range of 0dBm + 10dBm.

Q24. I would like to know the ALC adjustment method.

A24. You can make ALC adjustment for TX output power on all bands by setting
"power data" to "default data" and using the 2-tone adjustment circuit.

Q25. I would like to know how to make frequency adjustment.

A25. You can make frequency adjustment by selecting [MENU] -> 9.SERVICE -> 3.
RT SETUP -> 1.SETUP -> "REF OSC."
Frequency deviation is ±10 Hz for all modes.

Q26. What is allowable deviation of NBDP and DSC frequencies?

Up to how much deviation can messages be decoded?

A26. Frequency deviation is to be within ±10 Hz. Deviation of up to ±50 Hz allows the
decoding of messages.

Q27. How to verify the model of a system?

A27. No model setting parameter is provided. The model of a system in use is verified
the PA-IF board type A, B and COMB board is mounted, when turning ON the
power supply.
To ensure the verification result, you should select [MENU] -> 9.SERVICE ->
1.EQUIP TYPE.

Q28. Using the RX antenna resulted in reduced receiver sensitivity.

What is the cause of this problem?

A28. Did you make system setting to use the RX antenna? You should ensure that the
setting has been made as follows:
1) [MENU] -> 9.SERVICE -> 3.RT SETUP -> 1.SETUP -> RX ANT ->
"CONNECT"
2) [MENU] -> 5.SYSTEM -> 7.RT SETUP -> 2.ANTSELECT -> "RX ANT"

Q29. What do the figures shown in red on the SELF CHECK window mean?

A29. These figures deviate from the threshold for self-checks. There is a problem with
the relevant circuit.
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
Of course, error increases.
9-4
Chapter 9 Q&A
See page 4-67
See page 5-50
See page 5-26
See page 5-26
See page 6-29
See page 4-71
See page 6-15