Yaesu Musen 20575X50 HF/VHF/UHF All Mode Transceiver User Manual FT 991A Operating Manual
Yaesu Musen Co., Ltd. HF/VHF/UHF All Mode Transceiver FT 991A Operating Manual
Contents
- 1. Users Manual Part 1 Rev 1
- 2. Users Manual Part 2
- 3. TempConfidential_05_User_Manual_scope_function_only
TempConfidential_05_User_Manual_scope_function_only

HF/VHF/UHF All Mode TrAnsceiVer
FT-991A
operATing MAnUAl
YAESU MUSEN CO., LTD.
Tennozu Parkside Building
2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 Japan
YAESU USA
6125 Phyllis Drive, Cypress, CA 90630, U.S.A.
YAESU UK
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
FCC ID: K6620575X50 / IC: 511B-20575X50
YAESU MUSEN CO., LTD.

Page 40
FT-991A OperATing MAnuAl
convenience features
Scope
The SCOPE function provides a spectrum display of the band conditions. Both strong and weak signals can be clearly 
displayed on the TFT screen. In the MANUAL mode, the scope frequency spectrum is scanned one time and displayed. 
In the “Continuous Sweeping mode”, the scope spectrum is repeatedly swept and displayed. The scope sweep and span 
may be optimized according to your preferences and purposes.
Touch [SWEEP] on the LCD to display the band condi-
tions (spectrum).
  The transceiver is equipped with two types of sweep-
ing  mode:  “MANUAL  mode”  and  “Continuous 
sweeping mode”. Refer to the advice below to select 
the optimal mode according to your preferences and 
purposes.
Advice:
  “Spectrum  display  mode”  or  “Waterfall  display 
mode”  may  be  selected  in  Menu  item “117 SCP 
DISPLAY MODE”.
  Width of scope display may be set in Menu item “118 
SCP SPAN FREQ”.
  Color  of  the  SPECTRUM  display  may  be  set  in 
Menu item “119 SPECTRUM COLOR”.
  Color of the WATER FALL display may be set in 
Menu item “120 WATER FALL COLOR”.
Reception frequency Transmission frequency
Width of scope
Lights up when transmission frequency 
is outside of the display range
Reception frequency: Green
Transmission frequency: Red
Example of waterfall display
FCC ID: K6620575X50 / IC: 511B-20575X50
YAESU MUSEN CO., LTD.

Copyright 2016
YAESU MUSEN CO., LTD.
All rights reserved
No portion of this manual may be
reproduced without the permission of
YAESU MUSEN CO., LTD.
Printed in Japan
FCC ID: K6620575X50 / IC: 511B-20575X50
YAESU MUSEN CO., LTD.