SURECOM SF-401 PLUS Portable Frequency Counter w/ CTCCSS/CDCS

Introduction:　

• The frequency meter capable of measuring the parameters of the frequency of the continuous carrier signal walkie-talkies , with signal strength indicator.
  it is the tool of choice for maintenance personnel ,test frequency and signal strength of wireless enthusiasts.
• This portable frequency counter is designed for counting continuous wave signal comes from Two-way Radio. 
• There are easy ranges for you to choose. The ranges cover most of the frequency of the two way radios you want to measure. 
• Its four-button control is easy to use and its small size allows you to carry it anywhere you like.
•  Work by  TCXO(Temperature Compensate X'tal (crystal) Oscillator) ,In the range of -45 ℃ ~ 65 ℃ can reach ± 2 ~ ± 4ppm accuracy
• This include very interesting frequency areas such as 2m HAM radio, all VHF and UHF
• DMR Radio signal e frequency counter.
• Easy Battery level 
   

Feature & Specification:

• Frequency range: 100Mhz-3000Mhz
  ! Note: (27MHz to 100MHz It can not be guaranteed and the corresponding normal emission appliance)
• CTCSS/DCS Decoder
• LCD Dim level setting
• Frequency digital 0.000  or 0.0000  ( +-0.001)
• Work by TCXO( Temperature Compensate X'tal (crystal) Oscillator) 2～2.5ppm
• Frequency Response time:  0.2-0.5sec.( CTCSS/CDCSS >0.5-1sec) 
• TFT Color Display 240 x 320 
• Build-in  Li-ion battery
• Net Weight: 113g 
• 4 buttons control
• Auto power off  1-9minutes   
• Charging battery LED indicator  

Package Contents:

• 1x SF401plus Frequency Counter
• 1 x UHF Antenna

Power On/Off                                    
Power On –Press and Hold down the [black key] by 2 second 
Power Off –Press and Hold down the [black key] by 4 second of number count down to 0
Charging the battery 
Plug the Power cord into adaptor , Micro USB connected SF-401, The Led indicating:
 *The RED Led is light - Charging        
 * The Green Led is light - Full 
How to check Frequency measuring.    See PIC.3

The transmitter near the frequency counter antenna , see the signal reception conditions is zone green, you can test. Please see Pic.3
cautions: 
e.g. display 1800.000Mhz  , The transmitter distance is too close to the frequency counter will affect the test results, , the signal bar is red .(see Pic.1)
e.g. display 0.000, , The transmitter distance is too far to the frequency counter and signal is weak ,will affect the test results,  the signal bar is low .(see Pic.1)
! Note: (27MHz to 100MHz It can not be guaranteed and the corresponding normal emission appliance) .

How to check Frequency of Digital DMR Radio 

Press[ F3 Digital] from Measuring screen 
Note. Digital model have 3 Decimal only

MENU funtion setting and save.    See PIC.4
Press [F1] > into menu Page
Press [F3 down] or [F4 Up] into System and Press [F2 Rtn] into system Page PIC.4
Press[F3 down] or [F4 Up] select funtion ,Press [F2 Edit] > [F3 - ][F4 +] change mode
Press[Menu]  >  [F1 ]to Exit  or  [F4 ] to Save and Exit

CTCSS/DCS Decoder for ANALOG mode

CTCSS

　CDCSS

*21/10/2021