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AFC-2500 Frequency Counter

Frequency Counter: Frequency range: 10Hz2.5GHz, Input signal amplitude: 50mV250Vpp; optional functions: three inputs (A - up to 2.5GHz, B up to 500MHz, C up to 10MHz), Data Hold, LCD display 8 digits, Relative Measurement, Data record (Max., Min., reading), Period, Auto power off, Noncontact measurement capability through antenna. Power Supply: 4x1.5V AA. Dimension: 173x80x35mm / 6.8x3.1x1.4in. Weight: 340g/0.75lb (including battery).

User's Manual (1.11 Mb)

AKTAKOM AFC-2500 compact frequency meter that can easily fit in your palm is designed to measure frequency and signal period. The use of a specialized microprocessor allows introducing a number of "smart" functions. Using the external telescopic antenna you can measure the carrier frequency of various radio transmitting devices.


  • High sensitivity for the VHF & UHF frequency measurement, excellent for CB hobbyist.
  • Handheld & pocket size instrument
  • Wide measuring range up to 2.6GHz
  • Good resolution, 0.1Hz min. display unit for 10MHz range.
  • Used the exclusive Microprocessor IC offered the intelligent function: Frequency, Period, Multi resolution, Data hold, Relative measurement, Data record (Max., Min., Average reading).
  • Auto power off & manual power off.
  • LCD display for low power consumption & clear read-out even in bright ambient light condition.
  • The instrument used the low PPM crystal time base to offer high accuracy measurement.
  • The optional telescoping antenna accessory can be used to pick up transmit frequencies from handheld, fixed or mobile radios such as: POLICES, FIRE FIGHTER'S, HAM, TAXI, AIRCRAFT MARINE, etc. at ranges of approaching 5 to 30 cm (depending on transmitter power, antenna obstructions, etc.).


Display 13mm (0.5") LCD (Liquid Crystal Display), 8 digits.
Measurement Frequency, Data hold, Relative, Memory (max., min., average), Period.
Range 2500MHz 50MHz to 2500MHz (typical max. 2600MHz)
100MHz 5MHz to 120MHz.
10MHz 10Hz to 10MHz
Period 10Hz to 10MHz
Resolution, Sample Time Ref. the following "Table for Resolution & Sample Time".
Sensitivity (rms) 2500MHz range 50MHz75MHz 100mV
76MHz2500MHz 50mV
100MHz range 5MHz100MHz 50mV
> 100MHz to 120MHz 100mV
10MHz 50mV
Period 50mV
Frequency Accuracy (4PPM+1d) - 235C, after calibration.
Time Base circuit 4.194MHz quartz crystal
Time Base Temp. Coeffic 0.1PPM/per (typical, 235C).
Over-input 2500MHz & 100MHz range Max. 5V peak to peak.
10MHz & Period range Max. 250V peak to peak
Input Connector BNC, female.
Case Durable & strong ABS-plastic housing.
Operating Temperature 0 to 50C (32 to 122F).
Operating Humidity Less than 80% RH
Power Supply 4 x 1.5V AA (UM-3) battery.
Power Consumption 2500MHz & 500MHz range Approx. DC 105mA
10MHz & Period range Approx. DC 45mA
AC Adapter Power Input Optional, 9V DC , 300 to 500mA rating, central positive for socket.
Power Off Automatic power off & manual power off
Dimension 173x80x35mm (6.8x3.1x1.4in).
Weight 340g/0.75lb (including battery).

Resolution & Sample Time

Range Gate Time Select Resolution Sampling Time
2500MHz FAST 1000Hz 0.5s
SLOW 100Hz 2.75s
SLOW (select 1) 200Hz s
SLOW (select 2) 500Hz 0.75s
500MHz FAST 100Hz 0.75s
SLOW 10Hz 6s
SLOW (select 1) 20Hz 5s
SLOW (select 2) 50Hz 1.5s
10MHz FAST 10Hz 0.5s
SLOW 1Hz 1.25s
SLOW (select 1) 0.2Hz 6s
SLOW (select 2) 0.1Hz 11s

Standard Accessories

  • Instruction Manual

Optional Accessories

  • Telescoping RF pick-up antenna with BNC connector
  • Direct probe with BNC connector & alligator clip pairs. (Be used only for the measuring frequency 500MHz)
  • Soft carrying case

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