Features

• 10 digit Liquid Crystal Display
• Low power consumption (Average 6 hour battery life)
• Supplied with NiCd pack, AC wall charger and telescopic antenna
• Hold switch to lock display
• Low battery indicator
• Ultra sensitive synchronous detector 16 section bargraph to show RF signal strength
• High speed 300 MHz direct counter with 0.1 Hz resolution
• 4 selectable gate speeds

Controls

1. Power Switch - This slide switch turns the counter on and initiates a 2 second test of all the LCD segments.
2. Range Switch - This should be switched to the 300 MHz position for frequencies between 1 MHz and 300 MHz and switched to the 3 GHz position for frequencies between 10 MHz and 3 GHz.
3. Hold Button - This holds the current display and stops the counter from counting.
4. Gate Button - This selects the gate or measurement time. A longer gate time allows counting for longer period and results in higher accuracy.
5. Calibration - The calibration adjustment opening is located on the front panel of the counter. This allows access to the trimmer capacitor that provides about a 10 PPM adjustment range of the time base oscillator. This is not usually necessary but to do so read a signal of a known frequency before adjusting the trimmer for correct frequency display. If you calibrate at 4.1943 MHz or above then the counter will be more accurate.

Warranty

Circuit Specialists, Inc. guarantees the counter and accessories for one year against manufacturing defects. This warranty does not cover items that have been modified, subject to unauthorized repairs, misuse or abuse. This warranty does not cover damage caused by excessive power levels applied to the signal input. Never make any kind of connection between the counter and a transmitter.

Hints And Tips

1. NiCd Operation
   This frequency counter can operate for up to six hours from its fully charged NiCd batteries. They are charged when the unit is plugged into the supplied AC/DC adapter. Full recharge will occur over12 to16 hours. Before recharging the batteries you should be deep cycled occasionally by allowing them to completely discharge to maintain maximum battery capacity. The NiCd batteries should last for several years. However, it is a good idea to check them every twelve months for signs of corrosion or leakage. Always replace the whole set if any one cell fails.
    
2. Signal Input
   When using the counter with an antenna for signal pick up, random frequencies may appear on the display. This is quite normal and is caused by the high gain of the receiver circuits which amplify noise in the absence of a strong readable signal. Never get the unit too close to a transmitter as internal damage will result.
    
3. Antenna Selection
   The supplied telescopic antenna is best for general purpose use. This is because its length can be adjusted to suit the frequency required. Usually you will want a shorter antenna for UHF and a fully extended one for VHF / HF.
    
4. Reception Distance From Transmitter
   The distance from which you will be able to receive frequencies will depend upon the type and location of the transmitting antenna, transmitter output power and the frequency in use.
   Some typical distances are:
    

Input Sensitivity ( Typical )

RF Signal Strength Bargraph

Frequency Display Resolution