Frequency counter up to 1 GHz. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Frequency counter up to 1 GHz. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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This simple frequency counter is useful for measuring the frequency of various equipment, especially RF/MW transmitters, receivers and signal generators.

Specifications

Measurement range: 0,0 to 999,9 MHz, step 0,1 MHz
Correct rounding, reduced flashing of the last digit
over-range indication
Fast measurement - short measurement period
High sensitivity in the RF / microwave range
Can subtract 10,7 MHz for use with a receiver

Technical data

Supply voltage: 8-20V
Current consumption: typ. 80 mA, max. 120mA
Input voltage: max. 10 mV in dia. 70-1000 MHz
Measurement period: 0,082 sec.
Display Refresh: 49 Hz

scheme

(click to enlarge)

Details

R1-39k
R2-1k
R3-R6 - 2,2k
R7-R14-220

C1, C5, C6 - 100 nF
C2, C3, C4 - 1 nF
C7 - 100uF
C8, C9 - 22pF

IC1 - 7805(KREN5A)
IC2-SAB6456
IC3 - PIC16F84 programmed + socket
T1-BC546B
T2-T5-BC556B
D1, D2 - BAT41 (BAR19)
D3 - HD-M514RD (red) or HD-M512RD (green), 4-digit switchable LED display
X1 - 4 MHz Quartz
HF - connector

For use with a receiver, connect jumper "10.7".

Frequency counter up to 1 GHz

Program for IC3 download

Programming settings: generator: XT, WDT: off.

Settings for SAB6456

SAB6456 prescaler for HF/UHF tuners. INPUT: 70 MHz - 1 GHz, with high sensitivity. Below 3 MHz senses. - worse.

The microcircuit contains an input amplifier, a comparator. The comparator may oscillate during the absence of a signal, but this oscillation is suppressed when input signals are received.

Printed circuit board

Important! There are two versions of SAB6456 pin connections. The diagrams show a standard connection as provided in the Philips datasheet.

Download file counter.zip with PCB layout from Werewolf'and.

PCB - SAB6456 Standard Pinout (Parts Diagram)

PCB - Standard Pinout SAB6456 (Printed Circuit Board)

The display is mounted vertically on the board.

Publication: cxem.net

See other articles Section Measuring technology.

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