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فركانسمتر تا يك گيگاهرتز

gadraj

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معاونت انجمن
2007-05-09
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2012-01-30
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اين هم مدار كاملي براي يك دستگاه فركانس متر تا محدوده يك گيگا هرتز :
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This simple counter is useful for frequency measurements of various wireless equipments, especially transmitters, receivers and signal generators in VHF/UHF band.
Features
  • Display range: 0,0 to 999,9 MHz, resolution 0,1 MHz
  • Correct rounding, reduced blinking of last digit
  • Over-range indication
  • Fast measurement - short measuring period
  • High input sensitivity in VHF/UHF band
  • Switchable intermediate frequency offset for use with receiver
Technical specifications
Supply voltage: 8-20 V
Supply current: typ. 80 mA, max. 120 mA
Input sensitivity: max. 10 mV in 70-1000 MHz range
Measuring period: 0,082 sec.
Display refresh rate: 49 Hz
Schematic diagram
Parts list
R1 - 39 k
R2 - 1 k
R3-R6 - 2,2 k
R7-R14 - 220
C1, C5, C6 - 100 n mini
C2, C3, C4 - 1 n
C7 - 100 u
C8, C9 - 22 p
IC1 - 7805
IC2 - SAB6456 (U813BS - different pin layout, not tested, also maybe R1 value must be changed)
IC3 - PIC16F84 programmed + socket
T1 - BC546B
T2-T5 - BC556B
D1, D2 - BAT41 (BAR19)
D3 - HD-M514RD (red) or HD-M512RD (green), 4-digits multiplex driven LED display from HP, or four standard 1-digit LED displays
X1 - 4 MHz crystal
BNC input connector
The SAB6456 is a prescaler for UHF/VHF tuners. The circuit has an input frequency range of 70 MHz to 1 GHz, has high input sensitivity and good harmonic suppression. With lower sensitivity it's usable down to 3 MHz.
The circuit comprises an input amplifier, a divider stage and an output stage. The divider stage may oscillate during no-signal conditions but this oscillation is suppressed when input signals are received. The voltage-edges of the output signals are slowed internally to reduce harmonics in the television intermediate frequency band.

Printed circuit board
Important!
There are two pin connection versions of the SAB6456. In the schematic diagram there is drawn a standard pin connection as provided by Philips datasheet. The PCB is proposed for both versions.​
PCB - standard pin connection of SAB6456
PCB - different pin connection of SAB6456
The display is placed vertically on the PCB.
لينك كمكي فايلهاي ضميمه در سايتمون:

با تشكر .
موفق باشيد .

با تشک از شما
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