My first post. I became interested in time as the result of time syncing my
network of PCs' time and using my firewall as a time server. I wanted to make
my own network time server using a GPS receiver. The WWV receiver is just for
extra fun also have a WWVB receiver in the works.
Ebay turned up this receiver board intended for signal light systems which I
have and hope to use.
HANDAR INC.
541-6001
WWV REV B C1990
MADE IN USA
BD#541-2001 (BAC)-F 895
Does anyone have info about this board ?
No luck with Google any tips about where to look ?
Supply voltage, connector J2 pin-out, data format etc ?
My visual inspection reveals :
J1 antenna in
J2 power and data connector 12 pins
Test points : (L.O.) (DEMOD) (TIME CODE) (RTC)
It has 3 crystals for 5,10, and 15 MHz single conversion IF 455Khz with 3
crystal filter.
Receiver IC ST TDA12208
Demod section ICs : LM366N-4 LM393N LF353 (part number hard to read on this
last one not 100% sure)
Processor Intel 80C51FA crystal 11.0592
Several support ICs 74HC type not listed
UV EPROM 27C64 socketed with sticker (541) & (2.45) 541 is same as board part
# 541-6001 guess 2.45 is firmware version
RTC ic OKI THAILAND M6242B with 32Khz crystal
Power section has 2 ICs LP2951CN think one makes 10V for receiver and one makes
5V for logic power supply maybe 12V ?
J2 pin 7&8 ground
pin 9 + supply
Several things I will try if I find no info:
1) Start at 5 volts supply and ramp up to 12V while watching the 10 and 5 volt
outputs to determine supply.
2) Read eprom and dissemble firmware code for clue to data format
3) Trace board to id input and output data pins
Stanley
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