No subject

to, such as their history page.

Good luck,

Bill....WB6BNQ


Stanley Reynolds wrote:

> 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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