[time-nuts] Handar INC WWV receiver

WB6BNQ wb6bnq at cox.net
Sat Feb 16 22:58:59 UTC 2008


Hi Stanley,

Can't help you with the WWV receiver you have, but it sounds like you have a fairly good handle on it.  Here is the WEB site for the WWV transmitters.

http://tf.nist.gov/stations/wwv.html

>From the menu, select signal format and that page will show the "tick" format and another link to describe the rest of the modulation format.  The modulation format will give you the blueprint that your receiver follows to derive its functions.  Other menu selections are interesting
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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