As part of the wwvb remod testing I was given a spectracom netclock2 by David on the list. As mentioned yesterday the remod works well with it.
However the netclock2 was a later spectracom at the point they no longer gave out the schematics in the manuals. The good news is the entire rcvr is a typical 81XX class frontend. Crystal 60 KHz etc. Clearly this was a later design and some slight difference are there. But if you have nothing the old schematics will help. I will say the board was re-laid out and its a cleaner layout thats easier to follow. The vco chain is different in that it uses a 5 Mhz xtal not 10 and a 7492 and 74390 counter chain. Have not figured out the math yet but they tend to want to get the vco to 20 Khz and multiply by 3 to 60 Khz for comparison. Captured the 27c256 eprom for safe keeping. Also have 35 pix of the various boards just incase a part smokes (Not that it ever really happens)and you can't tell the resistor color codes. Happy to upload to a site if desired. Not sure how many netclock 2s are out there. Regards Paul WB8TSL _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
