[time-nuts] WWVB remod instant cheap clock receiver

Paul Davis ziggy9+time-nuts at pumpkinbrook.com
Sun Jul 13 17:54:10 EDT 2014

The real point was just to mention another source - j/k about the price ;)  Lots of Wally World around so maybe easier to find than Costco. I embedded a picture which I hope will appear. The loopstick is about 7mm diameter and 6cm long. It is attached to a small circuit board which is marked RC8000 V1. Don't know if there is a CM8000 chip under the black blob, but could well be. Top to bottom as mounted in the clock the connections are labeled on the clock board as:

1 - PON (Power ON - active low)
2 - TCO (Time Code Out - idles low in standby)
3 - gnd
4 - vdd (3V from battery) - probably 3.3v OK.

Verified those with 'scope. Slightly different pinout but similar signals.


On Jul 13, 2014, at 10:41 AM, paul swed <paulswedb at gmail.com> wrote:

I figured there were other modules. Glad to see wallymart has them also.
Over payed? The costyco comes in a multi color display with temp and
But then again its the module after all.
How big is the loopstick and did you confirm the wiring?

On Sun, Jul 13, 2014 at 1:32 AM, Paul Davis <
ziggy9+time-nuts at pumpkinbrook.com> wrote:

> Paul -
> You over paid ;)
> Neither one is going to break the bank, but I found the Westclox Model
> 72006 'Atomic LCD Alarm Clock' $10.97 at Walmart. Similar module inside.
> Paul
> On Jul 11, 2014, at 12:55 PM, paul swed <paulswedb at gmail.com> wrote:
> Intended to add the model number.
> Cosco only has one type a c89201
> On Fri, Jul 11, 2014 at 12:41 PM, Pete Lancashire <pete at petelancashire.com
> wrote:
>> Do you have a model number or can you send me a picture ?
>> Have to do a Costco run this weekend
>> -pete
>> On Fri, Jul 11, 2014 at 9:16 AM, paul swed <paulswedb at gmail.com> wrote:
>>> OK its been a bit hard finding the little wwvb receiver kits the last
> few
>>> years.
>>> While in costco for sub $18 Lacrosse sells a multi color LCD clock.
>>> Welllll you just know what happened next.
>>> The clock as a wwvb receiver works great however if you read the reviews
>>> there is a issue with the battery backup.
>>> It doesn't work. Mine does so who knows and I don't really care.
>>> There is a clock module in the unit and it works nicely. See attached
> pix
>>> V = 3V in
>>> P2 = control ground=on
>>> T = data high=low carrier compatible with the remod as is no inverter
>>> needed.
>>> G = ground
>>> To get inside to recover the module.
>>> Remove the glass screen its stuck on. Gently pry off.
>>> There are 4 screws one in each corner.
>>> You could simply tap the module out and use it or feed the data back
> into
>>> the clock. Lots of options.
>>> But my only goal is a source of clock modules for time-nuts that does
> not
>>> require a microscope to solder.
>>> By keeping the loopstick you can wrap 10 turns of wire around the end
> and
>>> feed a larger active antenna to it as a tuned stage.
>>> Regards
>>> Paul
>>> WB8TSL

More information about the time-nuts mailing list