[time-nuts] Ultralink

John Ackermann N8UR jra at febo.com
Fri Mar 30 17:11:04 EDT 2018


Hi Brooke --

Yes, all the chips on the board are low power devices.  I'm measuring 
the receiver as drawing 0.9 MA at about 2.3 volts.

Update -- I moved the receiver and farted around with the wiring, and 
now the S-Meter is off the peg, responds to orientation changes, and I 
actually got a couple of indications of bits being decoded.  So, I think 
the hardware is working fine.

However, there must be a lot of local interference as decoding is very 
erratic and I'm nowhere near getting a full sequence.  I don't have any 
experience at this location with WWVB reception, so I'm not sure what to 
expect.  At my previous Ohio house a mile south of here the signals were 
very good and there were no noticeable problems with the Spectracom 
receivers (may they rest in peace).  Next step is to experiment with 
receiver placement.

John
----
On 03/30/2018 03:15 PM, Brooke Clarke wrote:
> Hi John:
> 
> The U4226B chip operates at very high impedance levels in order to 
> minimize battery drain in its main application, battery powered clocks.
> So some sort of buffer is needed on all the output pins.
> 
> The 333 model, with the analog meter, was made for the folks working for 
> WWVB as a way for them to know the transmitter was on the air.
> http://www.prc68.com/I/timefreq.shtml#WWVBrcvr
> http://www.prc68.com/I/Loop.shtml (WWVB)
> 


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