[R-390] WWV Frequency Standard

[Flowertime01 at wmconnect.com]

Fellows,

There is a difference between absolute time and frequency.

Count time ticks from WWV and time ticks from your local standard.

After six months or so review the difference on your two counters.
Then adjust your local time standard up or down a bit.

You frequency standard is within one 1 second time tick over six months.
I suggest that is close enough for government work.

In 1975 in Okinawa we would trigger two counters and let it run 24 hours.
We expected zero difference. We perforned this test as a monthly maintenance 
procedure. This was just for a frequency standard.

For time we used a dual trace scope and an off set time delay number provided 
by the military to us. There was a document with lots of locations and 
expected time delay.

Again we measured the delay with a dual trace scope and averaged the delay 
over lots of time (weeks). The "clock" had an offset in it. The frequency 
standard tick edge was any where it wanted to be. The clock would let us have any 
number of steps up to 1,000,000 between the frequency edge and the time edge. 
Then you could set the time display to tick any second from the time edge.

In the Army with lots of techs working 24 X 7 you could put 6 or 8 guys on 
the job of guarding the "maintenance procedure" for 3 or 4 days each month. You 
did not watch it all shift but you set up the procedure and passed it from 
shift to shift.

In the Army you just did not clown around with some activity going on. 
Hundreds of guys and girls worked in the radio rooms and just left things alone for 
ever and ever.


You can have a standard in your shop that is closer than a RCH. 

And then I ask you what for? 

The American Military has run planet wide RF communications and reportedly 
off planet communications with R390's, TS505s, TS352s, TEK 505s, and AN/URM25's 
since the 1950s. 

What are you doing in your hobby that needs better resolution than what you 
can get with that equipment?

You cannot prepare kebelsa sausage with better resolution.

Roger AI4NI





    

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/r-390/attachments/20081206/2dd13268/attachment.htm