[Premium-Rx] use of precision time base

[Glenn Little WB4UIV]

At 08:31 PM 12/11/07, Ed Tanton wrote:
>Large amount of text snipped


A Cesium standard also requires calibration. I served in the US Navy 
submarine service as a Navigation Electronics Technician. We used a BRN-5 
LORAN receiver. We had two Cesium standards. Every inport period, we had to 
track LORAN for 10 days. While tracking LORAN we had a computer program 
that calculated the drift rate of each Cesium standard against the LORAN 
station being tracked. This data was entered into the computer where it 
applied a drift rate correction based on elapsed time from the calibration. 
This allowed us to track only two LORAN stations, in phase shift mode, to 
get a position fix.

Radio had to take their two Cesium standards to the tender for calibration 
every inport period. The shop did the same thing that we did in the 
navigation center. We could not do the calibration of the Radio room 
standards due to Tempest requirements (we could not run signal lines into 
or out of the radio room).

73
Glenn
WB4UIV



>By the way, the 3rd option is a cesium beam standard. They do not require
>any sort of calibration like the Rhubidium standards do; are at least an
>order of magnitude more accurate than Rhubidium, but they cost a lot more;
>and the cesium beam tubes actually burn out with usage. Used, working, they
>used to go for about $800 - up.
>
>
>73  Ed Tanton N4XY <n4xy at earthlink.net>
>
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