So, is everybody out there using the 1083B GPS for frequency? For some reason, we're still using the LORAN C to monitor our rubidium, and the 527E to compare a ref to sig. This seems to be kind of dumb since the GPS takes the place of all three items and is more accurate. Plus we have to calculate the offset daily since the rubidium is not cal'd! We've got the GPS hooked up and working, just not using it.
Also, if you're using GPS, what do you have the measure time set to? 1 sec seems to jump around alot. Does this setting even matter (besides resolution)? Are there any other settings that really make a difference when measuring the freq offset? The allen variance? Thats a kind of confusing value.
I appreciate any input. :D
Jesse
In the counters section of Eglin AFB we use the 1038B GPS but we still use the Loran-C setup for the rest of the lab. We are currently trying to work on getting an amplifier so that we can use the 1038B for the whole lab but I have no word on that yet.
Here at Offutt AFB we are using our 1083B as a frequency standard for the whole lab. We are using the Tracor 525 Frequency Distribution Unit to amplify the signals. The Loran-C is still being powered and compared against the GPS as a redundant system incase there is ever a problem with our 1083B. When using the 1083B it is best to manually enter your location and put the unit on 3D hold mode. Doing frequency offset measurments with the 1083B, the readings will jump around on the 1 second mode. I was told that it's completely normal for it to do so. You will want to use the 10,100 or 1000 sec modes. The 1 sec mode should work fine for crystal oscillators which in general are only accurate to a few parts to the -10th for really good ones. But with those we usually use the 527 Frequency comparitor using the 1083B as the reference. Hopefully this helps. [/img]
I was wondering if anyone out there is using an UPS to keep the 1083B going when power is lost?