Harry Dalek wrote:I have not played with Satellites for a while not sure how often your waiting for them to update your device ,but i found it takes a few bit of the day up tracking them getting things ready.
Start-up from 'cold' (a cold start, the receiver has been off for more than 30 minutes) takes around 30 seconds to acquire the satellites in view that are more than 10 degrees above the horizon and with a strong enough signal. With the newer additional systems that's around 30-35 satellites providing navigational and time/frequency data. With a 'hot-start' (a shorter off-time), that comes down to 1-2 seconds.
The updates are once per second once in tracking mode from all satellites above 10 degrees and with a suitable signal-to-noise ratio, better than -33db.
However the oscillator the receiver is controlling takes up to an hour to stabilise its temperature - it's in a temperature controlled oven at around 65 celcius. Photo and datasheet below...
This oscillator isn't made by Isotemp now, it's been replaced by smaller and less power-hungry devices with generally better specifications. The oven part takes about 6W at start-up which drops to about 2W once up to temperature at my typical ambient temperatures, around 30 C. The date code may seem odd, but it's the 48th week of 2000, I bought it mid-2001. It's been on for 99%+ of those 20 years.
Steve A.
- Isotemp 1.jpg (155.3 KiB) Viewed 6754 times
Isotemp OCXO134-10Spec.pdf- (92.79 KiB) Downloaded 191 times
i have perhaps 3 or 4 from some mixed part boxes electronic place sold down here in the 80s .
,i might ask Richard labguy what he thinks he's good at this stuff ...it would be very useful tool for sure ,i have been wanting something like this for some time .