All, I just got a Trak Systems 8821E-20 GPS Clock at a very reasonable price.
Before the purchase, I was not able to retrieve any specific information on this model, but as it turns out, it has a Isotemp OCXO91-17D 10 MHz oscillator disciplined by what appears to be the Motorola B8121Z1116 Oncore 8-channel receiver module. I have uploaded a couple of photos for your viewing pleasure. The DAC (U7) to the left of the OCXO is an AD7849AR, by the way. I found that some of the RS-232 queries and commands listed in the technical manual for the 8821A-11/12 GPS Clocks work with the 8821E-20, but far from all. Obviously, I would love to have a manual for the 8821E-20. Does any of you have any kind of documentation on the 8821E-20? Best regards Ole
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