Ball Efratom PTB-100
The Ball Efratom PTB-100 is a Rubidium frequency reference plug-in for the TM500 system.
It provides 10 MHz sine and TTL output, and 1 MHz TTL output.
The PTB-100 appears to be essentially a Ball Efratom FRK-series rubidium standard module on a power supply and divider board plugging into the TM500 backplane.
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