[time-nuts] What does PCB with 10811 oscillator do?
IK1ODO at spin-it.com
Sat May 21 15:33:50 EDT 2005
At 19.01 21/05/2005, David Kirkby wrote:
>I bought a 10811-60111 which was attached to the PCB shown in this photograph:
>Can anyone tell me what it is? It seems to have some logic on it (74LS90N,
>74LS158N) a pot for the fine adjustment of frequency, a couple of trimmer
>capacitors, a Motorola 1820-1052 and another chip that looks like
>1820-n439, but I may be wrong.
There is a PLL to lock an external frequency reference in the 1-5-10 MHz
range, some buffers/multiplexers for the oscillators, power supply
stabilization for the oscillator, and the EFC circuit. This is definitively
the oscillator board of HP 5328A/H99 or /H98 or /E22 or AN/USM-459.
The schematic is online (for a couple of days) at
www.spin-it.com/download/5328A.pdf . It comes from LOGSA, so HP should be
Look around page 175.
73 de Marco IK1ODO
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