[time-nuts] Fleamarket find
Arthur Dent
golgarfrincham at yahoo.com
Mon Oct 18 23:16:18 UTC 2010
Ed Palmer wrote:
"The second board is 05061-6165. It includes frequency divider,
amplifier, and level adjust circuitry to make it plug-compatible
with the older oscillator. Here's a picture of that board.
Notice the 4 SMB connectors and the four single lead connectors
- just like the older oscillator. The 110 VAC heater on the old
oscillator isn't needed with the 10811 so they didn't duplicate that."
++++++++++++++++++++
I don't have a newer HP 105 to compare and only have the schematic
for the newer oscillator assembly that shows that it used the 10811
oscillator and a couple of circuit boards. It seems HP loved to make
revisions.
Here is another board similar to the one you just attached a link to.
This one has the same connections as the one you have to connect to
the older oscillator (this one was modified and in a piece of non-HP
equipment)and although it appears at a glance to be functionally
identical to your board, has a far different layout. The HP number
on this board is 05061-6199
http://farm5.static.flickr.com/4126/5095072396_83f549bd25_b.jpg
-Arthur
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