On Mon, Oct 22, 2012 at 1:00 PM, Tom Van Baak <[email protected]> wrote:
> There's a history to many of the GPSDO products you hear us talk about. > > I believe the original TBolt (fancy red case) did have an OCXO but it > wasn't particularly high quality. Perhaps Bob can shed light on this. > > 99% of TBolt's found on the surplus market today, and all the ones in the > TAPR deal, have a surprisingly good OCXO's. These were customer specials as > best we can determine, and never described on Trimble's web page. They are > in the plain brushed golden color aluminum case. > > The T'bolts in the gold, brushed aluminum case were provided to Grayson Electronics, at the time a part of the Allen Group (later Andrew and Commscope) for use in a receiver for an E911 locator system. The Trimble p/n was 41562-30 and, as far as I know, the only significant changes are the value of one Zener to allow the -12 V line to run at -7 V w/o asserting a fault and the change of the power connector to the "back" side of the board. Only the board is from Trimble; the sheetmetal and the attached 3dB coupler were provided by the OEM. Otherwise, I believe it to be the same unit that was in the red and silver Trimble case being sold at the same time (the one with the integrated dc-dc converters). 73, geo - n4ua _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
