[time-nuts] New to list and GPSDO questions

Azelio Boriani azelio.boriani at screen.it
Thu Jun 13 04:36:09 EDT 2013

As far as I can see from the pictures, the LED must be connected
directly to the PPS output so, yes, can be used. Removing the LED can
help in getting a full LVTTL swing.

On Thu, Jun 13, 2013 at 5:29 AM, Bob Stewart <bob at evoria.net> wrote:
> Hello to the list.  I saw on K3PGP's site a mention that the UT-41 GPS receiver had a 10KHz signal on-board so I decided, why not build a GPSDO for my "new" HP 5334B?  Unfortunately the one I bought doesn't have a 10KHz point, and the board doesn't even pull out the 1PPS signal from the chip.  So I've had to switch gears and will go with VE2ZAZ's board.  I've got a Motorola UT+ on order, but I was wondering about using the board's LED output as a sort of low-rent source of 1PPS.  Would the short term accuracy be too bad to even bother with?  Has anyone done any tests to see if the LED and 1PPS signals are essentially the same signal on one of these cheapo boards, or at least to find out how often the LED output is corrected?  The one I got has a Prolific PL-6313 chip.
> Bob - AE6RV
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