On 10/03/2014 12:35, John Rehwinkel wrote:
Thank you for taking the photos and posting them. I particularly like the
little reed for calibration.
I thought it was clever too, and it works pretty well - it's easy to turn the
dial until the strobe freezes the reed motion. That reflector you found was
just the thing, it looks great.
I was originally going to engrave the panel with high/low frequencies but opted
for a simple 0 - 10 as I was unsure how things would age; I did realise the
need for calibration adjustment pots in that case.
Indeed. The frequency window with the side-view dial would be hard to build,
but it's easy to read and a nice touch in the commercial product.
I'm also playing with the caps in the multivibrator to extend the range and
reduce the range overlap a bit. In practice I just plug it into a frequency
meter (I suppose I should build an all-valve nixie readout frequency meter to
go with it now).
With an all-valve GPS disciplined reference! And the biggest valve of all will
be the caesium fountain, right?
- Cheers,
John
This is the reflector http://www.ebay.co.uk/itm/120982253359 (all sold
now). I cut the light fitting off and enlarged the hole to 32mm using a
sheet metal hole punch. The reflector makes the strobe! I would not
have proceeded with the build until I had got the right one. It is just
perfect.
All valve GPS Rx added to my to-do list. But I think a crystal
oscillator or mains frequency derived gate might be easier for the Mk
1. Perhaps a dekatron counter?
Grahame
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