You need to use a mixer with low dc offset for best results.
Try one of the Minicircuits phase detectors (RPD-1, MPD-1, SYPD-1 etc)
These have low dc offset and dc offset drift.
Bruce
Raj wrote:
Hi Dan,
Low tech. Yes! IMHO I think its easier for my mind to track an analog
indication of Delta-V. I am more analog oriented.. my son OTOH may be able to
read a last digit flickering digital display better than me!.
I am other wise thinking of a DIY gizmo:
Mix two signals in an SBL1 or Eq.
Take the phase/DC IF difference out
Make a zero crossing detector or similar
Timimg the event. Wait for the event in other words!
Twiddle the preset again and see what happens.
The human mind does a lot more processing than the above with an
analog display..
Cheers
Raj, vu2zap
Raj wrote:
I was thinking of feeding two 10 Mhz signals to two ports of a SBL-1 or similar
and taking the DC
output at the IF port into an opamp or analog meter. This was visually easier
to adjust the drift between two frequencies by just watching the needle move. A
stationary needle over a couple of hours would be the best!
Raj, I did exactly this but with an old chart recorder attached to the mixer IF
port. This allows one to leave the room and not have to watch for hours or
days. I was able to adjust my -hp- rubidium unit this way against gps to
better than one cycle per day.
Low tech but effective.
Dan
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