K6OQK
Date: Thu, 10 Jan 2013 10:48:38 -0800
From: Ed Breya
Subject: Re: [time-nuts] Vectron GPSDO Oscillator stranges...
Can you completely swap the Vectron crystal oscillator modules between
the Datum units? Maybe the fault lies in the other part. If they are
GPSDOs, each must have a DAC some
tronics. Never heard
of them. I'll see what google tells me. I don't really need the DC
to DC converter as I never run the thing off of 12 Volts, but I've
thought about it.
Thanks,
Burt, K6OQK
Date: Thu, 10 Jan 2013 10:48:38 -0800
From: Ed Breya
Subject: Re: [time-
Oops - regarding that capacitance test on the tuning line, I meant to
say "up to several uF or more." You can start small to see if there's
any effect. It all depends on the impedance of the tuning line
circuitry, and the existing amount of filtering - you may need quite a
bit of C to swamp it
Can you completely swap the Vectron crystal oscillator modules between
the Datum units? Maybe the fault lies in the other part. If they are
GPSDOs, each must have a DAC somewhere driving the tuning control line
to the VCXO, The 10 kHz may be the DAC serial data rate, or a PWM rate
for fine tuni
Gang,
I have two DATUM 9390-52054 Disciplined Oscillators that use a
Vectron International model 716Y2690 crystal oscillator module. One
of the two units is showing 10 kHz sidebands about 35 dB down from
the main 10 MHz carrier, and looking at them on my spectrum analyzer,
they appear to be
