measurement time-nuts@febo.com
Sent: Thursday, August 7, 2014 6:11 PM
Subject: Re: [time-nuts] Effects of noise on EFC line? - Resolved
Hi
Your EFC line is probably bypassed internally to the OCXO. A 3db modulation
bandwidth beyond 1 KHz is unlikely. A modulation bandwidth below 100 Hz
b...@evoria.net said:
So, I may throw another cap on it, but it seems to be clean down to what I
can measure at the OCXO on my old Tek 455 with an X10 probe.
Another thing to consider when chasing that sort of problem: How much are you
picking up with your scope probe and/or its ground wire?
Hi
Your EFC line is probably bypassed internally to the OCXO. A 3db modulation
bandwidth beyond 1 KHz is unlikely. A modulation bandwidth below 100 Hz is
quite possible.
Next thing to consider is that the EFC does FM on the OCXO. Phase noise is PM
modulation. FM is 1/Fmod relative to PM. If
he is on the right truck, just look around in your testing environment,
do you have shielded test set up, common ground for all the test gears ?
On 8/7/2014 3:58 PM, Hal Murray wrote:
b...@evoria.net said:
So, I may throw another cap on it, but it seems to be clean down to what I
can
of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, August 7, 2014 6:11 PM
Subject: Re: [time-nuts] Effects of noise on EFC line? - Resolved
Hi
Your EFC line is probably bypassed internally to the OCXO. A 3db modulation
bandwidth beyond 1 KHz is unlikely. A modulation
Thanks to everyone for their comments, and especially to Bill, WB6BNQ for cast
a jaundiced eye on my schematic.
The problem turned out to be in the design of my 5V rail on the PCB. There is
a 2.5 inch run from the 5V regulator over to the hex driver (74HCT365) that
outputs two signals of
