Re: [time-nuts] 5060A question...

In message [EMAIL PROTECTED], [EMAIL PROTECTED] writes : Since I got it working several years ago, my HP-5060A has a rather loud ~2KHz audible whine coming from it. It seems to be a result of the switching power supply in the A20 oven controller module. My units did the same thing, and I traced

Re: [time-nuts] xtal oscillator phase noise

Henk ten Pierick wrote: --snip-- It showed to be very difficult to come lower than what I have now. If can be the crystal. How can I decide? As an absolute minimum, you need to know the crystal dynamic (or motional) parameters - the crystal supplier should be able to provide these. If

Re: [time-nuts] 5060A question...

Hello, With reference the 2k noise, this indeed was coming from the circuitry in the A20 Oven Controller. We also had this in early 5061A from the original A11 Oven Controller. Actually this is the Hot Wire Ionizer ribbon inside the CBT being vibrated by the ac current flowing through it. It

Re: [time-nuts] xtal oscillator phase noise

Not really, it's the circuit topology determines whether a parallel or series resonant crystal is used. Your circuit appears to be a variant Just a comment about series vs parallel. The 10811 has a parallel resonant circuit and the E1938A has a series resonant circuit. The crystals used

Re: [time-nuts] xtal oscillator phase noise, parallel versus series

I think the main difference between parallel and series resonance is that in parallel resonance mode, the capacitance of the crystal holder and wiring to the crystal is part of the frequency determining parameters, and in series mode it is not. So it may have a slight effect on temperature

Re: [time-nuts] xtal oscillator phase noise, parallel versus series

I forgot to mention that the crystals for the E1938A had to be calibrated for series resonance at 10 MHz. Rick Karlquist N6RK Didier Juges wrote: I think the main difference between parallel and series resonance is that in parallel resonance mode, the capacitance of the crystal holder and

Re: [time-nuts] VP oncore question

Morris, The easiest thing is to connect a jumper from Pin 1 of the 10-pin header to one of the holes used to previously mount the battery. I would suggest putting a resistor (1-4.7K is fine) and diode in the middle of this wire to limit current in case of any mistakes and prevent any possibility

Re: [time-nuts] xtal oscillator phase noise

Grant Hodgson wrote: Henk ten Pierick wrote: --snip-- It showed to be very difficult to come lower than what I have now. If can be the crystal. How can I decide? As an absolute minimum, you need to know the crystal dynamic (or motional) parameters - the crystal supplier should

Re: [time-nuts] VP oncore question

Randy Warner wrote: Morris, The easiest thing is to connect a jumper from Pin 1 of the 10-pin header to one of the holes used to previously mount the battery. I would suggest putting a resistor (1-4.7K is fine) and diode in the middle of this wire to limit current in case of any

Re: [time-nuts] time stamping counters

Magnus, I was unable to respond to your message earlier; too many visitors too many diversions. Thanks for the info on the CNT-91; I have read the datasheet thoroughly and it would be VERY nice to own one, but too many $$ for me. I have downloaded the evaluation copy of Timeview. It works

Re: [time-nuts] time stamping counters

From: Pete [EMAIL PROTECTED] Subject: Re: [time-nuts] time stamping counters Date: Wed, 2 Jan 2008 18:58:44 -0700 Message-ID: [EMAIL PROTECTED] Pete, I was unable to respond to your message earlier; too many visitors too many diversions. Know the feeling. Thanks for the info on the CNT-91;