Re: [time-nuts] HP 5316B External Reference

2020-07-13 Thread Richard (Rick) Karlquist
On 7/13/2020 9:46 AM, Wes wrote: Thanks again for your insight Rick. I'll be passing on acquiring one of these. Wes  N7WS I'm so glad you asked before buying. I hate having to tell something they wasted their money. Rick ___ time-nuts mailing

Re: [time-nuts] HP 5316B External Reference

2020-07-13 Thread Wes
Thanks again for your insight Rick. I'll be passing on acquiring one of these. Wes  N7WS On 7/13/2020 9:02 AM, Richard (Rick) Karlquist wrote: On 7/13/2020 6:26 AM, Wes wrote: Hi Magnus, I did have the manual when I posed the original question but I had not delved into the cal procedure

Re: [time-nuts] HP 5316B External Reference

2020-07-13 Thread jimlux
On 7/13/20 9:02 AM, Richard (Rick) Karlquist wrote: On 7/13/2020 6:26 AM, Wes wrote: Hi Magnus, I did have the manual when I posed the original question but I had not delved into the cal procedure until you mentioned it.  It seems to be a bit complicated for what it does. I wonder how

Re: [time-nuts] HP 5316B External Reference

2020-07-13 Thread Richard (Rick) Karlquist
On 7/13/2020 6:26 AM, Wes wrote: Hi Magnus, I did have the manual when I posed the original question but I had not delved into the cal procedure until you mentioned it.  It seems to be a bit complicated for what it does. I wonder how stable this is and how often might it need to be

Re: [time-nuts] HP 5316B External Reference

2020-07-12 Thread Magnus Danielson
Hi, Quick correction, I wrote "HP 5314A and 5314B" and meant "HP 5316A and 5316B" which is the relevant here. Sorry for that blunder. Cheers, Magnus On 2020-07-12 22:08, Magnus Danielson wrote: > Hi Wes, > > On 2020-07-12 00:51, Wes wrote: >> As I understand it this counter has an external

Re: [time-nuts] HP 5316B External Reference

2020-07-12 Thread Magnus Danielson
Hi Wes, On 2020-07-12 00:51, Wes wrote: > As I understand it this counter has an external reference input that > isn't used directly as the time base but injection locks the internal > time base.  Does anyone here know how well this works. Is using a > GPSDO as a reference a worthwhile accuracy

Re: [time-nuts] HP 5316B External Reference

2020-07-11 Thread Wes
Thank you Paul. On 7/11/2020 6:59 PM, paul swed wrote: Wes many of the HP sig gens and counters use that method I might guess starting in the 70s. They all lock very well to the external reference and are as good as the external reference is. One gotcha. It seems some people pull the

Re: [time-nuts] HP 5316B External Reference

2020-07-11 Thread Wes
Thanks for your insights Rick. The manual specifically states:  "The HP 5316B does not actually use the external input signal for a time base but locks-on to the signal with an injection-lock-multiplier. The external signal must be 1,5, or 10 MHz" My only experience with injection

Re: [time-nuts] HP 5316B External Reference

2020-07-11 Thread paul swed
Wes many of the HP sig gens and counters use that method I might guess starting in the 70s. They all lock very well to the external reference and are as good as the external reference is. One gotcha. It seems some people pull the oscillators to sell on auction sites. So if its missing thats a bit

Re: [time-nuts] HP 5316B External Reference

2020-07-11 Thread Richard (Rick) Karlquist
On 7/11/2020 3:51 PM, Wes wrote: As I understand it this counter has an external reference input that isn't used directly as the time base but injection locks the internal time base.  Does anyone here know how well this works. Is using a GPSDO as a reference a worthwhile accuracy improvement?

Re: [time-nuts] HP 5316B External Reference

2020-07-11 Thread Bob kb8tq
Hi The “typical” HP counter for many decades has phase locked an internal oscillator to the external reference. I have not seen any designs that use injection locking. Given the somewhat crazy math associated with injection locking, this is not a big surprise. By modern standards the 5316 is

[time-nuts] HP 5316B External Reference

2020-07-11 Thread Wes
As I understand it this counter has an external reference input that isn't used directly as the time base but injection locks the internal time base.  Does anyone here know how well this works. Is using a GPSDO as a reference a worthwhile accuracy improvement? Wes Stewart  N7WS