Re: [time-nuts] HP5061B Peak to Valley Ratios

> We are having trouble getting beam current on our #2 HP5061B. Ion > current has gone down in a week from 10 to zero. It looks like the rf > chain is working normally. Both HV power supplies had to repaired. > Beam current is all the way up and which gives 2 on the meter. We are > preparing to

[time-nuts] HP5061B Peak to Valley Ratios

We are having trouble getting beam current on our #2 HP5061B. Ion current has gone down in a week from 10 to zero. It looks like the rf chain is working normally. Both HV power supplies had to repaired. Beam current is all the way up and which gives 2 on the meter. We are preparing to do the Low

Re: [time-nuts] GPS first LO need to be locked?

Hi > On Apr 1, 2017, at 11:18 AM, paul swed wrote: > > Thanks everyone but I am working on an austron 2201a so all the discussions > on modern methods won't help. Whats is interesting is indeed the 2201 down > converts to 80KHz and the does sample in an IQ fashion. Its all

Re: [time-nuts] TAPR TICC boxed

Hi The whole delay difference thing does get into a “do you care?” sort of category. The testing process you are doing may well calibrate out (or ignore) an offset of this nature. This is quite true in a number of TimeNut sort of tests. Bob > On Apr 1, 2017, at 4:02 AM, Bruce Griffiths

Re: [time-nuts] GPS first LO need to be locked?

Thanks everyone but I am working on an austron 2201a so all the discussions on modern methods won't help. Whats is interesting is indeed the 2201 down converts to 80KHz and the does sample in an IQ fashion. Its all discreet chips and such. Easily traceable and logical. I think I have what I asked

Re: [time-nuts] TAPR TICC boxed

Hi There are low(fish) leakage / low capacitance / high speed transient suppressor diodes out there. The aren’t going to do anything good in a 1 megohm environment. They are quite useful in lower impedance circuits. Bob > On Apr 1, 2017, at 1:49 AM, Scott Stobbe

Re: [time-nuts] TAPR TICC boxed

The common mode propagation delay dispersion is also likely to be significant unless one uses an SiGe ECL/CML comparator. Calibrating this or actually the differential dispersion between channels is an interesting but not insoluble issue. Bruce > > On 01 April 2017 at 18:49 Scott Stobbe

Re: [time-nuts] TAPR TICC boxed

Also interesting the LTC6752 is rail-rail input. Any rail-rail input opamp I've used ends up with an ugly bump in input offset voltage transitioning from the nmos or npn diff pair to the pmos or nmos. I'm not sure how good or bad a rail-rail comparator may behave when common-mode biased in that