Re: [time-nuts] Old Crystal.

Using the DG8SAQ Vector Network Analyzer to identify an unknown component https://www.youtube.com/watch?v=Ao653tz1kVE actually it has a special program made for analyzing crystals Greetings and 73 KJ6UHN Alex On 3/1/2021 12:32 AM, Magnus Danielson wrote: Hi, On 2021-03-01 01:23, Attila

Re: [time-nuts] Old Crystal.

My response got lost in the Internet, so I repeat the info. If you have access to a Network Analyzer, either Scalar or Vector,  you can measure the crystal parameters. You need a test fixture (it could be homemade) to convert the 50 Ohm analyzer impedance to 12.5 Ohm and you very slowly sweep

Re: [time-nuts] Old Crystal.

Hi Missing step from that YouTube video: Stuff a fixed resistor into the 150B and calibrate the Rm per the manual. Without that, your resistance numbers can be pretty far off. In a production setting some of the Saunders gear got “calibrated” (or at least checked) each time the frequency

Re: [time-nuts] Old Crystal.

G3UUR and K8IQY have simple test circuits for measuring crystal motional parameters. G3UUR is great for comparing or matching a batch of similar-cut AT crystals. The K8IQY method is a bit more comprehensive for "unknown" crystals and involves very tiny step sweeping around the resonance you're

Re: [time-nuts] Historical question

Magnus, the first HP oscillator has been studied about as much as is possible. That is not my interest. I am looking at the HP-100 family of frequency standards. On Mon, Mar 1, 2021 at 12:36 AM Magnus Danielson wrote: > Hi, > > On 2021-03-01 00:17, Jeremy Nichols wrote: > > Does anyone know

Re: [time-nuts] Old Crystal.

This (see jpeg picture) crystal from Morion seems to have a Q of 1147576, as measured on a Saunders 150B. Youtube video of the 150B in action: Parameters from the 150B: Holder, Cs (pF), Ct (pF), Fs (MHz), Fp (MHz), Rm, C0 (pF),Cm (pF), Lm (uH), Qu Glass,

Re: [time-nuts] Old Crystal.

Hi > On Mar 1, 2021, at 3:32 AM, Magnus Danielson wrote: > > Hi, > > On 2021-03-01 01:23, Attila Kinali wrote: >> On Sun, 28 Feb 2021 18:35:57 -0500 >> Dan Kemppainen wrote: >> >>> If any of you have any suggestions on where to find information on how >>> to get something like this to

Re: [time-nuts] Old Crystal.

Hi > On Mar 1, 2021, at 12:52 AM, Ed Palmer wrote: > > On 2021-02-28 5:53 PM, Dan Kemppainen wrote: >> Hi All, >> >> I've picked up a couple of old crystals. Mostly because they look neat. >> They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm >> thick. Was able to get them

Re: [time-nuts] U-blox F9T performance (was: U-blox teaser)

On 01/03/2021 00:52, Thomas Abbott wrote: Hello Time Nuts, first post from a long-time lurker. In late 2019 I evaluated the Ublox F9T for a project. Here is a graph of the time difference between PPS outputs of two RCB-F9T boards on the bench. Each had a U-blox dual-band ANN-MB-01-00 antenna,

Re: [time-nuts] Old Crystal.

Hi, On 2021-03-01 01:23, Attila Kinali wrote: > On Sun, 28 Feb 2021 18:35:57 -0500 > Dan Kemppainen wrote: > >> If any of you have any suggestions on where to find information on how >> to get something like this to oscillate properly, guess at correct >> parameters, or even measure any of the

Re: [time-nuts] Historical question

Hi, On 2021-03-01 00:17, Jeremy Nichols wrote: > Does anyone know how many of its “first family” of frequency standards HP > made? That would be the HP-100A (starting in 1943) through HP-100E (ending > 1967). Just curious—I have a 100E, made in or after 1961. As I recall it, the HP200A was the

Re: [time-nuts] Old crystal

They might be for an older version of the 5110A. Mine has a packaged 5 MHz TXCO like the one in the early 5061A. That 5100A/5110A combo was a real show stopper when it came out. Mine still works nicely when I switch it on but it's not really practical for most purposes. It does all the frequency

[time-nuts] Old Crystal.

On 2021-02-28 5:53 PM, Dan Kemppainen wrote: Hi All, I've picked up a couple of old crystals. Mostly because they look neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at about 1 mm thick. Was able to get them to oscillate using a Colpitts circuit. They will oscillate at 2.851Mhz