[time-nuts] Chinese NTP Time server

[Bob Bownes]

Brian,

TICC is one answer, HP 5370 would be another. They can often be had quite
reasonably on ebay and, short of a SRI counter, seem to be the standard.
There is one on ebay atm (item 401738800574) for 120 obo that, while
missing the red filter on the front, probably just needs to have the
timebase switch moved from 'EXT' to 'INT' on the back, (and maybe a jumper)
or to be fed 10Mhz from one of your GPSDOs. Assuming it is good. I've had
good luck with this particular problem.

Bob

On Tue, Jan 7, 2020 at 4:13 PM Brian Lloyd <brian at lloyd.aero> wrote:

>
> OK, I tried the AD8055A op-amp in the buffer. Output now looks exactly
> like the output of the OCXO (square wave). Unloaded output is 3.2Vpp.
> Output into 50 ohms is +10dBm, nice and clean. So, if you buy one and
> want to add the components to get 10MHz sq-wave output, you need to add
> a TBA 1-1219 isolated DC/DC converter, and an AD8055A op-amp. Works
> great. Mouser has them in stock. While I do have hot-air SMD-rework
> capability, the SOIC-8 package was easy to hand-solder with a small tip
> on my Hakko solder station so I didn't have to go get solder paste.
>
> BTW, the price quoted for a unit WITH 10MHz output was $350,
> substantially more than the $201 for the non-10MHz unit. For $10 in
> parts I am happy. OK, it isn't sine-wave output. I don't have anything
> that requires a sine wave reference.
>
> So this meets my needs for NTP stratum-1 for the machines in my house,
> and 10MHz for my radios.
>
> Still, I wish to graduate to full time-nuttery status. I would like to
> do the ADEV analysis. Other references I have kicking around:
> Thunderbolt, Leo Bodenar GPSDO, Ephratom LPRO-101 Rb. Unfortunately I
> don't have a good, free-running OCXO for short-term comparison. Still, I
> suspect the Rb should work well enough for that. Also, the only device I
> have to DO the comparison is a Fluke T7260a. Thinking about a TICC. Advice?
>
> Brian, WB5BL
> --
>
>
>  <https://www.lloyd.aero>
>
> Brian Lloyd
> 706 Flightline
> Spring Branch, TX 78070
> brian at lloyd.aero <mailto://brian@lloyd.aero>
> +1.210.802.8359
>
>
>
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