[time-nuts] New NTBW50AA

Bob Camp lists at rtty.us
Sun Sep 8 12:03:27 EDT 2013


Hi

One of many ways to compare the two frequencies:

Run one into the trigger input on your scope.
Run the other into the main channel on the scope. 
Crank the sweep up as fast as practical.
Get out the clock to start monitoring elapsed time.

A nanosecond per second is 1 ppb, you should be able to get it to 0.01 ppb. That would be a nanosecond per 100 seconds. It's a lot more likely you will be looking at 10 ns per 10 seconds and 10 ns per 1,000 seconds, but the approach is the same.

Bob

On Sep 8, 2013, at 11:36 AM, quartz55 <quartz55 at hughes.net> wrote:

> I like that lambda supply Bob, nice size compared to the slug I'm using.
> 
> It's at 5.6e-10 this morning.  I think I'll move the antenna back to the original site and see if it works there, it's out in the middle of the deck right now and I'm sure the wifey won't like it staying there.
> 
> The switching supply module in it is Datel TPB-5/5-12/1-Q48,
> 
> One question with LH.  When it's full screen and I hit F11, it minimizes to a tiny bar.  And the only thing it will do from there is full screen and will only toggle between the two.  How do I get it back to a normal window size?  Used to toggle between a window and full screen.
> 
> It's putting out +12.4dBm and with my LPRO driving my service monitor, I could split it and still have plenty dB, it's reading 10000000Hz, that's the finest resolution on the service monitor in rx mode, 1Hz.  Seems to be a good filtered 10MHz with no harmonics that I can see in the service monitor, haven't tried it into a rx yet.  The LPRO had all sorts of harmonics.
> 
> How do I compare the Nortel to my LPRO?  Feed them through a combiner into a scope?  What am I looking for in trying to calibrate the LPRO?  That's the second reason I got this thing.
> 
> I'm waiting for the XRef I bought from VK3HZ so I can hook this thing up to my TS-2000, that was my primary objective.  TS-2000 wasn't bad but when the fan comes on it wanders around 4Hz at 144 and that's with a bunch of cotton pads stuck around the ref osc.  The long term drift was more than 4 hz too.  I'd like to be able to read mHz with SpecLab when I get set up.  I realize the DSP will throw it off, but hopefully it'll be consistent.
> 
> You can see my latest screenshot and the rats nest on the bench showing the mongo PS.  I need to get this thing sorted and put in it's home.
> 
> Dave
> N3DT
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