[time-nuts] LTE Lite installation comments

Bob Camp kb8tq at n1k.org
Sat Nov 29 22:43:51 EST 2014


If you are looking at the 10 MHz outputs and want to see what they are doing - feed a pair of outputs into a double balanced mixer. You will get an IF output that tracks the phase between the two outputs. Best to do it with 90 degrees of coax shifting things so you get a zero output. Track the voltage (maybe after a preamp) and you are measuring phase. Calibrate the mixer by changing the coax and you have pretty accurate information. 


> On Nov 29, 2014, at 11:12 AM, paul swed <paulswedb at gmail.com> wrote:
> Want to thank everyone for the various comments and insights of the LTE,
> filters, buffers etc.
> My unit is built up including dividers and distribution amps and simply
> need to drill a few holes in the front panel for on/off switch and a few
> status lamps some 16 BNC's.
> I want to thank both Bob and Charles for the comments on using 74HC or AS
> as line drivers with LPF filters. A pair of inverters per coax or 3 lines
> per 74HC14. Simple and effective for the 10' of coax on the bench
> distribution. I calculated Low Pass Filters for 10, 5, 1, and .1 Mhz. The
> older VLF radios use .1 Mhz as a reference. Certainly I can not speak to
> some of the detailed comments mentioned on Time-Nuts as to jitter etc. But
> I can say on a spectrum analyzer the outputs look very good. I used Saids
> inverters for the 1 PPS. I was considering RS 232 and RS 422 and may add
> those but less of a priority. It seems I always have coax around so this is
> a pretty nice way to get PPS to a project.
> So from discussions to real in a few days.
> Damn technology.
> I was beginning to believe the old basement Telco RB that drives my stuff
> was starting to fail. Darned if this project didn't prove it. I could see
> the RB jitter and occasionally loose lock. OK another project on the list.
> Regards
> Paul
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