[time-nuts] GPS splitter measurements

[Magnus Danielson]

On 10/12/2012 02:25 AM, Ed Palmer wrote:
> The HP / Symmetricom 58536A has a gain spec of 0 +-3 db so something is
> clearly wrong.

Agreed. I didn't have the spare energy to follow up on that.

> Did you power it through a spare port?

Yes. Port 4. Will look at that again.

> Also, the isolation spec is 26 db @ L1. The 50 db spec is for L1 +- 40 MHz.
>
> I looked inside mine and found that there's an input filter(-1db), 21 db
> amp, 4 way resistive splitter(-12db), output filter(-4db), and 4 db pad.
> That matches your measurement of 28 db isolation - no power is required
> for that.

Indeed. But I want propper gain and group delay measures too.

It was a fun lab to do just to get started.

Cheers,
Magnus