[time-nuts] New 10 MHz Distribution Amplifier

[Bruce Griffiths]

Martyn Smith wrote:
> I read with interest about the new 10 MHz distribution amplifier.
>
> But I agree with everyone, it's the specs that are missing that are
> important.
>
> But I wanted to take one comment up about AGC.
>
>   
It depends how the AGC is done, there are some really poor examples for 
sale.
> My company makes a nice distribution amplifier and we do have AGC.  The nice
> thing here is that a +7 dBm input (e.g PRS10 output) will give you up to +13
> dBm output.
>
> Despite the AGC we still achieve good phase noise (-135 dBc/Hz @ 1 Hz with
> a -168 dBc noise floor) together with 130 dB isolation and 10 ps/C phase
> stability.
>
>   
The phase noise at 1Hz offset is about 15dB or so higher than the state 
of the art.
The effect of AGC should be most noticeable at low offsets.
A phase tempco of 10ps/C is a bit for high precision work.
> I suspect this low cost unit has a -140 or -150 dBc noise floor.
>
> But our unit costs a lot more than this low cost design, so maybe I'm not
> being fair in comparing.
>
> www.ptsyst.com/DA1-100-10-B.pdf has all our specifications.
>
> I could probably talk our sales manager in a once off big discount for time
> nuts readers, but I suspect it would still be out of the range of amateurs.
>
> Send me an email if you are interested (martyn at ptsyst.com)
>
> Martyn
>   
Bruce