[time-nuts] high rev isolation amps

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Mar 26 18:25:00 EDT 2016


On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote:
> You cannot add the directivity and gain.  Doesn't work that way.  Rob, NC0B.
> 
> Sent from my iPad
Minicircuits would disagree with that and its their amplifier.

Bruce
> 
> > On Mar 26, 2016, at 2:00 PM, "jimlux" <jimlux at earthlink.net> wrote:
> > 
> > 
> > 
> > Consulting the time-nuts hive mind here..
> > 
> > I'm looking for off the shelf connectorized amplifiers with very good
> > reverse isolation for doing things like intermod measurements (e.g. 2
> > signal generators followed by amps/pads into a combiner) and phase noise
> > measurements for a digital receiver.
> > 
> > 1-100 MHz kind of frequency range..
> > 
> > I've used ZFL-500LN (30dB gain, 27 dB directivity in the data sheet, which
> > I interpret as 57dB reverse) , ZX60-4016 (really more of a microwave amp,
> > and not so hot reverse wise.. 25 dB)
> > 
> > I'm not particularly cost constrained, so a higher power amp (which also
> > reduces distortion products from the amp) followed by pads is always an
> > alternative. _______________________________________________
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