[time-nuts] high rev isolation amps

[jimlux]

On 3/26/16 2:30 PM, Rob Sherwood. wrote:
> You cannot add the directivity and gain.  Doesn't work that way.  Rob, NC0B.
>

Yeah, I kind of figured that after getting the S parameters from 
minicircuits.

> Sent from my iPad
>
>> 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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