[time-nuts] Looking for high reverse isolation amplifier

[Richard (Rick) Karlquist]

Can anyone direct me to an amplifier with:

1.  High reverse isolation
(over 40 dB).  Note: the spec of interest
is *reverse* isolation, not port to port
isolation in a distribution amplifier.

2.  Low phase noise
(less than -100 dBc/Hz at 1 Hz offset)

3.  Works at 200 MHz

The Q-Bit QBH-1401PM seems promising...if I
can get one.

If necessary I will build the amplifier
if I can get a known good schematic to follow,
but prefer to buy one.

Thanks in advance.

Rick Karlquist N6RK