On 3/26/16 3:25 PM, Bruce Griffiths wrote:
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
Well, it's a bit inconsistent between gain, directivity and S parameters.
at 5.4 MHz the ZFL-500LN has the following S parameters @ 15 V in the
.s2p file (there's two units' measurements in the files)
S11 -35.5, -32.1
S21 29.7, 29.5
S12 -47.5,- 47.2
S22 -39.5, -28.3
On the other hand, the data sheet "typical data" says: at 5.4MHz 27.9 dB
gain, 26.5 dB directivity, which Minicircuits defines as isolation-gain
(implying isolation is 54.4)
http://www.minicircuits.com/pdfs/ZFL-500LN.pdf
Maybe there's some sort of assumption about source/load impedance (e.g.
not necessarily perfect 50 ohms)
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
