[time-nuts] Minicircuits SYPD-1

[Gerhard Hoffmann]

I had once some leftover space on a home-etched test board and put

one of these BJT mixers in a corner; just for fun, I had no application 
in mind

so they collected some dust.


Transformers are 1:4 Macom MABAES0061 or Pulse Engineering CX2047 or 
sth. like that.

avail. at DigiKey for $1.50 . Transistors are BFR93 since they happened 
to be on the table.

I checked the PD just now since it was mentioned.

Optimum return loss seems to occur at 9 dBm, the sweep goes from 2 to 
100 MHz.

10 MHz is the sweet spot at this level. I did not calibrate the VNA.

Cheers, Gerhard


Am 19.12.18 um 16:57 schrieb Attila Kinali:
>
> There is a decent alternative: Use two transformers and 4 2N2222 to
> do your own mixer. The quality of it, according to NIST[1] is pretty
> good. I assume that any other NPN transistor of similar make-up will
> also do and lead to same/similar performance.
>
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