[time-nuts] Minicircuits SYPD-1

[Jerry Hancock]

Gerhard, would there be any advantage to matching the transistors?  I have a pretty accurate curve tracer.

thanks,

Jerry


> On Dec 19, 2018, at 10:36 AM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> 
> 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.
>> 
> <bfr93PD.png><bfr93pd_S11.png>_______________________________________________
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