[time-nuts] Re: Identifying Picosecond Pulse Labs Part?

[Ed Marciniak]

I’d say those are step recovery diodes, likely used as a comb generator. You’d need a bias tee on one end and a dc block on the other to properly bias them, whether you’re going to self bias or inject a bias to get away with lower drive or possibly greater maximum output. Ideally, you’d have an input low pass filter with a drive impedance substantially lower than 50 ohms, like 5-10 ohms. Ideally the output would have a high pass filter that removes the fundamental that wasn’t converted.

Anyway, assuming you have the right stuff around to plug in without damage, and a SA that can handle up to +23 dBm in (or can with an attenuator), hit it with around +17 dBm and ramp to about +20 noting the change in harmonic content and frequencies you get useful output to.

________________________________
From: AC0XU (Jim) via time-nuts <time-nuts at lists.febo.com>
Sent: Friday, October 20, 2023 7:14:59 PM
To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
Cc: AC0XU (Jim) <James.Schatzman at ac0xu.com>
Subject: [time-nuts] Identifying Picosecond Pulse Labs Part?

I have acquire some Picosecond Pulse Lab parts, about 2 in long with SMAs at either end. They were advertized as DC block/2 GHz low pass filter.

However
a) It isn't a DC block - DC resistance from input to output is < 1 ohm.
b) It isn't a low pass filter - S12 is quite flat at 0 dB from 0 to 20 GHz.

Also, DC resistance from input or output to ground is infinite.

The only identification on it is "Picosecond Pulse Labs 9008". Any thoughts as to what these things are?

Thanks!
Jim

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