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AC0XU (Jim)

Sat, Oct 21, 2023 12:14 AM

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

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

EM

Ed Marciniak

Sat, Oct 21, 2023 2:36 AM

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@lists.febo.com
Sent: Friday, October 20, 2023 7:14:59 PM
To: time-nuts@lists.febo.com time-nuts@lists.febo.com
Cc: AC0XU (Jim) James.Schatzman@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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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@lists.febo.com> Sent: Friday, October 20, 2023 7:14:59 PM To: time-nuts@lists.febo.com <time-nuts@lists.febo.com> Cc: AC0XU (Jim) <James.Schatzman@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 _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

JH

john.haine@haine-online.net

Sat, Oct 21, 2023 9:18 AM

150ps delay line?

-----Original Message-----
From: AC0XU (Jim) via time-nuts time-nuts@lists.febo.com
Sent: Saturday, October 21, 2023 1:15 AM
To: time-nuts@lists.febo.com
Cc: AC0XU (Jim) James.Schatzman@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

time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an
email to time-nuts-leave@lists.febo.com

150ps delay line? -----Original Message----- From: AC0XU (Jim) via time-nuts <time-nuts@lists.febo.com> Sent: Saturday, October 21, 2023 1:15 AM To: time-nuts@lists.febo.com Cc: AC0XU (Jim) <James.Schatzman@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 _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

JC

James C Cotton

Sat, Oct 21, 2023 10:07 AM

I ordered two from eBay for entertainment. I think delay line might be correct, since one description I found is "rise time filter".

Jim, n8qoh

Get Outlook for Androidhttps://aka.ms/AAb9ysg

From: john.haine--- via time-nuts time-nuts@lists.febo.com
Sent: Saturday, October 21, 2023 5:18:38 AM
To: 'Discussion of precise time and frequency measurement' time-nuts@lists.febo.com
Cc: 'AC0XU (Jim)' James.Schatzman@ac0xu.com; john.haine@haine-online.net john.haine@haine-online.net
Subject: [time-nuts] Re: Identifying Picosecond Pulse Labs Part?

150ps delay line?

-----Original Message-----
From: AC0XU (Jim) via time-nuts time-nuts@lists.febo.com
Sent: Saturday, October 21, 2023 1:15 AM
To: time-nuts@lists.febo.com
Cc: AC0XU (Jim) James.Schatzman@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

time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an
email to time-nuts-leave@lists.febo.com

time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

I ordered two from eBay for entertainment. I think delay line might be correct, since one description I found is "rise time filter". Jim, n8qoh Get Outlook for Android<https://aka.ms/AAb9ysg> ________________________________ From: john.haine--- via time-nuts <time-nuts@lists.febo.com> Sent: Saturday, October 21, 2023 5:18:38 AM To: 'Discussion of precise time and frequency measurement' <time-nuts@lists.febo.com> Cc: 'AC0XU (Jim)' <James.Schatzman@ac0xu.com>; john.haine@haine-online.net <john.haine@haine-online.net> Subject: [time-nuts] Re: Identifying Picosecond Pulse Labs Part? 150ps delay line? -----Original Message----- From: AC0XU (Jim) via time-nuts <time-nuts@lists.febo.com> Sent: Saturday, October 21, 2023 1:15 AM To: time-nuts@lists.febo.com Cc: AC0XU (Jim) <James.Schatzman@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 _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com