The SD30 is rated at 40 GHz, which should be about a 9 ps risetime.
I'm not sure who is doing the ringing.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
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Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Nice. That ringing is too soon to be the SMA->2.8 mm transition at the SD-30 input, so it could be a slightly battered SMA connector on the SD-24 or the first bend. You sure won't get that measurement quality for anywhere near the price elsewhere!
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
The connectors look like SMA, and that's only guaranteed to 18GHz. They may well represent enough of a discontinuity at 40GHz to explain the ringing you have got - it's about 40psec, too short for the cable between the modules, but about right for the distance from the connector into the module.
I tried some different cables and SD24s and the ringing is similar. It's probably in the SD30 head.
The SD24 step must be in the 18 ps sort of ballpark!
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
It could be (A)PC 3.5 that is almost like SMA (to 30 GHz, Precision Connector 3.5 mm, Coproduction of Amphenol and HP) or the 2.8 / 2.4 mm versions. All are somewhat SMA compatible, but if you insert a male SMA with a slightly long pin into an APC, it costs you a few 100$ because the APC center connector is isolated by air and a very thin mica disk. The mica even has
6 holes to minimize capacitance and it breaks immediately.
My HP54752A plugin has 2.4mm and 50GHz/9 ps risetime... I have barely used it for fear of killing it.
There is also the W connector (1mm) that goes up to > 100 GHz. I think it was first used on the HP8510XF network analyzer. That one is not even remotely compatible to SMA. I once was allowed to admire a W cal kit, but no way to put it to use :-)
PSPL used to make a shock-line step generator and a shock-line based sampling head. I think both are gone now.
There's not a lot of point in doing 100 GHz sort of TDRs and samplers. Signals like that don't go through connectors and cables very well.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
Spend $50 on a connector saver, and use it without fear!
Back in the day it was only the female connectors you had to admire from afar. ;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
Doesn't the original high impedance mic connector with a threaded lock ring predate both? The Switchcraft 2501 is an example. Unscrew the ring from the female and it's now a male connectors.
Plenty of those, and very overpriced red golf carts too. I'll probably had trouble finding an open handicap parking space tomorrow at the VA, because they refuse to park in their own lot. They not only park in the handicap spots, they wont share a spot so they take dozens of prime spots. It's too bad they don't get those $500 fines for illegal parking. The carts aren't street legal, and don't belong where cars & trucks park. One of these days one of them will be run over, or have their cart smashed by someone who doesn't see it in time.
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.
Are you sure they aren't street legal? They are in Alabama and Georgia. I believe they're banned from roads >35MPH, though. At some of the shopping centers here the golf cart parking spaces are closer to the door than the handicapped spaces. Kids as young as 14 drive 'em, too.
They are unlicensed, and can't be driven on public roads. All the roads inside 'The Villages' are private and owned by the retirement community so they are legal on their roads. Some people ignore the law, but drive in the right of way and cross roads after looking for cops. They petitioned the state for the right to cross a busy four lane highway, then demanded and got a private bridge over the highway built at taxpayer's expense.
The worst ar the people with power wheelchairs who ride right down the middle of the street, even those are only legally allowed to cross a road in a crosswalk. I have to dodge them, and even run off the road because they sit sideways to talk to someone on another power wheelchair to talk and block both lanes.
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.
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