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Wuerstchenhund:

--- Quote from: Rupunzell on January 31, 2015, 06:09:31 pm ---Any BNC at 10 Ghz, not gonna work. Any manufacture that rates their BNC to 18 Ghz is being extremely dis-honest and deceptive.

--- End quote ---

Yeah, well, it seems you don't get what 'rated' means. If a part is 'rated' up to 18GHz it merely means that it's properties up to 18GHz are known. It doesn't necessarily mean 'guaranteed to work great at' or 'zero loss at'.

You can rate a piece of string to 100GHz, no problem. It doesn't mean it's any good at that frequency, though.

As to what the manufacturer rating is worth, I certainly wouldn't trust a cheap part from a Chinese ebay seller but I an tell you from quite a bit of personal experience that the stuff you get from manufacturers like Huber & Suhner is pretty much spot-on. In fact, Huber & Suhner is one of the most renowed manufacturers for RF cables and stuff, and that's for a reason.

tautech:

--- Quote from: Wuerstchenhund on January 31, 2015, 10:10:54 pm ---
--- Quote from: Rupunzell on January 31, 2015, 06:09:31 pm ---Any BNC at 10 Ghz, not gonna work. Any manufacture that rates their BNC to 18 Ghz is being extremely dis-honest and deceptive.

--- End quote ---

Yeah, well, it seems you don't get what 'rated' means. If a part is 'rated' up to 18GHz it merely means that it's properties up to 18GHz are known. It doesn't necessarily mean 'guaranteed to work great at' or 'zero loss at'.

You can rate a piece of string to 100GHz, no problem. It doesn't mean it's any good at that frequency, though.

As to what the manufacturer rating is worth, I certainly wouldn't trust a cheap part from a Chinese ebay seller but I an tell you from quite a bit of personal experience that the stuff you get from manufacturers like Huber & Suhner is pretty much spot-on. In fact, Huber & Suhner is one of the most renowed manufacturers for RF cables and stuff, and that's for a reason.

--- End quote ---
While you are both to'ing and fro'ing somebody should state a load impedence which WILL make a massive difference at those frequencies.

Wuerstchenhund:

--- Quote from: joeqsmith on February 01, 2015, 12:00:39 am ---LeCroy is not a mainstream brand.   When I think LeCroy, I think physics.  Well, not so much anymore.   My 7200 even has some support in the software for TOF.  Crude yes but the fact it has anything gives an idea of their target market back then.   
--- End quote ---

Was the same with me. I knew they existed but never considered them until two years ago when I had the chance to get a WaveRunner LT224 for cheap. Now I regret not having looked at their scopes earlier.


--- Quote ---They still offer a 1Meg input driver but price for a few new ones was more than the Wavemaster cost.   

--- End quote ---

I see them occasionally on ebay, and usually for pretty excessive price tags.

I think LeCroy solved that pretty well with the current WavePro 7zi  and WaveMaster 8zi by giving each channel two inputs (ProLink and ProBus with BNC). Another solution I haven't seen anywhere else.


--- Quote ---It would make the old Wavemaster more useful as a general purpose scope.   I was playing around with a  few different op-amps to make a driver for the it.  These videos show a few of them. 



--- End quote ---

Interesting. It would certainly make the scope more useful for common application, and they wouldn't have to go very high bandwidth-wise (i.e. 500MHz). You could stick them in the case of an old ProBus probe (incomplete active probes often come up for little money).

Rupunzell:
Measure the return loss of that  Huber & Suhner adapter up to 18 Ghz, then we can discuss more. Manufactures can claim all kinds of what not, it is up to the user to verify their claims, not simply believe what is stated in print or advertised.



Bernice



--- Quote from: Wuerstchenhund on January 31, 2015, 10:10:54 pm ---
Yeah, well, it seems you don't get what 'rated' means. If a part is 'rated' up to 18GHz it merely means that it's properties up to 18GHz are known. It doesn't necessarily mean 'guaranteed to work great at' or 'zero loss at'.

You can rate a piece of string to 100GHz, no problem. It doesn't mean it's any good at that frequency, though.

As to what the manufacturer rating is worth, I certainly wouldn't trust a cheap part from a Chinese ebay seller but I an tell you from quite a bit of personal experience that the stuff you get from manufacturers like Huber & Suhner is pretty much spot-on. In fact, Huber & Suhner is one of the most renowed manufacturers for RF cables and stuff, and that's for a reason.

--- End quote ---

Rupunzell:
Load impedance is only part of a transmission line system.

Source impedance, termination-load impedance, connectors and transmission line all matter. If the currently common BNC worked past 110 Ghz, there would be no reason for connectors like N, TNC, SMC, SMB, SMA, WSMA, APC-7, APC-3.4, K, 2.92mm, 2.4mm, 1.85mm, V, and others.

When Ghz systems are discussed, connectors and the entire transmission line system performance matters.


Bernice



--- Quote from: tautech on January 31, 2015, 10:54:56 pm ---While you are both to'ing and fro'ing somebody should state a load impedence which WILL make a massive difference at those frequencies.

--- End quote ---

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