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Why does Huber+Suhner report their RG400 cable as having max frequency of 6GHz?

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matthuszagh:

--- Quote from: Neomys Sapiens on December 10, 2023, 12:33:37 am ---
--- Quote from: matthuszagh on December 09, 2023, 05:50:16 pm ---
--- Quote from: Neomys Sapiens on December 09, 2023, 05:33:20 pm ---BTW, while 6 GHz is a bit low, I would not consider it beyond 8 GHz.

--- End quote ---

Why's that? Shielding effectiveness? Something else?

--- End quote ---
1.) see above post. I personally would not refer to a 3dB point as being 'within the usable BW' when I could get better.
2.) shielding indeed.
3.) At those frequencies, most signals occupy significant bandwith. Too much dispersion.

--- End quote ---

Do you actually mean dispersion? The variation of permittivity of PTFE as a function of frequency (and therefore phase velocity) at 8 GHz is very small. Are you instead referring to attenuation as a function of frequency? If that's the case, do you stick to lower loss dielectrics like polyethylene foam at 8 GHz?

Neomys Sapiens:

--- Quote from: matthuszagh on December 10, 2023, 04:52:38 pm ---
--- Quote from: Neomys Sapiens on December 10, 2023, 12:33:37 am ---
--- Quote from: matthuszagh on December 09, 2023, 05:50:16 pm ---
--- Quote from: Neomys Sapiens on December 09, 2023, 05:33:20 pm ---BTW, while 6 GHz is a bit low, I would not consider it beyond 8 GHz.

--- End quote ---

Why's that? Shielding effectiveness? Something else?

--- End quote ---
1.) see above post. I personally would not refer to a 3dB point as being 'within the usable BW' when I could get better.
2.) shielding indeed.
3.) At those frequencies, most signals occupy significant bandwith. Too much dispersion.

--- End quote ---

Do you actually mean dispersion? The variation of permittivity of PTFE as a function of frequency (and therefore phase velocity) at 8 GHz is very small. Are you instead referring to attenuation as a function of frequency? If that's the case, do you stick to lower loss dielectrics like polyethylene foam at 8 GHz?

--- End quote ---
To say it more precisely, I was thinking about group delay variation. But you seem to be right here. Regarding the polyethylene foam dielectrics: they help, but they do not make the complete cable automatically better. I have to admit that I'm working in areas spared from the usual monetary pressure. So I get the best cable that fits the budget and has (optimally) lots of margin in every parameter. This has carried over into my own lab. When you have ever handled (for example) the heavy duty Sucoflex variant with a PU mantle, which flexes and bends almost like an oversize test lead, it is hard to go back.
 ::)

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