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From: John S <Sophi.2@invalid.org>
Newsgroups: sci.electronics.design
Subject: Re: what is wrong with RF people?
Date: Sun, 10 Nov 2024 18:58:46 -0600
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On 10/30/2024 6:53 PM, Cursitor Doom wrote:
> On Tue, 29 Oct 2024 16:17:58 -0700, john larkin wrote:
> 
>> On Tue, 29 Oct 2024 18:56:34 -0400 (EDT), Martin Rid
>> <martin_riddle@verison.net> wrote:
>>
>>> john larkin <jl@glen--canyon.com> Wrote in message:r
>>>> https://www.digikey.com/en/products/detail/macom-technology-solutions/
> MASW-007107-TR3000/4429770Apparently
>>>> "DC" means 2 GHz to these people. They test it with 8 pFseries caps on
>>>> the input and output.I once used a Maxim part rated DC to 10 GHz, that
>>>> absolutely screwedup below 100 MHz.A lot of "DC" parts are actually
>>>> characterized down to 9 KHz, becauselots of spectrum analyzers only go
>>>> that low.Grrrrr.
>>>
>>> O yes,  they are different. No one would really understand,  until
>>> you work with one.
>>>
>>> Cheers
>>
>> I found one Pericom RF switch that is "True DC to 8 GHz", which may be
>> an improvement.
>>
>> So DC means AC, but "True DC" means DC in the RF world.
> 
> ISTR being told here that 40Mhz was "practically DC" (but I suppose today
> it probably is!)

I thought it might be 100MHz. After all, the wavelength is almost 10 
feet long!