[time-nuts] A small piece on HP's hydrogen maser in 1968

Richard (Rick) Karlquist richard at karlquist.com
Wed Feb 26 00:53:08 EST 2014


Solid dielectric cable and connectors of 3.5 mm size
are mode limited to 18 GHz.  That is why there is
so much stuff rated at 18 GHz as opposed to 16 or
20 GHz.  The next jump up is 26.5 GHz where 3.5
mm size works in air dielectric.  It costs more
to make these components and the volume is lower,
hence the higher price.  Also, the low price
vendors may just stop at 18 GHz.

Rick

On 2/25/2014 9:03 PM, Bob Bownes wrote:
> Lot's of connectors change specification @ 18Ghz or are not rated bast
> 18Ghz.
>
>
>
>
> On Tue, Feb 25, 2014 at 11:55 PM, Hal Murray <hmurray at megapathdsl.net>wrote:
>
>>
>> jimlux at earthlink.net said:
>>> there's a BIG jump in  cost when you cross that 18GHz boundary line.
>>
>> What's magic about 18 GHz?  Why not 16 or 20?
>>
>>
>> --
>> These are my opinions.  I hate spam.
>>
>>
>>
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