[time-nuts] Re: Data collection cycle -- multiple sources to one
counter?
Poul-Henning Kamp
phk at phk.freebsd.dk
Tue Jun 21 17:16:38 EDT 2005
In message <42B83636.4050809 at usa.net>, Alberto di Bene writes:
>Brooke Clarke wrote:
>
>> A PIN diode is great for switching RF frequencies above the diode's
>lifetime. But not so good at switching DC coupled signals.
>> The FET type switches, like the MAX458 are designed for switching DC
>coupled signals.
>
>Does anybody know what the HP 59307A uses ? It can switch from DC to 500
>MHz and the measured DC resistance is on the order of 0.2 ohm. Looking
>into the unit reveals that the switching device is shaped like a fat IC,
>thermally coupled with the back panel.
Mostly it uses reed-relays I think.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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