[time-nuts] Re: Data collection cycle -- multiple sources to one counter?

Poul-Henning Kamp phk at phk.freebsd.dk
Tue Jun 21 21:16:38 UTC 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
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Never attribute to malice what can adequately be explained by incompetence.




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