[time-nuts] Introduction, new list member, Ms Tisha Hayes, AA4HA

John Ackermann N8UR jra at febo.com
Thu Mar 29 08:21:32 EDT 2018


The impedance mismatch with the A or B models is't a real issue unless you're doing precise amplitude measurements.  Lots of folks use them for FMT work without issues. There are adapters available or buildable to deal with the odd Telco connectors.

John

On Mar 29, 2018, 3:04 AM, at 3:04 AM, Ruslan Nabioullin <rnabioullin at gmail.com> wrote:
>On Wed, Mar 28, 2018 at 9:49 PM, Tisha Hayes <tisha.hayes at gmail.com>
>wrote:
>
>> Perry and I would make our pilgrimages to the Huntsville Ham Fest and
>> usually I ended up buying equipment from him. One of the items he
>sent my
>> way was an HP 3586B that I am finally beginning to put to use.
>>
>
>Hmm that measuring receiver model (diffs can be found in:
>http://www.militaryradio.com/manuals/HP/hp3586-a-b-c.pdf ) was
>apparently
>intended for testing and troubleshooting purposes for those ancient
>FDM-based POTS trunk systems, not as a general-purpose HF measuring
>receiver (the HP 3586C)---I'm not sure how well they would function as
>HF
>receivers for WWV and CHU following impedance adaptation (b/c it
>doesn't
>have a 50 ohm unbalanced interface).
>
>In my case, I supply my time transfer volunteers with the following
>setup:
>
>vertical antenna -> TVSS -> preamplifier -> military rackmount
>preselector
>-> military/intelligence rackmount parametric demodulator or HP 3586C
>->
>Xeon NTP server via soundcard
>
>with GNU/Linux daemon software which commands the preselector and
>demodulator via GPIB.
>
>Still, WWV/CHU-derived public NTP nodes are virtually nonexistent, and
>therefore there's a strong need for them, regardless of the
>sophistication
>of the receiver, due to the pitfalls of GNSS.
>
>-Ruslan
>
>-- 
>Ruslan Nabioullin
>Wittgenstein Laboratories
>rnabioullin at gmail.com
>(508) 523-8535
>50 Louise Dr.
>Hollis, NH 03049
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