[time-nuts] Source for DC-blocking 50-ohm terminators? (Spectracom 8140)

paul swed paulswedb at gmail.com
Mon Jun 4 18:56:39 EDT 2018


Julien
Thanks for the link I downloaded the manual and it all makes sense now.
Yes just lift the inductors to clear the DC. Its is actually for line
powered amplifiers as someone mentioned.
You would of thought there would be a power jumper per BNC.
Good luck.
Paul
wb8tsl

On Mon, Jun 4, 2018 at 1:50 PM, Taka Kamiya via time-nuts <
time-nuts at febo.com> wrote:

> I had the same issue looking for a DC blocking 50ohm terminator.  They
> simply do not exist.  So I just made one.  Took a BNC male connector with a
> chassis mount flange.  50ohm and 0.015 microfarad capacitor in series.
> (because that's what I had on my desk at the time)  The frequency is low
> enough, level is high enough, and some reflections are not going to cause
> any issues.  It has been working for me for quite some time.
> ---------------------------------------
> (Mr.) Taka Kamiya
> I'm stuck in a wormhole....  Hello, worms!
>
>     On ‎Monday‎, ‎June‎ ‎4‎, ‎2018‎ ‎12‎:‎10‎:‎15‎ ‎AM‎ ‎EDT, Julien
> Goodwin <time-nuts at studio442.com.au> wrote:
>
>  I'm looking at using a Spectracom 8140 for 10Mhz distribution, and they
> specify using a DC-blocking 50-ohm terminator on each run.
>
> These seem to be odd enough that none of my usual sources have them
> (75-ohm DC-blocking terminators yes, 50-ohm, no).
>
> While it's easy enough to chain a DC block and a terminator, I'd prefer
> a single module I can more obviously label as the line termination.
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