[time-nuts] spectracom line taps
James R. Gorr
n3toy at yahoo.com
Tue Feb 19 19:01:04 UTC 2008
OK, well it looks like the taps are needed for the
proper operation of this device. I will just get a
TADD1. Thanks for the input.
--- Bill Janssen <billj at ieee.org> wrote:
> John Ackermann N8UR wrote:
> > jshank said the following on 02/18/2008 03:05 PM:
> >
> >> Jamie,
> >>
> >> If you have the Spectracom 8140 you need to use
> the line taps. With out
> >> using the line taps you sinewave will not be
> symmetrically along 0 voltage,
> >> that is the sine wave will all be positive
> voltage.
> >>
> >
> > I'm not certain about that; while I haven't used
> an 8140 amplifier, I
> > have an 8164 WWVB disciplined oscillator that has
> an option installed to
> > allow it to run a string of 8140T taps. I was
> able to use those outputs
> > directly by using a series cap to isolate the DC
> voltage; what's left is
> > the 10 MHz sine wave. As I noted in my other
> post, it does want to see
> > a 50 ohm load (after the isolating cap) or the
> fault indicator may go
> > on. I suspect the 8140 amp is very similar;
> Spectracom did a lot of
> > design reuse across their products.
> >
> > John
> Be careful with that termination. If the output has
> 12 volts DC you
> would need an isolating cap.
> The Line Taps were intended for a production line
> where the taps could
> just be plugged in
> and would get their power from the coax. Some were
> made that had a power
> jack and those
> could be powered from a "wall transformer".
>
> Bill K7NOM
>
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