[time-nuts] spectracom line taps
Bill Janssen
billj at ieee.org
Mon Feb 18 22:08:09 EST 2008
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
More information about the time-nuts
mailing list