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

Bob kb8tq kb8tq at n1k.org
Mon Jun 4 12:36:03 EDT 2018


Hi

Without the taps, the Spectracom system really does not do much for you at all. There is no 
isolation / no buffering / no nice multiple output frequency stuff. Much cheaper and easier to 
just use a simple 10 MHz amp if that is all you want to do. 

Since you have significant voltage on the line, just dropping a 50 ohm load on there is a bad idea ….

Bob

> On Jun 4, 2018, at 11:24 AM, Arthur Dent <golgarfrincham at gmail.com> wrote:
> 
> If you're not going to use the Spectracom  taps that are the
> reason for the D.C. being on the coax, you can easily remove
> the inductors used to superimpose the D.C. on the coax lines.
> Without the 12V.D.C. on the outputs you can use standard 50
> ohm terminations. The open toroids are reachable if you take
> out a few screws to tip the back panel out and clip the leads
> to remove the parts.Using the 8140 as a DA without disabling
> the 12V.D.C. is a good way to fry some piece of test gear.
> Here is a photo of the schematic.
> 
> -Arthur
> <8140 output.jpg>_______________________________________________
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