On 14/06/18 23:31, gandalfg8--- via time-nuts wrote: > Earlier replies that discussed removing the DC supply from the 8140 outputs > gave me the impression your requirement was to connect directly the outputs > of the 8140 without line tap modules, which is what I was addressing with my > recent suggestion of a series capacitor, but can see now that's not the case.
I think that was a digression from my post, I'm planning to use the 8140 as-expected by Spectracom. > The VersaTaps phase lock an internal crystal, any frequency between 4 and > 20MHz, to the 10MHz input and then provide an output at the crystal frequency > or the crystal frequency divided by a fixed integer between 1 and 8,192, so > in that sense yes they're a synthesiser but the few I've seen were still > supplied preset for a specific frequency. Ah, yes, that design would make a lot of sense. I was imagining a more modern design you might do these days. > However, "versatile" does not necessarilly mean quick or convenient to > reprogram. > Aside from perhaps needing to change the crystal the division ratio needs to > be set by adding or removing links across pairs of holes in the circuit > board. Those holes are on a standard 0.1inch pitch so fitting headers that > would take shorting links should be straightfoward enough, and I suspect what > was originally intended, but the units I have were supplied preprogrammed > using resistor style wire ended zero ohm links mounted above the circuit > board and soldered from below. Reprogramming one of these would involve > unsoldering and perhaps removing all the connectors etc in order to remove > the circuit board, so I'd certainly make darn sure they had headers fitted > before being returned to the box! I'm going to have to do something very similar to the 8140 when it arrives, as I bought one set for 1MHz input, and I'm going to (initially) be feeding it 5MHz from an FRK. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
