Wordclock signal spike
Posted: Tue Feb 22, 2022 9:33 pm
Hi All,
I use the wordclock signal from the HDR to clock my D8B as I've always been told that using the D8B's internal clock for the HDR was not a stable set up. My D8B has always gone ballistic (meters full on, that kind of thing) if I mistakenly boot the HDR first, so the D8B gets booted first and then when I boot the HDR and the clock signal kicks in, there was always this big spike on the meters for a second. I got to thinking that this spike could be the reason why my D8B session files sometimes get corrupted (a voltage spike is never a good thing) so I bought a 75 ohm bnc A-B switch and installed it between the D8B and the HDR with "A" making the connection and "B" connected to nothing. Now I can boot both units up at the same time with the switch off and after the HDR is fully booted (I think this spike is generated when the HDR first starts up its clock) I turn on the switch and only a very small jump on the meters. Also before if I needed to change out the external drive on the HDR, I would have to power off the D8B and then the HDR, change cassettes and reboot first D8B and then HDR. (if I shut off the HDR without shutting down the D8B the D8B would always go meters full on). Now I just turn off the clock switch leaving the D8B on and only have to power down the HDR, a great time saver for me. I don't know if anyone else has experienced these issues, but thought I would pass this along. You can get a 75ohm BNC switch from Markertek for about $15.
Have a blessed day,
Mike
I use the wordclock signal from the HDR to clock my D8B as I've always been told that using the D8B's internal clock for the HDR was not a stable set up. My D8B has always gone ballistic (meters full on, that kind of thing) if I mistakenly boot the HDR first, so the D8B gets booted first and then when I boot the HDR and the clock signal kicks in, there was always this big spike on the meters for a second. I got to thinking that this spike could be the reason why my D8B session files sometimes get corrupted (a voltage spike is never a good thing) so I bought a 75 ohm bnc A-B switch and installed it between the D8B and the HDR with "A" making the connection and "B" connected to nothing. Now I can boot both units up at the same time with the switch off and after the HDR is fully booted (I think this spike is generated when the HDR first starts up its clock) I turn on the switch and only a very small jump on the meters. Also before if I needed to change out the external drive on the HDR, I would have to power off the D8B and then the HDR, change cassettes and reboot first D8B and then HDR. (if I shut off the HDR without shutting down the D8B the D8B would always go meters full on). Now I just turn off the clock switch leaving the D8B on and only have to power down the HDR, a great time saver for me. I don't know if anyone else has experienced these issues, but thought I would pass this along. You can get a 75ohm BNC switch from Markertek for about $15.
Have a blessed day,
Mike