Try setting the width a bit lower. You have not allowed anytime for the transitions and it may be confusing the unit.
Not sure what you mean ? 10MHz, 100ns period, pulse 50ns wide so 50% duty cycle, 50ns "off" time... isn't that plenty enough to "recover" ?!
Unit can do 50MHz to boot, so a period down to 20ns. So at 100ns I am really not pushing it
![Embarrassed :-[](https://www.eevblog.com/forum/Smileys/default/embarrassed.gif)
Anyway, just tried it. 20% duty cycle this time, so 20ns pulse and 80ns off.
Result is exactly the same, no better or worse, status quo.
But it was my first good excuse to use my shiny new coax cables and adapters !
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)
Boy it's so nice to have all the cables and adapters you need at your disposal, in a just few seconds everything is connected up properly like a pro, no more scope probes banana adapters and bits of wires hanging ! I am a pro now !
![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)
However I have a new problem now... looks like my Metrix Nixie counter has a problem with its LF / 1Meg input ! Signal is only 10MHz so it can take it no problem. However it would not register / count anything at all, only zeros on the Nixies, even though I have good signal amplitude, 5Vpp unloaded, and no matter how I fiddled with the input "sensitivty" pot/control. Plus, when I connect the counter, I can see on the scope that the signal goes haywire. Big drop in amplitude + it becomes completely out of shape, looking like a wiggly triangle, no more a rectangular pulse at all ! If I use the HF / 50R input instead, all is well.
So, the LF front-end has a problem.... some more repairs in the queue !
![Roll Eyes ::)](https://www.eevblog.com/forum/Smileys/default/rolleyes.gif)
This counter is not easy to work on I fear, very compact in there. It's not going to be fun I think...
![Angry >:(](https://www.eevblog.com/forum/Smileys/default/angry.gif)