Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx> Hi, At 11:25 AM 12/21/2005, you wrote:
Hello Terry, >The antenna's ground plane is grounded through the cable to >the scope chassis I understand this, but - if the scope is grounded directly?
You can ground the scope anyway you want. There should not be a high potential difference between the scope's ground and the coil's secondary ground. Voltage appearing there could foul the readings if it were too high.
And - you wrote:"If smaller input impedances are available, the frequency response can be extended further"Pretend a situation - we take, say, an 1M input scope, put the T-connector to its input, 50-ohm terminator and antena to the free side. We`ll lost some sensibility, but I wonder - how much timeswould the bandwidth increase? 1000000/50=20000 times?
Yes! If you terminate into 50 ohms, the lower frequency will be devastated. Instead of going to less than say 100Hz you might have a lower cutoff of 2MHz at 50 ohms. It is just a small capacitor and you are loading it heavily, so only very high frequencies will get through.
Cheers,
Terry
.........> Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx> > Hi, > The files you mention are up to date. The antenna will work with any > scope. The antenna's ground plane is grounded through the cable to > the scope chassis. > Cheers, > Terry