On Sun, 08 Jan 2006 01:07:20 +0100, Paul Burridge
k wrote:

On Sat, 07 Jan 2006 10:25:18 -0700, Wes Stewart
wrote:


Okay, I couldn't figure out what operational use it would have.

Actually, I've noticed that on checking up the mini circuits pointers
that the splitters they manufacture are only good for a given
frequency range. And I don't mean DC- Fx; I mean from say 30Mhz -
1000Mhz or similar. I'd have thought this type of stuff would have a
bottom end of *DC* not some relatively high radio frequency. We're
only talking about power splitters after all, not broadband filters.
So why the low frequency cut-off? Are there some capacitantances
utilized in these designs and if so, what are they doing there?

Without knowing which devices you're referring to, I would still guess
that they are based on broadband transformers. "Broadband" does not
mean DC to daylight. And yes, there might be some compensation caps
involved too.

If you want better bandwidth, including DC, and loss is not a concern,
then fully resistive dividers are what you want. An example of a
two-port is he

http://www.k6mhe.com/n7ws/HP-11549.pdf