"J Shrum" ) writes:
Greetings,
As a newbie to RF building, I have noticed that some instructions tell you
how to wind the coil, and they give you the value of the coild as well...

In my scenario, the inductor in question is a .72uhy which the directions
state to use 17 turns of #30 around a toroid. I don't have the requested
toroid, so I was just going to wind a .72uhy inductor around a 1/2W 5M ohm
resistor.

This will just the same right? Whether its a .72 on a toroid, or a .72 on a
resistor... they are both the same, correct?

Well maybe not. They'd be the same inductance, but other factors come into
play.

What's the application? In various wideband applications, a core material
is specified to give it broadband response.

There might be a specific reason for using a toroid, because of it's
self-shielding qualities. If you're building in a small space, it may
be counting on that self-shielding.

Michael VE2BVW