HP 8640B - Need Help!

I assume you checked with HP,and that they want a fortune for it.... If you have a good idea as to exactly what each pin is for, as well as the function, input and output specs, maybe you can make a small breadboard replacement?

Not exactly. I went through some refurbished test equipment dealers that I know of. Never thought of HP in the first istance because of their "10-years support and then you are on your own" policy. But it might be worth a try, in fact. Actually, I'm not making a big problem out of spending a fortune of it, as it's an expense which is going into the insurance claim anyway.

Nope. Not for a ultra-linear amplifier from 450 KHz to 550 MHz. I doubt I could ever reproduce the gain, linearity and noise figure that HP was able to put in. Unless I want to part with the excellent performances of this generator, which is something I don't even consider.

SeeYa!

/\ /--\ndrea

The 8640B is one of the lowest noise signal generators ever made. I rather suspect that's what Robert had in mind when he got it.

If you're going to use it for testing links, it matters.

Sorry 'bout that. I just looked back up the headers for the name, and the OP had scrolled up out of sight.

Must get new glasses.

I promise it won't happen again, honest :-)

There are a *lot* of op-amps that have bandwidths that exceed 550Mhz, so with feedback or gain strapping options - depending on design, one would be able to have an amp 0-550MHz with (i think) reasonably comparable noise figure. Then one would have to add a bandpass filter - say a passive one in the input.

Well, check out this ebay auction anyway

Try Fair Radio Sales at snipped-for-privacy@wcoil.com that's where I got mine. Phil J