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I hope so.? ;-) In this setup (Q12 / CR13 out of circuit), the gates of Q15 are offset just a bit - A: -5.0V B: -5.8V? The drains are of course then far apart - A: 2.8V B: 8.46V? and the sources

The problem is obviously revolving around the op-amp which is made up of Q15 and U2. The two gates of Q15 should be balanced at all times, otherwise the output of U2 would be stuck at the +12 or the

Pat, Thanks. I was pretty sure David had the A/B designations swapped, but confirmation greatly appreciated. And it would be very easy for someone reading the thread later to get things backwards with

Might take a few hours to be approved and propagate. [email protected]> wrote:

*[email protected] <[email protected]> *has been created. Have fun! [email protected]> wrote:

With the protection circuitry disabled, the 1K resistor reads 1.87K. U3's inputs are both at -6.4V.? Its output is at -7.4V. Q15 seems to depend on what I'm measuring; for this test, its inputs are

Looking for person (one or more) interested in starting and running a Wiltron/Anritsu equipment group (possibly modeled after this HP-Agilent-Keysight-equipment group) on groups.io. If you are

I bought mine from Globaltest a few years ago, I think I paid about $40 for it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Dave, In regard to the collet extractor for APC-7, where did you find one cheap? I've been looking high and low for an inexpensive collet extractor without success. -Eric

Hmmm... If solid, you could hold the material in air away from the electrodes Chris Trask N7ZWY / WDX3HLB Senior Member IEEE http://www.home.earthlink.net/~christrask/

Just going through my old emails. You may find the attached useful. Don't even think about getting into the bridge to change the impedance. HP uses stripline on a saphire substrate (on the 85046A

With all this great talk about VNA's it reminds me… I have an extra 8753ES, 50ohm, internal s-para, working and looking beautiful… 3ghz unit. $3k and also an n8357a 6ghz pna for sale… same

Hello Greg, I think we're getting close to the root cause... but I thhink I need some more data. First, temporarily unsolder the collector lead of Q12 and one lead of CR13, which will disable the

Yes, my error. I got the 85046A and 85046B transposed! The A is the 50 ohm version with APC7 connectors. I doubt the RF source, A, B or R receiver N connectors would get damaged as they are rarely

Hi Tom, At 4GHz, using my E4406 to measure its output from -90dBm to +13dBm, it appears to be within 0.5dBm of indicated. Above 13dBm the power doesn't increase and the UNLEVELED indicator comes on at

I see that the output of U3 is at -7.4V and the input is at -6.4V, so off from the specified value by 0.1 at each end.? The gate voltages of Q15 are finally balanced, which they weren't before, but

Just to be certain things don't get crossed up, the 85046A is a 50 ohm, 300 kHz to 3 GHz test set, and uses APC 7 connectors to interface with the DUT.? The 85047A is similar, but goes up to 6 GHz.

That is similar to what I see at NPL. Keysight and an aftermarket Swiss? company make a surface probe that can The coaxial probes can be made oneself, but I personally find the mathematics too hard to

[email protected] wrote: To my knowledge all *50 ohm* 3 GHz test sets (85046B) have APC7 connectors, not N connectors. If the test set has N connectors then it is almost certainly an 85046A which is

Thanks. I've got a lead on an 8753B with a 50 ohm 3 GHz S parameter test set at a comfortable price. Gedas gave me a very succinct explanation of why an eternal test set is preferable from a hobbyist