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You inject the test signal into the output of the RF Amp and connect the RF Amp Input port tothe test set detector. On network analyzers not providing automatic switching of input and outputs,one

I would disagree with Tom regarding " Properly functioning cables and connectors" not being non-linear. There is always some non-linearity, it just depends on the level. Even the slightest amount of

I think with problematic interfaces on cables, the non linear effects will probably be on the order of 90 db or more down. Whether this will even be measurable will certainly depend on your noise

If an amplifier isn’t prone to oscillation (with high power) that might damage a vector network analyzer measuring S21 is a direct measurement of isolation.

I agree with Jeff. Properly functioning cables and connectors are not nonlinear and thus cannot produce the effects that Lankford reports (assuming that he has achieved a proper match to eliminate the

I think that the coax cables, and connectors, should be investigated in isolation, Non-linearities in cables and connectors are a well-known phenomenon. 73 Jeff G8HUL

Matt, Thanks, I’ll do that test. ?Phase noise is something I have dealt with. ?We bought the Phase Noise Analyzer that went in the F-16 radar test set from Linksys(old CMI). One of my projects was

Oh and if you want a much better explanation of what this amplifier is all about than I can give you, you might ask on the time-nuts mailing list. The amplifier designer (Bruce Griffiths) along with a

Hi Steve, Yep that’s right. If you want a sweep across frequencies typically a VNA or spectrum analyzer would be used. But for a single frequency (which is often all you need for a frequency

Jeff/Matt, how would you instrument the measurement for reverse isolation? ?Perhaps an sig gen feeding the “output” and then look at the “input” on a SA? ?I ask because I’d like to measure

Hi Jeff, Can you clarify a bit more what part confuses you? Bruce designed this amplifier to buffer (and slightly amplify) low phase noise frequency references and the goals for it are low

Yes, it's working.

My biggest design concern is making the path between the external trigger input in HW or via the SW. If the uncertainty in the time between an external trigger and the actual opening of the gate can

I'm using a very similar feature on a Racal 1999 Frequency Meter right now. I'm checking the drift of some of those Chinese OXCO boards that came up in a different group (HP) . I'm using a 20 second

Now the base functionality of my DIY counter/timer is working I'm puzzled about adding an external trigger input. Never used such an input. I known from user manuals it is supposed to trigger the

The group is still working, but it seems nobody has written anything since mid-April. Dr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... https://www.kirkbymicrowave.co.uk/

Question is the in the subject line. I guess if I see my post, I'll know no one has any thing to discus lately! Mikek

That was a project on eevblog. Pretty interesting too. I was tempted to make it since it adds some nice features, but I ended up falling into a lot of MX500s so I have spares in case one goes out.

Which Metcal power supply did you use?? Not sure how old mine are, but that's a problem I haven't had. Somewhere there's an article on making an RF30? clone with schematic. Harvey

I purchased a used Metcal (older model prior to 500MX) and a cable and iron/tip separately. They mated to the base okay, but where the base indicated power up and a green indicator initially on the