Subject says most of what I want.

But a second question: ?Let's say you have a powerful source - high voltage. ?How do you reduce that power so as to read the spectrum and not fry the TinySA?

Thank you, ? ? ? ? larry

On Wed, Jan 6, 2021 at 06:47 AM, Lawrance A. Schneider wrote:

Subject says most of what I want.

But a second question: ?Let's say you have a powerful source - high voltage. ?How do you reduce that power so as to read the spectrum and not fry the TinySA?

Larry,
? ?You didn't say what type of high voltage source you are considering.? If the source is the output of a high power amplifier then a directional coupler works well.? If the source is really high voltage rf, then a high voltage probe designed for spectrum analyzers (50 ohm output) would be my choice.? Both solutions will cost you more than the tinySA unless you can score a deal on a eBay or similar site.

? ?A non-contact E-Field probe can also be used to monitor high voltage RF sources but the measurement is only relative. The E-Field probe is probably the cheapest solution other than a 40-50dB direct voltage tap as presented in an earlier thread.

? - Herb

There are a lot of good attenuators available on ebay, Banggood, etc.? You will have to consider your needs and decide what suits you best.? I have a good assortment of 2 watt SMA attenuators, ranging from 1 dB to 30 or maybe 40 dB.? Like this:



I also have a 20 watt attenuator and a 50 watt attenuator of this style:



The round coaxial attenuators often have one end intended to be the high power input.? If you run high power into the other end, you'll burn it up.? I seen some of the cheap Chinese units marked as to which end is rated for high power, but I have also seen some that aren't marked.

In addition, I have a toggle switch attenuator similar to this:



I will probably soon buy one of this type:



Those have their flaws, like as much as 2 dB attenuation when set for 0 dB, and limited power handling capability, but for a lot of stuff, they are very convenient.? I will probably soon buy a 100 watt unit like this:



And possibly eventually maybe a 500 watt or 1000 watt unit.

?

If you just need to see if there's anything there and don't need great precision, make a? one or two turn "sniffer" loop with hookup wire and solder it to an appropriate connector.

I bought these, but would not run any HV through them though.? I agree, use a field coil or something that isolates like the probe.

It all really depends on where you are located, a good source for people in the US may not be as good in Canada or Europe and the rest of the world? and the other way around.

On Thu, Jan 7, 2021 at 07:13 AM, Phil Royce wrote:

I bought these, but would not run any HV through them though.? I agree, use a field coil or something that isolates like the probe.

I have some of those, too, identical down to the lettering on them.? I checked them by several different methods.? They are fine.

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On Thu, Jan 7, 2021 at 07:13 AM, Phil Royce wrote:

I bought these, but would not run any HV through them though.? I agree, use a field coil or something that isolates like the probe.

I have some of those, too, identical down to the lettering on them.? I checked them by several different methods.? They are fine.

_._,_._,_

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A little OT.? I have an 82 dB step attenuator and a fixed 20.? I got one of the WB-SG1 generators.? If I throw in all the attenuators , 102 dB,? I still get a -53 dB spike.? Must be bleed through somewhere, no way can that generator be that hot.

Eric WA3UYI