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Hey Stephen, Why don't you read up on the basics, indicated and described by several on this Group in this thread. Pointers like general TDR principles, ideas and setups, Alan Wolke (W2AEW)'s videos

Hi all, Just wanted to remind everyone that the chat server is alive and kicking. You can join via this invitation link: https://discord.gg/7SdPZ5us After you join you don't need an invitation link.

is the cell 3.6v?

I don’t yet know how to interpret these, but I made 4 more pictures that vaguely resemble the ones Miguel uploaded earlier. Cable is a 6” 50Ω load and SMA to BNC adaptors. Nothing fancy. Experts,

Hi have tried the cable that comes with the nanovna p4 and I only see a little difference of few picoseconds, 4ps In the photos you can see de difference between a cheap and a microcircuits 50R SMA

I opened up the 7623. As suspected, there are no WIMA caps in there. I did, however, found the problem. Years ago, I installed the push button illumination mod. The 2 wires coming from the LM309K

I understand Peter. I’ll try to have some more available when I have more time. Right now I’m fixing my 7623. Thanks again.

Subject says it all ,,,thanks for all the replies

I misread you posting. You are in the USA? If yes, I’ll take it for shipping.

Pity! I have a spare attenuator assembly but I live in the USA. With international shipping, the two are destined for separate lives!

I placed a pic in the photos 465 issues album of my resistance and voltage reading. I used a fluke 8842A and got much better readings.

I have a 7A29 plug-in (parts or possibly repair?). It is not working has a balky V/Div switch. When I opened it up for a visual inspection 3 small plastic pieces fell out (one is clearly a broken

OK, if your test point voltages and ripple are "spot on", why are you measuring resistance to ground at the test points? This test is only useful when one or more supplies is out of specification or

It must be tricking my meter I’m going to test again as I’m seeing the correct voltages?

Definitely should not be reading open. There might have been some charge in the caps that fooled your meter. They should read as a low resistance that increases. The recommended. but rarely followed,

Well after checking every tantalum cap for a short I decided to poke the Low Voltage TP’s. Checking for shorts to ground from TP’s -8vdc, 5vdc and 15vdc I see resistance but no short. Then I test

Dave, More toys always sounds good to me (until I have to find somewhere to put them). I've been wondering if a dual beam scope should be added to my wish-list. I'll be interested to hear what your

Not really. The scope isn't the only thing with limited bandwidth. But I did pick up an interesting scope I'd found at a local surplus store this past spring. It's from an eBay seller I've bought from

One of the firsts things that you can check is the big difference beetween cheap and expensive 50 ohms load resistors, then you can measure if they are inductive or capacitive at high frequencies.

Dave, Have you made any progress on this? It’s bugging me. I saw suggestion (in another group) that oxidized contacts could add capacitance to a circuit. I’m not sure that there are any candidates