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Yes, it's a good idea to have a UPS (or even more than one), for more than just this project.? ? ? ? ? ? Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone

Thanks Ed, I tried to adjust C524 but it is already at the end of the stroke because the frequency increases, but does not decrease. I will try to add a capacitor in parallel to C526 around 10 pF NP0

My set of boards arrived today in Dublin Ireland, Superb packing job by Larry, they are in perfect condition after the trip across the pond. The boards are indeed very high quality and I look forward

Michael I understand it means the channel input module needs to be disassambled, right ? Jose

Jose, It could be a dirty switch. My 485 had a lot of issues with those switches. It took forever to get both channels to function in all positions and combinations of these switches. Once it was all

Tom, Michael Yes : i dis not set the 50ohm input. I just tried to discover that Channel 2 is giving me the correct square wave in 50ohm input; but Channel 1 does not display the square wave. Something

Jose, Tom is correct. If you set the scope as he suggests, you should see a perfect square wave in the 50 Ohm mode. That curved top wave is normal for the 1M Ohm Input.@ 1 MHz calibrator setting. --

You don't show your setup, so it's hard to say, but I'm guessing it's something simple. Make sure that you are using coax. Make sure that you are in 50 ohm mode. Make sure that the BW limit is not

Hi Attilio, You're almost there. The 2095 MHz LO should be just fine - remember it's controlled by the crystal oscillator, as long as the PLL is working. So, it looks like you just need to lower the

Hi guys, I was checking my 485 against calibration 1kHz and 1MHz signals. - 1kHz is nicely displayed by the scope. - 1Mhz is not giving me a "perfect" square wave. I hooked up my cheap FY32124S

Try pushing in the 20MHz bandwidth limit switch. I prefer setting the focus and astigmatism controls with a sine wave displayed and the 20MHz bandwidth switch pushed in. -- Bob Haas

Thanks Raymond, I can’t dish out that kind of money for a UPS at the moment. Thanks for the tip and explanations anyway.

0.08Ω I did that on both scopes. The results on both are: From ground inside the scopes to: 1 - Ground cord terminal = 0.12 2 - Hot lead

Hello everybody Ed, I understood the matter of the finger on the oscillator at 52.500 MHz, putting the finger the oscillation frequency is lowered to 52.497 MHz and I can recover the track by acting

Hi Stephen, That's why I came up with a "UPS" (Uninterruptible Power Supply) in my previous message. The kind I had in mind is a self-contained shoebox-sized device, containing a battery and an

Raymond, I would gladly try this and do what Jouko suggested. However, I don’t have neither a car battery nor an inverter at my disposal at this time.... As a matter of fact, I don’t even own a

The beeswax transformers look like they are globbed with beeswax. The epoxy transformers either have a clear to slightly brown milky varnish over the wires and tape, or are molded in brown epoxy.

I'm not at all convinced that this is the way to proceed. Should you consider trying it, make sure that the output voltage and waveform are reasonably OK. Many affordable inverters are lacking in this

Back in the late '60's, Wavetek used the 2N3438 in place of zeners, Then Fairchild changed their process, and suddenly the breakdown voltage was raised about a volt. Suddenly, everything coming to

On Thu, Feb 25, 2021 at 12:38 AM, Jouko Koskinen wrote: Interleaved. > > Hi Stephen, > > That means getting a 12V car battery and inverter which generates 230V AC. > In that way you are disconnected