开云体育

Hi, Jorge here (M0LDW...also LW5DX) in Leeds. I found them in different variants in Amazon UK. I don't think there will be an issue with the stock. The way to search is looking for: "20mm Conduit 2

Dear UK ham, I am building my Wellbrook copy with the PCB from Everett. This PCB fits into the original enclosure: 20mm 2 Way Through Junction Box - White. Unfortunately it is out of production with

Francesco, that label means the maximum RF and DC input both ports can take before damage--it has nothing to do with the actual S21 output level--you have to measure it as I showed in a recent post

Goodmorning, An answer to your appreciated questions... Ratzlaff - I posted a picture of the edge of my NanoVNA on S11 port, it says "+10 dBM - 10 VDC Max". I think the signal processing levels are

I agree that oscillation is possible, but it should be noted that the amplifier is push-pull, and the 1T coil driving the transistor needs to be in opposite phases. You can view the schematic diagram

I have had an Optivisor and loupe for the past several years.. it has worked well! But.. now the lens in the front pops out now an again and the visor has black push buttons to hold it in.. if you

I used a stereo microscope at work daily for the last 10 years of my electronics career. The B&L were most common, but I used my personal Zeiss scope. The B&L scopes were used with fiber optic halogen

I have two handheld VNAs--a Seesii NanoVNA-H (3 inch screen) and a Zeenko LiteVNA 64 (4 inch screen). Using a SA with VNA set to Start 1 MHz and Stop 1 MHz, the VNA-H S11 output was about -10 dBm; the

What I mean is that the input coupling capacitor may not be the value it's marked with.? In 40 years of repairing electronic equipment I've run into many cases of mismarked, or maybe just floor

The saturated output power of meany of the decent loop amplifiers is >+20dBm, which can easily damage a Spectrum Analyser input. I was always taught to put an external 20dB attenuator on the input to

Whenever I check presmps for whatever purpose, I always assure the input level to the presmp is around -45 dBm. I use the Rigol SA equipmed with the tracking generator. The generator is set to -20

Yes, Tom is correct-- it's entirely possible a second attenuator is needed on the VNA's receiver S21 port to prevent overloading the VNA. The specs of the VNA should state the max S21 input. The

I don't have a microscope, but it would be very useful to have. I have various magnifiers I use on occasion, but a microscope would be much

I use a cheap Chinese copy using plastic lenses, that originally cost around ?8 GBP. It has a second drop down lens behind the first, to further increase the magnification, plus a single swivel

Francesco, I want to say I might be wrong here so, please double check me. In your drawing you show the 20db attn connected to the input of the amp I assume this is to prevent over driving your amp.

Good morning, sorry if I didn't answer all the appreciated replies but yesterday I sat there to do some tests and I have to say that maybe the apparent poor sensitivity on the low ranges of the LN

Not affiliated with them but have used them ever since I was trying to solder and wondered why I couldn't focus close enough. As you age you inevitably run into the issue. The OptiVISOR is one

Coupling capacitor value too small?

I wonder if you might be using BN43-302 instead of BN73-302 material for the cores? A transformer wound on 43 material will have nearly 1/6 the inductance of the same transformer wound on type 73

Hi Francesco, Have you used a nanovna to sweep the gain and input impedance? You'll need a 1:1 input transformer (unbalanced to balanced). You'll also need an attenuator on? the nanovna TX output to