开云体育

Most likely Chinese Gov't is filtering a lot of info passing through the 'Great Firewall of China' due to COVID19 concerns and this is 'collateral damage'.

Larry, The seller in Shenzhen is able to see it listed but I can't view it here in India. -- Salil Tembe (Nuclearrambo.com)

Did you actually find it listed on Taobao or are you attempting to buy through a seller that sold the older versions?

I reviewed the first version. I can test this one too. I'm trying to get it through my component dealer in Shenzhen. He is trying to get two for me. Unfortunately, the taobao seller isnt responding to

same here? cannot find it anywhere

I'm not a tech leader by any stretch but I do have a variety of radar antennas and waveguides for various freqs up to the device's 4.4GHz range that I'll use to test this on. So far, I haven't found

Who is our group tech leader who is going to test it and give a report? 73 Glen K4KV

@Bob, Exactly. Be aware that the curves in the muRata datasheet does only show pass band vs real load. Imaginary loads like parasitic capacitance will also impact.

Chris - I didn't pay for DHL shipping. Apologies for being unclear. vy 73, Russ

Russ, how does one (say, somebody like me!) get the option of not paying for one to get one?? ;-) -- Regards, Chris

David Platt, First the input has a L-network coil plus input C of the Jfet. So the input impedance is likely under 2000 ohms maybe 75 ohms. The gray areas on the drawing modules are triple tuned band

Here's a few graphics from the Murata Ceramic filter manual. The first one shows the change in response, both amplitude and group delay, versus impedance load. The next one is Murata's suggested

Right. Small comment: Be careful on layout around the in/out pins on the filter. I can see on your picture you might have quite some capacitance from in/out pins to ground. Normally ground is keept

Dave, Some folks are getting all worked up over the small stuff. Reminds me of what I was taught in the Air Force:? measure with a micrometer, mark with a grease pencil, cut with a chain saw. I

In that respect, after working decades above 50 MHz, 630 and 2200 meters is a relief. Clip leads are not even seen by the RF energy. Dave - W?LEV -- *Dave - W?LEV* *Just Let Darwin Work* *Just

I solved the problem like this.

Aha! Great - I had wondered at the time I read it about the power capacity of the N type. Since I don't have any, though, I wasn't motivated to research it. Glad to know the truth now - thanks. I know

As you say, fiddling with something this complex is unwise; it's said they had to invent a stereo sig-gen good enough to get the lowest distortion and highest stereo separation it could achieve over

Hi John, This matter has already been discussed by those skilled in the art of calibration. What's important is that you can use it in short waves, but you said both 2M and 70cm. Therefore, I would

Newbie question. I run 2 x 10cm sma pigtails from my nano, onto an external frame. They connect to a back to back SMA <> N Socket. My reason for this is I will use the nanovna-f outdoors a lot,