XRDS -RF SMA Male to SMA Female Coaxial RF Attenuator, DC to 8 GHz, 50Ohm, 2W, 30dB Constant Attenuator（2PCS）

These are better than I expected for the low price. I was able to measure them only up to 4.8 GHz, but it was done on a carefully calibrated professional grade network analyzer (and with the attenuators terminated with a precision 50 ohm load). From 1-4.8 GHz, two 3dB units had attenuation of 2.80 - 3.28dB and SWR of 1.08 or better. Two 30dB units had attenuation of 30.04 - 30.28dB and SWR of 1.08 or better. There's no claimed attenuation accuracy, but the attenuation was increasing with frequency. So the attenuation of the 3dB units might become unacceptable at frequencies much higher than 4.8GHz. However, they're fine for most applications, and easily meet their 1.2 SWR specification, at that frequency and below.

Perfect

Other reviewers are characterizing these attunators as out-of-spec, but they are not measuring properly. These are 50 ohm attentuators, meaning that when inserted into a 50 ohm feedline they will attenuate the signal but not change the characteristic impedance of the line.The images showing a 61 ohm impedance are measuring without a terminating resistor. And when I measured without a terminator, I also got 60.1 ohms (you should). However, when I applied the correct terminating resistor, I measured 49.3 ohms, which I consider to be appropriately close to the advertised 50 ohms.Both of my attunators were similar, and both provided 9.8dB of attenuation, which I consider appropriately close to 10dB.

I am extremely impressed with these. From 900 mhz to 6GHz they are well within 1 dB of nominal. Some are within 0.1dB. You should still characterize each one if you can.

I put these on my VNA to look at how flat they are. Looks like they're good to about 1.5GHz when the attenuation is about 3dB out from spec. And then it rolls off.. I can only measure to about 2.3GHz and worsens to that point.While I have no doubt you can shove 8GHz into one side, what comes out the other isn't going to be 20dB down.Still, looks like it should be fine under 1GHz, so this works for my application and is a good solution at this price. Just make sure you moderate your expectations..

Nice

Did the job isolating a problem in the lab. Good quality, fit, and simple.

As you can see, the attenuators provide pretty much 6dB of attenuation. There is a small bit of plus/minus, but for the most part, they are great. Although I haven’t tested them to 8Ghz they are good to nearly 2Ghz as far as I can tell, I’m very happy with them.