Becen 25W type N dummy load

 

I purchased an inexpensive 50Ω dummy load rated at 25W from Becen on Aliexpress (~$20 inc shipping), the intended application is HF.

Above, the dummy load.

Above, the centre pin passes a gauge test, doesn’t satisfy the Precision N criteria, but well within tolerance of non-precision N connectors.

RF performance

Above, the VSWR plot from 1 to 101MHz.

Above, the ReturnLoss plot from 1 to 101MHz. ReturnLoss is a better metric for low VSWR loads. ReturnLoss is better than 30dB from 1 to 101MHz.

RF performance is very good, especially for an inexpensive load.

Thermal performance

Above is a thermograph of the load dissipating 12W for 10m, temperature rise is 55°. This is really the limit of continuous power rating, and even then, at 20° ambient, the heatsink is hot enough to burn skin.

Like most power rating claims, they are a lie.

Nevertheless it is a good 10W continuous rated load.