Review on 💡 TekPower TP30SWII: Efficient 30 Amp DC 13.8V Analog Switching Power Supply with Noise Offset by Ryan Person

I bought this to use with my Yaesu FT-2900R and it works great. No switching noise when transmitting or receiving in the 2m band. Noise Offset works well when you need it. To test, I turned on an AM radio tuned to 820kHz and placed it near a power source. The switching noise was about 1000 cycles per second with the noise offset turned fully counterclockwise. Turning the Offset knob clockwise about 20 degrees eliminated the noise completely. Voltage regulation is pretty good, but you won't be able to tell from the built-in meter. I hooked up a Fluke 8050A to the rear terminals and got a reading of 13.823 VDC while my unit was receiving. The 30W transmission drew 8.0 amps and the output voltage dropped to 13.662 VDC. I think the 0.161 VDC drop is pretty good going from almost zero to eight amps [see update fig]. The built-in counter pointer did not move at all. I don't know if this is because the voltage drop is too low to show, or as one reviewer suggests, the meter is measuring the voltage the device is set to, rather than what the device is actually outputting. During my testing, the PSU stayed cold and the fan never turned on. I had my doubts that a switching power supply would be as stable as a linear one, but this one seems just as quiet when the signal-to-noise ratio is adjusted for RF use. The size is about 1/4 of my 30A in-line power supply, and the weight is maybe 1/10 (my in-line power supply is homemade with a forklift charger). UPDATE: After the PSU has "blown out" or maybe just warmed up, after eight hours of use, the voltage regulation is better than stated above. The above report just finished with an "on" time of about 30 minutes. The 30W load difference between radio on and 30W transmit power is now 0.077 VDC. The 75W load difference between the radio on and the 75W transmit power is now 0.119VDC Fluke 8050A used for the measurements Using a precision ammeter in series with the power supply, the current readings are as follows: - Low 1 (5W power) 4.0A - low 2 (10W power) 5.2A - low 3 (30W power) 7.6A - high (75W power) 11.4A All these measurements were made using an antenna with a SWR of less than 1.1 carried in the vicinity 100 feet away from the transmitter. The ammeter on the power supply itself was close (within 3/4 amps) to an accurate meter.