Well it’s time for a new DMM. After the last pair of eBay El-Cheapo Chinese meters just didn’t last very well, I decided a proper meter was required. This one is a Tenma 72-10405, stocked by Farnell for under £60. Not quite as many festures as the cheapo Chinese meters,
I recently came across these on eBay, so I thought I’d grab one to see how they function, with all the metrics they display, there’s potential here for them to be very useful indeed. One of the best parts is that no wiring is required between the sensor board &
Unfortunately the manual for the eBay GY561 Frequency & RF Power Meter is very badly translated, but I think I have figured out the calibration procedure, so here it goes 🙂 On removing the front cover, which is just clipped on, there are 4 buttons. The only button that is
Now the final bits have arrived for the SWR Meter module, I can do the final assembly. Here the SMA connectors are installed on the side of the eBay meter, for forward & reverse power tap. These are simply tee’d off the wiring inside the meter where it connects to
Continue readingArduino SWR Power Meter Final Parts & Calibration
The latest addition to my radio shack is the GY561 frequency & power meter, which has already come in useful for measuring the output power of all my radios. It’s a small device, roughly the same size & weight as a stock UV-5R. Power is provided by 3 AAA cells.
Following on from the earlier power tests on my Baofeng HTs, here’s the readings from the Wouxun KG-UV950P. Power is a little lower than specified, but this is probably due to the supply voltage being a bit less than 13.8v. These readings were taken at a supply voltage of 12.88v.
I’ve noticed that the RF power output from the Chinese radios can be quite variable from model to model, and even from individual radios of the same model & batch. I’ve bought an RF Power meter (GY561) to do some tests on the HTs I have at present. All tests
As I’m building up my radio shack, I figured an SWR meter would be a handy addition to my arsenal. This is a cheap Moonraker brand meter, which also will measure RF power. Above the front of the meter is shown, with the moving coil meter movement on the left,
This is the Current Cost CC128 Real Time Power Meter. Shown here is the display unit, British Gas issued these free to some customers. This unit measures current power draw in Watts, cost of power currently being used (requires unit price to be set), overall kWh usage over the past