Not all builds are big and fancy. Sometimes you just have to build something to do the job. This 100w dummy load is 20 x 5w resistors in parallel, nothing fancy and should handle the 60w i wish to throw at it for a couple of amplifier projects i have sitting here.
The 30w dummy load i build previously, 10 x 3w resistors was starting to get warm around the 25w mark, so i think this new one should stay cool to 80 or 80w quite easily. I will add a 12v fan to the case if i need to cool it and give it more power at some stage.
Resistors soldered to the board in a grid 4×5.
Being 5% parts you expect some variation, but near enough to a 50 ohm load as you can get.
The RFPM1 RF Power Meter Kit by http://www.vk3aqzkits.com/ Let me preface this by saying, if this works 1/2 as good as the attention to detail that has gone into presenting this kit, it should be nothing short of awesome. Opening the box is a WOW moment, as the level of detail and care that has gone into making this kit is evident. Lou VK3AQZ takes customer service to a whole new level, where most kits manufacturers give you a box and a bazillion parts, as well as a few photocopied pages, the RFPM1 RF Power Meter Kit is immaculately presented.
Key to the whole device is the RF probe, small parts contained in pill boxes to keep the separate and so they don’t get lost in transit is a really nice touch. You will also notice solder in 2 different gauges, one for SMT work and one for thought holes. That is just unheard of from anyone.
The case is well routed and drilled, so there are no expectations for you to cut and drill anything.
Parts for the rest of the unit are all contained within the case, both the analog and digital meters have been checked before leaving.
Build notes for both parts of the kit are in full colour, printed on laser, the kit contains 2 dvd’s showing the build process as well as many videos on how to use the unit for a number of different test scenarios. All parts have been ticked off the part list as they are packed and hand written notes about other bits not contained in that list have also been added.
The level of care and detail are very evident and Lou has really gone out of his way to produce a wonderful kit, made with high quality parts and I am looking forward to spending some time putting this together and using it in all the filter experiments i have planned. I might not have the money to buy an expensive frequency analyser, but with this and the 12mhz function generator I have, i can still find 3db points and measure the level of harmonics after low pass filtering. And one thing im looking forward to, is being able to set the gain on buffers used on mixers without having to convert rms volts into dbm, as this RF meter gives to the power in dB’s. Awesome.