|Customer Reviews for the MFJ-9214.|
|From: David Little AF5U|
|The QRP wattmeter/Dummy Load was delivered to my door today from Main Trading Company - Paris, Texas. I took it to my shack and hooked it up to my KX1 Elecraft for testing. I had already checked my rig at the monthly NorTex QRP meeting for output power. The MFJ-9214 showed full scale on all bands. I knew that was not correct. So, I opened it up and checked the calibration pot. It was adjusted for maximum sensitivity. The factory had never calibrated it! So, I calibrated it myself. The PCB inside was the same as the MFJ-840 with one difference that I could see (10K in MFJ-840 was 47K in the MFJ-9214). The dummy load consisted of two 100 ohms 1W resistors in parallel. MFJ rates these at 15 seconds key down time running 5 watts. I heated up my soldering iron and sourced four 51 ohms resistors and fitted them inside the wattmeter in a "H" configuration. That works better for me. The rule of thumb is twice the wattage for a given output power yields 100% duty cycle. So mine is now running 4 watts - I have 100%. I like that better. |
The fit and finish was exactly what I wanted. The meter movement scale is very readable and is dampened to be rugged. Half scale on this meter is about 1 watt and 40% is about .5 watts. The right side of the meter is non-linear and 2-5 watts are very close together. But, for my purpose it's ok. So, what is my purpose? When I go to QRP meetings I check my QRP power with other member's rigs. The size of this device is well suited for this purpose.
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