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No hay artículos en el carro250W 50 Ohmios Resistencia Carga ficticia RFP 250N50
countrygeek
Comentado en los Estados Unidos el 17 de junio de 2024
These dummy load resistors work great and are exactly as advertised. I feel like I need to say that when the say 250watt, they mean 250 watts. I tried it quickly and about 375 and that was fatal to the resistor. Oh well, my bad, at this price you should buy a handful anyway. They also make a lot of heat. You will need a metal box to install this into and add some heat sinks.These are a great deal and I would purchase this product again.
Ham Radio Dude
Comentado en los Estados Unidos el 17 de noviembre de 2024
I hope I am not being petty about this, but it really is a let down to wait two weeks to receive these, only to find out they are used. At the time of this writing, I have done my best to read through the description and confirm they aren't mentioned as USED.Anyway, this is what I got.
Gregory Lewis
Comentado en los Estados Unidos el 15 de noviembre de 2024
Believe it or not, this 50 ohm, 250 watt RF dummy load resistor, when it's mounted onto an appropriate heatsink of sufficient size and fan cooled, works reliably and works very well! I'm very impressed! I have actually been able to regularly exceed the 250 watt RF limit rating without damaging it and without permanently changing its characteristic resistance. I've pretty much intentionally tortured this little thing to see if I could damage it or otherwise "break" it, lol. So far, it has held up extremely well! For the price you pay for these, they are absolutely awesome and fantastic! I have not yet attempted to place this and it's heatsink in a bucket of water or oil to give it a more extreme test, but as long as the heat can quickly be absorbed and dissipated, it should perform perfectly fine with a lot more RF power applied to it. You just have to keep it as cool as you possibly can, that's all. And keep the water or the oil cooler in a liquid cooling situation, too. Everything has its limitations, and I'm sure that with enough RF power applied, and no matter how much cooling the device and it's heatsink receives, sooner or later it will eventually"break". So far, I have regularly tested this device with up to 500 watts of RF being applied to it, using air cooling with a heatsink and a fan, and it hasn't failed as of yet. I'd say that this device is definitely well worth the money spent for it, and it definitely is a good quality and well made device, too. I'd recommend it! At first I was sure it wouldn't last for very long, but I learned how wrong I really was with my initial assessment! Guys and gals who are radio buffs... You HAVE to get these!
R. Cross
Comentado en los Estados Unidos el 20 de septiembre de 2024
These are great for making a 50 OHM dummy load for any transmitter.
Randrew Thomas
Comentado en los Estados Unidos el 28 de noviembre de 2022
They call it a dummy load, but it sure fooled my transmitter into thinking it was connected to a perfectly tuned antenna... so who's the real dummy here?Seriously, though, this resistor is just as advertised and works very well when mounted to a heatsink (mandatory) via thermal interface material (pad or compound). The nice thing about this resistor's package is it's easy to attach to whatever heatsink solution works best for your situation - you could even embed it into a complete radio system or test equipment solution. I drilled and tapped two holes for M3 screws in the heat block of a large CPU heatsink recovered from a retired computer. I could even add a standard CPU fan to it if I were going to run a transmitter into the dummy load over extended duty cycle.One thing to be careful with: one of the two resistor "leads" is a thin, flat tab of metal near the top of the package that bends easily and is likely to break off with just a little too much fatigue. I recommend soldering your (coax) center conductor onto that tab only AFTER having secured your cable assembly such that wire movement at the resistor is minimized. The other "lead" is the resistor's two-holed mounting tab and is quite stable.
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