How to Build A 130 Watt Dummy Load for HF Ham Radio. Handles 100 Watts for 10 minutes, 1500 Watts for 10 seconds. (Refer to drawing and photo below) Editors Note: This simple project enables you to build a very small QRP 50 ohm dummy load that fits inside a suitable sized pill bottle and can take up to 10 watts of rf on hf. About 20 years ago–maybe more, actually–I purchased a Drake 300W dummy load. This is a factor of four. When the external reference is set at 0.5V, the load current can be adjusted up to 15A (0.5 V / 0.1 Ohm * 3). However, rarely is the one you want to be found! A 100 watt resistor and SO-239. After constructing an AMP6 T-Amp kit, and while testing the maximum power output using 4.7 ohm 50W ceramic power resistors the hot resistors had begun to scortch a cutting mat they were resting on and also melting the wire insulation of test leads which had fallen on one of the … MFJ 264 Dummy Loads are versatile 50 ohm dummy loads. If the dummy load is used for power levels higher than 10 watts simply use more or higher wattage resistors to give a total of about 50 ohms. The Palstar DL1500 dummy load for amateur radio is capable of handling 100 Watts "barefoot" power levels for 10 minutes, and 1500 Watts for up to 10 seconds. Specifications were 150 Watts, DC to I don’t have a 50 ohm dummy load Power measurements require a dummy load. No affiliation, just the largest dummy load in the first catalog I picked up. I noticed 100 watt 50 ohm resistors on eBay listed at five for $6.50 or one for $1.99. Angelo, K3YUN has the parts bagged up and ready to go. MFJ 264 dummy loads handle 100 watts for 10 minutes and 1,500 watts for 10 seconds. That's ok- my amp only puts out 500 watts. This is a 50 ohm load. It comes with SO-239 connectors. Those examples to my eyes looked like a complete mess. A custom designed Hyperbolic cone permits the DL1500 to operate at up to 500 MHz (although there is … BIRD8860-1 8860 Series 1500 Watt Dummy Load (Clean Used Condition) MFR: BIRD ELECTRONICS. MCP4921’s output voltage can be adjusted to upwards to either 1 x Vref or 2 x Vref, so the current range can be doubled via a software command without the … It has a strong lightweight aluminum construction. 1 * LM8272 op-amp 2 * IXTK46N50L N-type Mosfet WATT METER. Home Equipment How to Build A 130 Watt Dummy Load for HF Ham Radio. A custom designed Hyperbolic cone permits the the DL1500 to operate at up to 500 MHz. Wrap-Up. (Read 14514 times) 0 Members and 1 Guest are viewing this topic. The resistor in the Drake dummy load is inside a perforated metal enclosure and is air-cooled. Otherwise, I would just use a subwoofer array as a load. FIGURE 1. Review Summary For : Palstar DL1500 1500 watt Dummy Load; Reviews: 13 MSRP: 79.95; Description: The DL1500 was born out of the need for a dummy load that enables short term off air testing up to 1500 watts for frequencies up to 500 MHz. The resistive element looks remarkably similar to the one in the Cantenna. Looks like I have a 800 watt dummy load right now. Since each resistor can handle three watts, the dummy load will handle six watts. in … They provide accurate, dependable, and practically non-reflective termination for testing and adjusting transmitters under non-radiating conditions If your club has never tried a club build, this would be a good first project for several reasons. PARTS LIST. It handles my 54 MHz and down with ease. The dummy load will allow you to test your radio unit without your signal “getting out” beyond a few feet. A number of operators have already reserved their kits. kv5i. The MFJ-264 is ham radios most versatile 50 Ohm dummy load. Figure 2 shows the impedance of the Mother-Load with the reactive circuit engaged and bypassed (two 8 ohm sections in parallel). The 100 watt resistor and SO-239 connector are shown in Figure 1. Build a simple HF/VHF 100W dummy load Chris G4AKE Every radio amateur should own a dummy load. DIY Speaker / Amplifier Dummy Load. Ameritrons ADL-1500X, legal limit dummy load, lets you run the maximum legal limit of 1500 watts for a full five minutes. Will do a little studying/ learning and improve myself each day along with my " project " 800 watt dummy load. Topic: Want to build a 5 Gallon "Cantenna" dummy load. The one described here is capable of dissipating 100 Watts for short periods of time and provides a low power 50Ω port suitable for connecting a receiver or spectrum analyser for station monitoring. As one example, the MFJ-250 (MFJ Enterprises) is rated for 1kW for 10 minutes and costs about $70. Doug KM4LKC #853 . Instructions to Build the DIY Dummy Load Club Project #makeitradio. A 1500 watt 120 volt heater will consume 375 watts while a 240 volt element will consume only 94 watts at 48 volts. Some of them being of gigantic measurements, some of them are even drowned. Trying to learn on my own, saw a guy on QRZ building a homebrew dummy load and thought I would try building one on my own. The MFJ 264 1500 Watt Dummy Load is one of the most versatile 50 Ohm dummy loads available. What's needed is an adjustable dummy load, or an Elecronic Dummy Load! In this video I go through the building of a paint can dummy load that a ham radio operator may require for testing and tuning HF transmitters. You get SWR below 1.3 to 650 MHz and 1.1 at 30 MHz. A search on the Farnell™ website found a Bourns™ 50 ohm 150 watt terminator 6 mm x 9 mm x 1 mm thick at a very reasonable price. Member Offline ... A 500 watt rated load with a fan blowing air thru the fins will easily handle a 1500 watt carrier for a few minutes, no problem. Looking to build a 1KW dummy load. Bird 8860 Series, RF Loads are self-contained high-power 50 ohm coaxial transmission line RF terminations requiring no outside power source or additional equipment. A custom-designed hyperbolic cone permits the DL1500 to operate at up to 500 MHz, although there is … The dummy load display case. General. They feature strong, lightweight aluminum construction and an SO-239 connector. Two New 800 Watt Hybrid 100 ohm Load Resistor good to 500 mHz for 1500 watt Load. AM junkie and b'cast transmitter designer. Instructions for building a 10 watt QRP dummy load using a Pill Bottle! For instance, by using twenty 2 watt 1,200 ohms resistors instead of R1-R10 and 150 ohms resistors for R11 and R12, the dummy load is turned into a 40 watt version. Handles 100 Watts for 10 minutes, 1500 Watts for 10 seconds. So, inspired by V1.0 of my Electronic Dummy Load which has 2 amp maximum I thought I'd build a bigger unit capable of up to 10 amps @ 25vdc (250watts). They do it all. Today I needed another dummy load for the other repair bench. A custom designed Hyperbolic cone permits the the DL1500 to operate at up to 500 MHz (although there is … Posted date: April 26, 2016 in: Equipment No Comments . Durable, sturdy gallon can measures 7 1/2 (height) by 6 5/8 (depth) inches. The DL 1500 is air-cooled, so there is no messy transformer oil to deal with. The DL1500 dummy load is capable of handling 100 Watt "barefoot" power levels for 10 minutes, and 1500 Watts for up to 10 seconds. The Palstar DL1500 dummy load for amateur radio is capable of handling 100 Watts "barefoot" power levels for 10 minutes, and 1500 Watts for up to 10 seconds. First, everyone who puts a signal on the air should have, and use, a dummy load.With older equipment, there was a lot more knob-fiddling taking place each time you changed frequency. A 19-inch rack had a Bird panel wattmeter, which was cannibalised to make a wattmeter with, build in dummy load. Specifications: Hyperbolic tuning cone Impedance: 54 Ohms +/- 5% Frequency range 1500 Watts up to 500 Mhz This auction is for two pieces of hybrid 100 ohm terminating load resistors rated at 800 watts continuous power dissipation each when installed on an appropriate heat sink, giving the necessary parts to build a 1500 watt load by installing the in parallel. level 1. Here are the instructions to complete the kits. No idea if it would work as a dummy load, probably inductive. The Build: I have already seen a bunch of examples on how to build a dummy load with an abundance of same value 1/2 W resistors. After scouring the internet I can across a few nice articles from K4EAA and AI4JI which used common 1K 3W resistors and some mineral oil in a paint can. From a different direction - so called 'dummy loads' for testing ham radio equipment are readily available. The Palstar DL1500 dummy load for amateur radio is capable of handling 100 Watts “barefoot” power levels for 10 minutes, and 1500 Watts for up to 10 seconds. Since I didn’t have one, a hunt was on to source the parts to build a dummy load. Palstar’s air-cooled DL1500 1,500 Watt Dummy Load handles 100 watt “barefoot” power levels for 10 minutes and 1,500 watts for up to 10 seconds. Sure you can just buy a nice 200-300W dummy load for about $50 but thought it would be more fun to actually build one. The MFJ handles powers from 1 watt up to 1500 Watt limit. Tagged as: charge controller , diversion load , dump load , saving energy , water heating The whole point of a dummy load is to sink power from the amplifier without producing sound. A custom designed Hyperbolic cone permits the the DL1500 to operate at up to 500 MHz (although there is … With a nominal SWR below 1.3:1 to 650 MHz and … As the resistors were designed to be used as RF loads, I decided to make a good dummy load using only tools that most homes have. This is a simple DIY Speaker dummy load that was put together very quickly. Many of those oil filled electric heaters you can buy at walmart or whatever have a 50-55 ohm 1500 watt heating element. By using two 100 ohm resistors in parallel your dummy load will exhibit the required 50 ohm load. However, there are a limited number of extra kits available, so let us know if you would like one. ADL-1500 has a heavy duty 50 Ohm resistor. , cb dummy load, homemade dummy load 200 watt, home built dummy load, how to build a wet dummy load for cb, make 1000 watt dummy load, dummyload 1000 watt, building your 1000 watt cantenna dummy load, how to make a dummy load, how to make a 1000 watt dummy load, how to make a 500 watt dummy load, dummy loads to build to build 200 watts Google around, not seeing plans for one. At the left a homebrew Bird clone with build in 150 Watt (hybrid) dummy load and at the right a genuine Bird 43. It does it all -- works with all radios from 160 Meters through 650 MHz and from QRP to the full 1500 Watt legal limit. Went to lowes and picked up a 1 quart paint can. Ameritrons Legal Limit dummy load gives you SWR under 1.2 to 30 MHz and low SWR to 400 MHz. A common approach is to connect multiple Figure 1. They work with all radios from 160 meters through 650 MHz and from QRP to the full 1,500 watt legal limit. 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