Got one from the ham station in evansville indiana the other day. Works well for my station and not a bad price. Never had a dummy load before and I like it. Just cant key up real long but it dont take long to tune the amp. So far its a keeper. Anyone else using one?
-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
-
Retevis is giving away Radios for the New Year and Every Member is Eligible. Click Here to see the details!
MFJ 264 Dummy load
- Thread starter Mr Clean
- Start date
Just like any other "high power" dummy load in this price range: no moving parts, seriously derated above 100 watts ...
Don't overheat it and it'll last just about forever.
Don't overheat it and it'll last just about forever.
Keeping it cooled is critical. Over heat the load and it will be destroyed quickly. At work we have a 25kW water cooled load. It pumps water through the resistor and two radiators. Two large fans pull air through the radiators for cooling. The resistor is rated at only 200 watts, but get keep it cooled and it will dissipate 25000. Apply power without the fans and pump running and the resistor is destroyed immediately.
I do use a fan. But thanks for the tip! I have 2 lasko task fans that come in handy for amps, radios and I guess now dummy loads. Its the top one. I have two.
Cool Tools: Lasko Pivoting Task Fan
Just had a look at the MFJ264 on their web page.
Don't think I'd ever consider putting 1500 watts into it!
MFJ Enterprises Inc.
I have a Dielectric 5700, rated at 1000 watts continuously. It's about 12 inches tall, 6 inches wide, and 24 inches long.
Big difference between commercial broadcast and amateur service power ratings!
Don't think I'd ever consider putting 1500 watts into it!
MFJ Enterprises Inc.
I have a Dielectric 5700, rated at 1000 watts continuously. It's about 12 inches tall, 6 inches wide, and 24 inches long.
Big difference between commercial broadcast and amateur service power ratings!
I also have the MJF-264 and it is a good load for 100 watts or less. It will take many times that but only for seconds at a time and let it cool down between key downs. Pay close attention to the derating curve of the end of it and then go a bit lighter than that.
Warren, here is my dummy load. I believe it came from a Gates AM transmitter. It is ten 500 ohm Globar resistors of 100 watts each (maybe 200 watts??) It is immersed in a 12 (or 16 quart I forget) stock pot full of silicone load oil I drained from a 5 Kw Dielectric load that was toasted. When I had the 1 Kw AM tx for testing it handled the 1 Kw carrier and 100% mod rather nicely.
Warren, here is my dummy load. I believe it came from a Gates AM transmitter. It is ten 500 ohm Globar resistors of 100 watts each (maybe 200 watts??) It is immersed in a 12 (or 16 quart I forget) stock pot full of silicone load oil I drained from a 5 Kw Dielectric load that was toasted. When I had the 1 Kw AM tx for testing it handled the 1 Kw carrier and 100% mod rather nicely.
Actually it was purpose bought just for the dummy load. I know better than to steal the wife`s good cookware.
Its been tuning my base amp so far. 300 watt dk 1200 pep the way im running my amp now. If it blows I go out and buy a bigger one lol. Dont take long to tune a amp your used to tuning.
- No one is chatting at the moment.
