You did a great job, I got the can at ace, got resistors on e- bay, and one sided circuit board on e-bay! Mine were 3 watts so it should do legal power or a little less. My three tube 811 will not do 1 kw any way. Very sad nothing made in the USA! Our politicians have sold our job’s away to China. What a shame. I am glad I am old! JohnBoyUtah KJ7TBR 🇺🇸😎📡🎙🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
@rusty1187
Жыл бұрын
1kw would probably melt down my antenna!
@Brenda-jf2pe
Жыл бұрын
My antenna is a SF360 , 1kw, from Sigma Comm in the UK! It will handle power from the three tube 811 I am sure! 73 JohnBoyUtah KJ7TBR 🇺🇸😎🎙📡
@Dave-VK5PL
6 ай бұрын
You have 16 banks of 5w resistors. That makes 80watt not 240w. You would have to have all 48 resistors in parallel to get to 240w. Plus they are all touching each other. You need a gap between all the resistors for the oil to work at dissipating extra power.
@royhopkins974
Жыл бұрын
Great video. How is the heat dissipation in oil calculated? How long can you use say 1kw continuous before the resistors get too hot?
@rusty1187
Жыл бұрын
I have NO idea!!!! I don't even have a transmitter that will produce 1KW!!! If you try it out, please post the results here!
@jeffalessi
3 жыл бұрын
Just for future reference, mineral oil will not go rancid like cooking oil. On a separate note, most Ace Hardware's stock new empty Gallon Paint Cans for $4.99 each.
@rusty1187
3 жыл бұрын
Thanx! That's good to know!
@lomgshorts3
8 ай бұрын
"Rancid" cooking oil has a smell, no doubt. But it still cools just the same. You may wish to change it out every 18 months, but it is certainly cheaper than mineral oil !!
@azarellediaz4892
6 ай бұрын
@@lomgshorts3 you can either spend $20.00 on a gallon of mineral oil ONCE or $6-8 for cooking oil five or more times.
@BigJohnsHamShack
6 ай бұрын
Is it vital that the pain can be metal? All RF is directly returned correct?
@rusty1187
6 ай бұрын
Yes. the can acts as a Faraday shield for the RF energy.
@Brenda-jf2pe
2 жыл бұрын
Lester’s stuff is way over priced! I was disappointed that he did not give resistor values, but it is reverse engineered real easy! Yours is a good video. I was told that the relief valve is important in the lid ! Like the Heath Kit version! JohnBoyUtah KJ7TBR 🇺🇸🇺🇸🇺🇸😎🎙📡
@rusty1187
2 жыл бұрын
I did eventually add the power output jack like on the Heathkit cantenna. I just built it on a tie point terminal strip fastened to the SO-239 bolt.
@azarellediaz4892
8 ай бұрын
@@rusty1187any chance you can add a link to what you used? Thanks.
@azarellediaz4892
6 ай бұрын
Hello. You mention a relief valve, can you provide a link to where we can see the style/ model/ brand of said valve, or where to purchase one? Thanks.
@Brenda-jf2pe
2 жыл бұрын
How many Watts????????😮
@azarellediaz4892
6 ай бұрын
How did you determine that this is a 2.5K watt unit?
@rusty1187
6 ай бұрын
I did not. that is what Lester claimed in his build video, and that was suppose to be "peak-envelope-power" SSB and intermittently at that. I merely reverse engineered is so people could build it. Lester never told what the resisters were, how many or what wattage. I used 48 270 ohm, 5 watt resistors in series-parallel. I needed something to test with that would hold at least 100 watts straight power, and i figured this would do the trick.
@chrisg6910
Жыл бұрын
What size can did you use?
@rusty1187
Жыл бұрын
I used a one gallon paint can, and 48 270 ohm 5 watt resistors
@rizqim4ul4n4
Жыл бұрын
how to make a dummy load 50 Ohm 100W support 0-3Ghz Frequency?
@rusty1187
24 күн бұрын
the resistor lead lengths would definitely be a factor!
@usuario4937
Ай бұрын
Error + error
@Brenda-jf2pe
2 жыл бұрын
Can’t get those resistors any more Lester bought them all from China Skum Bag!
@rusty1187
2 жыл бұрын
This is suppose to handle 2500 watts Peak Envelope Power.... I.E. sideband. And i'm thinking probably not continuous! I bought a lot of fifty 5 watt, 270 ohm resistors for my build. got them off EBAY. It took 48 resistors i believe.Getting an empty metal paint can was difficult too. www.ebay.com/itm/311310282887?hash=item487b89f087:g:~qQAAOSw435iPI3r&amdata=enc%3AAQAHAAAA8JkApe8m76fsf0jGhgVzX%2Bp8byezzq%2BWKXKyKftPLzVAV0Un%2FeZsn4MNhLUfU41Wxt%2Fp3VaPAaIk%2BskQKPLBkAphCDriHMgrE4Vx9aQnOM7blxXjFDGJDLlMB7Qo0ZwHxmth6a%2ByDUhHvkot75rQiwL0EcC1hg5Lzrrq9Q1wUc33%2FBGRjCduN8voxocrnwMvhSi6DNMXuYY3F3oBua4YISriU6jU%2BuMg1FXGptFxxR6fimTJBtKxJnkdnwbeZU%2B%2B46Ts1n0NDteIoau4mCmmcvKvz8xoaIaLypbpEvpBEcAvBsAy9gJeEEMH8y0Zn31pjQ%3D%3D%7Ctkp%3ABFBMjOysjf9g
@bparker86
Жыл бұрын
Yea I can't stand him either.
@andrewverran3498
Жыл бұрын
@@rusty1187 i thought you had to use carbon film if submerged in oil??
@rusty1187
Жыл бұрын
@@andrewverran3498 i believe that's what i ordered. NOT wire-wound!
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