air show
0:09
3 ай бұрын
Mr Jingles
1:06
8 ай бұрын
2879 bias circuit part 1 of 2
8:37
Bias 2879 observations
15:58
9 ай бұрын
Cancer .....
9:40
9 ай бұрын
2879 transistor biasing questions
8:21
sb-220 test bench update
8:32
10 ай бұрын
sb-220 all the power update
7:49
10 ай бұрын
tuned coax 2.0
7:37
10 ай бұрын
Sb-220 low on power? or not
24:47
10 ай бұрын
seeds
2:05
Жыл бұрын
low bridge
0:34
Жыл бұрын
what is that?
0:40
Жыл бұрын
sb-220 first fire up
9:38
Жыл бұрын
not allowed?
2:18
Жыл бұрын
stay a step ahead
1:09
Жыл бұрын
Пікірлер
@radioguy19510
@radioguy19510 3 күн бұрын
kzbin.info/www/bejne/r6S7gXqIoqumoLc The truth with proof! This is a myth!
@floridanick
@floridanick 8 күн бұрын
So sick
@sirmister4411
@sirmister4411 14 күн бұрын
This is too funny Wow you really have no clue about rf just by the way you are testing this I’m glad your not an engineer for a radio station.
@electromechanicalstuff2602
@electromechanicalstuff2602 14 күн бұрын
@@sirmister4411 I'd never want that job.... It doesn't pay enough money. I have 1.01: 1 match on 5 different stations all with over 2,000 watts. So I'm doing something right. Have fun and remember if it says high voltage YOU should definitely give it a touch
@geoffmcwiggan2814
@geoffmcwiggan2814 18 күн бұрын
Well done Bubby….. Lmao 👍
@RobB_VK6ES
@RobB_VK6ES 18 күн бұрын
Every thing you did up to connecting the dummy to the end of the coax was a complete waste of time, but I am sure you had fun all the same. There are legitimate uses for tuned lengths of coax but a simple antenna feed line is not one of them assuming the antenna is close to 50 ohms. A half wave (or a multiple of) will show the impedance at the far end be it a short, open or anything in between. That is why your last test with dummy on end of coax read as 50 ohms (= dummy load 50 ohm). If you were to repeat the same test with any of your other cables the result will be the same. It is this special property of a half wave that is the seed of thought for the fallacy that the feed line needs to be a half wave or multiple. It does not. A quarter wave long coax if left open at one end will theoretically show short but will work perfectly if the end is terminated in 50 ohms. The VSWR on a feed line does not change with length. Bottom line forget all the BS surrounding feed line lengths. the correct length of feed line is just long enough to connect antenna to radio.
@electromechanicalstuff2602
@electromechanicalstuff2602 18 күн бұрын
@@RobB_VK6ES I did another video of exactly as u said. And had done it before this video without recording it. When I run cables not half wave the swr and impedance change
@electromechanicalstuff2602
@electromechanicalstuff2602 18 күн бұрын
@@RobB_VK6ES my last video showing what u said is called tuned coax 2.0. no T just dummy load on end of coax each time. I'd love to link it but they will remove comments with links. So look 10 months back in my videos
@eds5977
@eds5977 26 күн бұрын
I have the 803 nice
@deeper4cheaper128
@deeper4cheaper128 Ай бұрын
How long have you been trans?
@electromechanicalstuff2602
@electromechanicalstuff2602 Ай бұрын
@@deeper4cheaper128 u stalking my way old vids
@shotgun1666
@shotgun1666 Ай бұрын
Are you still into cb radio stuff?
@electromechanicalstuff2602
@electromechanicalstuff2602 Ай бұрын
@@shotgun1666 yes.
@brandonnonya3680
@brandonnonya3680 Ай бұрын
Spend a little more and get yourself something reliable!
@brandonnonya3680
@brandonnonya3680 Ай бұрын
I own Blackrocks
@sizemattersoffroad9103
@sizemattersoffroad9103 2 ай бұрын
Have you had any issues with that time delay relay, I am building a phase converter and want to do what you did with the contactors and time delay relay but see bad reviews for them as they aren’t intended for continuous power, that one is rated for 5A was wondering if that has worked for you so far?
@electromechanicalstuff2602
@electromechanicalstuff2602 2 ай бұрын
@@sizemattersoffroad9103 ya I've never had issues. Been running it for years. And I used a cheap eBay brand. Also sold several for friends. No issues I even accidentally left it on over the weekend once. No issues.
@sizemattersoffroad9103
@sizemattersoffroad9103 2 ай бұрын
@@electromechanicalstuff2602 okay awesome, another question I have is it looks like you used 2 resistors from one leg to the other on the contact for the start caps, why is that needed and what resistors did you use?
@electromechanicalstuff2602
@electromechanicalstuff2602 2 ай бұрын
@@sizemattersoffroad9103 it drains the start caps. They came with the caps when I bought em. Not really necessary. I'd have to check to see the value
@sizemattersoffroad9103
@sizemattersoffroad9103 2 ай бұрын
@@electromechanicalstuff2602 oh okay thank you, what size wire are you using going to the timer and from the timer to the capacitor? 14ga?
@electromechanicalstuff2602
@electromechanicalstuff2602 2 ай бұрын
@@sizemattersoffroad9103 timer only controls the coil on the contactor. It can be pretty small it takes less than a half amp to power to contactor coil. I may have used 14 or smaller. The contactor does all the heavy lifting to bring in and disconnect the caps from L1-L3 or L2-L3 sometimes it works better one way or the other but usually doesn't matter
@DannyRaySmith-m4i
@DannyRaySmith-m4i 2 ай бұрын
How much is it worth?
@electromechanicalstuff2602
@electromechanicalstuff2602 2 ай бұрын
@@DannyRaySmith-m4i Macon300 maybe $300 Sb220 $1,000 -$1500 condition
@fredbrauer5429
@fredbrauer5429 2 ай бұрын
Wouldn't cutting coax to zero without the dummy load do the same thing??
@electromechanicalstuff2602
@electromechanicalstuff2602 2 ай бұрын
@@fredbrauer5429 old video I have a few but essentially I believe that's what I did in this video is cut the coax with dummy attached at desired frequency till coax had no influence on the tune
@devaracoleman3642
@devaracoleman3642 3 ай бұрын
He’s a real 🤡 Out the Would work😂😂😂😂
@electromechanicalstuff2602
@electromechanicalstuff2602 3 ай бұрын
@@devaracoleman3642 is that English
@bradleyozbun1012
@bradleyozbun1012 3 ай бұрын
Wow 1st time seeing this at all. They do a great job not letting this out. I want a president that stands for the constitution of the United States of America. One that represents the people is the middle class . R.F.K. just might be the man for the job. 💯 I hope they don't get heir meet hooks into him .
@electromechanicalstuff2602
@electromechanicalstuff2602 3 ай бұрын
@@bradleyozbun1012 then u also need to take the bad with the good. He has said if Congress had a "majority" voted to ban modern sporting rifles he'd sign it.
@rodneydavis8110
@rodneydavis8110 3 ай бұрын
Also most of our old ham tube amps really strain at the upper frequencies, only pentode will have the lower interplate capacitance to work at the higher frequencies of HF
@rodneydavis8110
@rodneydavis8110 3 ай бұрын
I have one and this is normal, 100 watts in SSB 600 to 800 watts pep. Am 100 watts tuned properly 1000 watts out, the only way to get more out is to put more in 200 to 250 watts in will get max out but you will burn out tubes fast KY4ZD
@ozriblit
@ozriblit 3 ай бұрын
You mentioned that one of the pieces of coax has a velocity factor of 1. That can’t happen for anything other than free space. Coax cable. When you look at the specs for coax you will see a number for capacitance/unit length (ft or metres) and the same for inductance. These were what you were reading on both instruments. Also for coax, there are two well understood properties. If a coax is 1/2 λ at a given frequency, the termination at one end is repeated at the other. That is to say that an open will be seen as an open and a short as a short. If the coax is 1/4 λ at a given frequency, the termination at one end is reversed at the other. At the two extremes, an open will be seen as a short and vice versa. These repeat every even multiple for λ/2 and every odd multiple for λ/4. In addition, a coax less than λ/4 behaves as an inductor, over that as a capacitor. This repeats every λ/2. Your VNA has a smith chart. It will show the phase change as you sweep the frequency. Try the λ/4 piece with both an open and a short. You can also try the two short pieces to a T connector and the s11 and s21 ports on the VNA, and calibrate the through. Connect the other pieces of coax to the T and watch the effect when you vary the load. Try the dummy load and some resistors if you have any.
@ozriblit
@ozriblit 3 ай бұрын
The truest thing you said in this video was “I may be wrong”.
@electromechanicalstuff2602
@electromechanicalstuff2602 3 ай бұрын
Hahaha. But I'm not
@ozriblit
@ozriblit 3 ай бұрын
@@electromechanicalstuff2602 you can prove yourself wrong without cutting up any more coax by downloading a good simulator, simNEC comes to mind. Set up a length of 50 Ω coax with a 25 Ω load and a 50 Ω generator Z. Sweep the length between 0 and a bit over 0.5λ and, using the smith chart, see if the SWR changes.
@bharatkumarjoshi1596
@bharatkumarjoshi1596 4 ай бұрын
Diesel power dependable power
@danieldahlin1937
@danieldahlin1937 4 ай бұрын
Do I have to use a bms I have one battery pack Or can I just come off of the t and - to the solar controller
@electromechanicalstuff2602
@electromechanicalstuff2602 4 ай бұрын
100% u need a BMS lots and lots of brands JBD is the brand I'm using. Definitely need something to monitor individual cell voltages and shut down the battery from charging and discharging when maximum reached
@lukewinkler3284
@lukewinkler3284 4 ай бұрын
How much THD is on MEP 802 ?
@electromechanicalstuff2602
@electromechanicalstuff2602 4 ай бұрын
Less than 2%
@lukewinkler3284
@lukewinkler3284 4 ай бұрын
Awesome,thank you for the info😊
@radioguy19510
@radioguy19510 4 ай бұрын
Just use a jumper that conveniently goes from one piece of equipment to the next. The wavelength doesn't matter! This is all voodoo and wives tales!!!!!
@patriot3636
@patriot3636 4 ай бұрын
What length did your RG400 come out to? I got 50 feet of it and I'm interested, so I can use it in my car.
@travishorn1847
@travishorn1847 5 ай бұрын
Lay your coax out straight and see if there is any difference.
@electromechanicalstuff2602
@electromechanicalstuff2602 4 ай бұрын
When I did the initial trimming it was not coiled
@f-j-Services
@f-j-Services 5 ай бұрын
I figure that tiny bump/ripple in sign wave on up and down would be it firing, being a 4 stroke 2 cylinder you should see 2 bumps like what was shown. Very neat to see that.
@KC2SDJ
@KC2SDJ 5 ай бұрын
Did you read the manual on the antenna analyser? Do you know how to use a dummy load?
@electromechanicalstuff2602
@electromechanicalstuff2602 5 ай бұрын
Where's all your educational videos? Oh u don't have any cause your not here to help the community only be a troll and criticize it. Gotcha next
@KC2SDJ
@KC2SDJ 5 ай бұрын
@@electromechanicalstuff2602 kzbin.info/www/bejne/gZ-5hHl7bNCCh5Isi=3xDbhi6hpKLGo5K8
@KC2SDJ
@KC2SDJ 5 ай бұрын
thats not my video but it gets the point across
@KC2SDJ
@KC2SDJ 5 ай бұрын
Ive been attaching coax to antennas for years as a Ham radio operator and the only time coax was needed to be tuned was for repeater filters where receive and transmit on a single antenna happens simultaneously. Tuned feedlines only work at one specific frequency where they are tuned.
@KC2SDJ
@KC2SDJ 5 ай бұрын
When I say they only work what I meant to say is they are only Tuned at one frequency
@KC2SDJ
@KC2SDJ 5 ай бұрын
CB guys are nuts, read a good antenna book before you spend money on equipment you dont know how to use
@brianbelliveau5551
@brianbelliveau5551 5 ай бұрын
I’ve been thinking of getting one, how many KW is that generator?
@electromechanicalstuff2602
@electromechanicalstuff2602 5 ай бұрын
Mep-802 is 5kw rated 6kw actual Mep-893 is 10kw rated 12kw actual. Rated at high altitude to perform. So at sea level u get a but more plus 300% starting surge
@kylewilliams3306
@kylewilliams3306 6 ай бұрын
What plastic ammo box would 2 6.5 150w marine fit on the front for Bluetooth build ?
@DanaTartarini-fp2hn
@DanaTartarini-fp2hn 6 ай бұрын
🎉
@Owl350
@Owl350 6 ай бұрын
He's exactly right and the other two parties have been BRIBED by the same people ! If you don't vote for Kennedy vote for the Socialist Party or you're voting for FASCISM again !
@1883GotDown
@1883GotDown 6 ай бұрын
😊 very nice video bud from Gatekeeper!
@M0RMY
@M0RMY 6 ай бұрын
How does my multiband antenna work with a random amount of coax (the distance from the radio to the antenna) and perfect SWR on bands from 80m to 6m? This is crazy. Why don't you just tune the antenna correctly? You are using 27Mhz - just tune the antenna. The coax is 50 ohms, the radio is 50 ohms - so make the antenna the correct size to correspond (PS it will never be perfect).
@DXCommanderHQ
@DXCommanderHQ 6 ай бұрын
Totally agree Tom!
@electromechanicalstuff2602
@electromechanicalstuff2602 6 ай бұрын
My antenna is perfect 1.1 at the antenna. Your multi band antenna. Is it random bands or is it specifically designed to be bands that are resonant with one another. So in two other videos of mine you watch me change nothing but the length of coax it doesn't even have an antenna it has a perfect match dummy load..... And yet the SWR, capacitance and reactance all changes depending on different lengths. Now let me ask u this. Do you or do you not own an antenna tuner? Regardless of it being external or built into the radio. It does what? It adds either inductance or capacitance to the antenna circuit to make it land on 50ohms right? Ok. Now. If you have a tube amplifier does it or does it not have an input tuning network along with an output tuning network? All my old ones do. Why? If the input tune of the amp represents the load/ antenna as far as your radio is concerned y not just have it at a set tune that is not adjustable? Everyone is going to be using 50 ohm coax between the radio and amp right. So y make it adjustable? It's so u can get the lowest SWR at your radio right? How about the output tuning network. Tune and load right? What is that doing? It's tuning the antenna network for the band you're on right? So yes when I'm running my tube amplifiers it really doesn't matter what length my coax is because the amp has input and output tuning networks to make it as close to 50 ohms as possible. Now come on over tho the CB world of transistor amplifiers..... Almost none of them have adjustable input and output tuning networks. So u can do one of two things. Open the amp and physically modify the input and output tune to match whatever random coax you are using from radio to amp and amp to antenna or the builder of the transistor amp makes every amp tuned for a null coax. I've done both. I build both transistor and tube amps for myself only. I have even added air variable capacitors to my base station transistor amps. But in mobile situations they won't survive and will get out of tune too often. So we build for null coax because that's the only thing I can make consistent. If you plug in an antenna analyzer and tune your antenna for the lowest possible SWR and it's still too high install a null coax to get it to 1.1 or better. When u install the transistor amp that is tuned for that 1.1 match it will be happy and have absolutely no reflect. DX commander I love your stuff. I'm very new to this hobby and you're a pro. I just think that sometimes we get stuck in our ways of it's always worked for me so therefore u must be wrong and it just takes a new set of eyes to ask questions and investigate issues that many people are having but many people just ignore. Yes 1.5 is good enough. But I have always been able to tune my network to 1.1 or better while pushing more power than I care to admit to. The lower the SWR the better your reception will be. That is usually more of a factor for me than loosing a few watts In reflect.
@mahokhan9122
@mahokhan9122 6 ай бұрын
UN's Mr RFK Jr's USA's Love You Jesus Son 👽/ YESHUA Sa ❤️ Very wonderful Love You USA's UNITED STATES's of America's 💞💜💚 ISA son 👽 UN's WORLD UNO 💘 Islam 💗
@mahokhan9122
@mahokhan9122 6 ай бұрын
MAHO MAHO MAREEKH ء
@nightvision327
@nightvision327 6 ай бұрын
YOUR A/C COMPRESSOR IS RUNNING BUT BY THE LOOKS OF THAT COIL NOT FOR LONG!!! YOU FITTIN TO BE HOT THIS SUMMER!!!
@electromechanicalstuff2602
@electromechanicalstuff2602 6 ай бұрын
As a licensed refrigeration technician who works on 500 ton units and smaller. That coil is not that bad at all. I wash em off several times a year. That r410 unit was 2 or 3 years old at the time of this video and it is now 10+ years old and still running strong. I've since sold that house made $150k on the flip to a Friend. now living on some property in the country that has two r22 units that are about 16 years old and run great also and i have two brand new 30lb bottles of r22 i got for free 5 years ago. I'm not worried at all. Plus don't write everything in capitals. It means you're yelling.
@GreenWitch1
@GreenWitch1 6 ай бұрын
We support RFKJ! #Kennedy24❤
@AndrewSparkfish
@AndrewSparkfish 6 ай бұрын
Any idea on the wind speed!
@electromechanicalstuff2602
@electromechanicalstuff2602 6 ай бұрын
I've had 60+ mph storms and it was ok. But we had either a micro tornado or straight line winds come through that finally took it down but it was strong enough to pull several shingles off my room and all the shingles on my neighbor's roof. It broke at the threads on the last pipe at the top.
@gregrobinson1304
@gregrobinson1304 7 ай бұрын
Please pray for this man
@jessicalindsey2616
@jessicalindsey2616 7 ай бұрын
That is why we need Kennedy for president! Vote RFK jr 2024!!!
@Aimsport-video
@Aimsport-video 7 ай бұрын
Tune the antenna at the feedpoint. That will minimize reflections making feed line length irrelevant.
@electromechanicalstuff2602
@electromechanicalstuff2602 7 ай бұрын
U can tune your antenna till your blue in the face. Just like in the video it's a perfect antenna and yet the only thing that changed was the coax length giving you higher SWR by adding different capacitance and inductance. Even with a perfect antenna your SWR will be worse if u don't have a band specific tuned coax
@Aimsport-video
@Aimsport-video 7 ай бұрын
@@electromechanicalstuff2602 Without reflection due to mismatch at feedpoint there will be no standing wave. By coax tuning one is just coping with the frequency of the standing wave interacting with signal, and the commensurate losses and constructive and destructive interference. If changing length or even moving coax vastly changes VSWR, it indicates reflection at feed point as suspect #1 and that bandit is often accompanied by RF on the outside of the coax. Good luck.
@MorecookiesFR
@MorecookiesFR 7 ай бұрын
He got my vote.
@jacquesmartinez6880
@jacquesmartinez6880 7 ай бұрын
I’m rooting for Jesse Ventura for VP
@jacquesmartinez6880
@jacquesmartinez6880 7 ай бұрын
That shit is the truth watch your back RFK
@randiswin
@randiswin 7 ай бұрын
He's sold me! I think he is the most intelligent candidate and probably the most honest one we've had for a long time!😂
@sac1303
@sac1303 7 ай бұрын
This man should be in te oval office. He will be good for American and globally as well. May God keep him safe.
@JBF-GST-Tanda
@JBF-GST-Tanda 7 ай бұрын
Consumer-grade things are built to fail.
@nstout7139
@nstout7139 7 ай бұрын
He needs more air time. I'm fed up with the name calling and exhausted from the anger. I'm feeling more hopeful than I have in a long time. Let's hope he keeps building momentum, I am not looking forward to four more years of the other two
@ozark6454
@ozark6454 7 ай бұрын
Guys you got to get out and campaign for this man , we can’t have another Biden or Trump presidency
@electromechanicalstuff2602
@electromechanicalstuff2602 7 ай бұрын
Trump was fine except operation warp speed, and bump ban, and red flag laws. JFK is also anti pew so I have no vote this time
@mAgsals
@mAgsals 7 ай бұрын
@@electromechanicalstuff2602he is not anti gun, look at his policies