Wow, thats a few bucks pissed away.
Good video even though I thing luke is a douchebag.
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HG WTF!
- Thread starter nomadradio
- Start date
Wow, thats a few bucks pissed away.
Good video even though I thing luke is a douchebag.
Excellent!
Need to Drive out the Parts suppliers? Your supply competition?
How do you do that?
Destroy their economy?
No, well - at least not directly...
Make things cheaper throughout the supply chain...from the discrete level and the Basic substrate (raw ore) on up to the sheer "copycat" of the original die...(MRF 454 - MRF455?)
Make it so that the others cannot follow our steps - bury our work into the very hills of our Fathers lands and shut out any contact to the outside world just to make these parts and pieces to fit only what we make - ignore all else. Make it so that no one can even repair or restore what which we build - for only we can offer any hope of making it work for you again - no one else can...
Whatever they bought from scrap dealers and wholesalers that broke down these machines, dies and platforms - into buyable, shippable pieces to migrate over to another country - only to be reassembled as an actual machine for them to study - I see that plain as day in this...they found a way...
Heck, everything I type, you post - we add in replies - can all be read and processed anywhere in the world. As I try to help others fix radios - someone else learns too. But to what advantage? I don't mind sharing way to fix things...What I do worry about is those that take advantage of others that don't know. Those that really should learn that could benefit themselves and others from it.
I got called confrontational before...If that's' what you think I am, you're missing the point of this post...
Look Up Advocate instead...
It's a little bit closer to the mark of what I am...
(SEE: MOM, MOTHER - LIVELYHOOD)
Philippines, Taiwan, Malaysia - Japan - see a pattern? It's where our technology went for building the communication devices we own now, follow the trail. Only now, where can you buy any of it, parts or replacement that is even close to what we USED to have to make what we hold as working asset to even own. Not here...unless it in Bob's basement or Nana's Attic - we can't supply or make any of it anymore - something about toxicity...
This Is The 2SC2789 World - You're Just Living In It...
By the way did you notice - Toshiba is Bold Font, Proportional spaced, not mono-space font - BBI did a great job in pointing that out...
If you don't see these colors on your TV set...
Note, TOSHIBA is not just a word, it's a brand...
That TOSHIBA design is a LOGO...
Just remember that what comes up in this vid is about how we are buying this remake technology. We took faith in the Manufacturers that they took care of removing or destroying the very technology that can be used against us, we surrendered that to a scrapyard or got it mothballed - only to have the very pieces brought back to be assembled by a country that sees any other competition as a threat unto itself and will act accordingly - we, by buying this stuff are funding, the companies backed by and follow thru on that very notion...
Guys, this is why Amateur radio is vegetating - it's why CB is the way it is - fewer and fewer of us are left to care about the (Gosh Darn) sakes of others...
WOW!
In reference to the above, you can find more of my thoughts here...Made in Chicom
Hope the guy gets this straightened out...
If you watched the whole video, you'll see the loophole the vid discusses, used in such a fashion that it is used against our own manufacturing process as well as retail.
I could go on...
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I think the point is that the days of quality Japanese transistors is over and all thats left are cheap knockoffs and no one knows how many amps are now full of fake Toshiba's.Excellent!
Need to Drive out the Parts suppliers? Your supply competition?
How do you do that?
Destroy their economy?
No, well - at least not directly...
Make things cheaper throughout the supply chain...from the discrete level and the Basic substrate (raw ore) on up to the sheer "copycat" of the original die...(MRF 454 - MRF455?)
Make it so that the others cannot follow our steps - bury our work into the very hills of our Fathers lands and shut out any contact to the outside world just to make these parts and pieces to fit only what we make - ignore all else. Make it so that no one can even repair or restore what which we build - for only we can offer any hope of making it work for you again - no one else can...
Whatever they bought from scrap dealers and wholesalers that broke down these machines, dies and platforms - into buyable, shippable pieces to migrate over to another country - only to be reassembled as an actual machine for them to study - I see that plain as day in this...they found a way...
Heck, everything I type, you post - we add in replies - can all be read and processed anywhere in the world. As I try to help others fix radios - someone else learns too. But to what advantage? I don't mind sharing way to fix things...What I do worry about is those that take advantage of others that don't know. Those that really should learn that could benefit themselves and others from it.
I got called confrontational before...If that's' what you think I am, you're missing the point of this post...
View attachment 33633Unless you like buying vowels, Don't call me a U - U you ... You. .. you...
Look Up Advocate instead...
View attachment 33634
It's a little bit closer to the mark of what I am...
(SEE: MOM, MOTHER - LIVELYHOOD)
Philippines, Taiwan, Malaysia - Japan - see a pattern? It's where our technology went for building the communication devices we own now, follow the trail. Only now, where can you buy any of it, parts or replacement that is even close to what we USED to have to make what we hold as working asset to even own. Not here...unless it in Bob's basement or Nana's Attic - we can't supply or make any of it anymore - something about toxicity...
By the way did you notice - Toshiba is Bold Font, Proportional spaced, not mono-space font - BBI did a great job in pointing that out...
Just remember that what comes up in this vid is about how we are buying this remake technology. We took faith in the Manufacturers that they took care of removing or destroying the very technology that can be used against us, we surrendered that to a scrapyard or got it mothballed - only to have the very pieces brought back to be assembled by a country that sees any other competition as a threat unto itself and will act accordingly - we, by buying this stuff are funding, the companies backed by and follow thru on that very notion...
Guys, this is why Amateur radio is vegetating - it's why CB is the way it is - fewer and fewer of us are left to care about the (Gosh Darn) sakes of others...
WOW!
Hope the guy gets this straightened out...
I could go on...
That being said at least the HG pills are a better quality knockoff than the fake Toshiba's but I still won't pay for the hg what I was paying for toshiba.
These technologies were developed by scientists from around the globe. None of this was Americas alone. Its only been in the last 30 years we've seen the stealing of tech by the Chinese and poor quality copycats. Now with the internet its easier to peddle their junk to unsuspecting buyers.
The moral of this video is Know Your Sources...
The Toshiba has a typical power gain of 15.5db where the Mitsubishi FET has 11.5db. This means the drive power to reach the 100 watt rating should be close to double on the Mitsubishi.
Copying the input and output transformer ratios in an HF rig will go a long way at getting both of those impedances close to 50 ohms too. Do not rely on the overly simple bias circuit in the datasheet either. Copy the bias from the HF rig because thermal tracking becomes important with these parts when operated at full output in class AB.
Looking at the typical power curve graphs in the RD100 datasheet, it shows that 11.5db gain point is at 10W input power, basically saturating the transistor close to 117W output. The gain goes up as you back the power down to the 100W point and goes up significantly if you are running them at about 50% like they are used in HF rigs. This is true of the Toshiba 2879 parts also. This is why negative feedback from collector to base or drain to gate is required to make the gain curve as flat as possible from 0W to 100W. You must reduce the gain at lower power levels to be equal to the higher power levels. This also causes the overall drive requirements to increase somewhat.
From what little hands-on experience that I have with the RD100 parts, they take very little drive to get a pair of them to 100W (how they're are used in an HF rig). Compared to more modern Mosfet technologies, like LDMOS, the RD100's gain is more like a bipolar device, but I suspect that their gates can be blown just as easily as most other RF Mosfets when overdriven. That would be my main concern.
From what little hands-on experience that I have with the RD100 parts, they take very little drive to get a pair of them to 100W (how they're are used in an HF rig). Compared to more modern Mosfet technologies, like LDMOS, the RD100's gain is more like a bipolar device, but I suspect that their gates can be blown just as easily as most other RF Mosfets when overdriven. That would be my main concern.
I built a monobander using 2 of the rd100’s several years ago. Did well, a pair with 20w pep drive is pushing it. Saw just over 200w pep. Input was a little touchy, was only able to get down to 1.2vswr. Yes it has temperature controlled tracking. Did a little testing with. Worked well, but when it was put on a friends spectrum analyzer had an oscillation. Redid a few things, but haven’t had a chance to recheck. One day I’ll get back to it.
Yes the HG2879 is very fragile. Broken many of the tabs just lifting the legs to check device. Don’t forget when using HG devices they have to be matched or they will not play well. Overdrive and overvolting will kill them quickly. Once the device tests down to about 6 or below, they tend to oscillate and won’t cut off. Meaning scrap bin. Seen a few mobiles when this happens, they will sit there and draw current all the time until power disconnected. Now the HG2879C is looking like a better option. They take more drive. The gain is lower but more suited to 11m operators.
From what I understand the only place to purchase somewhat reliable hg transistors is RF parts.
And when Crusher says "matched" he means matched on a tester not lot/date matched.
And when Crusher says "matched" he means matched on a tester not lot/date matched.
Last time Crusher mentioned a certain tester the price went through the roof. I finally bought one after the price came down a couple of years later.
Anyone remem E.F. Hutton? When E.F. Hutton speaks, everybody listens lol!Last time Crusher mentioned a certain tester the price went through the roof. I finally bought one after the price came down a couple of years later.
Ain't Nothing Like A Plate Modulated Maul.
73
Jeff
Oops, back to the Transistor topic.
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