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Author Topic: Cheap 10 meter amp  (Read 78783 times)
KD8MJR
Member

Posts: 5557




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« Reply #75 on: June 20, 2014, 02:25:20 PM »

Why do people keep feeding this Hoax?  Just stop posting and let this fade into the Garbage Bin.
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“A lie can travel half way around the world while the truth is putting on its shoes.”  (Mark Twain)
KA5PIU
Member

Posts: 446




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« Reply #76 on: June 20, 2014, 03:11:00 PM »

Hello.

I am active in Texas with Both the CB and the 10 meter bunch.
So, there are some hams who are upset, somehow this is wrong.
But, facts be that as it may, I find some of the CB stuff interesting.
Think of it as the guy who has this latest whiz bang radio, and I am totally unimpressed.
Yes, I run the cheapest thing I can get.
But, that is the point!
I have a Telefunken 10 meter radio, and am happy with it!
On 160, marine monoband sets of the 60's and 70's work just fine.
Again, hams get upset if they find AM or FM below 50 MHz, except for 160 and 10.
If DX rolls in on the 2 bands, fine, if not, fine.
That is how I feel about all of it.
Enjoy!
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W9FIB
Member

Posts: 2529




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« Reply #77 on: June 20, 2014, 07:09:28 PM »


Now, think about how stupid this sounds.
Dude, you are an idiot! what are you going to do?

I cant say it any better. You describe your writings perfectly! And I don't have to do a thing. You do it so well all by yourself!
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73, Stan
Wisdom is knowledge you gain after you know it all.
W1BR
Member

Posts: 4196




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« Reply #78 on: June 20, 2014, 08:17:04 PM »

Why do people keep feeding this Hoax?  Just stop posting and let this fade into the Garbage Bin.

It is like watching a train wreck... you just can't look away from the carnage.
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KA5PIU
Member

Posts: 446




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« Reply #79 on: June 21, 2014, 02:05:51 AM »

Hello.

As was explained, I was told that some Mitsubishi large screen TV sets have a sweep module that can do above the normal HF.
I decided to try it, and it works.
CB tricks had a little write up about TV sweep sections, both tube and solid state.
I was not aware of that until I went to the flea market today.
But, I was aware of the Mitsubishi large CRT video amplifiers.
In order to make a screen that large display a video image, they have to pump quite a bit of energy on the 3 guns.
SVGA is over 100 MHz, on each gun.
http://www.repairfaq.org/sam/monfaq.htm
I do know that this transistors on such a large set will do 25 watts on 220 per gun amplifier, and they are easy to get, they are mounted on the little PC on the CRT socket.
That project is complete, a 2 watt in, 25 watt out amplifier for a talkie.
So, I have the audio section, it does something like 30 volts on its power supply, not useful in a mobile application.
And the sweep module and its power supply, again, not mobile friendly.
So, no priority.
But, am in San Antonio for a few weeks, and get on the air.
One thing led to another, and I end up at the flea markets.
I see the very same module mounted and being used to demo a Dosy meter!
He has a home built dummy load boiling water.
So, I take notes, ask questions, and confirm what I was told.
They can go to 32 MHz.
Again, there are few technical details as I do not know that much about it.
What I do now know is that a 42 inch Mitsubishi set was produced.
It weights 500+ pounds and needs 20 amps at 220 volts!
It does everything the "smaller" sets do, it is just bigger.
And, as far as all the questions, I have learned more from watching the CB types than I ever did with hams.
I am into Tesla coils, love the things.
CB types? some play with them.
Hams? they are too worried about putting up towers and contests.
Get over it, that is what I am seeing.
The orange vest types? ever look at hamsexy?
Dude, you do not see CB types driving around with red lights and sirens, getting arrested.
Quite a few are licensed Amateur Radio operators. and run 10 meters.
It is super easy, and legal, to tune a monopole to 10 meters, and add a bit of base load for 11 meters.
Use a relay inside the base, a trunk mount works fine, and jump from one band to the other.
One feeds an 11 meter radio, the other 10 meters.
Not only is this easier, it is the law.
Now, with that said, THAT is why there are 2 radios in one box!

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W9FIB
Member

Posts: 2529




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« Reply #80 on: June 21, 2014, 04:51:52 AM »

It weights 500+ pounds and needs 20 amps at 220 volts!
It does everything the "smaller" sets do, it is just bigger.

I got a CB that weighs 800 lbs and draws 30A on 480V 3 phase. It puts out the legal 4 watts.

I got a 10 KW 20 meter amplifier that weighs 6 oz and draws .5A on 12V DC.

I can make up and post ridiculous claims too! And the best part is I can say it and then say I know nothing about it...just like you did.

Since your CB good buddies have all the answers, why don't you ask them for the details? You claim they are so smart. Prove it. Again, put up or shut up.

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73, Stan
Wisdom is knowledge you gain after you know it all.
W1BR
Member

Posts: 4196




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« Reply #81 on: June 22, 2014, 07:06:43 AM »

I see the very same module mounted and being used to demo a Dosy meter!
He has a home built dummy load boiling water.


I guess Dosy-Watts are a bit different than Bird-Watts??   Grin
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KA5PIU
Member

Posts: 446




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« Reply #82 on: June 22, 2014, 07:41:35 AM »

I see the very same module mounted and being used to demo a Dosy meter!
He has a home built dummy load boiling water.


I guess Dosy-Watts are a bit different than Bird-Watts??   Grin

Hello.

Yes, I have found that this is the case.
And, the Bubbler is a device common in some CB shops around here.
A non inductive resistor is placed in a steel pipe with mineral oil and sized so it WILL get hot.
This does nothing special, it is just for show.
A glass bottle and small resistor will do the same thing.
As far as the amp goes, take the carrier, add the amount of modulation, remember that this is HIGH LEVEL modulation, and you come up with the peak power.
Once you do that, the numbers are correct.
Remember, the audio modulation is from its own power supply and was not figured in.
Ask anyone who runs an AM radio station that uses a "Modulation transformer" or "Swinging choke" how this works.
The chief advantage to this is the audio quality.
I am NOT going for El Crapo sound.
I want "Broadcast Quality" and use a Shure microphone, XLR connectors, proper matching transformer, the whole bit.
Although 600 to 700 watts could be done, I run around 250 watts.
This is almost a radio talk show, but without any music, think the ARRL thing or "Newsline".
And, before anyone gets excited, this is a followup to the "El Azteco" show that I host, broadcast.
There is no violation of the rules, no money is involved and it totally deals with the issues of the community, it is an on air version of Blog del Narco.
http://www.elblogdelnarco.info/
That, and this, are opposition to the drug cartels.
Do NOT kid yourself, this is nothing to play with, YOU can end up dead if you screw with it.
I was told that if I did not stop, a cop would die, Bexar county deputy Kenneth Vann was killed within a 3 minute window after I was told this.
Both I and the person at the counter heard this.
I was at the Whataburger in San Antonio when this happened.
I am known as PITA, the Pain In The Ass.
Do a websearch on me and you will find that I have thousands of hits, very popular in the community.
But, if you want to get all upset and push the issue, come on down!
The telephone number for the local newspaper is (210)250-3000.
They had Philip True popped.
Or, how about Stephen Smith? the San Antonio cop?
Yes, I play with CB, a place where anyone can leave a tip, or say what is on their mind, or what have you.
That is what I do with radio, I effect change in the community.
Do YOU have what it takes?
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DL8OV
Member

Posts: 1057




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« Reply #83 on: June 22, 2014, 07:59:13 AM »

"Better to remain silent and be thought a fool than to speak out and remove all doubt."

Abraham Lincoln was a wise man, my time on this thread is done.

Peter DL8OV

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W9FIB
Member

Posts: 2529




Ignore
« Reply #84 on: June 22, 2014, 12:07:45 PM »

Those thousands of hits come from all the times you write in this and many other forums. So it is self made popularity. Nice try to fool people though. Too bad smarter people know better.
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73, Stan
Wisdom is knowledge you gain after you know it all.
WB2WIK
Member

Posts: 21837




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« Reply #85 on: June 22, 2014, 04:03:43 PM »

Just post a few pictures of the finished product working on 10m.

That's pretty easy, would take me about two minutes.

Then we'll know what you're talking about.

Otherwise, it's drivel. Wink
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KA5PIU
Member

Posts: 446




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« Reply #86 on: June 22, 2014, 06:43:51 PM »

Hello.

Perhaps you did not read, the thing is in Sinaloa Mexico.
With that said, the larger the diagonal measure, by the exponent the area grows.
http://www.calculatorsoup.com/calculators/geometry-plane/squares.php
Given that, a 46 inch TV/Monitor would have huge everything.
At this point I really do not care, I am looking for the largest defunct TV I can find!
This started as a solid state Tesla coil project.
The whole point of this was, again, the byproduct of a Tesla coil project to people wanting detailed instructions.
Again, the 10 meter was just an accidental discovery.
With that said, the drivers for the guns for a 42 inch monitor would have to drive 200 watts each gun.
SVGA requires around 150 MHz in bandwidth.
They were built to around 48 inches.
That, and noting 10 meters, is my next project.
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W1BR
Member

Posts: 4196




Ignore
« Reply #87 on: June 23, 2014, 07:21:56 AM »

Great. A Telsa coil being excited by a 28 MHz TV sweep generator.
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KA5PIU
Member

Posts: 446




Ignore
« Reply #88 on: June 23, 2014, 08:26:30 AM »

Great. A Telsa coil being excited by a 28 MHz TV sweep generator.

Hello.

No, a Tesla coil being excited by a few kHz at most.
I was told by a CB'er that some Mitsubishi TV sweep finals can work at 27 MHz.
This is in fact the case.
So, my question was, what is the upper limit?
JRC designs several generic boards for OEM, nothing new there.
Just like the power supply is one other OEM, the audio amplifier is another, etc.
Normal TV sets have the HV section as a part of the main board, and only operate a few kHz.
But, computer monitors operate with a MUCH broader level of signals.
And the larger sets can not have everything on one board.
The largest sets were around 46".
The power requirements grow exponentially with size.
Look at an SVGA monitor, at 34 inches each gun would need around 25 watts of drive at VHF.
And the sweep circuit would have to be at least a few hundred watts.
But, at 46", the CRT gun drive would be around 200 watts on VHF and the sweep circuit would be thousands of watts.
The voltage can not go past a given level or X-Rays are produced, so the amplifier in the sweep circuit has the be unusually linear for a sweep circuit, and my guess as to why the unusually high frequency ability.
But, I was thinking a few kHz, for a Tesla coil.
If I do come across a really large set, and the sweep circuit works to 10 meters, great, a legal limit 10 meter amp.
If not, a large Tesla coil.
Whatever the case, the gun driver amplifiers will yield excellent VHF amplfiers.
The sound system is great for a sort of boom box.
The power supplies allow for powering the radio.
In short, I will work with what is given me, and that was the point.
This was never intended as a how to tutorial, and I am not interested in repair of the set.
Once a really large screen CRT goes, replacement? why?
Modern LCD sets do everything a CRT set does, and use way less power.
But, with that said, I was removing parts to see what they do, nothing more.
This bouncing off in tangents about schematics, etc.
Dude, this was a junk TV!
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W1BR
Member

Posts: 4196




Ignore
« Reply #89 on: June 23, 2014, 08:33:31 AM »

Show us some photos, and some legitimate measurements made with reputable test equipment.  Otherwise, you are just producing generic verbiage with no technical foundation or validity.  Anyone can make wild ass claims.

Tell ya what... why don't you write up your reclaimed 700 watt linear using reclaimed 46" TV parts, and send in to QEX for publication... if that fails, there is always CQ Smiley  Put up, or shut up.

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