Author Topic: Analog TV Transmitter Teardown Teaser  (Read 28782 times)

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Offline EEVblog

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Analog TV Transmitter Teardown Teaser
« on: January 04, 2014, 09:17:20 am »
A teaser video...
Dave knocks on the door of the local Sydney TV transmitter facility. Will they let him in?

 

Offline SeanB

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Re: Analog TV Transmitter Teardown Teaser
« Reply #1 on: January 04, 2014, 09:19:14 am »
More importantly, will they let him take it apart?

Live?

Keeping the smoke in?
 

Offline hikariuk

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Re: Analog TV Transmitter Teardown Teaser
« Reply #2 on: January 04, 2014, 09:34:10 am »
Awww, only a teaser for my birthday?  I shall sulk.

Looking forward to the full video though - it's going to be awesome.
I write software.  I'd far rather be doing something else.
 

Offline maddhatter

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Re: Analog TV Transmitter Teardown Teaser
« Reply #3 on: January 04, 2014, 09:50:41 am »
DO WANT DO WANT DO WANT DO WANT!!!!
I believe in the philosophy of a ruling class, especially since I rule.
 

Offline Towger

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Re: Analog TV Transmitter Teardown Teaser
« Reply #4 on: January 04, 2014, 10:10:15 am »
Dave, I hope you got shots of the power amps. Nothing better than looking at high power RF 'plumbing'. Are they still going to use the existing final stage amps, what's the output power and are they solidstate or value/ tetrode (correct name sp?)?
 

Offline noisebox

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Re: Analog TV Transmitter Teardown Teaser
« Reply #5 on: January 04, 2014, 10:11:51 am »
Looks great, can't wait to see this! Surprised they'd just offer you this stuff though, they don't suspect you of setting up EEVBlog pirate TV station? :) Great score!
 

Offline EEVblog

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Re: Analog TV Transmitter Teardown Teaser
« Reply #6 on: January 04, 2014, 10:13:18 am »
Nothing better than looking at high power RF 'plumbing'.

Plenty of bum crack shots, don't worry.
 

Offline GK

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Re: Analog TV Transmitter Teardown Teaser
« Reply #7 on: January 04, 2014, 10:31:17 am »
Radio Frequency Systems. I used to personally build and wire those antenna switching frames, in their now no longer existing Broadcast division/factory that was located in Lonsdale, SA.
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Offline JoeN

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Re: Analog TV Transmitter Teardown Teaser
« Reply #8 on: January 04, 2014, 11:07:32 am »
I think this video so far is just brilliant.  In a way, the best one so far.  Dave walks into a TV station with an open door and the guy there, who initially look mean as hell, lets him take as much old equipment as he can carry.  Even more if he had a truck.  Based on being able to talk his way into and out of apparently anything.  Unbelievable!  Great.  Looking forward to the actual opening of this old equipment which was made when I was ten years old.
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Offline MartinX

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Re: Analog TV Transmitter Teardown Teaser
« Reply #9 on: January 04, 2014, 11:47:35 am »
Wonderful! Now put that equipment to use and start broadcasting the EEVblog, no one is using that frequency now anyway.
 

Offline jii

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Re: Analog TV Transmitter Teardown Teaser
« Reply #10 on: January 04, 2014, 12:16:38 pm »
Nice! Can't wait for the actual video!

I got one old TV-amplifier after the finnish analog TV was brought down (1955–2007 R.I.P.)
Image probably below? I added it as an attachment and this is my first post the forums, so I don't know
how this thing works  :)

The height of that thing is four car tires :D Looks a bit same than what Dave salvaged?
Mine is waiting for parts salvaging.
« Last Edit: January 04, 2014, 12:23:10 pm by jii »
Radio amateur from Finland. Electronics hobbyist and automation engineering student.
Working as a live audio engineer since 2001.
 

Offline open loop

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Re: Analog TV Transmitter Teardown Teaser
« Reply #11 on: January 04, 2014, 12:58:45 pm »
As a sound track for a pan shot of the old TX station equipment racks,

Sour times by Portishead?

Chorus being:

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It's true
Not like you do"
 

Offline Towger

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Re: Re: Analog TV Transmitter Teardown Teaser
« Reply #12 on: January 04, 2014, 01:21:00 pm »
Now put that equipment to use and start broadcasting the EEVblog,
Throw a dipole up on the roof of  EEV towers and Dave should get a range of a few K with just the exciter/pre amp stages. The local old dears will be delighted when their TVs start working again. 560+ episodes without a repeat would be somedoing for a modern TV station.

At 34 years old, I would not be surprised if he got the backup TX or even the backup's backup.
 

Offline TheWelly888

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Re: Analog TV Transmitter Teardown Teaser
« Reply #13 on: January 04, 2014, 02:18:28 pm »
The influence of Dave's EEVBlog's YouTube channel in him getting access to the transmitter makes me wonder if the Internet will eventually displace broadcast TV?

Looking forward to the teardown!

You can do anything with the right attitude and a hammer.
 

Offline Radio Tech

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Re: Analog TV Transmitter Teardown Teaser
« Reply #14 on: January 04, 2014, 02:48:59 pm »
Dave that is sweet!   :-+

Cant wait to see the tear down

I had a chance to go in the old channel 7 place here in North Carolina many years ago when they shut it down after building the new one.  It was great.  Had no camera at the time though. Funny thing was I grew up in the shadow of the 1500 foot tower in a old farm house.
Pics of it

http://pages.suddenlink.net/w4ydy/witntv.html

Offline (In)Sanity

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Re: Analog TV Transmitter Teardown Teaser
« Reply #15 on: January 04, 2014, 03:33:54 pm »
As a general class licensed HAM I have to say I just love the RF stuff.  Can't wait.   

Jeff
 

Offline Frantone

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Re: Analog TV Transmitter Teardown Teaser
« Reply #16 on: January 04, 2014, 03:38:39 pm »
A teaser video...
Dave knocks on the door of the local Sydney TV transmitter facility. Will they let him in?

LOL!  Brilliantly done!  Just walked through the door....   ;) wink ;) wink ;) Looking forward to the rest.
 

Offline N2IXK

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Re: Analog TV Transmitter Teardown Teaser
« Reply #17 on: January 04, 2014, 04:26:56 pm »
Can’t wait to see this one!

Hope you at least got some shots of the guts of the power amps and the HV power supply, since you didn’t take them with you. :)

This is a GREAT subject for a teardown, as most electronics folks have never seen or worked with multi-kilowatt RF gear, or “modern” equipment that still uses vacuum tubes. Coax feedlines that look like copper pipes, water cooled dummy loads, all kinds of neat stuff at transmitter facilities, and it is always nice to look at gear that hasn't been built down to a price point, but designed to run 24/7 for years, often unattended.
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Offline electronics man

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Re: Analog TV Transmitter Teardown Teaser
« Reply #18 on: January 04, 2014, 04:43:11 pm »
Dave, what was that guys reaction when he founed out who you were and what you wanted.

im looking forwerd to the teardown lots of high power stuff and lots of RF magic.
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Lurch

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Re: Analog TV Transmitter Teardown Teaser
« Reply #19 on: January 04, 2014, 05:02:09 pm »
Dave, what was that guys reaction when he founed out who you were and what you wanted.

im looking forwerd to the teardown lots of high power stuff and lots of RF magic.

Well, if you watch to the end of the video I'm sure you will work it out.
 

Offline KarlosVandango

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Re: Analog TV Transmitter Teardown Teaser
« Reply #20 on: January 04, 2014, 05:04:58 pm »
Hi Dave,
Looking forward to the teardown... What a cheeky tease!!!  ;D
I'm just making this up as I go along!
 

Offline Terabyte2007

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Re: Analog TV Transmitter Teardown Teaser
« Reply #21 on: January 04, 2014, 05:12:41 pm »
Awesome! Can't wait!  :-+ :-+
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Offline wss

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Re: Analog TV Transmitter Teardown Teaser
« Reply #22 on: January 04, 2014, 05:22:19 pm »
I can't believe they just gave the equipments to you, AWESOME! Can't wait for the videos!!! Really exciting!
 

Offline free_electron

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Re: Analog TV Transmitter Teardown Teaser
« Reply #23 on: January 04, 2014, 05:34:02 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

I must say i am a bit disappointed though. I was hoping for sledgehammers, discgrinders and other heavy equipment to tear down the power endstage ( especially those huge vacuumtubes. I'd love the sound of those being crushed by a large hammer ) , and maybe a backhoe or two to bring down that large tower ...
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Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #24 on: January 04, 2014, 05:34:45 pm »
A friend of mine had been the engineer at the local ABC station for 30 years. He also worked for the other local tv and radio stations who could not afford full time staff. When Disney bought all the abc stations they cut people from every department and since he was the only one, out he went. Nothing more than a computer generated boiler plate letter saying don't let the door hit you on the way out. Now they pay somebody to come up from LA.
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Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #25 on: January 04, 2014, 05:37:54 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

Dinosaur extract if fine. Just something more effecient..  I think they need a jetta TDI or an Audi A3 diesel sports wagon. I get 46+ mpg highway and 36+ mpg in town in my jetta, and it feels like a real car.
Charles Alexanian
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Lurch

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Re: Analog TV Transmitter Teardown Teaser
« Reply #26 on: January 04, 2014, 05:44:59 pm »
and maybe a backhoe or two to bring down that large tower ...

Steady on, digital services are still on, and I'll bet it's also a repeater station as well, and it will have some mobile cells on it.

Have you been near this one?
 

Offline free_electron

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Re: Analog TV Transmitter Teardown Teaser
« Reply #27 on: January 04, 2014, 06:09:01 pm »
 Beam it form satellite. no need for multi megawatt transmitters to get 100 miles of range. much more energy efficient. and the satellite is solar powered !
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Offline N2IXK

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Re: Analog TV Transmitter Teardown Teaser
« Reply #28 on: January 04, 2014, 06:20:16 pm »
Those satellites probably use vacuum tubes in the output stages of their transponders, as well....

http://en.wikipedia.org/wiki/Traveling-wave_tube

Far enough above the earth to be safe from your sledgehammer and side grinder, though...:)
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Offline OrangeJacketGuy

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Re: Analog TV Transmitter Teardown Teaser
« Reply #29 on: January 04, 2014, 06:26:03 pm »
Damn tease was right -- there's all kinds of hardware porn there, and that shot there with Dave and the rails was just too good...
 

Offline Jon86

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Re: Analog TV Transmitter Teardown Teaser
« Reply #30 on: January 04, 2014, 06:49:34 pm »
I hope that first bit was scripted?  ;)
Death, taxes and diode losses.
 

Online PA0PBZ

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Re: Analog TV Transmitter Teardown Teaser
« Reply #31 on: January 04, 2014, 06:56:34 pm »
I hope that first bit was scripted?  ;)

Yes it was.
Keyboard error: Press F1 to continue.
 

Offline electronics man

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Re: Analog TV Transmitter Teardown Teaser
« Reply #32 on: January 04, 2014, 08:24:31 pm »
I grew up ne'er in the shadow of the alexandra palace transmitter where the worlds first tv signal was transmitted the bbc was there until the 60s. I wonder what old equipment they have there hmmm......
« Last Edit: January 04, 2014, 08:30:41 pm by electronics man »
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Offline atw60444

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Re: Analog TV Transmitter Teardown Teaser
« Reply #33 on: January 04, 2014, 08:29:38 pm »
I hope that first bit was scripted?  ;)

 Yeah, I think the station Tech. needs acting lessons!   :-DD
 

Offline jmcdonald

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Re: Analog TV Transmitter Teardown Teaser
« Reply #34 on: January 04, 2014, 11:33:46 pm »
We really need to get you a new car..

or at least repair the roof lining.

http://youtu.be/-MmT72NDtTs

would make a good repair video for the Altzone youtube channel
 

Offline EEVblog

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Re: Analog TV Transmitter Teardown Teaser
« Reply #35 on: January 04, 2014, 11:38:55 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back
 

Offline notsob

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Re: Analog TV Transmitter Teardown Teaser
« Reply #36 on: January 04, 2014, 11:45:58 pm »
perhaps we could get vincent to take a photo of a cardboard cutout of dave sitting in his tesla, just to give dave some inspiration, or make him even more jealous of vincent.
 

Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #37 on: January 05, 2014, 12:24:17 am »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back

You would have to get the extended range battery. We had one for a few days at the adam carolla podcast and we all had a chance to try it out. Not a bad car. By the time you get the top end battery though you were looking at $120,000 or so! Its still a first adopter type thing. 
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Offline NiHaoMike

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Re: Analog TV Transmitter Teardown Teaser
« Reply #38 on: January 05, 2014, 06:02:03 am »
Get as much of the high power RF stuff as you can. The ham radio operators can make use of it.
Cryptocurrency has taught me to love math and at the same time be baffled by it.

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Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #39 on: January 05, 2014, 06:59:53 am »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back

Not exactly the same, but close enough. Only top gear could do it..
Charles Alexanian
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Offline vk6zgo

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Re: Analog TV Transmitter Teardown Teaser
« Reply #40 on: January 05, 2014, 07:39:29 am »
Beam it form satellite. no need for multi megawatt transmitters to get 100 miles of range. much more energy efficient. and the satellite is solar powered !

The Earth Station isn't!
They cost as much to run as TV transmitters any day of the week!

The EIRP of City TV Analog Transmitters in Australia is around 100kW for VHF,a bit more for UHF,but that isn't real power,as the antenna array has around 10dB of power gain within its coverage area.

The CH7 Tx in Perth WA produced 13kW sync tip power (same as PEP,but easier to measure!),
allowing for transmission line losses & antenna gain,it came out as right on 100kW EIRP.

The CH2 Tx had two 10kW units in parallel,as the lowband antennas had less gain.

The quoted output from FM & DAB transmitters is also EIRP.

Contrast this to MF AM,where if you want 55kW.you have to generate it,there is no antenna gain to help you.
« Last Edit: January 05, 2014, 07:41:46 am by vk6zgo »
 

Offline vk6zgo

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Re: Analog TV Transmitter Teardown Teaser
« Reply #41 on: January 05, 2014, 07:57:27 am »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

I must say i am a bit disappointed though. I was hoping for sledgehammers, discgrinders and other heavy equipment to tear down the power endstage ( especially those huge vacuumtubes. I'd love the sound of those being crushed by a large hammer ) , and maybe a backhoe or two to bring down that large tower ...

It would have to be a quite serious hammer,& it might be a bit dangerous,as those tubes use beryllium internally (not in the external ceramic,but for thermal coupling inside).

Bring down the tower?--Some backhoe!!
Another problem,that thing is right in the middle of suburbia,unlike the Perth ones which are up on the Darling Scarp,well out of the way.
« Last Edit: January 05, 2014, 07:59:24 am by vk6zgo »
 

Offline Jon86

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Re: Analog TV Transmitter Teardown Teaser
« Reply #42 on: January 05, 2014, 12:21:24 pm »
I hope that first bit was scripted?  ;)

 Yeah, I think the station Tech. needs acting lessons!   :-DD

I agree!
Death, taxes and diode losses.
 

Offline electronics man

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Re: Analog TV Transmitter Teardown Teaser
« Reply #43 on: January 05, 2014, 12:59:04 pm »
He should make a second journey ther too get even more stuff. He shouldn't tear it all downe because that stuff could be quite valuable in the future.
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Lurch

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Re: Analog TV Transmitter Teardown Teaser
« Reply #44 on: January 05, 2014, 03:33:11 pm »
that stuff could be quite valuable in the future.

That's the exact reason a lot of the members of this community have piles and piles of worthless shit that they can't get rid of, me included!
 

Offline (In)Sanity

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Re: Analog TV Transmitter Teardown Teaser
« Reply #45 on: January 05, 2014, 04:09:11 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back

I think Practical and efficient would go over better.   I went from an SLK (non practical) to a Golf TDI,  and loving every minute of it.   Plus now I can go to a ham fest and load all the crap I want in the back without issue.   All while getting 40+ mpg.   

P.S.  I got surprised and smoked by a Tesla model S while driving the SLK.   I left some vehicle behind and before I could realize it I had a silent whoosh go by me.  I then realized what I had passed was a Tesla.   It was topic for conversation at work that morning.  Nice cars.

Jeff
 

Offline tom66

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Re: Analog TV Transmitter Teardown Teaser
« Reply #46 on: January 05, 2014, 07:54:16 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back

I'd personally contribute to see you tear down a wrecked Roadster -- including some lovely photos of all of the power and system electronics!!
I have seen them go for as "little" as £10k if the battery pack is dead/bricked (0 miles for 3+ months.)
 

Offline free_electron

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Re: Analog TV Transmitter Teardown Teaser
« Reply #47 on: January 05, 2014, 10:22:20 pm »
We really need to get you a new car.. that dinosaur-extact driven thing could use a Mr.Fusion …

How do you think a crowd funding campaign to get me a Tesla would go down?
I'm surprised my POS Vectra got me there and back

I'll chip in my 5$ ( to offset the complaints from people that think the tax break comes out of their pocket )
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Any comments, or points of view expressed, are my own and not endorsed , induced or compensated by my employer(s).
 

Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #48 on: January 05, 2014, 10:26:32 pm »
Lets just do a electric upgrade on that Vectra. What year is it?
Charles Alexanian
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Lurch

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Re: Analog TV Transmitter Teardown Teaser
« Reply #49 on: January 05, 2014, 10:27:22 pm »
 

Offline free_electron

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Re: Analog TV Transmitter Teardown Teaser
« Reply #50 on: January 05, 2014, 11:16:30 pm »
Here ya go

plus : fold the rear seats down, combine it with the 'frunk' and you can drag in massive hauls of equipment (in style)
« Last Edit: January 05, 2014, 11:22:33 pm by free_electron »
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Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #51 on: January 05, 2014, 11:40:23 pm »
What year is it?

1985

no.. it cant be that old! Interior looks too good.
Charles Alexanian
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Offline (In)Sanity

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Re: Analog TV Transmitter Teardown Teaser
« Reply #52 on: January 05, 2014, 11:41:03 pm »
Here ya go

plus : fold the rear seats down, combine it with the 'frunk' and you can drag in massive hauls of equipment (in style)

LOL,  same color as the one that blew past me in my former SLK.   Ok,  I miss the power.  But love the MPG.    Better off with MPG.   I actually thought about buying a Model S until I realized I would just be trying to compensate for something.   Better off spending the extra money on more solar power and/or solar hot water. 

Jeff
 

Online dr.diesel

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Re: Analog TV Transmitter Teardown Teaser
« Reply #53 on: January 05, 2014, 11:41:44 pm »
Here ya go

You mailing your new ride to Dave?  :-//

Offline Driver

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Re: Analog TV Transmitter Teardown Teaser
« Reply #54 on: January 06, 2014, 08:14:16 am »
Long time viewer, first time poster... Good to see ch7 give away the gear like this!

Any ETA's for broadcast? :D
 

Offline williefleete

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Re: Analog TV Transmitter Teardown Teaser
« Reply #55 on: January 06, 2014, 03:53:46 pm »
Can't wait to see all the high power RF porn, dave was practically creaming his jeans at the rails on the rack mount stuff
 

Offline echen1024

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Re: Analog TV Transmitter Teardown Teaser
« Reply #56 on: January 06, 2014, 04:40:31 pm »
What Dave REALLY wants is the Model X SUV. That way, he can haul all types of gear, and, with the top battery, he won't have the embarrassment of saying "This oscilloscope is more expensive than my car."
I'm not saying we should kill all stupid people. I'm just saying that we should remove all product safety labels and let natural selection do its work.

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Offline DeepThought

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Re: Analog TV Transmitter Teardown Teaser
« Reply #57 on: January 06, 2014, 04:47:01 pm »
EEVBlog pirate radio FTW
 

Offline singera

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Re: Analog TV Transmitter Teardown Teaser
« Reply #58 on: January 06, 2014, 10:10:03 pm »
climbing to the top of the antenna
 

Offline calexanian

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Re: Analog TV Transmitter Teardown Teaser
« Reply #59 on: January 07, 2014, 02:02:40 am »
No thank you! I am so glad we have mountains here in California to put our antennas on!
Charles Alexanian
Alex-Tronix Control Systems
 

Offline vk6zgo

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Re: Analog TV Transmitter Teardown Teaser
« Reply #60 on: January 07, 2014, 03:34:27 am »

It's more than 14 years since I've delved into these beasts,so I might have forgotten some points,but here goes:-

I am most familiar with the NEC Transmitters at TVW7,which have Sync Tip Output Powers of 13kW to allow for various losses in the feed system.

In this generation of NEC's high power Transmitters,the Sound (“Aural” in “NEC- speak”) & the Vision  RF signals do not pass through the same amplifier chain,but are passively combined at the output of the Transmitter.


Valve/Tube PA:-(Vision)


Big tetrodes like the NEC 8F76R can easily provide around 13dB of power gain in Television service,with a Sync Tip Output power of around 13kW.

13dB is a convenient figure,as it translates to a power gain of 20times.,so 13kW output requires 650W of drive to the valve PA.

TRPAs:-

Normally,there is one TRPA driving the Vision (Valve) PA,having in this case an output of 650W,& two,(in TVW7's case) or more TRPAs operating in parallel to provide the Aural Output .

The total output power of the sound carriers combined is approx-10dB w.r.t. Vision Sync Tip power.
The TRPAs are also designed to deliver around 13dB of gain,so in each case require around 32.5W of drive from the exciter.

NEC had extensive experience with  BJT RF PAs in their lower power Transmitters,so these TRPAs are extremely reliable in service.

Modular Construction:-


NEC used modular construction extensively in this series of Transmitters.

An example is  the TRPAs &.their power supplies..
These are situated “back to back”,so that if the power supply fails,it may be removed & replaced with a spare without  delving deeply into the “innards: of the Transmitter.

If a TRPA fails,it can simply have the RF connections removed,& be pulled out of the mounting slot.

Note on Sync Tip Power:-

Analog TV systems,except for very early ones,notably the British 405 line system use so called “Negative Modulation”,where the most negative part of the Video signal,the Sync Tips,corresponds to maximum RF Output Power.

This is very convenient when measuring Transmitter Output Power,as a “peak hold” voltmeter may be used .
It is simple to produce such a device which is hardly affected by the 64uS time between Line Syncs.

The reading is really PEP,but it is much easier to perform in this case,than with SSB.
The relationship between Vision & Aural power can also be determined easily using the same meter,as PEP & Average power of an FM signal is the same.(It does get a little bit messier with the 2 carrier Stereo Sound system used in Australia,but is still pretty close!)

Average power can be determined with greater accuracy using a water cooled Load,with the Transmitter modulated  with Blanking & Syncs.
To obtain an accurate figure for Sync Tip Power using this method,however,it is necessary to very precisely set the modulation,so correction factors may be applied.

I have used "around" & " approx" a fair bit,as no components are perfect,or perfectly stable in their characteristics over time,especially large Power tubes.
A tube may have more than 13 dB Power gain when brand new,& require less drive than it will 20000 hours later!



 

Offline dmm

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Re: Analog TV Transmitter Teardown Teaser
« Reply #61 on: January 07, 2014, 10:29:49 am »
Radio Frequency Systems. I used to personally build and wire those antenna switching frames, in their now no longer existing Broadcast division/factory that was located in Lonsdale, SA.

I was at RFS at Lonsdale as well between 1995 and '98. I designed the wiring for the interlock system on the RF power switch panels, amongst other things. Worked for RFS again in 2003 in their Kilsyth facility.

dmm   :-DMM
 

Offline Ed.Kloonk

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Re: Analog TV Transmitter Teardown Teaser
« Reply #62 on: January 07, 2014, 11:33:19 am »
Tease Me...Tease Me...
 

Offline SeanB

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Re: Analog TV Transmitter Teardown Teaser
« Reply #63 on: January 07, 2014, 03:51:24 pm »
Camel toe song? Don't worry, I do not really want to link to it. GIY if you want.
 

Offline Nickk2057

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Re: Analog TV Transmitter Teardown Teaser
« Reply #64 on: January 12, 2014, 04:23:55 pm »
question.... when you went into the place what did the guy ask you and such? made me think that you are not allowed to be inside that place and he may cite you on a trespass warning or something..... sure fooled the hell out of me... lol
just keep believing in yourself.. you can do some remarkable things in your life when you break through the ice and make things happen with the stuff you make
 

Offline rolandpenplotter

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Re: Analog TV Transmitter Teardown Teaser
« Reply #65 on: January 12, 2014, 04:42:47 pm »
Sooooo... Dave.... when are we to expect this amazing video?


:)
 

Offline station240

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Re: Analog TV Transmitter Teardown Teaser
« Reply #66 on: January 12, 2014, 11:34:18 pm »
5 ton truck you say, you mean like the types you can hire for a hundred something bucks a day that come with a tailgate ?

Fair point about the beryllium warning, same stuff in microwave magnetrons.
 

Offline rolandpenplotter

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Re: Analog TV Transmitter Teardown Teaser
« Reply #67 on: January 13, 2014, 11:46:16 pm »
Considering that "Teardown Tuesday" is normally released on a Tuesday, and that tomorrow is Tuesday, I think (and I hope) that this episode will be released tomorrow.

The suspense is too much!
 

Offline electronics man

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Re: Analog TV Transmitter Teardown Teaser
« Reply #68 on: January 15, 2014, 08:01:48 pm »
So when's it coming dave it was Tuesday yesterday we are still waiting
follow me on twitter @get_your_byte
 

Offline rolandpenplotter

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Re: Analog TV Transmitter Teardown Teaser
« Reply #69 on: January 15, 2014, 09:01:10 pm »
So when's it coming dave it was Tuesday yesterday we are still waiting

Dave is a busy chap - patience is an amazing virtue. He has said, on YouTube comments:



(The comment was under video #568)
« Last Edit: January 15, 2014, 09:02:43 pm by rolandpenplotter »
 

Offline electronics man

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Re: Analog TV Transmitter Teardown Teaser
« Reply #70 on: January 15, 2014, 09:49:49 pm »
Well it's nice to have lots of brilliant vidios over a long time to look forward too
follow me on twitter @get_your_byte
 

Offline rolandpenplotter

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Re: Analog TV Transmitter Teardown Teaser
« Reply #71 on: January 15, 2014, 10:01:36 pm »
Well it's nice to have lots of brilliant vidios over a long time to look forward too

Yup :)

If my desire for electronics is high, but my concentration for practical work is dying off (midnight to 5am), I'll type "EEVblog teardown" or "EEVblog repair" into YouTube, and re-watch some of the many hundreds of videos our Dave has shot over the years; they NEVER get boring. Dave is a man with a family and a young child, and he also manufactures things, and does many other "real life" things which we have no right to know about, since it's his personal business. We all want "more more more!" from him because he is SUCH an amazing teacher... but patience is a REAL virtue, and it's SO easy to forget that what we see of Dave on YouTube is about 1% of his whole life (if that?) - I have to constantly remind myself :)
« Last Edit: January 15, 2014, 10:03:12 pm by rolandpenplotter »
 

Offline CRCasey

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Re: Analog TV Transmitter Teardown Teaser
« Reply #72 on: January 16, 2014, 11:53:55 pm »
I have to say that teaser photo at the end of the video is total wave-guide porn!

Thanks Dave.
 

Offline vk6zgo

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Re: Analog TV Transmitter Teardown Teaser
« Reply #73 on: January 21, 2014, 06:57:48 am »
5 ton truck you say, you mean like the types you can hire for a hundred something bucks a day that come with a tailgate ?

Fair point about the beryllium warning, same stuff in microwave magnetrons.

I may have led you astray with the beryllium.

Eimac/Varian & others do refer to beryllium as an internal component of their tubes,but It may be a blanket "protect your butt" thing,as I seem to remember the older documentation specifically referred to its use in water cooled tubes.

There does not appear to be any necessity for its use in external anode air cooled tubes,as there is no requirement to have an insulating material of high thermal conductivity.
The Anode is what gets hot & the fins are directly connected to it,so no thermal link is required.

There is also no requirement for such material in the external insulation,as transfer of heat from the anode to the other elements is not desirable.
 


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