Chitika: oscilloscope

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Nice interview by Jeri Ellsworth. This fellow definitely seems to have the Knack. At the end of the video he shows a high voltage supply that he is WEARING AROUND HIS NECK!

Here's Eric's site: http://tubetime.us/

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

I got the BITX 20/40 on the air this morning. The receiver has been working for a week or so, but as usual it was a bit of a struggle to tame the transmitter. I got up early this morning and started poking and probing. I played with the driver and final coils a bit. I had used the same trifilar toroids that I'd used in the BITX 17, but this rig didn't seem to like them. So I went with FT-50-37 bifilars -- that seemed to work better. That IRF-510 seems to put out about seven watts on 40. (I still need to tame the transmitter on 20). The 40 meter signal looked great on the 'scopes (RIGOL and Tek!). Shortly before 8 am I worked AD4SY who reported that I was filling his shack with booming audio. Life is good.

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

Carl (M0ICR ex 2E0TEC) saved the day with my Tek 465 -- he sent the replacement HV multiplier that put the 'scope back in action. (Ace Tek repairman Tad WA1FQO made the repair. Tad sells Tek scopes on E-bay -- check out his products: Search for fqo63 on ebay.)

Carl notes a number of similarities between our workbenches and recent projects. All he needs now is a Drake 2-B!

Alan Wolke said he'd be interested in my reactions to having both a digi scope and an analog scope on the bench. I can already see areas where one might be a bit better than the other. The Tek is better at watching a fast moving audio or SSB waveform. But the Rigol doea all kinds of math tricks. Check out the FFT function shown on Carl's page: http://iqrp.net/

Bill,

I am very pleased that you finally got it working with the help of brothers from the fraternity. Having listened to your latest Podcast I think that must be your alter ego! I have A Tek 465, Rigol 100MHz DS1102E and have built 2 Bitx, one for 20m and the other for right bands- using a DDS VFO (3 if you include the 80m version by Steve Drury G6ALU - look up MKARS80) ...I also have 2 copies of SSD!

My website is here: www.iqrp.net where you can see both scopes in my shack and images of my Bitx and my Hans Summers WSPR beacon!

I have just returned from my local radio club social meeting (the Radio Society of Harrow) and took great pleasure in listening to Soldersmoke 158 whilst driving there ... half on the way there and the other half on the way back.

Very best wishes from London (where it is cold, wet and miserable !)

72/73 de Carl M0ICR (ex 2E0TEC from Nov 13)
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

Santa Claus obviously heard my distress call when the TEK 465 gave up the ghost. This morning it was replaced by a RIGOL digital scope. I'm going through the tutorials. Wow, lots of features. A Black&Decker jig saw also arrived -- this will help in my cabinetry efforts.

Last night just before dinner I talked to Kiyo, JH1MDJ, in Tokyo on 17 meter SSB with the 5 watt BITX. I kind of broke through a small pile-up and we then had one of those "please repeat your power level... I can't believe that is 5 watts to a dipole" conversations.

Happy Holidays to all!

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

Podcast # 155 is available for download (or you can listen by clicking on the button above):
http://soldersmoke.com/soldersmoke155.mp3

October 14, 2013 (Delayed Back-to-School edition)

Topics covered:

-- BITX Beauty -- Building a BITX17

-- VFO woes, and the wisdom of Doug DeMaw's love for crystals

-- Why does a 55 year old man NEED clear nail polish varnish?

-- How the VFO KILLED the Tek 465

-- Trying to fix the Tek 465 (not for the faint of heart)

-- New products: Justin Beiber Duct Tape, bifocal safety glasses,
magnetic reading glasses, Ward Silver's new book

-- Backwards British Bike Brakes

-- MAILBAG

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

Thanks to the manual provided by Jim and the HV test gear provided by Alan Wolke, I was able to finish the troubleshoot on the broken Tek 465. It is the HV multiplier, U1432. The cathode voltage is supposed to be -2450. It initially tested at -1000. The manual calls for a jumper to be removed to take the HV Multiplier out of the circuit. As soon as I did that, the cathode voltage went to -2500. Bingo.

Now I have to get a replacement for U1432. Any carcasses laying around?

Thanks guys.

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

The TEK 465 'scope is as they'd say back in the Bronx "a piece of work." It has real character. Perhaps a bit too much. If you look closely, you'll see transistors in sockets. I had kind of gotten my head around that, when I noticed that many of the transistors were not in sockets. They looked like they had been soldered to into the holes in the PC boards. But NOOOOO! They are snugly in the holes, but they are NOT soldered in! You can pull them out, then (if you are lucky!) slide them back in. There is even quite a bit of "ugly construction." with connections floating in the air. You can really see the influence of tube era thinking in this instrument.

I think I have narrowed the problem down to the HV supply. Alan Wolke is lending me a high voltage probe. I hope to be able to get it fixed this weekend. I need to get it working because my BITX 17 is nearing completion and I'll need the 'scope for the lineup and de-bugging.

The picture above is from: http://www.eevblog.com/forum/projects/tektronix-465-repair-and-restoration/ More pictures of the scope are available there. Also see http://www.spurtikus.de/basteln/repair/tek465/index.html for more scenic views of this instrument.

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

I'm having TeKnical difficulties. My beloved Tek 465 'scope quit on me. I'd been running it continuously for a day or so, watching the output on my BITX VFO. Then, suddenly, it blew the 1.5 amp fuse. I replaced the fuse, but afterwards the trace was gone and the "Low Line" light was acting weird -- on when it should have been off, then flickering. I consulted with Alan Wolke. He happened to be out at TEX HQ in Beaverton, Ore. He provided some good suggestions, but before I had a chance to try them, the trace came back. I attributed this good luck to the Radio Gods being pleased with Alan's presence in Beaverton... but my reprieve was short-lived. Trace went out again today.

I found this video of the legendary Jim Williams (RIP) fixing a Tek 465. (Check out Jim's junk box!)
I'll start by checking the Tantalums. I may get lucky.

If anyone has any other suggestions, send them this way. The Tek scope may be old, but it is a COMPLICATED piece of gear...

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

I don't know, I think I like my Tek 465 better! But if any of you guys are thinking of buying one of these, PLEASE do so via the Amazon link on my web page!

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

I know many of you guys have seen this before. And I know that Farhan is tired of seeing it pop up again and again. But it just appeared on my Facebook page today and I watched the whole thing and saw things I hadn't noticed before: There's a Heathkit HW-101 (or maybe its an HW-100). There is a Tech 465 oscilloscope. There is a BTX-20!

Our book: "SolderSmoke -- Global Adventures in Wireless Electronics" http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20

Chitika

Clocks, CRTs, HV supplies: Eric has The Knack!

BITX 20/40 Build Update #5: It is ALIVE!

Digi 'scope, Analog 'scope

Santa Arrives at SolderSmoke HQ! Rigol and Black&Decker

SolderSmoke Podcast #155 BITX17, TEK465

Tek Troubleshooting Triumph

Inside a Tek 465

Fixing TEK 465 Oscilloscopes

Oscillo-porn! A $500,000 Oscilloscope! (video)

Ham Radio, the tsunami, HW-101, Tek 465, BITX-20

AHMED HASSAN MOHAMMED

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