Podcasting since 2005! Listen to Latest SolderSmoke
Thursday, May 19, 2011
OK, OK, I won't cut open the USB cable,,,
I foolishly thought I could just open that baby up and work on it like the old serial port cables. I have been told (many, many times) that this can't be done. Man, you know things are getting complex when the cables have schematics. G8INE sent me the above diagram of a USB-Serial converter cable. E-bay here I come!
The W8SX Drake Interview
Bob, W8SX, (aka "our man at Dayton") conducted an interview with Bill Frost, Service Manager for R.L. Drake -- a fellow who knows a lot about the history of our beloved (and ever-more-valuable!) Drake 2Bs:
-- The Drake 2-B was designed and built in the early 60’s, but was not continued because R4 was its replacement. It was hoped that the 2-C would be a replacement for the 2-B, but the companion CW transmitter 2NT caused hams to associate the 2-C with a novice station and the sales number show that is was not as popular because 2-B with non-novice hams.
-- Why no crystal filters? Crystal filters not considered because of cost in terms of design & parts. In addition the LC filters allowed the designers to provide passband tuning both easily and cheaply in the 2-B.
-- How did it stack up against other receivers of the era? The 2-B was better than anything else for sale except Collins receivers, which cost a great deal more. There was also the R390, which was available on the surplus market, but it frequently was not is good shape and again cost a lot more.
-- Who designed it? The 2-B was designed by several engineers, but principally it was both Milton Sullivan & Bob Drake.
-- Why the copper chassis? Bill was not sure on this point other than to say that the Cu was meant to keep corrosion of aluminum chassis components to a minimum. Later they use cadmium as in the R4C/T4XC combination. In a couple of instances the chassis was plated with chromium and these radios are very rare and expensive collector items.
-- How important was the 2-BQ multiplier? While this is a highly sought after item today not very many were sold with the 2-B or even the 2-C. Today these are very valuable and command prices well above their original list price.
-- Was dial parallax a problem considered in the design? Not really as the crystal calibrator was supposed to be used along with the lines on the main dial slide to indicate the exact frequency. Band to band variation was very good for the time at around 3kHz. Not bad for a press DDS VFO.
-- Does he still have a 2-B? YES! And he would not part with it for any amount of money.
-- How many were made? He was not sure about this, but did say that the receivers are numbered consecutively, so that by knowing the first 2-B and the first 2-C it’s a simple subtraction to find the numbers of each manufactured.
-- Was it a big seller for Drake? Yes, but the R4 line which had a longer run and therefore sold more. The TR-3, and TR-4 line was a big seller for many years until the Japanese cut into their market share.
-- The TR-7A was Drake’s last ham gear and now they manufacture only home and commercial satellite receivers. These sell well to commercial cable, dish network, lodge net, channel modulators, D-A converters. They are now located in Franklin OH.
-- No ham gear is made by Drake these days as it is all commercial receivers for the satellite TV/radio market. The R8 was their last ham receiver and it still sells well on the used market.
-- For replacement tubes look to http://www.tubesandmore.com/. The transmitting tubes, 6JB6’s, are particularly hard to find. Look for a substitute sweep tube that can be used in that circuit.
-- John M Cherry, John Covelli, WB4HFN and Evin Rolek K9SQG@aol.com host the Drake Forum every Dayton Hamvention run by. A good resource for repair is John Kriner, WB4HFN
-- Drake's web sites: http://www.n9bor.us/drake.htm & http://home.online.no/~
To preserve the parts on a 2-B, especially the cosmetic parts, keep it out of sun & don’t smoke. These parts are particularly had to find these days.
Wednesday, May 18, 2011
How many Drake 2-Bs? The German Tank Problem
-------------------
Hi Bill,
I was just listening to your latest soldersmoke podcast and your
discussion about how many Drake 2Bs were made. Without knowing the
exact serial number for the last Drake 2B before the Drake 2C was
made, you can estimate what that number might have been by knowing a
few of the real serial numbers that are being used by people today.
This is a mathematical problem related to the somewhat famous "German
Tank" problem. Check out:
http://en.wikipedia.org/wiki/German_tank_problem.
If you were to ask your listeners to report to you their Drake 2B
serial numbers you could estimate the largest serial number there ever
was from the formula on that wiki page. This could be a fun exercise
:) I've never had a Drake 2B so I can't contribute. But I could do the
estimate for you if you gave me the numbers.
Cheers and 73
Scott (K6AUS)
Alan's "Scopes 4 Dopes" (present company excluded, of course)
Tuesday, May 17, 2011
EDN Article on April 1 and other Pranks
http://www.edn.com/blog/Anablog/40759-Pranking_bosses_friends_and_competitors_.php
Here is one of my favorite segments (it involved a 'scope and a soldering iron):
You should beware of prank escalation. Len Sherman, application engineer at Maxim recalls a prank exchange with Jim Williams when they were at MIT. As he loves to do, Williams had bought an old broken oscilloscope and worked on it all day, bringing it back to life and perfect operation. After Williams went home for the night, Sherman put a piece of toilet paper under Jim’s oscilloscope graticule. The paper was unnoticeable, but made the scope trace fuzzy. It looked like a focus problem. Jim went crazy the next day trying to fix this problem. He had the covers off and was measuring all the high voltage circuits. It took a few hours before he found the paper.
To retaliate, Williams took the hinge pins out of the lab door and tied a rope to the doorknob that he pulled back into the room, threw over a beam in the ceiling, and tied to 100 pounds of ballast. The next morning Sherman put the key in the lock and turned the knob. The entire door left it hinges and glided, upright, back into the lab about 10 feet. It then stopped and fell over. “It looked like something out of a Stephen King movie,” recalls Sherman.
Sherman then rigged up a water nozzle to a photo-switch triggered by the lab lights. He rigged a soldering iron with coil of solder around it used as a fuse, to time out the prank. Sherman didn’t want to flood the lab, just run the water nozzle for a minute or so. Williams got wet.
Monday, May 16, 2011
20% off on SolderSmoke -- The Book
For more info on the SolderSmoke book see http://soldersmoke.com/book.htm
Sinclair 1000 Computer For Sale
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320699873588&ssPageName=STRK:MESELX:IT