From bcarling at cfl.rr.com  Wed Aug  1 22:07:28 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Wed Aug  1 22:16:55 2007
Subject: [DCboatanchors] FA: Crystals for sale on eBay
Message-ID: <46B10420.12173.318C05@localhost>

FT-241 Crystals available on 396 kHz,  405.5  kHz, 440 kHz, 
481 kHz and 496 kHz

I decided to list my FT241 crystals for sale on eBay with 
low starting prices of $9.99 for trays of QTY 120...
12 for a dollar seems very reasonable!

Please take a look at these items:
Item number: 110155414197	
Item number: 110155415741	
Item number: 110155417014
Item number: 110155418804

Thanks for looking and 73 - Brian


From bcarling at cfl.rr.com  Fri Aug  3 17:42:50 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Fri Aug  3 17:52:41 2007
Subject: [DCboatanchors] Revealing The Truth Behind Z = R + jX
Message-ID: <46B3691A.19393.FA86D3@localhost>

Revealing The Truth Behind Z = R + jX

You all remember that AC circuits formula... the one we 
memorized 
and used, being convinced that it was "real."

Z = R +jX

Have you ever QUESTIONED that mathematical "imaginary 
component" 
known as "j" and which they attach to the reactance? Perhaps it is 
FAR 
MORE imaginary than we all have been led to think!! Discover the 
truth 
about electronics and electricity!  How REAL do you think the 
square 
root of MINUS ONE really is? I think you will find that it is not even 
correct
to call it "IMAGINARY!"

Allow Hubert J. Ohmsberg and his pals to help you make sense of 
it all!

http://tinyurl.com/2mc9ts
From bcarling at cfl.rr.com  Tue Aug  7 07:46:02 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Tue Aug  7 07:56:09 2007
Subject: [DCboatanchors] FA: Crystals to the garbage
Message-ID: <46B8233A.10382.39CB78@localhost>

I decided to sell off my FT241 crystals here.
So far most have no bids so they are available cheap, 
and the auctions end in a couple of days...
They are all going into the garbage if no one bids on them. 
Still running less than 10 cents each...

eBay item numbers:
110155414197
110155415741
110155417014

Regards - Brian, AF4K
From W8EK at speakeasy.net  Sat Aug 11 10:45:12 2007
From: W8EK at speakeasy.net (Ken Simpson, W8EK)
Date: Sat Aug 11 10:55:45 2007
Subject: [DCboatanchors] Radio Communications theory and reference books FS
Message-ID: <009201c7dc26$3d614000$f801000a@kendell>


Radio Communications theory and reference books for sale:

Modern Electronic Communication by Gary Miller
This text book is used in many community colleges, and is an 
exceptionally thorough, yet easy to understand book covering all 
aspects of communications, from Ohm's Law on up.   
Hardback in very nice condition.  $18


ARRL "Radio Amateur's VHF Manual"
1965 - first edition - $10

ARRL "Single Sideband for the Radio Amateur"
1970 - Fifth edition - like new - $10

ARRL "Specialized Communications Techniques 
for the Radio Amateur" - 1975 - First Edition - $7

ARRL "RFI Book"
1999 - First Edition - like new - $12

ARRL "Understanding Amateur Radio"
1977 - $5

ARRL "Satellite Anthology"
1999 - 5th edition - like new - $10

ARRL "Weather Satellite Handbook"
1990 - 4th edition - like new - $10

ARRL "Your Gateway to Packet Radio"
1989 - 2nd edition - $6

ARRL "Radio Amateurs Operating Manual"
1985 - 2nd edition - $8

RSGB "Amateur Radio Operating Manual"
1982 - 2nd edition - $8
1991 - 3rd edition - like new $10


ARRL Handbooks:

These are in the smaller format (6 1/2 by 9 1/2 inch size).  
The small format handbooks include tube charts 
and tube data, plus vintage advertisements.

1947 - 24th edition
This one is very used, as it should be at 60 years old. The spine 
is taped, and the cover is partially loose from the binding. This is 
a very good, usable handbook, but it is not collector quality. There 
are 150 pages of ads in the back, which show a lot of vintage 
equipment, tubes, parts, etc. $18

1969 - 46th edition
Cover is loose, but is there.  All pages are intact, and all 
data present.  $10

1971 - 48th edition
Spine is faded, pages are intact, and cover is good. $12

1973 - 50th edition
Very nice condition throughout.  $13

1977 - 54th edition
Good condition.  $10

1978 - 55th edition
Extremely nice condition.  $13


The following are in the larger 8 1/2 by 11 inch format:

1981 - 58th edition
Nice shape. $14

1982 - 59th edition
Good condition. $12

1983 - 60th edition
Great condition; no problems.  $ 16

1985 - 62nd edition 
Like new.  $18

1986 - 63rd edition
Close to new condition.  $18

1993 - 70th edition - Hardbound
Like new.  $ 20


1981 Foreign Callbook
Very nice condition, with only slight wear. Back cover 
features the Kenwood TS-830 and accessories. $5 


Prices do not include shipping from Florida.

Thanks.

73,

Ken, W8EK

Ken Simpson
E-mail to W8EK@speakeasy.net or W8EK@arrl.net
Voice Phone  (352) 732-8400





From bcarling at cfl.rr.com  Tue Aug 14 06:14:26 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Tue Aug 14 06:25:08 2007
Subject: [DCboatanchors] FS: Large Ceramic Band Switch
Message-ID: <46C14842.18299.84ADD@localhost>

FOR SALE: Large Ceramic Band Switch

5 positions, 2 poles. Silver contacts. This ceramic switch 
has 5 silver plated copper straps attached. It is a used switch 
and has other components attached but can easily be re-used 
for a nice linear amplifier or tuner project.

Dimensions 3.25" diameter X 4" deep. Has standard 1/4" shaft 
that is about 7/8" long. Two hole mounting from front panel.

Heavy duty mechanism, and in excellent condition.

QTY 1 only - available for $8.00 plus $6.50 priority shipping.

Regards - Brian, AF4K
From bcarling at cfl.rr.com  Tue Aug 14 07:33:15 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Tue Aug 14 07:44:12 2007
Subject: [DCboatanchors] FS: ALPHA DELTA TRANSI-TRAP
Message-ID: <46C15ABB.32662.50728B@localhost>

FOR SALE:  ALPHA DELTA TRANSI-TRAP lightning protector.

SO-239 connectors on each end and a binding post terminal for 
ground wire in the middle. Unused - looks new but opened 
package.

Available for $6.00 plus $6.00 USA priority shipping.

73 - Brian, AF4K


From bcarling at cfl.rr.com  Tue Aug 14 10:54:08 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Tue Aug 14 11:04:51 2007
Subject: [DCboatanchors] FS: HY-GAIN CENTER INSULATOR, NEW
Message-ID: <46C189D0.19216.137BDA@localhost>

FOR SALE:

HY-GAIN #155 CENTER INSULATOR - new in package.
Never opened. ACCEPTS COAXIAL CABLE with SO239 
Connection. Includes instruction sheet if you really need it!

This is the heavy duty type with ring hooks for taking the strain 
off your antenna.

Available for $8.00 plus $5.00 shipping




From bcarling at cfl.rr.com  Tue Aug 14 11:57:32 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Tue Aug 14 12:08:15 2007
Subject: [DCboatanchors] FS: 811 Tubes and some XFMRS
Message-ID: <46C198AC.10133.4D8779@localhost>

FOR SALE:

1) FOUR 811 Transmitting tubes - these are good, used tubes
in the boxes. (not 811A)
Will sell the set of four for $32.00 plus $9.50 shipping

2) Group of 120V AC transformers... all in exc. shape.
QTY 1 - 18V at 3.5A but looks more like 5 or 6 amp size.
QTY 2 - 12V at 8 Amps or 24V CT at 4 Amps
QTY 1 - UTC type F-3416 battleship gray potted unsure of 
voltages.
Will sell the four as a group for just $12.00 plus $9.50 shipping.

E-mail me off the list for either deal.
73, Brian, AF4K
From bcarling at cfl.rr.com  Mon Aug 20 09:14:13 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Mon Aug 20 09:14:29 2007
Subject: [DCboatanchors] BC348 History (for your enjoyment)
Message-ID: <46C95B65.1107.81F827@localhost>

>From another group: BC348 History (for your enjoyment!)

Early history
1943: RC348R S/N 16743 was built by Belmont Radio under a large
contract with the US Army Air-force.  It was delivered to the San
Antonio air-force base and likely installed in a B-series bomber (B24,
B25, B26... no information on this.)  Subsequently, S/N 16743 may have
flown thousands of hours in WW2 to who knows where...  Britain,
Germany, China, Pacific islands campaign?  We know it was not the
Doolittle raid or it would be scratched up a bit!

1945: Continued US service in peace and local wars... could have been
anywhere... Europe, Asia, Korea, US home front?  Whatever happened to
that aircraft and her crews, S/N 16743 survived without a scratch.

1960's (speculation) Aircraft was decommissioned and S/N 16743 put in
storage or sold surplus to, I suspect, someone in aviation or
avionics. It was used in receive-only mode at some point since the
power socket jumpered where the "mute-receive/transmit" switch is
wired.  Some time afterwards it was taken to the town of Shawinigan,
Quebec, Canada.

My history
Early 1970's:  I got his unit in the early 1970's.  I lived in
Montreal and had recently got my private pilots licence.  My air
transport pilot friend, John Ainsworth, said there was a couple of
surplus "aircraft radios" in an FBO's office at the Shawinigan
airport, that we could buy "as is".  He closed the deal at CDN$50 for
them both (almost the same as US$50 back then.)  I flew John up in a
Cherokee PA-28-140 to pick them up (still have the logbook entry.)
They were both "R" models and were alleged to have come out of
decommissioned US Army Air-force B25's or B26's, but I have forgotten
the details. We put them in the back seats of the Cherokee (checked
the weight and balance!) and flew back to Montreal.  John took one and
I took the other, SN16743.  I have no idea what happened to John's
BC348 and since then we have lost touch.

Mid 1970's
For a while my unit was a static display, I was too busy to look into
getting it working.  A year or so later I got around to restoration -
it did not seem to need much visually.  Everything was there,
including the dynamotor.  Someone had bridged pins 2 and 6 of the
power plug so it had been at least tried out on receiver-only mode,
i.e. no transmitter hooked up.

Of course, I needed a 28 VDC power supply so I built one... but not
very well, I'm afraid!  I built a regulated P/S using a series
regulator transistor (a T-03 based OC28, IIRC) and a zener diode in
the classical circuit after a transformer and FW rectifier.  I made
two mistakes, one easy to fix the other nearly fatal. The easy one:
the base current of the OC28 at full load was too high for the zener,
so I added an extra transistor as a current amplifier (IIRC, as an
emitter follower after the zener.) Problem solved.   The second, and
more serious, mistake was using a power transfomer with too high a
secondary voltage.  I had purchased a 250 VA Hammond transformer that
had a 40 VAC secondary with the notion of having enough volts to drop
across the series regulator transistor. Of course, there were too many
volts and it got too hot! (it had a decent heat sink, too.)  I tried
various work arounds, e.g. using choke input (but I did not have the
right choke, it was too small), and series resistors ahead of the
regulator - but they got too hot.  Finally, I put a separate wirewound
resistor in the 120 VAC lead to the MT and adjusted it so that only 3
volts or so was dropped across the OC28 at about 1.5 amps... about 4.5
watts in the OC28.  It worked but was a nasty kluge to my mind.  I
actually put the ww resistor in a separate porcelain jam jar away from
the chasis, always meaning to put it on posts top-side later.... never
got around to it.  Anyway, we got power!

Back to the radio... I took it down to our then country place near
Magog, Quebec, planning to put up a decent SW antenna... in the
meantime I strung a longish wire out of the window to a nearby pine
tree.  Radio worked on all bands but the dynamotor was quite noisy so
I did not listen much.  Then I got distracted from the project and the
BC348 stayed unused for over 15 years...

1999:  Fast forward forward.  We wanted to divest ourselves of
property in a potentially "separatist Quebec" and get out (should have
done this in 1976, or at least in the 1980's...  never mind!)  We sold
the country place and stored the radio in our Montreal townhouse.  In
1999 my wife and I moved to Thornhill, north of Toronto (what a
relief!), since I had been offered a great job as VP Engineering with
a company in North York (Toronto) just south of the 401.  Radio was
moved, of course, along with tons of other stuff, but that's another
story.  Put the BC348 in storage again.

2007:  Eight years went by and I spent time on other things, including
my engineering work, restoring commercial tube radios, building tube
amplfiers, skeet shooting and relearning the piano.  Circa 2007 the
BC348 at last got onto my "do list" as "test tubes and refurbish".  In
the Spring of 2007 I actually did something about it!  I had already
searched out manuals and schematics on the 'net, so the first task was
to test all the tubes.  All tested "good" to "very good". Then, fix
that bloody P/S!  The regulator was not needed.  The BC348 takes a
nearly fixed current of about 1.25 amps at 28 VDC so a choke input P/S
properly designed would do the job. Fortunately, I now had the right
choke to hand so I simply gutted the old P/S and brewed up a simple
unregulated unit.  It worked fine with very minor fixed resistor
voltage correction.  Now to the radio...

It was, of course still working. I used a matching transformer from
the 300 ohm "Low" phones output to an 8 ohm loudspeaker but the sound
quality was very bad and power very low (designed for phones.) To keep
the radio original, I fitted a small commercial radio OPT (6550 ohms
to 4 ohms) into the chassis (not much room, you have to be very
creative with space.)  Using a spare 6 ohm LS this matched the 6K6GT o/
p tube quite well.  The old OPT was left in, of course, for future
change back to original.  I wired the 4 ohm secondary to the jack
sockets to one of the original phone jacks so that I could plug in a 4
to 6 ohm speaker.  It all worked perfectly, lots of audio power now,
around 2 watts.

Now for the important part... I wanted to bypass the dynamotor so that
it would not wear out - it was too noisy anyway.  But I did not want
to remove it from the chassis as it could get lost over the next 200
plus years...  (This note will be kept with the radio, inside the
chassis.)

I disconnected the 5 dynamotor leads from the dynamotor terminal strip
and connected them to a new 4 terminal strip (one point is common),
carefully mounted under the chassis near the dynamotor - there's not
much room, I used standoffs and two new holes (allowed!)  I connected
this terminal strip to a 4 wire cable to the external P/S's.  This
cable is actually a 3 wire plus insulated shield cable (shield, red,
black and white.)  Red goes to what was dynamotor B+; black goes to
what was dynamotor B minus (NOT chasssis, it's NOT the same - check
the schematic, you "smell a rat" when you see the 6K6 cathode is
connected to ground); shield goes to chassis and white goes to pin 2
of the 6K6 output tube (NOT to the old 28 VDC + as there is a resistor
("76-A") that drops the 28 volts to 25.2 VDC for the series parallel
tube heaters.

For the B+ I used a Heathkit regulated power supply set to 200 VDC (up
to 220 is OK.)  The heaters are in series-parallel across the 28 VCD
supply with resistor "76-A" to drop 2.8 volts and another one to even
out the 6K6 heater's 0.4 amps and the other tubes' 0.3 amps.  PIn 2 of
the 6K6 is at 25.2 volts above chassis so I used a 24 VAC HVAC control
transformer to run the heaters - AC is fine for this, no hum at all.

That's about it to date.,  No alignment done - it seems good enough
for now.  No paper caps replaced yet as all voltages across them are
normal.  It receives on all bands but I don't have an outside antenna
(no space.)  I plan to take it over to a ham friend's house shortly
and try it on his 160 foot "long" wire to see what it will do.

So, some more history has been preserved for posterity... It's an
honour to own... correction: to have temporary custody, of an original
piece of equipment used by those brave men of the US Army Airforce in
WW2... somewhere under the atmospherics of today's SW stations your
can just hear the faint echo of those big Wright-Cyclone radial
engines, the bursting of flak and the roar of twin 1/2 inch
Brownings...

Roger Jones  August 2007

= = =

Great History - enjoyed the read.
I fllew radio op in Navy Super Constellations in the mid 50's -- we had a 
BC348 at the Radio Op position.
On off duty hours I would listen to stations all over the Pacific on the 
shop BC-348.
Thanks for the memories (as Bob Hope sed)
Lamont

= = =

I cannot speak for all cases, certainly, but I understand that the 
aircraft factories did the original installations of radio equipment 
during the final phases of airframe construction, to include the cable 
runs and antennas.  I have some drawing copies from Consolidated that 
show the placement of the BC-348, BC-375, direction finder (MN-26?), 
interphone, control boxes, etc., and to include the associated cable 
requirements and antennas within B-24 aircraft that they were 
manufacturing, at the time.  Also, when the aircraft were ferried from 
the various factory locations to the designated military airdrome, the 
radio equipment was operational. That is not to say that equipment was 
not installed by the military.. to the contrary, especially when things 
were upgraded, etc.  As an aside, I also have a technical tome that 
seems to indicate that Norden bombsights (the sight unit itself) were 
installed by the military under some sort of an umbrella of security.

As a collector and user of a BC-348N and an R, used with an ATC-1 and a 
BC-375, I appreciate the history of these receivers and would be curious 
about the actual lineage of my units. I know one of mine was apparently 
never put into service by the AAF.  Rather, it was sold at surplus, NIB, 
by Radio Shack in 1948. I have the original receipt, found inside the 
cabinet, as bought from the original owner's family in 1999.  My other 
unit was obviously "used".  I really don't have a clue as to how many 
truly "combat-operational" sets made it to the surplus market.  I 
suspect most were decommissioned along with the associated airframes.  I 
think this is why there are so few rack mounts for many aircraft sets 
vs. the number of radios.  Try and find a rack for an ART-13!  It took 
me 15 years to find the actual aircraft rack (not to be confused with 
TCZ ground version mounting).

Finally, I'll add a tech suggestion.  Some BC-348 versions have a 
gain-leveling pot, mechanically attached to one end of the tuning 
capacitor shaft.  Its supposed to keep the receiver gain level over the 
tuning range of each band.  You can get just a bit more gain by 
bypassing this pot.  If the pot is going bad, it can help a lot to 
bypass it, of course!

 - K3HVG

= = =


From bcarling at cfl.rr.com  Fri Aug 31 14:38:15 2007
From: bcarling at cfl.rr.com (Bry Carling)
Date: Fri Aug 31 14:39:29 2007
Subject: [DCboatanchors] FS: BOOK on Hallicrafters
Message-ID: <46D827D7.28406.8655A@localhost>

BOOK FOR SALE:

"Radios By Hallicrafters, 2nd Edition" by Chuck Dachis

Comprehenmsive volume with many pictures and a lot of 
information. 
Has just a few pages with some highlighter 
and underlining. Otherwise it is in very good condition. 
Hard to find now, and retail price is $29.95 at Amazon.

Available for $16.00 plus shipping.
