BC-221 CALIBRATION BOOK
 

If I recall correctly each calibration manual was part and parcel of the
unit as they were hand calibrated and both shared the same serial
number. www.fairradio.com has the mtce manual.

-- 73
Hank WD5JFR
wrote in message
...
Hi all:

Somebody knows where can be obtained the calibration book of of the
BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

BC-221 CALIBRATION BOOK
 

On Sun, 30 Nov 2008, wrote:

Hi all:

Somebody knows where can be obtained the calibration book of of the BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

Each was hand-calibrated at the factory, and the book matched the unit.
Back then, the articles would all say "make sure you get a BC-221 with a
calibration book", implying that it would be a terrible task to do it
yourself. I have no idea whether that was the case or not, but of course,
things were comparatively primitive back then. With a frequency counter,
it would be really easy, just repetitive, to build up a calibration book.
On the other hand, if you've got a frequency counter, you might as well
just us that rather than fuss over a calibration book.

Like everything else, you used to be able to buy blank calibration
books at the surplus stores. Sixty years after WWII, I have no idea
what kind of stock might remain.

Michael VE2BVW

BC-221 CALIBRATION BOOK
 

Hi all:

Somebody knows where can be obtained the calibration book of of the BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

BC-221 CALIBRATION BOOK
 

Thanks Henry and Michael.-
I found a program to make the calibration book taking only some check
points. -
Thanks again

Heriberto
LU6DBU


"Michael Black" escribió en el mensaje
ample.net...
On Sun, 30 Nov 2008, wrote:

Hi all:

Somebody knows where can be obtained the calibration book of of the
BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

Each was hand-calibrated at the factory, and the book matched the unit.
Back then, the articles would all say "make sure you get a BC-221 with a
calibration book", implying that it would be a terrible task to do it
yourself. I have no idea whether that was the case or not, but of course,
things were comparatively primitive back then. With a frequency counter,
it would be really easy, just repetitive, to build up a calibration book.
On the other hand, if you've got a frequency counter, you might as well
just us that rather than fuss over a calibration book.

Like everything else, you used to be able to buy blank calibration
books at the surplus stores. Sixty years after WWII, I have no idea
what kind of stock might remain.

Michael VE2BVW

BC-221 CALIBRATION BOOK
 

Heriberto
Please tell us what it is, I 'd like to see it.

--
Thanks & 73
Hank WD5JFR
"Heriberto" wrote in message
...
Thanks Henry and Michael.-
I found a program to make the calibration book taking only some check
points. -
Thanks again

Heriberto
LU6DBU


"Michael Black" escribió en el mensaje
ample.net...
On Sun, 30 Nov 2008, wrote:

Hi all:

Somebody knows where can be obtained the calibration book of of
the
BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

Each was hand-calibrated at the factory, and the book matched the
unit.
Back then, the articles would all say "make sure you get a BC-221
with a
calibration book", implying that it would be a terrible task to do it
yourself. I have no idea whether that was the case or not, but of
course,
things were comparatively primitive back then. With a frequency
counter,
it would be really easy, just repetitive, to build up a calibration
book.
On the other hand, if you've got a frequency counter, you might as
well
just us that rather than fuss over a calibration book.

Like everything else, you used to be able to buy blank calibration
books at the surplus stores. Sixty years after WWII, I have no idea
what kind of stock might remain.

Michael VE2BVW

BC-221 CALIBRATION BOOK
 

Henri:-
You will found in
http://www.mines.uidaho.edu/~glowbugs/bc221lmfiles.htm


REgards

Heriberto
LU6DBU
"Henry Kolesnik" escribió en el mensaje
...
Heriberto
Please tell us what it is, I 'd like to see it.

--
Thanks & 73
Hank WD5JFR
"Heriberto" wrote in message
...
Thanks Henry and Michael.-
I found a program to make the calibration book taking only some check
points. -
Thanks again

Heriberto
LU6DBU


"Michael Black" escribió en el mensaje
ample.net...
On Sun, 30 Nov 2008, wrote:

Hi all:

Somebody knows where can be obtained the calibration book of of
the
BC-221?
Thanks in advance
REgards
Heriberto
LU6DBU

Each was hand-calibrated at the factory, and the book matched the
unit.
Back then, the articles would all say "make sure you get a BC-221
with a
calibration book", implying that it would be a terrible task to do it
yourself. I have no idea whether that was the case or not, but of
course,
things were comparatively primitive back then. With a frequency
counter,
it would be really easy, just repetitive, to build up a calibration
book.
On the other hand, if you've got a frequency counter, you might as
well
just us that rather than fuss over a calibration book.

Like everything else, you used to be able to buy blank calibration
books at the surplus stores. Sixty years after WWII, I have no idea
what kind of stock might remain.

Michael VE2BVW

BC-221 CALIBRATION BOOK
 

There were some articles regarding BC-221 calibration
in the late 40s early 50s QSTs.

Pete

BC-221 CALIBRATION BOOK
 

You should be aware that each BC-221 and the other heterodyne
frequency meters had its own individually plotted calibration book so
using one from another meter wasn't an accepted practise.

Still, if you don't have any calibration book anything is better than
nothing.

73,

Michael, W1RC

On Sat, 20 Dec 2008 22:49:15 -0500, "Tio Pedro"
There were some articles regarding BC-221 calibration
in the late 40s early 50s QSTs.

BC-221 CALIBRATION BOOK
 

wrote:
You should be aware that each BC-221 and the other heterodyne
frequency meters had its own individually plotted calibration book so
using one from another meter wasn't an accepted practise.

Still, if you don't have any calibration book anything is better than
nothing.

73,

Michael, W1RC

On Sat, 20 Dec 2008 22:49:15 -0500, "Tio Pedro"
There were some articles regarding BC-221 calibration
in the late 40s early 50s QSTs.

There is an excellent article with photos of the original equiupment
used to calibrate the BC221.It appeared in the Christmas 2008, Issue No.
116 of the UK Publication Radio Bygones. (www.radiobygones.co.uk
www.radiobygones.com)

The article is based on a reference in the May 1944 edition of
"Electronics" (U.S. magazine???)by Philco Engineers which described the
calibration procedure in detail

Those people were really clever!!!

Lionel L Sharp

BC-221 CALIBRATION BOOK
 

On Sun, 21 Dec 2008, wrote:

You should be aware that each BC-221 and the other heterodyne
frequency meters had its own individually plotted calibration book so
using one from another meter wasn't an accepted practise.

Still, if you don't have any calibration book anything is better than
nothing.

73,

Michael, W1RC

We went through this already.

Like I said when this thread started, all the warnings about them
being useless without the calibration book dates from a time when
calibrating them would have been at the least tedious, and of course
few had any good frequency standard.

Pete mentioning that there were articles about calibrating them
yourself is interesting since I've never seen any such thing,
clearly at the cusp of when they were available people did
go to the trouble, but later nobody bothered.

Nowadays, it's a different matter, since anyone with a frequency
counter can live without a calibration book, or at least make
up a calibration book far easier than sixty years ago. They likely
have access to a very good frequency standard too.

Michael VE2BVW

On Sat, 20 Dec 2008 22:49:15 -0500, "Tio Pedro"
There were some articles regarding BC-221 calibration
in the late 40s early 50s QSTs.