[ARC5] BC-221

Paddy Ryan pei7cn at eircom.net
Thu Nov 15 03:25:03 EST 2012 

I have a nice one here and was thinking of using it as a VFO for a 
DX-40..any ideas and would I just key the cathode thru a choke?..it is very 
stable..73 de Pat/EI7CN

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Sent: Thursday, November 15, 2012 2:38 AM
To: arc5 at mailman.qth.net
Subject: ARC5 Digest, Vol 106, Issue 71

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Today's Topics:

   1. Re: [armyradios] BC-221 Coupling (Bill Cromwell)
   2. Re: [armyradios] BC-221 Coupling (J. Forster)
   3. Re: [armyradios] BC-221 Coupling (Mike Everette)


----------------------------------------------------------------------

Message: 1
Date: Wed, 14 Nov 2012 21:00:28 -0500
From: Bill Cromwell <wrcromwell at gmail.com>
Subject: Re: [ARC5] [armyradios] BC-221 Coupling
To: Jay Coward <jcoward5452 at aol.com>
Cc: ARC5 at mailman.QTH.net, armyradios at yahoogroups.com,
Milsurplus at mailman.QTH.net
Message-ID: <1352944828.3364.35.camel at lancelot>
Content-Type: text/plain; charset="UTF-8"

On Wed, 2012-11-14 at 20:21 -0500, Jay Coward wrote:
>
>  But then if you have one that has no cal book and  you can "cal" it
>  against another with a cal book for the frequencies  of interest then
>  maybe you might find that as a useful experimenting  platform.    I've
>  always thought the LM could make a really hot regen  rx with the
>  proper mods. When the 80 and 40 bands are long and quiet  I've hooked
>  the long wire to the LM and had very good clear copy,  although low
>  audio.  Jay

Hi Jay,

A missing cal book is no reason to chop a LM or 221. A new cal book can
be made fairly easily with the help of a spread sheet and a couple of
cups of coffee. A new cal book could be made before that. In fact the
originals were made with a personal computer to help. If they could do
it in the 1930s it can probably still be done.

There are some fellows who built regens and direct conversion receivers
based on an old LM or 221. The way you described using yours was about
the same as a DC receiver but not optimized for that.

My heterodyne frequency meters shall remain on duty as heterodyne
frequency meters until my heirs deal with them some day. I have looked
for LMs and 221s that are "beyond repair" to use for parts in other
projects. I haven't found any that can't be repaired. Anybody? That's a
challenge. Send your "beyond repair" LM or 221 here for 'burial'.

73,

Bill  KU8H



------------------------------

Message: 2
Date: Wed, 14 Nov 2012 18:13:08 -0800 (PST)
From: "J. Forster" <jfor at quikus.com>
Subject: Re: [ARC5] [armyradios] BC-221 Coupling
To: wrcromwell at gmail.com
Cc: armyradios at yahoogroups.com, arc5 at mailman.qth.net,
milsurplus at mailman.qth.net
Message-ID: <60479.12.6.201.2.1352945588.squirrel at popaccts.quikus.com>
Content-Type: text/plain;charset=iso-8859-1

I have an Excel file that makes the books, but I'm not sure if it's a
generalized solver or for a specific unit, as I've not really looked at
it. It appears to interpolate regularly spaced readings, given a slope and
intercept.

I know there are programs on the web to generate the books from measured
data.

-John

==========




> On Wed, 2012-11-14 at 20:21 -0500, Jay Coward wrote:
>>
>>  But then if you have one that has no cal book and  you can "cal" it
>>  against another with a cal book for the frequencies  of interest then
>>  maybe you might find that as a useful experimenting  platform.    I've
>>  always thought the LM could make a really hot regen  rx with the
>>  proper mods. When the 80 and 40 bands are long and quiet  I've hooked
>>  the long wire to the LM and had very good clear copy,  although low
>>  audio.  Jay
>
> Hi Jay,
>
> A missing cal book is no reason to chop a LM or 221. A new cal book can
> be made fairly easily with the help of a spread sheet and a couple of
> cups of coffee. A new cal book could be made before that. In fact the
> originals were made with a personal computer to help. If they could do
> it in the 1930s it can probably still be done.
>
> There are some fellows who built regens and direct conversion receivers
> based on an old LM or 221. The way you described using yours was about
> the same as a DC receiver but not optimized for that.
>
> My heterodyne frequency meters shall remain on duty as heterodyne
> frequency meters until my heirs deal with them some day. I have looked
> for LMs and 221s that are "beyond repair" to use for parts in other
> projects. I haven't found any that can't be repaired. Anybody? That's a
> challenge. Send your "beyond repair" LM or 221 here for 'burial'.
>
> 73,
>
> Bill  KU8H
>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>




------------------------------

Message: 3
Date: Wed, 14 Nov 2012 18:38:14 -0800 (PST)
From: Mike Everette <radiocompass at yahoo.com>
Subject: Re: [ARC5] [armyradios] BC-221 Coupling
To: arc5 at mailman.qth.net
Message-ID:
<1352947094.38660.YahooMailClassic at web120901.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

I meant to send this to the entire list.

73

Mike
W4DSE



> From: Mike Everette <radiocompass at yahoo.com>
> Subject: Re: [ARC5] [armyradios] BC-221 Coupling
> To: wrcromwell at gmail.com
> Date: Wednesday, November 14, 2012, 9:36 PM
> If anyone has the male chassis power
> connector for an LM, I'd love to have one... I have an LM-4
> with a 1939 contract date (this may have been the first
> version deployed to the fleet) that somebody took the
> connector from and haywired a power cord directly into the
> unit.? I'd like to restore it.
>
> This is of course the same connector found on the ARB front
> panel, or the Command Set adapter boxes which have a
> connector to plug in an ARR-1 homing device (or DU-1
> loop?).
>
> Parts donors....?
>
> The visual difference between the LM-4 and later models is
> that the main dial's center has a slight "conical" shape to
> it, vs flat on the subsequent versions.
>
> 73
>
> Mike
> W4DSE
>
> --- On Wed, 11/14/12, Bill Cromwell <wrcromwell at gmail.com>
> wrote:
>
> > From: Bill Cromwell <wrcromwell at gmail.com>
> > Subject: Re: [ARC5] [armyradios] BC-221 Coupling
> > To: "Jay Coward" <jcoward5452 at aol.com>
> > Cc: ARC5 at mailman.QTH.net,
> armyradios at yahoogroups.com,
> Milsurplus at mailman.QTH.net
> > Date: Wednesday, November 14, 2012, 9:00 PM
> > On Wed, 2012-11-14 at 20:21 -0500,
> > Jay Coward wrote:
> > >
> > >? But then if you have one that has no cal book
> > and? you can "cal" it
> > >? against another with a cal book for the
> > frequencies? of interest then
> > >? maybe you might find that as a useful
> > experimenting? platform.? ? I've
> > >? always thought the LM could make a really hot
> > regen? rx with the
> > >? proper mods. When the 80 and 40 bands are long
> > and quiet? I've hooked
> > >? the long wire to the LM and had very good clear
> > copy,? although low
> > >? audio.? Jay
> >
> > Hi Jay,
> >
> > A missing cal book is no reason to chop a LM or 221. A
> new
> > cal book can
> > be made fairly easily with the help of a spread sheet
> and a
> > couple of
> > cups of coffee. A new cal book could be made before
> that. In
> > fact the
> > originals were made with a personal computer to help.
> If
> > they could do
> > it in the 1930s it can probably still be done.
> >
> > There are some fellows who built regens and direct
> > conversion receivers
> > based on an old LM or 221. The way you described using
> yours
> > was about
> > the same as a DC receiver but not optimized for that.
> >
> > My heterodyne frequency meters shall remain on duty as
> > heterodyne
> > frequency meters until my heirs deal with them some
> day. I
> > have looked
> > for LMs and 221s that are "beyond repair" to use for
> parts
> > in other
> > projects. I haven't found any that can't be repaired.
> > Anybody? That's a
> > challenge. Send your "beyond repair" LM or 221 here
> for
> > 'burial'.
> >
> > 73,
> >
> > Bill? KU8H
> >
> >
> ______________________________________________________________
> > ARC5 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/arc5
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:ARC5 at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
>


------------------------------

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