[ARC5] BC-454-B Power

[Mike Bracey]

 Well, after following along for a couple of days and reading all sides, it looks like it's time to settle this with"Trial By Combat". :>)Mike, KER5YTV


    On Tuesday, July 20, 2021, 7:44:37 AM CDT, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:  
 
 Hello Mike,

There are no filaments in Command sets. 

What gets really overheated in a 12 V setup is the wiring to the dynamotor,
and the remote control switch, particularly at start-up. Bare 22 g wire is
rated at 0.5 A. When it is coated in insulation, that falls to 0.3 A. The
heater wiring in a 24 V setup is 0.45 A; in a 12 v set up, it is at least
0.9 A. Add 3.5 A running a 12 V dynamotor, and you're way over. Then allow
say 13 A at startup.

I have a feeling that the next time you study English language, Command set
circuits, electronics and Ohm's law will be your first.

73 de Brian, VK2GCE

-----Original Message-----
From: Mike Feher [mailto:n4fs at eozinc.com] 
Sent: Tuesday, 20 July 2021 10:22 PM
To: 'Brian Clarke'; 'Kenneth G. Gordon'; 'MICHAEL BITTNER';
arc5 at mailman.qth.net; 'Robert P. Meadows'
Subject: RE: [ARC5] BC-454-B Power

Brian - 

You have to be kidding. You are saying that doubling the current in the
filament wiring is bad and they will overheat? It does not take any heavier
gauge wire for that small current in either case. This discussion has really
gone on too long and deteriorated rather than helped. 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115

-----Original Message-----
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf
Of Brian Clarke
Sent: Monday, July 19, 2021 11:18 PM
To: 'Kenneth G. Gordon' <kgordon2006 at frontier.com>; 'MICHAEL BITTNER'
<mmab at cox.net>; arc5 at mailman.qth.net; 'Robert P. Meadows'
<rpmeadow at bellsouth.net>
Subject: Re: [ARC5] BC-454-B Power

Hello Ken,

The 6F6 metal tube has the same dimensions as the 12A6.

Converting to 6 V tubes puts a heavier load on the heater wiring and remote
control switch. Not good.

The Australian government had Command receivers' heater circuits rewired for
the Avro Anson aircraft, which is a 12 V machine. And then used DM-53Z 12V
dynamotors.

<snip>

I know that too, Brian, but the 6F6 is a much taller and fatter tube and
won't fit in the radio with the covers on.

In any case, as far as I am concerned, converting the radio to use either 6
V tubes, or to change to all parallel filaments are really stupid ideas.

Ken W7EKB

Cheers, Brian, VK2GCE

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