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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 22nd Sep 2022, 9:25 am   #1
60 oldjohn
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Default Radio Receiver BC-454-B

My friend brought this around. Can anyone tell me anything about it? What is missing?
John.
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Last edited by Cobaltblue; 22nd Sep 2022 at 10:22 am. Reason: title
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Old 22nd Sep 2022, 9:31 am   #2
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Default Re: Radio Receiver BC-545-B

The Dynamotor is missing.

It sits on those 3 pins and provides the HT.

Cheers

Mike T
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Old 22nd Sep 2022, 9:36 am   #3
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Default Re: Radio Receiver BC-545-B

Think this cover the 80M band, they all vary and some 455Kc were used as a tuneable IF.
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Old 22nd Sep 2022, 9:43 am   #4
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Default Re: Radio Receiver BC-545-B

One of the series of Command sets used in WW2 US aircraft. Much info on the Internet.
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Old 22nd Sep 2022, 9:44 am   #5
60 oldjohn
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Default Re: Radio Receiver BC-545-B

Thanks Mike, so that is what the 4 rubber vibration mounting posts are for. I took the lid off part of it and inside are the valves and inside the lid it says Dynamotor. So is that part of the power supply?

John.
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Old 22nd Sep 2022, 9:56 am   #6
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Default Re: Radio Receiver BC-545-B

The dynamotor provides the HT supply (around 250volts) input from the 28 volt aircraft supply. The heaters of the valves are connected to be run from the aircraft supply.
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Old 22nd Sep 2022, 10:22 am   #7
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Default Re: Radio Receiver BC-454-B

Normally 12V valves inside.
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Old 22nd Sep 2022, 1:26 pm   #8
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Default Re: Radio Receiver BC-454-B

This article is a good introduction:
http://www.g4kfk.co.uk/5702_RSGB_Command_Receivers.pdf
. . . and similar here:
http://www.ad5x.com/images/Articles/ARC5convert.pdf
Manuals are on the usual Boat Anchor site.
Peter G3PIJ
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Old 23rd Sep 2022, 6:18 am   #9
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Default Re: Radio Receiver BC-454-B

Check the wiring of the heaters. Many have been converted from the usual 24 V heater supply to 12 V.
The dynamotor uses the same supply to make the HT ( about 225 V DC ).

Those radios can be wonders of sensitivity but the whine/noise of the dynamotor can spoil the joy. Dynamotors need maintenance before using them.

Although i personally run those era radios on dynamotors many use mains power supplies.

The capacitors in the metal cans need checking, many are bad after all the years. Cans can be unsoldered or opened with a rotary tool with cutting disk.
Change the content and solder the cut-off part with a large iron, the cans are usually made from copper.

Audio output impedance is for higher value headphones. Make sure you use the right type for best performance.
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Old 23rd Sep 2022, 6:46 am   #10
60 oldjohn
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Default Re: Radio Receiver BC-454-B

Thank you everyone for your replies, Set belongs to my friend, he is into clocks. I suspect He may be selling it. Nice to know it could be a very sensitive set. Looks like it has been used on an external power supply, as someone has pencilled in all the contacts.

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Old 23rd Sep 2022, 8:42 am   #11
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Default Re: Radio Receiver BC-454-B

Quote:
Originally Posted by 60 oldjohn View Post
Thank you everyone for your replies, Set belongs to my friend, he is into clocks. I suspect He may be selling it. Nice to know it could be a very sensitive set. Looks like it has been used on an external power supply, as someone has pencilled in all the contacts.

John.
Hi John,

One plus point on your friend's receiver is that the plug-in module below the tuning dial hasn't been drilled out to take a volume control and a BFO on/off switch. That was a common mod and also usually resulted in some butchery inside the set.

The original power connector on the rear of the chassis is still present too, often these were hacked out and an octal socket fitted.

These sets don't fetch big prices usually but with the set in question being largely un-modded it might attract more interest.

Cheers

Roger
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Old 25th Sep 2022, 5:17 am   #12
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Default Re: Radio Receiver BC-454-B

It is part of the ARC 5 series of aircraft radios.
Filaments are wired in series parallel in some models as they used a 24 (28) v dynamotor.

They are asking some insane prices at the U.S. ham fairs for these , based on the last two I went to. Anywhere from $15-$ 95 USD!

If they are restorable, the military aircraft restorers are always looking for them here.
The mounting racks are the hard to find item, especially the multiple radio ones. (I actually had a call from the group that was restoring the WW2 bomber at the Boeing Airplane Museum in Seattle WA. U.S.A. looking for working ones for the aircraft. Sadly, the bomber crash landed in water shortly after take off. Not sure if they re-restored it or not).
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Old 25th Sep 2022, 8:02 am   #13
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Default Re: Radio Receiver BC-454-B

Hi Frank,

The prices you quote are about the same here in the UK, I'd expect to pay about 25 UKP for a modified receiver and maybe 40 UKP for a transmitter. As you say, the accessories are the pricey items, especially a decent modulator. The rarest receiver is the one that covers the Medium Wave as they needed only the dynamotor and heater wiring changed to serve as a 12V car radio.

The ARC-5 was primarily used by the US Navy but the SCR-274N series was used by the USAAF. There's a useful book, published many years ago, that covers a lot of the mods done to these radios and which will be useful for someone "back-engineering" a receiver or transmitter back to the original spec. See:-

http://www.w7ekb.com/glowbugs/Milita...mmand_sets.PDF

I have small collection here with enough hardware to make a single TX and RX installation on two trays and with the original connectors - but I have given up looking for a modulator!

73

Roger


Quote:
Originally Posted by FrankB View Post
It is part of the ARC 5 series of aircraft radios.
Filaments are wires in series parallel in some models as they used a 24 (28) v dynamotor.

They are asking some insane prices at the U.S. ham fairs for these , based on the last 2 I went to. Anywhere from $15-$ 95 USD!

If they are restorable, the military aircraft restorers are always looking for them here.
The mounting racks are the hard to find item, especially the multiple radio ones.
(I actually had a call from the group that was restoring the WW2 bomber at the Boeing Airplane Museum in Seattle WA. U.S.A. looking for working ones for the aircraft. Sadly, the bomber crash landed in water shortly after takeoff. Not sure if they re-restored it or not).
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