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 Post subject: Puzzled with pieces 22/ARC 5
PostPosted: Oct Wed 28, 2020 1:24 pm 
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Joined: Oct Thu 08, 2020 4:31 pm
Posts: 16
Hello everyone,
Do all these parts connect and work together as part of a command set?
Are there other components?
Maybe a microphone?


Attachments:
File comment: BC 455 A
22/Arc5?

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File comment: BC 456 B
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File comment: Dynamotor
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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Wed 28, 2020 2:53 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Somers, CT
Wow. You have a receiver and transmitter that will cover the 40 meter ham band.

The transmitter and receiver appear to be unmodified... depending on condition (paint, etc.) you might have a really nice pair!

The other unit (unpainted) is the modulator for the transmitter!!!! I have several of those radios, but have never found a modulator!


Dynamotor may be the one the sits on the back rear top apron of the receiver.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Wed 28, 2020 3:47 pm 
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Joined: Nov Sun 15, 2015 8:32 pm
Posts: 219
Location: Poteau, OK
Yes, they can be connected as a set but you will need the interconnecting cables which are
difficult to find..

Your top picture shows the BC-455 6-9Mhz receiver and BC-459 7-9.1Mhz transmitter

The second picture shows the transmitter's BC-456/MD-7 "AM" Modulator. The Modulator
provided B+ and filament voltage from the dynamotor that mounted on the modulator. The
Modulator provides approximately 12 watts of audio to modulate a 25-30-watt transmitter such as the
BC-459 7-9.1Mhz transmitter. As a previous response said, the MD-7/BC-456 AM Modulator is qujte
difficult to find.

The last picture shows the receiver's 28VDC 1.1amp Dynamotor (output is 250VDC at 60ma).
The dynamotor mounts on the rear of the receiver chassis and provides the receiver's "B+" voltage.
The receiver's tube filament voltage is provided in "parallel" with the 28VDC "input voltage" to the dynamotor.
The BC-453, BC-454, and BC-455 receivers were designed to be remotely tuned. The flexible tuning
shaft/cable connects/screws into the small opening to the right of the dial and terminates at a remote tuning
box at a remote location in the aircraft.

You can find schematics, wiring diagrams, and other information pertaining to the above
WWII surplus radio and navigation equipment in the Surplus Conversion manuals at
the link below:

https://w5rkl.com/manuals/

Scroll down to the listing titled Surplus Conversion
then click the links to download the individual manuals.

The combination of the receiver and transmitter were referred to as the "Command Set".

B25 radio setup
https://b-25history.org/restorations/radios.htm

Early B29 bomber radio operator setup. Note at the top middle edge of the picture are 3 BC-453,
BC-454, and BC-455 receivers and 2 BC-458 and BC-459 transmitters. The radio just to the "left" of
the operator's leg is the ART-13 HF transmitter.

https://aafradio.org/flightdeck/B-29_radio.jpg

The picture below is a view showing 2 BC-458 and BC-459 HF transmitters and 3 BC-453, BC-454, and
BC-455 HF receivers in a B-17 bomber radio compartment.

http://www.b17queenofthesky.com/ima%20ges/radright.jpg

The BC-453, BC-454, and BC-455 receiver can be tuned locally using an adapter that plugs into and
rotates the variable capacitor. The adapter is difficult to find as are the interconnecting cables, plugs,
and multiple receivers and transmitters mounting plates. The small removable plug-in panel below the receiver dial
has connections for audio output, BFO ON/OFF (CW/SSB reception), and volume control (see the surplus
conversion manuals for details on how to install those connections).

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Mike W5RKL
https://www.w5rkl.com
RMC(SW) USN RET


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 12:34 am 
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Joined: May Fri 01, 2015 2:33 am
Posts: 1644
Location: Roslyn,Pa 19001
Actually the transmitter is a AN/ARC5 T-22 so it does really match the the BC-456 modulator.
Here's some note on getting the tx going: http://radios4fun.net/index.php?p=1_19_ ... 5-Tx-Notes
There is also a good series of ut vids on getting both the rx and tx working.

Terry N3GTE


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 3:37 am 
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Joined: Nov Sun 15, 2015 8:32 pm
Posts: 219
Location: Poteau, OK
The transmitters had several different nomenclatures as did the receivers. The transmitters were
identified as T-15 thru T-22. Some were identified with a prefix of "BC" and others were identified with
a prefix of "CBY" as shown in the following webpage write up

https://en.wikipedia.org/wiki/AN/ARC-5

The picture below shows 2 HF transmitters, BC-457A and BC-458A made for the Signal Corp US Army by Western
Electric.

https://ids.si.edu/ids/deliveryService?id=https://airandspace.si.edu/webimages/collections/full/A19602541000cp04.jpg&max=3000

I paid $15 for a NOS 6.9.1Mhz BC-455 receiver still in its factory sealed box, back in the mid-60s from Fair Radio Sales in Lima Ohio.
Finding a NOS BC-455 receiver still in the factory sealed box is almost impossible.

Anyway, have fun with those old vintage WWII radios. They're fun to get working.

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Mike W5RKL
https://www.w5rkl.com
RMC(SW) USN RET


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 3:54 am 
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Posts: 9601
Location: Beaver Falls, PA. USA
I got one of those receivers going as a teenager, back in the early 1970s; it was the 3-6 mhz model. I used the conversion instructions from an article in the June, 1963 issue of Popular Electronics, and still have it!

At this point, all of the multi-section "flower pot" capacitors will be leaky, and there is one electrolytic in there to change, on the B+ line.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 1:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 904
Location: Sullivan, MO
Radioroslyn wrote:
Actually the transmitter is a AN/ARC5 T-22 so it does really match the the BC-456 modulator.


I think Terry meant to say that it doesn't really match the BC-456 modulator. The T-22 transmitter is part of the Navy AN/ARC-5 system which uses the MD-7 plate (and screen) modulator. The BC-456 is a screen modulator that is part of the AAF SCR-274N system. The AAF version of the transmitter is the BC-459. The difference between the two transmitters is the connector on the rear and the way the plate and screen voltages are fed for the power amplifier tubes. Either way, you would need to be a licensed radio amateur to be allowed to use the transmitter on the air. The receiver can be used without a license.

If you want to use these, they really should have the "flower pot" capacitors replaced. You would also need to get either the correct racks that the receiver and transmitter slide into and connectors to connect it all together, or make up some mating plugs with miniature banana plugs.

Here's an older photo of my mock B-26 radio shelves with an SCR-274N setup:

Image

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If it ain't broke, take it apart and see how it works.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 1:38 pm 
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Joined: Oct Thu 08, 2020 4:31 pm
Posts: 16
Took a look around earlier, found a couple of extras.


Attachments:
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File comment: 2nd dynamotor
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File comment: Owners guide
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File comment: Found this schematic inside the manual
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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Thu 29, 2020 11:04 pm 
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Joined: Oct Thu 08, 2020 4:31 pm
Posts: 16
Thank you for all the great info.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 5:23 am 
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I "run" sort of an ARC-5 Orphanage of sorts. My current crop of transmitters and receivers, is comprised of beat up "High Mileage" examples, and I chose them that way so I didn't have to fret about making changes as I saw fit. I also used ARC-5s along with a BC348, which I still have, in the 70s, on CW.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 3:00 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Warner Robins, GA
I have a BC-455A receiver that was modified by a previous owner in an irreversible way (hole where dynamotor mount was, rear connector removed, AA5 audio output transformer installed & front connector replaced by plate with switch volume control and headphone jack) so I modded it to suit my needs. It runs on an external 250Vdc supply and the power supply also has a push pull 6BQ5 amp on it. I at one point stupidly removed the BFO several years ago. Also added a signal strength indicator driven by two transistors off the +12.6Vdc heater line. The 12A6 was removed due to using the external amplifier. I also added AGC which was as simple as taking a 2.2meg resistor and connecting it between the junction of L11 and the 510K resistor and the junction of L9 and C15A and removed the stock gain control and just grounded that point.

I replaced all the previously replaced capacitors, replaced all resistors as many were out of tolerance and put the original 7K screen grid voltage divider circuit back as said owner had just used a single resistor. I then aligned it.

Works great now. AGC works really well.

I can provide detailed info on the AGC mod if necessary.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 4:00 pm 
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Some of those receivers did have AVC; I think that it was the Navy R series. Those are great little radios, and there were a lot of articles written about them.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 4:03 pm 
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Yes the Navy ones did.

The BC ones had the circuitry there but didn't have the resistor that would complete the circuit by supplying the - voltage from the detector to the circuit.

I auppose that was so reception of SSB would be better as I've often heard best SSB can be had by switching a receiver to manual gain control and turning the audio gain full then using the RF gain to vary the volume.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 8:45 pm 
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Location: Montreal, Quebec
There wasn't SSB in WWII. It existed, but not much use of it until the fifties.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Oct Fri 30, 2020 8:58 pm 
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I meant morse code.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Nov Tue 10, 2020 7:08 am 
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I was curious about these numbers on the back of the receiver & transmitter. As well as the connections between the modulator/receiver/transmitter. How & where the dynamotor plugs into the 455 & does the 456 also have it's own dynamotor modulator? I have two dynamotor's.


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Nov Tue 10, 2020 12:18 pm 
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Quote:
...I was curious about these numbers on the back of the receiver & transmitter...
In what way? Most are pretty self explanatory.

Quote:
... As well as the connections between the modulator/receiver/transmitter. How & where the dynamotor plugs into the 455 & does the 456 also have it's own dynamotor modulator? I have two dynamotor's...
It appears as though you haven't done any basic research yet. A simple Google search will quickly turn up the answers, and enough documentation/sources to keep you busy for weeks if not months.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Nov Wed 11, 2020 3:38 am 
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The dynamotors sit on the four little shockmounts, and plug down onto the connectors. There are little slides on each mount to lock them into place.

The mating connectors were part of the racks. It's a very long shot, but Fair Radio might still have some.

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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Nov Wed 11, 2020 11:51 am 
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The numbers on the back. What information can be derived from knowing this number? contractor's number? Who were the various contractors? Is that a reference to different Western Electric facilities? Can I possibly figure out where this was used and who was transmitting with it? Maybe through the serial number? Or what type of significant info might the serial number provide? How many missions complete can I give it credit for? I'm hoping that it means more than this is just the 4,342nd unit to come out of production. Actually Mr. Harrison this is one of my ways In which I conduct my research. The platform provided to/for us here through these forums is amazing. Reading and observing is one avenue of study, communicating is another. The ability to open a topic and get input from those experienced and more knowledgeable, is or can be so much more informative and such a timesaver. By the way I considered looking through your smugmug gallery basic research. Forgive me my curiosity gets the better of me sometimes. I spread myself too thin. I have so many different things I'm trying to learn about I just can't take the time to completely learn everything about one thing before I move on to the next. Let's take now for example. I'd like to know everything there is to know about
1) This command set
2) The Philco 15x
3)Model 80-1 Webster Chicago
4) Bell Sound Systems 3750-B
5)Model 2110 Webcor (basically the same as Webster)
6)TC-2, W-4 & WA-P2
7) Hammond solovox tone cabinet
8)I've been dedicating most of my studies so far starting to understand the basic tube composition in order to identify, catalog and organize these 100 tubes in lm looking at. 9) Plus I'm curious as to why these 6 tubes out of a couple hundred were special enough to be individually labeled by the previous owner
My topics aren't just for me. I enjoy sharing as much as learning. The enthusiasm is inspiring. The first word, in the first response, to my first post was "Wow" I'm grateful to know a community like ours can provide so much. "Google it” goes against what we are all doing here. That could be the answer to anyone's new topic post how fun that would be., Thanks Tim when I get a chance I'm going to rest that dm on those mounts. In the center of those mounts is a connector. I just couldn't Invision how while placed there the dm would have room for the connector under it. The 456 looks like those mounts are further apart from each other and no I didn't Google to see if there's such a thing as a bigger dm. I didn't see a forum title clueless. If I did I might post in it. Shamefully slightly. Yet proudly as well. As bad as I may feel for not knowing someone else can enjoy the opposite jubilant satisfaction created by giving a helpful reply. I really like your radio shelf/cabinet. I meant does the 456 modulator have it's own dynamotor? Not it's own dynamotor modulator?


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 Post subject: Re: Puzzled with pieces 22/ARC 5
PostPosted: Nov Wed 11, 2020 2:31 pm 
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Posts: 904
Location: Sullivan, MO
The transmitters and receivers plugged into mounting racks that had a mating connector. These racks came in single, double, triple, and even quadruple bay units. The receiver and transmitter racks were different from each other so receivers would be in one rack and transmitters in another. These racks then snapped into shock mounts that were riveted to the aircraft. The modulator and antenna relay snapped into shock mounts as well. The modulator, antenna relay, control boxes, receiver rack, and transmitter rack were connected together via multi-pin circular connectors.

The receivers were remotely tuned by a "coffee grinder" crank on the receiver control box. A Bowden (or speedometer type) cable is used to connect the control to the receiver for the tuning. The transmitters were set to a frequency then locked. Keying and selection of the transmitters was accomplished with a small control box. Typically these control boxes were located in the cockpit for the pilot to use as these were mainly for plane-to-plane or short range communication.

The BC-456 would use a DM-33 dynamotor that supplies 575VDC. It is a larger dynamotor, almost twice the size of the one you have (which should be labeled on the bottom of the mounting plate as DM-32, DY-2/ARR-2, CBY-21531, or CCT-21531).

The contract number won't really tell a whole lot, unless you have access to Western Electric company records from that time. The SC on both units probably indicates they were actually built by Stromberg Carlson. I know they built a number of the ARA/ATA and ARC-5 components. The CCT on the transmitter nameplate is the manufacturer code for Stromberg Carlson. If you find something with CBY on it that was Aircraft Radio Corporation who actually designed the system.

With these being Navy units they would have been destined for Navy aircraft. Whether they were actually installed in an aircraft and what specific aircraft would be nearly impossible to find out. There were many of these units built that were sold surplus after the war still in factory sealed boxes having never been used. Every once in a while one will still show up for sale. About the only way you would be able to find out if it was installed in an aircraft is if someone had made a note somewhere on the unit with an aircraft number. I have a couple pieces of AAF equipment and manuals where someone had written the serial number of the aircraft to which the item belonged. That serial number can be looked up and some of the history of that aircraft can be gleaned.

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Sean
WØKPX

If it ain't broke, take it apart and see how it works.


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