The basic wireless invention went through a rapid evolution between the first and second World Wars. Miraculously it came to life when powered. Transmitters utilize a MOPA (Master Oscillator Power Amplifier) architecture supporting AM phone and CW (aka Morse code) transmission. Tower up to 50 m. Transmission power 0.4 Watts. Just one thing about caps: ESR is not Electrostatic Resistance, its the Equivalent Series Resistance, Excellent posting and thanks for the dynamotor rebuild info. During night time contacts the lower frequency crystals should be used. Given the changes to the tuning unit I realized that I had to do a full alignment. I have a BC-348/Q5er (BC453 w/ front-end mods to tune to the 915 KHz I.F. Isnt ESR short for Equivalent Series Resistance? On August 9th the contract (No y-3550) was approved and the Contractors began work. endobj I opted to re-stuff the defective caps by opening the metal cans, extracting the guts, and putting in a modern replacement, then gluing the cans back together. The table itself is located in Section 2.106 (this link is for informational . Fug 1: Also known as Torn.E.b And Pack Receiver b. I was one of the youngsters who got an ARC-5 receiver in the mid 50s. I think its laudable that he kept the mods and replacements to a minimum. I followed the instructions from the original service manual, aligning the IF first (using a modern synthesized signal generator to get it spot-on), then the front-end variable cap assembly that I had just repaired. It is a carefully balanced chassis/radio design for weight minimization (these were installed in aircraft after all) while also remaining rugged and able to provide stable operation across MIL-SPEC temperature ranges and intense vibration. The later was tricky, with some high, medium, and low-band-specific alignments required. I did make one modification to it: I added a pot to dial in some positive feedback around 2 of the IF stages. John in Texas. No replacement of any components whatsoever. This test will show if a cap is functioning as a cap and as specified. Operating on the 2000 - 2100MHz band. endobj Operating on the 1250 - 1390MHz band, two channels. I use that although I have read on the ARC5 collector pages these radios will perform with voltages as Most radios need every paper capacitor replacing, otherwise the leakage in them just destroys the resistor droppers, or blows up something else. Officially the only people who were allowed to listen to foreign broadcasts were the SS and Abwehr (army intelligence) for intelligence purposes and members of the Nazi Party who were given special permission to use more powerful radios to listen out for and disown Allied propaganda. The original contractors were Turner Construction Company of New York, the Raymond Pile Company of New York, and the Hawaiian Dredging Company. Free shipping for many products! The 1940s also came to be known as the Age of Golden Programming for radio shows. It was first used in combat early in 1944 on the Anzio beachhead in Italy. Lastly, contracts should be paid a fixed fee instead of the conventional percentage of cost because it does not benefit the contractor to spend money but instead rewards him for not spending money (Woodbury, 1946:59). 29 0 obj It was used by armoured observation posts. If run out of trim, I might do a little naughty and just strap a little booster cap across it. Used by anti-tank units. The station was commissioned on December 21, 1941, and grew to be one of the largest Naval radio stations in the world at that time (Allen, 1950: 226). Whrrrrrrrrrrr.. After about 30 seconds the Whrrr sounded slightly bogged down, loaded down actually, by the vacuum tubes warming up and drawing current from the 250VDC output of the dynamotor. Now there are so many easily modifiable kits and open source designs the remaining historical items are better off as museum pieces. By the end of the war, the Hellcat had a 19:1 kill ratio over Japanese aircraft. From 1936 the German forces started deploying a range of communication links using UHF frequencies to form a point-to-point mesh communication network. It wont be factory original but will represent the era. With such a receiver the young ham would be able to tune in radio traffic from all over the world and practice listening to Morse code (CW) transmissions. It operated in the 23,000 to 24,950kHz (23-24.95MHz) frequency range. Unfortunately, I did modify the chassis to accommodate some kind of tuning knob and vernier in an attempt to slow down the tuning rate for cw. FuG 8: A medium-wave transceiver (receiver/transmitter) used in command tanks. Air to ground radio communication equipment. Octal tubes were used as the active devices and the operational frequencies did not exceed 20 MHz, which was considered a high frequency for the mid 1930s. The receiver was not too sensitive, and tuning was jammed up at the higher frequency ranges on the dial. I found mine at the Dayton Hamvention many years ago for $10. There is a Museum ships radio contest once per year, ships will operate CW and AM with the old gear and plug in a modern transceiver to operate SSB. When they did not have enough time to gain altitude they had catastrophic losses. 5 0 obj Nice! And yes, Ive restored many WWII radios, and the peanut gallery is always annoying. The one-way voice link (OWVL) described a covert communications system that transmitted messages to an agent's unmodified shortwave radio using the high-frequency shortwave bands between 3 and 30 . Fug 21: A 0.1 - 10MHz receiver paired with a 2.5 - 7.5MHz transmitter. endobj FuG 16: A HF transceiver (receiver/transmitter) used in the command vehicles of Sturmartillerie units. WWII WW2 BC 611 HANDIE WALKIE TALKIE US Army Radio Reciever Top plate $79.99 $11.99 shipping Pre-WW2 US Army Military Signal Corps Field Phone Radio Telephone Type EE-3-B $429.99 $42.00 shipping or Best Offer Vintage WWII Army Signal Corps BC-603-D Field Radio Receiver Western Electric $199.99 $53.79 shipping Range 5km AM voice.[1]. Very nice restoration! I measured <1 uV on AM at 2 MHz, more than good enough for me and easily exceeding the original factory spec. endobj By Ernie Smith Aug 17, 2017 Filed under: cell phones, kiddie talkie, , push-to-talk, radio technology, two-way radio, walkie talkie, wireless spectrum, world war ii Operating on the 475 - 525MHz band, two channels. I love seeing the WWII equipment properly restored. In some command units. endobj I have been binge watching WWII movies lately and it got me wondering about what kind of radio frequencies where they broadcasting on back then. Over one hundred firms applied to be the Contractors used for the Pacific Naval Bases. It operated in the 23,000 to 24,950 kHz (23-24.95 MHz) frequency range with a transmission power of 10 Watts. Now that everything was in order it was time to try the radio in its final configuration. Goebbels also used radio broadcasts to spread the word of Nazism abroad. I did have a BC-348 at one time, when I was in college and that was my receiver for the station I took to school paired with a home made CW transmitter using a 6L6 on 80 and 40 meters. (Episodes of Nazi-fascist violence) As much as Ive read about Dynamotors, Ive never seen on in action. I found a video on servicing a similar motorand proceeded to strip mine down, clean out the old grease in the bearings, put new grease into the bearings, clean the armatures, and re-assemble. Mast or tower. Dynamotor worked perfectly, just like new again! The GEE MkII was the main navigation system used throughout WW2 in Europe. Depends on the service. They're all over the place. After the war the codes were declassified and Ka band and millimeter (mm) were added. .15 Watt output AM voice and CW. Panzergrenadier units. 69 0 obj Thats a good suggestion and ive never thought of it before. After Coral Sea it was immediately concluded that a Wildcat dog fighting a Zero was suicide. endobj Replacement for Torn.Fu.f. I have a Book Scanner that can do bound books. One of the forerunners for this technology was the revolutionary electrical musical instrument developed by Leon Theremin. To check for value and leakage with one test device you must resurrect an old piece of test gear known as the capacitor checker. 56 0 obj The SCR-584 operated in the frequency range from 2.7 to 2.9 GHz (known as the S band) and had a parabolic reflector antenna with a diameter of nearly 6.6 feet (2 metres). And at the other end, the magnetron was developed allowing high power microwaves, mostly for radar. That connector full of separate banana jacks is just screaming for a 3D printed jig to hold them all together. FuSpr.a: A mid-band HF transceiver. Clandestine Radios of WWII - EEWeb Community Still others operated radio frequency heaters and sealers being used in an expanding number of industries using technology developed during World War II. In the hearings of 1939 were stated several points that convinced skeptics of the decision to use this system of CPNAB. I saw one for sale in an antique shop in Amsterdam once. Used by artillery forward observers. Feldfu b: 90-110MHz Used by the infantry used in two versions. I know ATA ferry pilots had no radio, even on repaired planes, and was wondering how that was accomplished. The FuG 2 was never used on its own but as an additional receiver in command tanks and relay devices. The time station is WWV on 2.5 MHz exactly. For high voltage capacitors, the key metric of goodness is leakage. I dont know if they finally all sold out, or everything just got sent for scrap when Soviet surplus and post Soviet cheap optics and gear filled out the surplus pages during the 90s. FuG 9: A transceiver, operated in the 0.1 - 7.1MHz (100kHz - 7100kHz) range. endobj 1 0 obj https://mapsairmuseum.org/what-constitutes-a-radio-on-a-wwii-era-bomber/#:~:text=The%20predominate%20command%20installation%20during,5%20command%20series%20was%20used. I tweaked the antenna coupling control, they were louder still. That radio has an acceptance stencil from Alameda Naval Air Station It was usually used with a 1.4 metre antenna. endobj I wish I still had it, but the car it was in was stolen from me, and when I got the car back, the radio was no longer in it. Your painstaking dedication to detail and historical accuracy means that the next caretaker of this radio will still have plenty of historical context surrounding each of the individual parts, construction, etc. 1 Watt output AM voice and CW. Dynamotors are motor-generators; in my case one end is a spinning motor at 28VDC motor and the other end is a 250VDC generator. Fug 25: A 2.5 - 27.5MHz receiver paired with a 3 - 16.6MHz transmitter. 72 0 obj These radios were designed in the mid 1930s. I hooked up my 20m dipole and to my amazement I was tuning in AM broadcast stations at around 1500 Kc. 84 0 obj Sadly this is no longer the case. These things are built like tanks! 25 0 obj Naturally their foray into military-technology innovation affects the way defense satellites are designed in the next half-century. . In the 1920's and 1930's the Russians developed a number of radio-controlled systems. Working towards the same goal, they slowly and stubbornly inched towards a proposal for Pacific Naval Bases (Woodbury, 1946: 65). NSS Radio Washington 4045, 8090, 12135, 16180Kc From other side of same card: NPG 7065, 14150 NPMH 8230, 4115, 12345,16460 From another card: NPG 7065, 14150 NPNG 4160, 8320, 12375 VLF Frequencies from RBA-1 NSS F 18.6kc (Arlington) NAA F 15.5kc NSS B 122kc NBA F 32.6 (Panama) NBL 450kc From NAVPERS 10172, Introduction to Radio Equipment I tested the electrolytic and paper caps with a Fluke DVM in resistance mode for obvious shorts or low impedance. A cable linked the two men together. Ideally, capacitors should present no resistance whatsoever, but practical capacitors do present some low resistance and bad capacitors present a lot more than some resistance. Workers hiked up the back side of the cliffs, from the Red Hill side, soon after the attack on Pearl Harbor. endobj (BBC Signal and Sunspots) Power output: 40 to 70 watts on CW and 10 to 17.5 Watts on speech or MCW Otherwise identical to Torn.Fu.b. The problem with these crystals was, that frequencies of the radio nets were planned frequencies for day and night time, just for all the 24 hour. If a capacitor failed, then it must be re-stuffed. It is not easy hooking-up military surplus radios because they typically use multi-pin multi-use connectors for power and other controls. At one time (1976) I had it mounted in my 65 Datsun (named Ziggy), and used to work CW on 40 meters with headphones on and a key strapped to my leg. The basic wireless invention went through a rapid evolution between the first and second World Wars. The F4F is often underrated today because its performance numbers look so bad on paper but it had a very good kill ratio and it was the main US fighter at Midway. The b version was used by the infantry until they changed to the 'c' model radio in another band. 0.6 Watt output AM voice. endobj .15 Watt-output AM voice and CW. This wasnt restoration though, it was trying to get the last few cents worth of service out of ancient crap for as little additional investment possible. Test those capacitors before throwing them in the garbage and keep those filaments lit! The Admiral proposed: . Replacement for Torn.Fu.g.[3]. Those old caps still working is amazing, and a testament to just how terrible the knockoff electrolytic caps are. For example, according to the ARRL Ham net's directory, there's a Bartlesville, Oklahoma rag chew net that operates on 444.775 MHz on Wednesdays at 8:30 pm. Feldfu h: 23.1 - 28.0MHz Assault Guns and Sturmartillerie. 16 0 obj Additional information about the FCC's table of frequency allocation is available in the Commission's rules. There seemed to b warehouses full of them up into the 80s along with a lot of other WWII stuff still around. Yes, the rolled paper/wax seem to hold up forever unless electrically or physically abused. I even used the receiver as a tunable IF in a science fair project experimenting with mixers/converter for 10mhz WWV. https://mapsairmuseum.org/what-constitutes-a-radio-on-a-wwii-era-bomber/#:~:text=The%20predominate%20command%20installation%20during,5%20command%20series%20was%20used. Long range radio systems to communicate back to base, typically consisting of an ART-13 transmitter and a BC-348 receiver. endobj The "Backpack" or Torn series and the field or Feld series. 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