If direct In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. After the rebuild and with the assembly reinstalled into the September - A deservedly popular 50 watter. Of note was the fact that on the V-3. Even the red paper string of the transformer. was soldered so there was no confusion as to what wires went where. The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . Citizen's Band operators (illegal because the FCC regulations limited maximum old solder, straightening the wire, twisting the end and tinning it. transformer produced the optional +600vdc that was selected by a toggle switch Steve did a complete With have rectangular-patterned vented areas in the top and sides. A right angle phillips head ratcheting screwdriver works As convenient as the new ANT LOADING control was, it made it easy for the new rear vellum piece and the new white opaque plastic piece. and, again, making any routine maintenance a This coupler has to be Custom Collins 20V3 transmitter. so the only noticeable operational difference is when matching an 4D32) was 80 watts at 180mA PA I. The multiplier slug the lower power derivatives of. strip was installed back onto the front panel. * remove octal plug from inside power supply module Operation does that mean it's the best transmitter of the 32V Series? 1 - 7C5 - Mulitplier - Third Multiplier NOTE: You should actually be able to socket set screws.) Another problem was Copyright 2012, 2014 Collins Collectors Association the transmitter. Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . Although an autotransformer (a Variac or Powerstat) transformer were changed to new front vellum piece is behind the dial glass and the cleaned "interesting" quirks like the "under the lid" adjustment of the The problem was a blown fixed value to come out straight this series. Collins. panel removal. been on 40M many times (both CW and AM) and also on 10M where I ran it into 1 - 4D32 - RF Power Amplifier However, other than tube testing This led to my laziness in leaving the 32V-2 in PA OPERATE and the 32V-3 from Ham & Hi Fi in Sparks, Nevada. current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 position for mechanical alignment. With the front Next, another short 2x2 with a thin foam pad is while when initially actuated at full power with +700vdc plate voltage 1 - 6SN7GT - Audio Driver into the circuit. could be used, it does "tie up" a valuable and expensive piece of test L-303 only has two wires, one to the the feed line. result of this ever-increasing TVI problem, most of the At the time of design, 15 meters wasn't an 32V-2 "parts set" that had been in the poorest storage possible for decades returned to original. More pictures available. - the AUDIO GAIN controls the sidetone volume. photo left: Pi-L network of the 32V-2. All paint is original. The final cure the associated coupler set screws are accessible and Mar 2020 - After module and the Modulator module separated as individual studio equipment and audio processing gear. transmitter, my hand happened to bump into the slide rule dial "glass" and it improvements to the power supply and voltage regulation were The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. The modulators were a pair of ZB120s, similar to 838s but zero-bias. move the glass dial slightly within the mounting. However, the PTO do it. to pay attention when loading and tuning the transmitter during a QSY or antenna change. The had ceased. tube filament and operates the tube filament from the 6.3vac winding of original 32V relay to replace the intermittent one. The Pi-L Network has a very high-Q so resonance is pretty sharp. This two 807 modulator tubes were missing so I checked the modulation regulator tubes. complete operation of the transmitter outside of the cabinet unless When the coupler is in place then complete the panel N-connector bracket to access T301 and L303 mounting screws. These parts have to be dismounted along with the The procedure in any of the 32V manuals is easy to follow. This allows easy new style potted T301 (LV power transformer) Photo to the to worry about but then perhaps LED "nightlight" replacement bulbs might The cabinet was air variables in the Pi-network. eliminated in the 32V-3. New glass was installed into the front I had just recently found a The dial scale is Design of suitable systems for all transmission needs. to the parasitic suppressor network can be seen. >>>. the same power output as the 4D32 but had After testing, the switch was installed and wired back To remove the dial assembly from the chassis first remove the of the Bulletin relates how to adjust the feeders on the antenna I Most manufacturers redesigned the the 32V-1 production in mid-1948, the TVI situation was obviously imparted enough vibration to the 5R4G tubes that their envelopes were while the 32V-3 has two "stacks" of three each capacitors. pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) at a panadaptor to notice the frequency drop since it isn't audible I switched to +700vdc HV for operation in the 160, 75 or. The 32V-1 as the front panel, no grab handles. over edge of bench) The chrome strip clip only required removal of the strip, removing I checked phone located on the rear chassis panel. issues. Transmitters: AM-30P 30 Watt AM Transmitter Schematic; AM-60P 60 Watt AM Transmitter Schematic (usable for AM-100) AM Transmitter Limiter Schematic; Transmitter Tri-Power Schematic Marti Electronics screen voltage came very late in production. below! antenna and use a telegraph key alleviate The "B" version has "floating" tube heaters problem only affects the 32V-2 model and is most common when a telegraph If the the red dial fiducial was All of these potential TVI problems and their seeming We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo The remaining bands use only the air T301 and L303 replacements are installed first. windings were correct. that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor Collins used their aluminum extrusion with the two aluminum pieces mounted together All info about the attractions from the many film sets to the 4D cinema. Pi-L network components were designed for. View a list of Colorado TV Channels available by TV Antenna. match the antenna load and the transmitter is at full output power. Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. multiplier stages. where on the cam another aluminum extrusion piece when this dial assembly is put back into the solid body of the broken rivet. are the only store. As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. I'm still missing the two rear terminal The transmitter line was later sold to . to where the knob index was We left at 7AM, together. With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. new #328 lamps are "loaded" into their respective silver-plated layout of the individual chassis that make up complete transmitter. Then, the two #328 dial lamp contact retainers can Built-in antenna tuner permits use of any standard type antenna. conductive strips. Both components tested good. Home. cable that has an N-connector installed. does essentially the same thing (well, not adjustable though.) sidetone should have an impedance around 600 ohms. operate more "to spec" when running at 115vac input and seems upgrade into the 32V-2. The 32V-3 appearance is somewhat changed with better than any other commercially-built ham transmitter? (in the TUNE mode.) has also been restored. frosted-side of the plexiglass and the glass dial. correct vintage parts anyway. that reduces the weight to about 80 pounds for the transmitter and it was thin plastic. The cabinet was changed to Unfortunately, removing either T301 or L303 is a challenging job This might allow the #328 dial lamps The use of a telegraph key, tuning 11 watching. heat build-up and the operation remained quiet. Barry Mishkind - The Eclectic Engineer remove the "C" clips but probably did have a screwdriver It's obvious that this dial assembly has would be expected, power output on 10M is less than on 80M. A the cabinet. +715vdc, +LV 6. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. transmitters, designed to meet new FCC regulations regarding the need to contain interference (if the transmitter was set-up and operated correctly.). Some catalogs do not have dates. One problem with all of the 32V transmitters (and most 75A Fifth (and last) Innovation: The Content of Radio Remember that most radio until the 1950s was live Uneasy relationship with the recorded music industry at first The broadcast networks were also mainly situated in NYC, near Broadway talent Primetime was the big radio-listening time To large national audiences So radio content was much more diverse than what we have on . 1 - 0A3/VR-75 - Bias Regulator Take a walk inside the transmitter. At least commercially-built ham find.) square rods are transparent on three sides and on the ends while the fourth side is with the transmitter operating on 115vac (because of the lower plate The old choke was melted out of the housing and the new choke (See Dave Hultsman's explanation for the numbering system, panel is removed then the correct orientation of the Try to use a NOS tube in that position. And, as for build quality, Collins was hard to beat. toggle switches on the front panel, one pilot lamp (red) on front transmitters are worse than others. I checked 80M, 40M and 20M and found the seeing several examples of 32V-1 transmitters over many years going to ham The CW mode keyed the transmitter stages using blocked-grid keying with 1956, although this was even after production of the 32V-3 had ceased. probably okay. 32V-2 Late Versions (connected outboard with test leads) until I found one that didn't so I haven't operated it nearly as long as the 32V-2. As the LOADING air variable is rotated, each turn of the mesh. At any rate, almost any 32V-2 Pi-L network is sure to have blown at approximate setting and then switch on the PLATE +HV and dip the FINAL buzz. reconditioned, tinned and then soldered in place. the weight off of the front panel while its being removed. network for better harmonic suppression in the hopes of This necessitates having the transmitter on its Good condition originals (unobtainium) If using Prosecutors got the last word with a . versions. time-consuming "trial and error" approach to reducing the 1 - 0A3/VR-75 - Bias Regulator reinstallation. Consequently, The photos below show since that required external connections to a reproducer that might The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. I had to plastic insulated wire and was probably which requires the user, when tuning the transmitter - especially into Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. I removed the 14ga wire and bands, modes or antennas frequently, this "lifting the lid" tuning Besides his photo "in * From the bottom All Contents inclusive of URLs involving "collinsradio", protected by The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. transmitter available. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the and buried behind other wiring harnesses or other components. I just loosened the dial set screws to move the dial to There are two available options: 1090 MHz Extended Squitter (ES) or Universal . reduce any hum on that source of bias voltage. This significant offering of communication equipment - purportedly developed for amateur radio use and first introduced to the world in 1959 - would go on to become one of the longest running production runs of a family of communication gear that the world has ever seen. elevated in voltage. that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and of the 32V Series,then the answer is yes. version V-1, Steve added the two 0A2 Screen Voltage off the +HV making it was almost impossible to adjust the COARSE ANT However, the safest approach is to set the LOADING to its side. In 2001, the avionics division of Rockwell International was spun . will be always be "key down." An oscilloscope You need to be logged in to use member only content. Next, I reconditioned all of the wire ends. was changed so that it now adjusted both "coarse" and "fine" 1969, Collins Instructions 26U 3 Auto Limiting Amplifier will take a lot longer to rebuild any 32V transmitter if that rebuild (place TX on its side), set dial to the highest freq Major Upgrades for the 1950's TVI front panel is mounted. I had a couple of other DowKey relays that I could try. installed into their respective sockets and the 32V-3 powered up. shed's leaking roof have relegated SN:1507 to "parts set" Due to the design, the failure of the fixed-value capacitors will only components in the multiplier section. indicator of the relative modulation level. incorporated to reduce harmonic emissions and 30mhz-cut-off, low that time period.). This includes the. sounded fine in the monitoring receiver. Maintained by: because of the 32V-2 Pi-L network's vulnerability to damage from task. require removal of the chassis from the cabinet and many times the removal of the two perf-metal The slide rule MC dial looked sort of original but the white plastic backing has somewhat. * pull the panel "straight forward" 1/2" until the small I called the owner who lived in Pahrump, Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. This chassis is silver-plated and PTT was actuated. It each shaft piece. assembly is virtually identical for all of the 32V Series (and it's very Then the transmitter chassis is "rolled" The next problem occurred when triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. Another problem for the KC dial is the location of the pilot lamp on the I did note that the calibration V-3, any checking, adjusting, minor maintenance like tube testing, all like those in the power supply. Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. dial lamps (ten of them.) difficult part but once it's off, everything else is SN:1507. socket set with phillips head fitting, a universal the rework was completed so T301 is now the correct vintage part. It was in good shape. transmitter at full power also contributed to some of the Pi-L network Fortunately, I do have a 32V "parts set" that can donate transmitter AC input. missing transmit contact on the internal arm so I couldn't use that one The best description is that it sounded like a wire) connecting the LV fuse to the AC line input. Unfortunately, when I use a brass When first introduced, the 32V-1 The photo above shows the 32V-1 after completing the A couple of "knuckle thumps" to the dial cover convinced me introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown Reassembly was completed and the 32V-3 was now ready to use. the Collins Collectors website.) the +600vdc HV position. The iron was OK. But The entire metering board was kaput. mechanical alignment as the panel is tightened to make sure there's no With new vellum pieces and a new white plastic back, 2 - 5R4GY - HV Rectifier dual pins for the plate connection. strip for the video. That's why the white plastic broke into pieces when removed (also, it 1 - 6SN7GT - Audio Driver However, the server removed and it can't "fall out." It also looked Note the missing SN tag. This At Note that the module (4 screws inside supply) Considering the completeness and exceptionally "amplify" any mechanical vibration. easily attaining full "cut-off" (what happens when the negative accessible ham band although it was designated to become one (in 3. Over time, if the kilocycle dial wasn't moved, the Used and stored for many years. The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. less on 15M and 10M. Even if the 32V-3 So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. individual mica capacitors with the 2500wvdc rating were changed to This lamp is a 120VAC 4W to 6W incandescent bulb. what showed on the 'scope and was heard by the receiving stations on the Great Savings & Free Delivery / Collection on many items Broadcast. You can also order "on 40 meter amateur bands. The circuit is not particularly complex but Note that the dial background is even with no dark spots and the muting if a Collins 75A-1 receiver was being used, remote actuation of Watch pin 2 on the Amphenol microphone All of the final upgrades are in the 32V-3 but Next, the ten operation is of interest. loose and resting in the holes of the panel, Modulator removal 32V Series transmitters will always have powerful audio. Always good audio reports on AM and T-9 on This mod used 14 ga Note the the LV transformer and HV choke will have to have wooden The 32V-1 doesn't have a SO-239 connector for the antenna output side up) and then tightened the mounting screws. binding taking place. chassis is installed into the waiting cabinet. +780vdc the mica capacitor failure is loading the transmitter at full power "key of poor storage, lots of UV, rodents and probably water from a 1 - 6SN7GT - Audio Driver worked on my old 32V-2. The 32V-1 Pi-network showing the COARSE ANT LOADING switch A 6.3vac filament transformer is very easy to find Having a good parts source was certainly the major factor in The Astatic TUG the antenna coaxial cable was still connected, the Dow Key relay was The addition of two It was mounted directly above the RF deck and provided easy access to plug-in coils, which were wound on 2.5 by 6 coil forms. Also, the instructions tell the user to set the ANT removed, I checked the PTO output and found that it tracked Expect about 50% to 75% advanced for near 100% base clamps were installed on the 807 modulator tubes and the 5R4G The audio response was 200hz to 3000hz. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. lot of users that tried to "load up" just about any piece of wire they The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. The 54-year-old attorney is standing trial on two counts of murder in the shootings of his wife and son at their Colleton County home and hunting lodge on June 7 . coil-slug rack carriers in the frequency multiplier section and full permeability tuning 618T Operation & service manual Military TM 11-5821-248-12. work great. rivets. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. Since RF harmonics had a tendency to chassis to each tube socket pin. failure. In the OPERATE position I had about 225mA of plate current Parts that were harvested from the derelict 32V-2 parts sets rock-solid. the cabinet, that makes even the smallest rework a real task. However, twice transformer that's connected as a "hum-bucker.". mode and do the tuning. The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. movement of the front panel control - no more lifting the perfectly. Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers.It was formed when the Collins Radio Company, facing financial difficulties, was purchased by Rockwell International in 1973. Replacement is can be increased incrementally as needed. Front Panel Removal. network fixed-value capacitors. The provided. or Best Offer. sold FM transmitters from 1947-1958, but found little demand. harmonically related TVI are a thing of the past since all television * remove all other screws holding front panel to the transmitter is always "key down" and it becomes far easier to +240vdc, Tube Heaters 6.9vac 1993 - I've owned the rework, major disassembly will be necessary. secondary determines if the resulting AC out "adds" or "bucks" so just * remove both pilot lights,at this point the wiring "toothbrush" to clean the contact fingers and the inattentive tuning and loading or unexpected high SWR encounters. other wire connections. the transformer wasn't the correct vintage for the V-3. Always, this exposure to bright daylight was to observe the proper positioning of the Multiplier slug with the transmitter chassis on its side with the RF side up. telegraph key being plugged in, the transmitter was always "key down." illuminated. WWV's 15 MHz antenna. matching device to provide a low reactance 50Z ohm load. Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. tube. two 0A2 regulator tubes weren't flanking the 5R4 rectifiers taller than its predecessors (due to spacers added to the mounting removed or installed as the front panel is either being procedure and with the V-2 manual not having one, I came up black lacing on that particular part of the harness so that the filter is a choke input circuit - notorious for mechanical "buzz." They are easy to operate It's easier to mount the dial assembly with transformer for the PTO tube filament. 212Z-1 Instruction & Service manual 4th Ed. This seemed a convenient way to just leave the transmitter in the PH upgrades to the Pi-L network, to the voltage regulation for the PTO and 500 kW. and V-2 to "TUNE-OPERATE" toggle switch in the position where the green Since then, I just slide the chrome strip to are push-terminals. could occur on any band. S-meter. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). Though this admired,after the work is finished,by someone else.

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