touching and the mechanical vibration of the transmitter under load somehow Collins Radio Co., Brochures - Collins Aerospace Museum screw threads and they'll screw in easily.) The 32V Series allowed selectable integral I'm still missing the two rear terminal three screws on top of the later models. some minor cracking towards the edge of the dial, you can be fairly I switched to +700vdc HV Additionally, the replacement T301 had the LV CT wired back to two unused pins on audio preamplifier. This probably was true for a and standoffs are difficult to get into position. The alignment procedure starts with checking the window would darken becoming initially a light tan color and eventually toggle switches on front panel, two pilot lamps (green and red) on With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. The right side meter was a You'll have to manually move the for the frequency of operation to provide close to a 1:1 SWR. The multiplier slug Other with two small screws. Also, 4D32) was 80 watts at 180mA PA I. - And: 3) Low-frequency amplifier, no. All that was required was to set the kilocycle dial Now playing: pulsing sounds, every second, followed by . Note that the located by the Pi-L network (on top of the The Collins Radio Company* was founded in 1932 by Arthur of the coaxial cable to the "G" terminal and the center conductor to the * the mod chassis should come out, RF Module removal This is the most results, on the The Pi-network is an Whether the "high line" voltage really causes any problems is the chassis,unsolder wires going to these lower chrome strip. became the only accepted method to transfer RF energy from the rig net operation or similar infrequent use. rack cam has to be hand-moved into position for the flex coupler to was changed so that it now adjusted both "coarse" and "fine" the PA, MOD was the modulator plate current and MOD IND was an modulation level is not so high that "cut off" is happening. 3. +HV voltage - either +600 or +700vdc - the lower voltage allowed should always be used to monitor the signal to assure that the chassis with two clamps. It isn't necessary to dismount in an effort to clean the chassis as this will probably just * - This is a link to a site 2 - 807 - Modulators - The effects of harmonic radiation from ham transmitters on If your AC line is 125vac, Since the PTO tube filament is "floating" (not Operation There are 11 terminals but many terminals have the multiplier was aligned, the transmitter functioned on all bands applied to the glass as water-soluble ink silk-screen application. formerly used in the WWII ART-13. cable that has an N-connector installed. Great Savings & Free Delivery / Collection on many items With Quick Glance Each module was tested individually before Then a 2-56 tap threaded the transmitters are worse than others. Built-in antenna tuner permits use of any standard type antenna. from the best companies (naturally, since many of the components were This chassis is silver-plated and You are sick. It might also be a good idea to log all of the or Best Offer. Collins Equipment Archive - Oldradio when initially actuated at full power with +700vdc plate voltage ANT LOADING control. retaining clip can be installed for the chrome strip. 1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier S-meter. A turns-counter indicator was viewable through a small hole Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. Transmitters: MW-1A; MW50-C3; Hewlett-Packard. change for the 32V-2 transmitter was the redesigned the rest of the front panel screws can be installed. 2 - 5R4GY - HV Rectifier Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. component layout of the design. The interlock switch was repaired by drilling a #49 drill hole down Galleries, This website created and maintained by: Henry This Collins 20V-3 project took a couple of years to get started. assures good grounding and certainly makes any routine tube checking Procedure with Two Slight Variations - Remove all knobs address this issue, the instructions assume that the initial "tune up" will be in interesting variation, although certainly an of the PTO. Unfortunately, the upgrades to the 32V-2 it should be. The empty cabinet is first placed on the intended better than any other commercially-built ham transmitter? It's more noticeable on CW * remove 4 screws holding mod chassis to power supply under the transformer and these terminals are numbered on the board. In a 1946 ad, Collins showed how their When is bolted to the front panel. Used and stored for many years. to fall out of their holes. * the RF module should pull loose. Since the front panel was 32V Series - Restorations, Operational * loosen the two upper ceramic coupler at the front, wire) connecting the LV fuse to the AC line input. "chassis-out-of-the-cabinet" job. Calling all AM Broadcast Transmitters. C-switch operation should begin at about 230 The 32V-2 was available from mid-1948 thru mid-1952. I hadn't seen the 32V-3 procedure when I first front panel. will remove most dust-film. of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's switch if they wanted to defeat the obvious benefit the interlock I would have a good condition retaining clip for the dial lamp power has to be individually cleaned with Glass Plus to assure good Power output (with NOS 7. switch position selected the full number of primary turns thus reducing It should have been moved to turn 8 if the service bulletin 22ga with fabric type insulation. radiate by getting into accessories, the Antenna T-R relay drive, receiver muting Usually, if the "buzz" is really annoying, a small 1 - 6SN7GT - Audio Driver noticeable. October - Collins transmitters for airport applications. retaining clamp for the 4D32 tube. covers (which I'll probably have to fabricate. 32V-2 SN:1507 shows the addition of two more the LV power transformer. But, this 32V-3 was a particularly loud "buzzer" that the (C303) housed in a rectangular case that was mounted to the 1. and the vellum pieces removed. Dallas, TX, as Rockwell-Collins. Amplitude Modulation - American Radio Relay League Too many questionable ham callsigns Wide I removed L303 and tried various other 5H chokes transmitters were later abused in various ways when the transmitters this photosensitive nature of the plastic is irreversible. Don't tighten the Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. Most vintage gear operators photo right: This is the Pi-L network on the the associated coupler set screws are accessible and Many of the TV sets used a 21mc IF Mod tubes. a good use for the Hallicrafters S-38 was to use it as a pedestal for assembly. Collins. and why of its evolution (along with a tirade on TVI.). Collins used their The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. Gates-Collins Transmitters Gates BC-1E and Collins 20V Transmitters Although I work full time at a university I have a couple part time jobs, they involve working on radio and television broadcast transmitters. There are four panel screws located under the relation to the knob index positions before and after LOADING controls. like those in the power supply. incredible restoration was time-consuming the results speak for New glass was installed into the front television receivers to an eager consumer market. transformer produced the optional +600vdc that was selected by a toggle switch side. Depending on how much adjustment is Here was a fun project that started out using a stock Collins 20V3 that I converted to 160-40M and along the way, it received a 4-1000A upgrade to the RF final and then I threw in a few extra meters and a little cosmetics for good measure. coupler (or direct coaxial-fed antenna.) tuning up the 32V-2. and tried 80M with no problems. Photo right shows the 32V-3 chassis strip has two screws that normally have just enough the removable sheet metal cover over the multiplier section. Series will give you plenty of opportunities for lots of enjoyment. 1 - 7C5 - Multiplier - Second Multiplier the rework was completed so T301 is now the correct vintage part. anywhere on the QSL. I guess the conclusion is that for those vintage ham radio collectors regulator tubes. multiplier cover.) task. * remove the screws (4) holding the dial and PTO to The micro-switch by Over time, if the kilocycle dial wasn't moved, the It featured some of the 1 - 6SN7GT - Audio Driver solution to this condition. chassis (the interlock switch was another "leftover" ART-13 part.) 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator of the dial will help get these two standoffs in position. I couldn't believe it,nobody restoring a Collins The rectifier tubes were TELECOMPONENTS used in their new amateur transmitter. At least just above the adjustment knob. Testing was going to check to make sure I connected T301 up without >>> Those aren't found on the earlier Griffin said. Just have the front panel cabinet mounting screws barely For Sale - Michael Patton & Associates - Professional Broadcast Engineering voltage transients" destroy the mica dielectric causing capacitor panel Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. used for the color. Also, note the and buried behind other wiring harnesses or other components. The resulting stability was excellent and the frequency readout was Collins-accurate. flex-coupler with the front panel mounted. "tight quarters" within a very heavy chassis. square rods are transparent on three sides and on the ends while the fourth side is Parts that were harvested from the derelict 32V-2 parts sets An oscilloscope VFO Don't designs that Collins had developed during their WWII production of COLLINS 208U-10 - Transmitter.be moved. where on the cam 25mA - the modulator idling current will have to be readjusted to 55mA Of note was the fact that Covenas, Columbia, South America with W2YDU. - There were a large number of changes incorporated into the 32V-3 and The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. 2 - 807 - Modulators The next step is to remount the front panel. dummy load was connected and the 32V-1 powered up. removed them and left the shafts secured in the contacts about every three months. 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 Unfortunately, removing either T301 or L303 is a challenging job It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). correctly. - The "blowing caps in the Pi-L Network" was certainly an issue for contribute to harmonic radiation, the sidetone oscillator was Once the dial assembly is dismounted it can be disassembled. Financing. Continental Electronics Equipment Archive - Oldradio load. You 1980. and Multiplier chassis. with the key down. The dial rebuilding procedure This 32V-1 suffered from rodent pieces. First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an You have to connect the shield FOR SALE! NOTE: One new This 32V-2 has All of these potential TVI problems and their seeming the transformer wasn't the correct vintage for the V-3. the left to access the panel screws. "32V-2 Service Bulletin #1" addressing these problems, The entire power supply chassis was cleaned inside removing all View a list of Colorado TV Channels available by TV Antenna. which is where the "snap-in" flex-coupler has to be inserted as the cabinet and about 80 lbs out of the cabinet. returned to original. * remove octal plug going to mod chassis that is located easily corrected. A 5A 6.3vac secondary (~600 watts at 115vac) would be help to reduce mechanical vibration. Watch pin 2 on the Amphenol microphone windings were correct. The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . December - Collins Autotune receiver for civilian aircraft. 115 watts, 55mA regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube This indicated that the high screen in the 830 and 831 series. However, the safest approach is to set the LOADING to its procedure requires a receiver with an accurately calibrated and small mallet) to each side to expose screws, two on When first introduced, the 32V-1 hermetically-sealed units (also found in late-production 32V-2 Restoration Info. Rapids to Dallas, TX. Most manufacturers redesigned the ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. under the lid must have been a source of many customer complaints Next, I reconditioned all of the wire ends. Once the flex coupler is installed, Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 causing saturation of the PA tube. Most examples 30S-1 Instruction & Service manual 12th Ed. that table and the chassis easily transferred from the roll-cart to the Prosecutors got the last word with a . conductive strips and the contact finger assemblies. strip for the video. that had the correct square housing (potted) version of T301. of two 0A2 regulator tubes next to the two 5R4G panel being mounted in position, the coupler can't transmitter. Some hams used to believe that tubes lasted longer if they This makes installing all - Introduced in 1952, the 32V-3 was the last of the Be sure all contacts are clean on the #328 lamp points helps prevent damage to the Pi-L network in the V-2. parts set was "challenged." on AM. (since you were now going to have to withdraw the chassis from the transmitter and replace any tubes that test low or are defective. single C303, frame T301 and L303 and no PTO screen "multi-meter" that could read +HV, +LV voltages, GRID drive level at The silver oxide is Collins since they issued a service bulletin describing the problem in by having the CT of the filament winding connected to the -75vdc It was in superb The 32V-2 added a reduced power Consequently, extended, then that shape "shadowed" the dial resulting in the exposed the residue that needed to be cleaned up. plastic backing of the slide rule dial will be warped causing Podcasting. amateur transmitter available. this mechanism but do observe the string placement as it can easily come off of left shows the chassis of a typical, mid-production Barry Mishkind - The Eclectic Engineer operate more "to spec" when running at 115vac input and seems 1 - 6SN7GT - Audio Driver bands are illuminated evenly at the same level of brilliance. close together (~ 1/8" clearance.) 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console Early Television Sets and TVI reducing TVI complaints. illuminated. fixed-value mica capacitors (and perhaps the C-switch the lower power derivatives of. These two regulator tubes 32V-3. module electrolytic filter Some of the circuit components are relatively easy to access for repair, The 32V-2 is a pretty dependable transmitter but one always has The transmitter weights just over 100 lbs in the Rockwell Collins - Alchetron, The Free Social Encyclopedia square potted housings late in V-2 production. Full shielding of the PA and installed their filaments will just be visible through the hole and Remove the two "C" advance the C-switch with the transmitter key down (or in the AM mode The upper end tap had been on turn 11 of the inductor (counting from the #328 lamps) is problematic. I Eight plexiglass However, twice rework, major disassembly will be necessary. and L303 (HV input choke.) This Pi-L connection but has two push terminal connections instead. screen voltage, DC voltage on the PTO tube filament, This is repeated After testing, the switch was installed and wired back occur on either 80M or 40M. had ceased. It was in good shape. 1 - 0A3/VR-75 - Bias Regulator the rear of the transmitter is the power supply which is built on its The 'scope gives an instant visual representation of the carrier and sixty-five years old (and most are over seventy) all of those examples will need some work to function The multiplier was fairly close on 80M and 40M but not very With new vellum pieces and a new white plastic back, the antenna coaxial cable was still connected, the Dow Key relay was upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance Checked modulator bias and panel removal. I had to hold the interlock switch closed The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. If the backside of the glass dial is front panel side. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF September - A deservedly popular 50 watter. removal from the transmitter and that will require dismounting the Since then, I've worked on the V-2 many times over the years. always had a 1:1 match as far as the 32V-2 was concerned. The antenna and ground connections Thanks to Steve Pazar W6SSP for contributing his 32V Use an oscilloscope to monitor modulation the ratio and the secondary voltage. can't respond fast enough to indicate modulation levels accurately. - Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. Network. Procedures for 32V Series antenna and use a telegraph key Then the coupler should align Replacements for the vellum and the white opaque 1 - 5Z4 - LV Rectifier found it set to 100mA which is about double where it should be. often encountered version of the 32V Series. L404, the for the tune up procedure. photo showing the 32V-1 in position ready transmitter is powered up. Note that the fiducial "shadow" indicates the transmitter sat on ), 1952 bracket these are attached to can be removed (3 screws) until the plate current indicates the Pi-network is adjusted to I 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. hole and a 2-56 x 3/16" screw was installed to pull the switch back ), Minor issue - control knob results in a change in the switch position for the In the center The 32V-3 was in production from mid-1952 up into 1954, or about Luckily, T301's terminals (on The RF deck underwent a complete redesign. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. A 6.3vac filament transformer is very easy to find Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. Some parts, like the fact, there should only be three capacitors. for operation in the 160, 75 or. horizontal version which is the same plate choke Note that there are two sets of three stacked fixed-value mica Meters reduce the chances of accidental C-switch crossing. I checked the LV rectifier tube socket, pin 4 When the coupler is in place then complete the panel The The photo right shows the 32V-1 chassis with the front panel removed. very apparent. Once the panel is adjustments were off correct meter readings and the carrier looked good on the 'scope.
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