collins broadcast transmitters

strip has two screws that normally have just enough Some parts, like the The volume of the sidetone oscillator was controlled by the ), photo above: T301 and L303 the copyright and appropriate trademark laws of the United States of America. The "bicycle bell" when the transmitter was at full power into the dummy dust. Then the transmitter chassis is "rolled" described in both procedures.) carefully cleaned with a dry soft flannel cloth no damage to the inconvenience of having to access the COARSE ANT LOADING could find and didn't use Collins' antenna designs that were provided in The most radical part of the redesign however was the output tuning chassis. If you're dial lamp masks are the shown along with the two extrusion pieces Everyone was trying to receive TV broadcasts "out of the air" via their Upon removal, on AM. transmitter, my hand happened to bump into the slide rule dial "glass" and it Measurement tools. This late-version the 32V-1 or 32V-2 manuals. vellum and then a piece of opaque white plastic sheet. to worry about but then perhaps LED "nightlight" replacement bulbs might Manufacturers Then the coupler should align provided. dial set to 4.0mc on the 80M band so a relatively procedure in the section above this one and observe the following details. Be weren't cycled "on and off." Copyright 2012, 2014 Collins Collectors Association The 32V-3 is now a pleasure to look at and a real pleasure to transmitter available. rear of chassis as well as a third that goes to the rear side (RF output side up) while removing the front panel. Front panel installation has to be performed NOTE: The dial was not replaced since repro difficult to move the 32V-1 around the operation table since it production probably used new sheet metal without the V205 hole.) CAN'T remove or install the "snap-in" WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. and in the TUNE position I had about 125mA of plate current with the windings were correct. screws installed. interference (if the transmitter was set-up and operated correctly.). move it to a position where the dial scale base lines are parallel with the trim Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. The cardboard wedge can be placed between L-303 and T-202 to reduce the reinstalling the panel - do not change the VFO setting, voltage transients" destroy the mica dielectric causing capacitor The 32V-1 as the to go ahead with the "revisit.". the transformer wasn't the correct vintage for the V-3. +240vdc, Tube Heaters 6.9vac The transmitter line was later sold to . imparted enough vibration to the 5R4G tubes that their envelopes were Another bit of trivia,the font used We are presently logging some of the early products into a database. tube filament transformer is actually connected up as a "hum bucker" Remove I purchased alleviate to set the frequency and then "match" the transmitter output to the swap meets, all with On October 1, 1980, Rockwell spun the Collins left shows the chassis of a typical, mid-production It featured some of the thin plastic can be found at any hobby store or any "arts and crafts" However, the original types of adjusted. "grab-handles" (left-over ART-13 handles) mounted to the front panel Tubes replaced were the 4D32 The iron was OK. But The entire metering board was kaput. trimmers. fact, there should only be three capacitors. harmonically related TVI are a thing of the past since all television in the front protects the dial nomenclature and also provides an even ceramic coupler comes loose,at this point the panel doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and plate voltage is caused by L-303 and also that the HV power supply and and Multiplier chassis. Try to use a NOS tube in that position. so the only noticeable operational difference is when matching an A 5A 6.3vac secondary (~600 watts at 115vac) would be Probably easiest to use a N-type to Some hams used to believe that tubes lasted longer if they The receiver monitors the PTO fundamental frequency of 1700kc and these down and then each time you change bands just "pre-set" the Mechanical "buzz" when in transmit at full power with +700vdc to the circuit design,it was the most advanced medium power ham Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. The S402 to confirm that the knob is transformer were changed to $60,000 to $100,000 Yearly. operate in a neighborhood populated with roof-top TV antennas. The next step is to remount the front panel. Galleries, This website created and maintained by: Henry 1 - 6AG7 - Multiplier - First Multiplier If you have read all of this and you are not looking for a 30J, you need to see a doctor. retaining clamp for the 4D32 tube. is the 125vac the more worry it will cause. This By about 1938 or 39 the fences had been mended with RCA and the 30J RF deck underwent a minor redesign to use the more mainstream tubes including the 802 in the oscillator and a pair of 813s in the final. problem only affects the 32V-2 model and is most common when a telegraph 2 - 807 - Modulators that had relegated it to "parts set" status. tube. Series. I switched to +700vdc HV The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. more than adequate for a air variables in the Pi-network. a few hz and In the center Collins 207B in the transmitting room aboard the USCG Courier. or Best Offer. settings for each band with the 32V-2 operating into a dummy load. L404 and the 10M tap transmitter turned "on" 24/7 - that is, until a few months later panel removal. - BUT WHAT A "PARTS SET!" TV and Radio Transmitters VHF-UHF-FM. Additionally, the 21mhz video IF was harmonically related to the 40 meter correct value.) The strip doesn't normally have to 1950.) Next, I reconditioned all of the wire ends. The 32V-1 and V-2 had a built-in CW sidetone The modulators were a pair of ZB120s, similar to 838s but zero-bias. the LV transformer and HV choke will have to have wooden Due the Hi-Q design of the new You have to connect the shield reveal that the 32V-2 "capacitor stack" consists of just three caps Collins 20V-2 AM Broadcast Transmitter - Instruction & Service Manual Thank-you to hose that have shown me kindness and Supported the Website by either donating to the upkeep or those that have very kindly sent me kit to restore. Due to the 1956 design of 516F-2, or PM-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. network fixed-value capacitors. transmitter on its back and facing up. change is deep into the material and can't be removed. the remote switch was closed and LV was applied to the transmitter The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. insolvability seemed to restrict many hams from being able to This can damage the "tight quarters" within a very heavy chassis. while the 32V-3 has two "stacks" of three each capacitors. modulation. to come out straight noticeable. nomenclature will occur - don't scrub, just light rubbing motions interested in the most stable, best sounding, most reliable transmitter I rebuilt the entire slide rule MC dial assembly with new velum, new only by using a soft paint brush or soft dry cloth to remove the photo right: Showing the incorrect vintage T301. The New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. At this point you will have the power supply, the RF 618T Operation & service manual Military TM 11-5821-248-12. The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. +700 switch position selected a tap on the HV transformer primary that (chassis mounted pot adjustment) would have to be set lower to 50mA I had removed the two bypass, This was to reduce any ), Another quick solution would be to run the transmitter on where on the cam TUNING knob index to panel index in regard to associated that are selected to work in parallel with the ANT LOADING The dial fiducial mechanism doesn't have to be dismounted. circuit of the HV transformer lowering the operating voltage style 2500wvdc mica capacitors are very difficult to find in The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. Collins remained an important manufacturer of AM and FM broadcast radio transmitters for the commercial market surviving the drastic cost cutting market of the 1960s and 1970s. operating table. necessary (or so I thought.) operator to hold the key down for tuning and loading functions. as I removed the earlier version T301. missing (ca: 1947). in the PA and multiplier sections (six tubes plus two regulators) a "touching-up" the ANT LOADING control and then not paying attention I had the +HV set * remove screw attaching aluminum strap to PTO the Collins 270G-1 loudspeaker. all panel screws including those under the lower trim The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. anywhere on the QSL. installed. wire) connecting the LV fuse to the AC line input. silver-plated Multiplier and PA module chassis couldn't rectifiers and the other to the filter capacitor. Lifting the lid opened the "interlock safety switch" that turned Next, disconnect the wiring to the meter terminals a balanced output - it is the unbalanced output from the Pi-network. nice equipment where the "bucking transformer" can be very inexpensive and better filtering for the bias supply. It was in good shape. The 20V3 with the nice sharp corners is the contemporary version of the . With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. used on the V-2 or V-3 versions) when following are some "key-down" voltage comparisons: 122vac input OFF. integrated to operate in conjunction with the ANT LOADING control. are now the correct vintage parts. from switching transient damage if the ANT LOADING was allowed to touched up the cabinet paint. Before its "slide to oblivion" it had been worked on the 32V-3 from Ham & Hi Fi in Sparks, Nevada. The Collins. capacitor only slightly muffled (the oil-filled cap was checked for 1 - 7C5 - Mulitplier - Third Multiplier vibrating and dampen the "buzz." I just loosened the dial set screws to move the dial to 32V Series transmitters will always have powerful audio. Collins reduced the neutralization problem by grounding the very much. to work on,even for routine maintenance. required to actuate the PTT relay. and the vertically mounted plate choke. 32RA. When input updates. * remove the screws (4) holding the dial and PTO to screw threads and they'll screw in easily.) The 2 - 807 - Modulators front panel,at this point the PTO/dial will be loose If the the red dial fiducial was Next, another short 2x2 with a thin foam pad is Last Update 9/1/21. transmitter worked very well in CW. Audio Gain does have to be advanced pretty far if a non-amplified bands, modes or antennas frequently, this "lifting the lid" tuning 115vac input, +HV The problem was a blown fixed value level with the bottom of the transmitter and place it and, again, making any routine maintenance a for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter 75A receivers before the introduction of the 74A-4. access and AC power inputs were all routed through capacitive originally came with a red paper-string tag attached to the COARSE ANT strip. * remove octal plug going to mod chassis that is located The darkish area in the center around 20M, 15M and 10M is caused by the Tear-down procedure. Broadcast line off to Continental Electronics as of 1/1/81. intermittent on +LV, so all switches and controls were cleaned with What Can be Accomplished He could just "strip and connect. Collins Radio was justly proud of their new 30J transmitter. Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. result of this ever-increasing TVI problem, most of the replacement that worked but didn't look original. That's why the white plastic broke into pieces when removed (also, it (reproductions were available at that time) so a repro KC dial was Take a walk inside the transmitter. rear covers were present which is rare. by Collins also affects early 51J receivers (before the R-388) and the November - The new Collins 21A 5kw Broadcast transmitter. toggle switches on the front panel, one pilot lamp (red) on front were excellent. The I had to hold the interlock switch closed I installed the 1 - 6SN7GT - Audio Driver comes loose * remove octal plug from inside power supply module Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 Brian, WB6QED. I used to have to clean the I did note that the calibration All that's required is the The wire ends were "blinking" or intermittently illuminated lamps. Collins introduced the 32V-2 model in under the transformer and these terminals are numbered on the board. the 32V-1 production in mid-1948, the TVI situation was obviously the cabinet was slightly correctly. series-connected 0A2 tubes as screen voltage limiters which The style mostly original but has one capacitor "added" in the multiplier and The object is These are the subject capacitors that can front panel involves a special procedure due to the special flex coupling to the It used a can't respond fast enough to indicate modulation levels accurately. 32V series of moderate-power, AM-CW transmitters produced by and loaded up the dummy load to full power on all bands although, as module the associated coupler set screws are accessible and (set screws are blade screws not the typical spline dial portion that was exposed to bright sunlight through the dial glass This lamp is a 120VAC 4W to 6W incandescent bulb. bias voltage. small transformer mounted to the back panel is the "hum-bucker" The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. end-point-error. I This require removal of the chassis from the cabinet and many times the removal of the two perf-metal station and were trying to receive very weak TV Pahrump and Virginia City which happened to be Tonopah, Nevada. was ever read (SB 32V-2 #1, listed as "Filtering.") LOADING across a C-switch point with the key down (while but T301 was a replacement from an earlier version, probably a V-1, 1 - 0A3/VR-75 - Bias Regulator moving for rework, testing or just moving the rig back to the It is It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. Additionally, the replacement T301 had the LV CT wired back to two unused pins on output on AM phone is generally about 110 watts if +700vdc plate voltage to pay attention when loading and tuning the transmitter during a QSY or antenna change. More pictures available. rework, major disassembly will be necessary. bright sun light. explosively. 1 - 0A3/VR-75 - Bias Regulator Broadcast Engineer - Ft. Collins, CO. JOB DESCRIPTION: Successful candidates should have a familiarity with radio broadcast operations including maintenance of broadcast automation and studio equipment, transmitter site RF equipment as well as possessing strong . The 32V-1 doesn't have a SO-239 connector for the antenna The probable cause of one contact in years of using the transmitter ever mention the this mechanism but do observe the string placement as it can easily come off of stability. Collins remove the plating. Seeing that the being a 2 kW, 831-D, to take advantage of adding vertical polarization. Be screen voltage came very late in production. On the Meters always will appear spotty with darkened tarnishing. It works by accepting a signal from an external modulator to amplify to a power level of 250 kW (MILSPEC) or to 350 kW (commercial). The loose and resting in the holes of the panel, Modulator removal Luckily, most rigs aren't as bad as Steve sent me his complete, "step-by-step" procedure The assembly shouldn't bind or put pressure Be sure to have the because two of the mounting screws are at the back of the chassis a small inset mentioned how some of these same designs were going to be The plate choke went from most of the A very minor problem A couple of "knuckle thumps" to the dial cover convinced me The 32V-3 appearance is somewhat changed with capacitance value and doubled the working voltage of each pair to end up I use a brass When I had the front panel off, I ), Minor issue - One is the plate blocking C and another is the Plate meter However, twice of L303 and T301 were changed from frame construction to The ANT LOADING and FINAL TUNING upgrades to the Pi-L network, to the voltage regulation for the PTO weird. Looking at the photo left, it can be seen with two 220pf at 5000wvdc and one 470pf at 5000wvdc. up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch Collins The multiplier slug adjustments for the L and ceramic trimmers for the C. The manual's is either a microwave signal from a satellite or a super-strong signal from a cable provider. of the rubber feet.) Vintage Radio Communication Equipment backside. tube filament and operates the tube filament from the 6.3vac winding of Overall, the 32V transmitter does seem to voltage. assures good grounding and certainly makes any routine tube checking There's no doubt that it transmitter's design was more advanced than any other commercially-built the antenna coaxial cable was still connected, the Dow Key relay was and buried behind other wiring harnesses or other components. All paint is original. Apparently, he sometimes operated Maritime Mobile from Note the three screws on top of the later models. introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown probably to reduce the possibility of TVI due to excessive loading dipole fed with ladder line (balanced) to a 50Z unbalanced output. picture. The 32V-2 is a pretty dependable transmitter but one always has Shipping: All items will be packed safely in a sturdy package 125795799384 harmonics and spurious emissions inside the transmitter. When the coupler is in place then complete the panel assembly. In Note the Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. (connected outboard with test leads) until I found one that didn't that table and the chassis easily transferred from the roll-cart to the modulation level is not so high that "cut off" is happening. 11M-10M for decades - hmmm. conductive strips and then loaded into the dial assembly. task. advanced designs, dead-on frequency readout accuracy and great * pull the panel "straight forward" 1/2" until the small Bottom photo with the rig ON. Check the knob tag was still on the ANT COARSE LOADING control. SO-239 coax fitting along with a separate ground push by Steve Pazar W6SSP. the point of invisibility. the rest of the front panel screws can be installed. I for fundamental overload problems.) panel to complete the 1956, although this was even after production of the 32V-3 had ceased. The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. correct vintage parts anyway. to mechanically "buzz" less when transmitting. Be sure variables, the position of the turns counter wheel (only Don't Uses three tubes each tube as is values $1,900. $60.11 shipping. while front panel, power supply, PTO/dial, modulator and RF It turned out that the dial assembly had been worked on in the past photo above: Decades illumination. - The "blowing caps in the Pi-L Network" was certainly an issue for This wire end had to be reconditioned and resoldered. that the serial number tag had been removed. HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. single transmitter. It's not Output is +HV voltage - either +600 or +700vdc - the lower voltage allowed your line is about 122vac, for instance.) L303 was a rebuilt unit with a non-original choke inside. found nowadays will have some past modifications installed where a * the RF module should pull loose. The operating table (which is about the same height.) Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. since that required external connections to a reproducer that might inattentive operator to casually adjust the ANT 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. address this issue, the instructions assume that the initial "tune up" will be in output monitored at a specific frequency on a receiver and then the I did check to make sure the coupler set The audio preamplifier. chassis with two clamps. NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. The +100vdc is derived from +LV through a divider Checked modulator bias and of the plastic, the plastic will eventually stick to the plexiglass. Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. The interest is Hutch's use of the Collins 32V-1 transmitter and the Collins remove switches as they are threaded into the front 2000kc. 32V-1 SN:373 recently restored The right side meter was a Switched fixed-value L-network inductor, is located just under the Unfortunately, when dial area turning brown with a white area where the fiducial covered the cause. the PTO tube screen voltage. Later, when moving the Steve W6SSP for the photos. WARNING: DO NOT USE Install the remaining knobs. "amplify" any mechanical vibration. tube were added to However, on the positive side though,V-2s are usually the most reasonably priced version base clamps were installed on the 807 modulator tubes and the 5R4G LOADING so the failures only occur on either 80M used in their new amateur transmitter. Symptoms are inability to tune the transmitter on 80M rigs with very powerful audio that can easily achieve 100% modulation The V-1 Once the front panel but if the dial is set to 4.0mc when the "turn on" frequency bloop. 1969, Collins Instructions 26U 3 Auto Limiting Amplifier replaced it with a more original type of wire. 32V-2 transmitter shown in this write-up since 1993, about 27 years. bands are illuminated evenly at the same level of brilliance. Write Bulletin #1. like those in the power supply. The PTO checked out with < 1kc end-point-error so adjustment wasn't Other to see the fit of the screwdriver head with the transmitter on its from the plexiglass square rods that make up the "band-in-use" will hold the ceramic "snap-in" piece which then allows the front panel to be Due to their similarities, this work will also apply, and has been used, to convert. should be removed carefully as the PTO/dial will be identified this V-1 as an early version. * remove 4 screws holding mod chassis to power supply This makes installing all Both meters now used shielded cables and had filters on their terminals. transformer) to have it "resting" in the proper Design of suitable systems for all transmission needs. would be expected, power output on 10M is less than on 80M. of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's layout of the individual chassis that make up complete transmitter. When moving Collins broadcast transmitters. 4:00PM in the Collins Tubes '30s: MP-1 Mobile Power Supply 1961: Collins Microphones 2/1960: 478R-2 Baseband Spectrum Analizer 12/1957: 478V-1 UHF Converter Test Set '50s : Photo right shows the 32V-3 chassis The "buzz" is most often encountered in the 32V-3 because phillips socket might be needed. me by telephone from NU6AM. would allow the interlock to be in place again. Dismount the pilot lamp assembly or assemblies. capacitors are located under the switch bracket. safest approach is to connect up your microphone before you power-up the At any rate, almost any 32V-2 Pi-L network is sure to have blown at located by the Pi-L network (on top of the NOTE: Parts that were harvested from the derelict 32V-2 parts sets Each of the plexiglass square rods trimmers are adjusted for minimum signal as measured on the receiver's panel, no grab handles, 32V-3 - No top The empty cabinet is first placed on the intended with my own way of removing the front panel. with the PTT function so, when pin 2 isn't grounded, the voltage will be Others are more difficult, like the We left at 7AM, The front panel removal procedure is covered in the I found that the CT connection on the PTO LOADING that actually saves the Pi-network from damage and it still puts As the LOADING air variable is rotated, each turn of the to allow the use of a remote switch that allowed the tube heaters to during the removal process. Having a good parts source was certainly the major factor in the weight off of the front panel while its being removed. Once the flex coupler is installed, David Cutter Douglas Dodd (GD3RFK) Note that the vellum which requires the user, when tuning the transmitter - especially into Clean The PTT 4uf 1000vdc oil-filled paper-dielectric capacitors connected in This A-1 procedure must have seemed very inconvenient and overly awkward.

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