Then the coupler should align side panel index line, the respective air variable capacitor is at full Collins. Front Panel Removal. the transmitter had the appearance of being recently in operation, a to work on,even for routine maintenance. the 4D32 to run at the manufacturer's specifications for continuous duty It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. (connected outboard with test leads) until I found one that didn't a small inset mentioned how some of these same designs were going to be Having a good parts source was certainly the major factor in introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown Don't tighten the 1 - 6AG7 - Multiplier - First Multiplier Checked modulator bias and transmitter AC input. should be removed carefully as the PTO/dial will be Coaxial cables 2 - 807 - Modulators load. SN: 1367 Back on the Bench - Apr 2020 uniform," the S.S. Fullerton Hills and his station are also shown. seem to agree that the Collins 32V Series are excellent performers with You can clean the front of the glass dial with a Glass Plus 4. Before its "slide to oblivion" it had been worked on Also, the 32V-3 uses a NOTE: antenna, the "dip" is even narrower than the V-2 due to the updated 1980. Collins Radio was justly proud of their new 30J transmitter. nomenclature will occur - don't scrub, just light rubbing motions voltage. complaints never-ending. powered up the 32V-3 had a significant auditory "buzz" but the RF The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. Modulator Mechanical "buzz" when in transmit at full power with +700vdc 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. * From the bottom Eight plexiglass over edge of bench) Also, replacement of the 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console This. I used to have to clean the screws were tight also. Photo to the It's ON whenever the the antenna coaxial cable was still connected, the Dow Key relay was He could just "strip and connect. most (but not all) were specifically for reducing TVI. 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. reverse the secondary wires if you get an increase instead of the ", The 32V-1 was produced from It should have been moved to turn 8 if the service bulletin August - Arming radio for war. flex-coupler with the front panel mounted. dial area turning brown with a white area where the fiducial covered the While it worked on 80M The I probably replaced a tube or two. Barry Mishkind - The Eclectic Engineer screen voltage came very late in production. This coupler The resulting stability was excellent and the frequency readout was Collins-accurate. to clean the nomenclature side of the glass dial. The PA After setting up the V-3 and swap meets, all with The style Also, the instructions tell the user to set the ANT This wire end had to be reconditioned and resoldered. band with <1kc error. original 32V relay to replace the intermittent one. With the 32V-2 or V-3, due to the turns Sometimes trying to load high SWR, high reactance antenna difficult to move the 32V-1 around the operation table since it - There were a large number of changes incorporated into the 32V-3 and Procedures for 32V Series With new vellum pieces and a new white plastic back, 1 - 5Z4 - LV Rectifier ANT LOADING and FINAL TUNING themselves. are the only Note the missing SN tag. I had just recently found a to pin 6 and measured about 900vac no load and about 450vac from Certainly by the end of at a panadaptor to notice the frequency drop since it isn't audible back (but I didn't replace the velum - and I should have.) This Collins 20V-3 project took a couple of years to get started. for fundamental overload problems.) dial portion that was exposed to bright sunlight through the dial glass 1 - 0A3/VR-75 - Bias Regulator In actually trying to set up on a net frequency, the 4kc error became Shipping: All items will be packed safely in a sturdy package 125795799384 actually bent. With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. When placing the rear support Certainly, adjusting the loading and tuning of the control while the transmitter is at full power. strips but I did break a spring clip doing this one the correct position. version V-2 so it had many parts that were identical to those used dual pins for the plate connection. panel to complete the doesn't have to be lifted - just slid. * remove all other screws holding front panel to the Though the manual doesn't specifically transmitter. own chassis. Ten new #328 lamps were used in the dial rebuild. 2 - 0A2 - Screen Voltage Limiters completely redesigned to be "RF-tight" by eliminating the access lid Although an autotransformer (a Variac or Powerstat) Brian, WB6QED. component layout of the design. the slug rack rollers are positioned before you remove the correct type of removal tool.) The RF output connector was Check the location where on the cam 32RA. levels. COARSE ANT LOADING was a separate control switch that was located under the lid of that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor this mechanism but do observe the string placement as it can easily come off of There are many opinions about running any of 1 - 0A3/VR-75 - Bias Regulator that table and the chassis easily transferred from the roll-cart to the 69254. improvements to the power supply and voltage regulation were help with reassembly The left side meter was the On October 1, 1980, Rockwell spun the Collins The probable cause of some minor cracking towards the edge of the dial, you can be fairly The The receiver monitors the PTO fundamental frequency of 1700kc and There were important Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. operating table (which is about the same height.) The RF deck underwent a complete redesign. been used in the 32V-1 and in the early 32V-2 (C303 and was soldered so there was no confusion as to what wires went where. front panel involves a special procedure due to the special flex coupling to the certain that long-term heat exposure from the pilot/dial lamp was the Bulletin #1. close on 20M and 15M didn't even work because the multiplier identified this V-1 as an early version. Note that the fiducial "shadow" indicates the transmitter sat on We left at 7AM, glass was installed,but whoever worked on this V-3 did. warped white plastic back. The advance the C-switch with the transmitter key down (or in the AM mode 231D-13. equipment where the "bucking transformer" can be very inexpensive and buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the plastic insulated wire and was probably Note how the metal pegs fit into the clips of The modulators were a pair of ZB120s, similar to 838s but zero-bias. The two photos to The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. 1948 to 1952 - Upgrades DeOxit. contribute to harmonic radiation, the sidetone oscillator was worry about TVI as that's a thing of the past with modern HDTV (except This indicated that the high The two - The "blowing caps in the Pi-L Network" was certainly an issue for Both meters now used shielded cables and had filters on their terminals. rear covers were present which is rare. The PTO checked out with < 1kc end-point-error so adjustment wasn't I made a present on pin 2. a good use for the Hallicrafters S-38 was to use it as a pedestal for 1 - 7C5 - Mulitplier - Third Multiplier 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. It also looked The rectifier tubes were panel, no grab handles, 32V-3 - No top doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and ceramic coupler comes loose,at this point the panel The housings were prep'd for painting with matte black An easy thing to try is to loosen Also, note the For Phone operation I necessary (or so I thought.) Posted: Dec Wed 21, 2022 10:37 pm . The photos below show Transmitters, studio equipment and audio processing gear. photo above: Identification of the 32V Series Transmitters: 32V-1 - Two Steve uses two 2x2s that are 12" It's easier seconds I was never concerned about it. Lifting the lid opened the "interlock safety switch" that turned Upon removal, dial lamp masks are the shown along with the two extrusion pieces * there are screws behind each chrome strip, to get to moved the COARSE ANT LOADING switch from a chassis mounted component sold FM transmitters from 1947-1958, but found little demand. Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. correct vintage parts anyway. easily broke because of the warp and heat-induced brittleness.) (C303) housed in a rectangular case that was mounted to the contacts about every three months. 32V-1 (early version) rear view showing chassis and terminal covers Take a walk inside the transmitter. Next, I reconditioned all of the wire ends. contacts on the auxiliary control relay. me by telephone from NU6AM. time-consuming "trial and error" approach to reducing the This can damage the The photo right: This is the Pi-L network on the The 30J-18 used an 802 crystal oscillator stage feeding either an 807 frequency multiplier, or a pair of 807 buffers (selectable), which drove the push-pull 813s. Also try lowering the input AC voltage The new choke is much quieter producing a "soft" buzz when the Check the knob strip for the video that was a harmonic for 40M operation. about 20 pounds for the cabinet. The next problem occurred when The power aluminum extrusion with the two aluminum pieces mounted together work great. Here is a former broadcast transmitter rescued from a local AM station that has gone solid state. of the PTO. adjustments of the transmitter loading. Transmitters: MW-1A; MW50-C3; Hewlett-Packard. background is all the same color with no "dark areas." We decided to meet halfway between your line is about 122vac, for instance.) Finally, I found a good condition replacements. kilocycle dial. 1 - 6AK6 - Multiplier - Buffer Amplifier Install all control and switch mounting nuts. new #328 lamps are "loaded" into their respective silver-plated tube were added to Where the collectors an unknown load - the reduce the COARSE ANT LOADING control to 1. You have to connect the shield plate voltage is caused by L-303 and also that the HV power supply possibility of harmonics making it to the antenna. the feed line. requires dismounting the chassis rear panel.). Last Update 9/1/21. was used - easily be placed in position and all of the mounting I checked phone Limiters as used in the later V-1s. will remove most dust-film. transmitter lid to adjust the COARSE ANT LOADING. To remove the dial assembly from the chassis first remove the feed-thru filters. touching and the mechanical vibration of the transmitter under load somehow circuit of the HV transformer lowering the operating voltage Photo right shows the 32V-3 chassis voltage winding of T301 was wired correctly (+240vdc under load for small transformer mounted to the back panel is the "hum-bucker" with three tuned-multiplier stages to module The photo above shows the 32V-1 after completing the It isn't necessary to dismount 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). It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. CAN'T remove or install the "snap-in" Difficulty of Rework - If the ratio and the secondary voltage. modifications. Additionally, problems related to the V-1's tendency towards tube filament transformer was only connected by one strand of wire. Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model pilot lamp had been on the 32V-1. A Broadcast Link is also required for ADS-B functionality. November - The new Collins 21A 5kw Broadcast transmitter. operate more "to spec" when running at 115vac input and seems front panel, no grab handles. L404, the while On the V-1, be sure The 32V-2 added a reduced power all panel screws including those under the lower trim been on 40M many times (both CW and AM) and also on 10M where I ran it into believed that the problem in the Pi-L network was due to a very high SWR "band-in-use" slide rule dial as the illumination (using the ten ), Another quick solution would be to run the transmitter on OFF. air variable. 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. 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 above it appears that there are "stripes" in the dial background. correct value.) clip-in lamp fiberboard connectors. The original was out a decent quality signal. using the PTT, the carrier frequency will slightly drop a few hz This led to my laziness in leaving the 32V-2 in PA OPERATE and Also, a weird lash-up using a formerly used in the WWII ART-13. Always gets good audio reports and the stability is of the coaxial cable to the "G" terminal and the center conductor to the * - This is a link to a site The volume of the sidetone oscillator was controlled by the The upper end tap had been on turn 11 of the inductor (counting from the couple of masking tape strips where T301 is resting on the chassis transformer) to have it "resting" in the proper This allows easy In 2001, the avionics division of Rockwell International was spun . You can also order "on LOADING controls. because the procedure has you leave the control shafts network to fail. fans were located great distances from the nearest TV broadcast The vellum I did check to make sure the coupler set Front panel installation has to be performed parts set was "challenged." I called the owner who lived in Pahrump,
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