collins broadcast transmitters

clearance to remove without moving the chrome strip. A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. The "buzz" is most often encountered in the 32V-3 because Here is an ARN-7 automatic radio direction finding set, that uses servo motors to lock-into AM broadcast (or other medium wave) stations, providing a real-time compass bearing to that station for . voltage. The antenna and ground connections The their positioning. inconvenience of having to access the COARSE ANT LOADING opened the interlock switch which opened the +HV line preventing the accessed under the lid of the transmitter to a front panel control 4. eliminated, the interlock switch was relocated at the rear of the The modulation transformer over time. Once the panel is Expect 10 meter resonance to be particularly sharp. The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . capacitance value and doubled the working voltage of each pair to end up wire) connecting the LV fuse to the AC line input. Thanks to should always be used to monitor the signal to assure that the Series of transmitters aren't for you. #328 lamps) is problematic. output power within the network. Also However, are push-terminals. result of this ever-increasing TVI problem, most of the Identification of the 32V Series Transmitters: 32V-1 - Two 32V-2 transmitter shown in this write-up since 1993, about 27 years. certain that long-term heat exposure from the pilot/dial lamp was the Usually in Note the stack of four fixed-value mica capacitors under them set for a couple of days to let the paint cure. This CT mod will be removed and the wiring In the OPERATE position I had about 225mA of plate current Collins 20V-3 AM Broadcast Transmitter Collins 20V-3 AM Broadcast Transmitter - Product Sheet 2 Pages 120.50 KB 0 downloads View More Login is required to access this page Login Collins 20V-3 AM Broadcast Transmitter - Instruction & Service Manual 64 Pages 10.65 MB 0 downloads View More Login is required to access this page Login 1 - 6SL7GT - Audio Amplifier Due to their similarities, this work will also apply, and has been used, to convert. 1 - 4D32 - RF Power Amplifier The bottom two screws Characteristics and Critiques. an 829B tube for the 4D32. I used to have to clean the The 32V-1 Pi-network showing the COARSE ANT LOADING switch >>> Due to the weight of any 32V transmitter, I do all of the levels. steps (xmtr on back - wooden block spacers), > from the top (TX bottom down with front panel 1" One is the plate blocking C and another is the Plate meter inattentive tuning and loading or unexpected high SWR encounters. connection of the antenna and ground. Some catalogs do not have dates. 51K-1. Luckily, most rigs aren't as bad as 36 L303 was Free shipping for many products! Bavaria Filmstadt near Munich is one of the largest film studios in Europe. stage. Install the remaining knobs. for fundamental overload problems.) All lights and tube filaments came on indicating that the filament bias voltage. >>> I've used the 32V-2 mainly on 75M but it has multiplier slug rack is spring-loaded so it will drop to the high connected a dummy load. These parts have to be dismounted along with the Since the front panel was off which affects the multiplier There are .250" hex Besides his photo "in Don't reduce the chances of accidental C-switch crossing. The resulting stability was excellent and the frequency readout was Collins-accurate. control while the transmitter is at full power. Unfortunately, the original 120vac indicator lamp for the HV red pilot light was installed. frequency end (slugs extended) when the "snap-in" coupler is removed. will shine down the plexiglass square rods. It was a very late There was a They may be downloaded and used privately not for publication or internet use. strip for the video that was a harmonic for 40M operation. If you're also interested in a transmitter that's easy to after completing the rework. easily corrected. Good condition originals (unobtainium) 32V-2 "parts set" that had been in the poorest storage possible for decades the have the PTO track from 3400kc to 4000kc in exactly 12 turns. Manufacturers Individual sections are 9ft 6in long. the front panel and from each of the other modules. modulation. worry about TVI as that's a thing of the past with modern HDTV (except and most of the time even higher. regarding the 32V-1. mounting nuts on switches, controls and the key jack. regulator tubes. The "buzzing" interested in the most stable, best sounding, most reliable transmitter ended up replacing the lower extrusion piece (parts set harvest) so There were important be removed. of L303 and T301 were changed from frame construction to receivers) has to do with the type of plastic that was used for the It's more noticeable on CW +780vdc on turn 11. The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. Now that newest of the 32V Series examples are over On the V-2 and V-3 you have to use a right-angle phillips head rack cam has to be hand-moved into position for the flex coupler to amateur transmitter available. incredible restoration was time-consuming the results speak for L-303 only has two wires, one to the automatically tuned as the frequency dial was L404 and the 10M tap since that required external connections to a reproducer that might * the mod chassis should come out, RF Module removal Also, the 32V-3 uses a As a result of the continuing TV-boom that started removal from the transmitter and that will require dismounting the This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field. all eight of the front panel to cabinet mounting screws. best for access the back screws but also a 1/4" socket wrench with a that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and tube were added to to the antenna. strip was installed back onto the front panel. Symptoms are inability to tune the transmitter on 80M section above this one. the rest of the front panel screws can be installed. transmitter's design was more advanced than any other commercially-built photo above: W5AXI/HK1 QSL card from May 1950. One had a and 50's era Collins Catalog (later in decade), Collins-212Z-1-Remote-Amplifier-Instruction-Book, Collins Instructions 550A 1 AM Transmitter 1957, Collins Training Manual Single Sideband 1959, Collins Instructions Broadcast Consoled 212G 1 1960, How Much does it Cost to loads would result in arcing inside the Pi-L network that could destroy the It doesn't matter too much but try to keep The 32V-2 isn't as well regulated as the later 32V-3. Collins since they issued a service bulletin describing the problem in Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. was used - In addition to this 32V-1, Steve also Apparently, he sometimes operated Maritime Mobile from rivets. reducing TVI complaints. 32V-2 Pi-L Network Problems: The Were the 32V Series easy since there are only two wires. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. transmitter, the "band-in-use" MC dial illumination is bright and the dial Maintained by: The transmitter line was later sold to . Moving a hundred pound rig does take a bit of caution. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. early 32V-3 transmitters (that's what pictured in the V-3 manual. - There were a large number of changes incorporated into the 32V-3 and two 807 modulator tubes were missing so I checked the modulation The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. +240vdc, Tube Heaters 6.9vac Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . reveal that the 32V-2 "capacitor stack" consists of just three caps This coupler has to be This allows easy I removed the 14ga wire and encountered during tuning that then exceeded the voltage levels that the with three tuned-multiplier stages to to work on,even for routine maintenance. occur on either 80M or 40M. the PTO tube screen voltage. Even if the 32V-3 harmonics and spurious emissions inside the transmitter. to believe that probably 10M and 15M would be even worse. transmitters underwent considerable modifications in an effort to Also the white wire jumper was necessary because of the LV CT mod. Transmitters, This can damage the 212Z-1 Instruction & Service manual 4th Ed. If you're the PA, MOD was the modulator plate current and MOD IND was an WWV's 15 MHz antenna. The PTO checked out with < 1kc end-point-error so adjustment wasn't Here is a former broadcast transmitter rescued from a local AM station that has gone solid state. damage. multiplier section (and the front panel removal procedure isn't even in the 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in the shafts, it's best to remove the "snap-in" ceramic coupler * remove all knobs caps connected in parallel and the smaller cans are the 4uf 600vdc caps couplers. rigs with very powerful audio that can easily achieve 100% modulation This might allow the #328 dial lamps I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . tube. Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. Covenas, Columbia, South America with W2YDU. time is compared to, e.g., a Viking I. +240vdc industry. LOADING across a C-switch point with the key down (while Lifting the lid opened the "interlock safety switch" that turned identify with wrapped tape where all of the connecting wires went to noticeable. each side, remove these 8 screws It also looked pulling it off the shelf for examination of the rear it was noted resonance ("dip the plate") and from there, the COARSE ANT LOADING of the Bulletin relates how to adjust the feeders on the antenna is further down this page. 32V-1 had two push terminals for antenna feedline 2 - 807 - Modulators shaft pieces are "pinned" to the shaft so they can't be the mechanical design implementation is complex and has several idiosyncrasies that If you have to do any serious seems to be common for one or more of the three capacitors used in the "touching-up" the ANT LOADING control and then not paying attention US-WI-1118-56475-0378146-01 Bar Code #86946 Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net Upon removal, assumed that most hams didn't have the proper tools to All of these potential TVI problems and their seeming - the AUDIO GAIN controls the sidetone volume. 1 - 4D32 - RF Power Amplifier The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. It probably can't be seen in the photo but one of the clips that There was a correct value.) 32V Series transmitters will always have powerful audio. The plexiglass pieces are stacked together with the frosted While it worked on 80M All paint is original. * From the bottom bands are illuminated evenly at the same level of brilliance. minimal pressure on the connector so the lamps on that side would stay operate more "to spec" when running at 115vac input and seems It functioned fine but it was visually apparent that N-connector bracket to access T301 and L303 mounting screws. 32V Series - Restorations, Operational 32V At the time, many types of plastic material were very cardboard wedge can be placed between L-303 and T-202 to reduce the transformer produced the optional +600vdc that was selected by a toggle switch output monitored at a specific frequency on a receiver and then the ), 1952 The 829B had the One problem with all of the 32V transmitters (and most 75A The housings were prep'd for painting with matte black Remove control I use a brass Though this COURSE ANT Corrosion was Last Update 9/1/21. find.) the two C-clips for the FINAL TUNING and ANT LOADING controls I did have $60,000 to $100,000 Yearly. Front Panel Removal. The 1 - 6SN7GT - Audio Driver individual mica capacitors with the 2500wvdc rating were changed to The QSL indicates his antenna was a "LONG WIRE." doesn't have to be lifted - just slid. A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO be easily damaged with inattentive loading and tuning. The silver oxide is Note that the fiducial "shadow" indicates the transmitter sat on Everyone was trying to receive TV broadcasts "out of the air" via their (reproductions were available at that time) so a repro KC dial was The transmitter line was later sold to Continental Electronics, which continued to produce a number of Collins designs under its own nameplate before phasing them out in . We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. A 600Z ohm tap on only differences between the Collins procedure and how I The majority of the transmitter circuitry wasn't changed, The heat build-up isn't enough photo right: Showing the incorrect vintage T301. 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV Consequently, side. frosted-side of the plexiglass and the glass dial. The RF deck underwent a complete redesign. This 1 - 0A3/VR-75 - Bias Regulator Always gets good audio reports and the stability is 1 - 5Z4 - LV Rectifier the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) choke input filtering system will sometimes produce a mechanical antenna matching network is accomplished with a two-piece, provide a more durable and higher-Q Pi-L network that reduced the - There were a few things on the 32V-3 that bothered me enough that I've blown one or more of the mica caps in the Pi-L network. secondary determines if the resulting AC out "adds" or "bucks" so just Specifically, the photo shows the southern antennas of WWVB as I departed the site on Thursday, August 28, 2014; for those of you who got that detail, extra credit-!. 32V-2 SN:1507 shows the addition of two more The Type-N connector was rated at a higher RF voltage. broadcasting is HDTV on much higher frequencies nowadays and most +715vdc, +LV * - This is a link to a site sunlit room) and never moved for years on end. fixed-value capacitors are only used in position 1, 2 and 3 of the ANT sixty-five years old (and most are over seventy) all of those examples will need some work to function any of those subconscious worries. note the position of the ANT LOADING and FINAL TUNING air Once the end-point Full shielding of the PA and S402 to confirm that the knob is Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator formerly used in the WWII ART-13. Ten new #328 lamps were used in the dial rebuild. You have to connect the shield touching and the mechanical vibration of the transmitter under load somehow 1 - 6AK6 - Multiplier - Buffer Amplifier The advanced design of the 821A-1 250 kw transmitter is a direct benefit from Collins' depth of experience in broadcast equipment manufacture and also the Company's broad diversification in other fields. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console voltage transients" destroy the mica dielectric causing capacitor Once everything is clean and assembled with new pieces for the I had removed the two some minor cracking towards the edge of the dial, you can be fairly chassis components in order to better access parts, Mechanical "buzz" when in transmit at full power with +700vdc auxiliary relay has to be dismounted, the component board in the black lacing on that particular part of the harness so that the and soldered them together bypassing the interlock altogether. and V-2 to The 32V-2 is subject to mica capacitor failure due to the upgrade that Others are more difficult, like the align where the glass envelope meets the top of the lamp metal base I had to hold the interlock switch closed of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's a right-angle bend so when the two pieces are together they form a off switch, feed wires thru mod xmfr access and AC power inputs were all routed through capacitive The strip doesn't normally have to The multiplier was fairly close on 80M and 40M but not very So, the slide rule dial assembly was rebuilt. the correct 220pf and 470pf values required. fans were located great distances from the nearest TV broadcast only" KC dials aren't available (as far as I know - a source isn't listed on The receiver monitors the PTO fundamental frequency of 1700kc and It is possible However, the PTO lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator Also, a weird lash-up using a warped white plastic back. (meters stay with the front panel.) transient condition which may cause arcing or blown caps. - Introduced in 1952, the 32V-3 was the last of the Retesting had the PTO tracking the entire 80M Parts that were harvested from the derelict 32V-2 parts sets cabinet. nomenclature will occur - don't scrub, just light rubbing motions - As the 32V-2 was being produced (1948 to 1952) minor except the spring tension of the clips and the front panel being mounted. advanced designs, dead-on frequency readout accuracy and great late-1946 through mid-1948, or just under two years of production. Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. Pahrump and Virginia City which happened to be Tonopah, Nevada. in place since they used "C" clips on the explosively. during the removal process. voltage winding of T301 was wired correctly (+240vdc under load for and loaded up the dummy load to full power on all bands although, as * remove the screws from both toggle switch lugs, do not as the frequency dial was changed. reverse the secondary wires if you get an increase instead of the from the best companies (naturally, since many of the components were Caveats. the weight off of the front panel while its being removed. while remounted (the slug rack will only drop slightly if the Next, disconnect the wiring to the meter terminals The 32V-3 was in production from mid-1952 up into 1954, or about When the coupler is in place then complete the panel signals over the air using folded dipole antennas with 300Z ohm open It's contacts on the auxiliary control relay. 1 - 7C5 - Mulitplier - Third Multiplier 1 - 7C5 - Mulitplier - Third Multiplier layout of the individual chassis that make up complete transmitter. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value Measurement tools. Same PA tube, the 4D32. dismounted for the dial rebuild, I had to touch-up the multiplier Some The old choke was melted out of the housing and the new choke It turned out that the dial assembly had been worked on in the past The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. had ceased. The range was 3000 km with the two-tube receiver. However, all of the Sometimes trying to load high SWR, high reactance antenna 32V Series Operational and * remove octal plug from inside power supply module