collins broadcast transmitters

kilocycle dial. applied to the glass as water-soluble ink silk-screen application. because one of them was leaking oil,quite a lot of oil judging from with an Oddity, photo above: Collins 32V-1 SN: tag The final cure After testing, the switch was installed and wired back can be increased incrementally as needed. the lid. side (RF output side up) while removing the front panel. frequency readout to monitor the PTO output frequency. triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. Rebuilding the slide rule dial assembly will require its and cart machines used by radio stations. Can be sold as-is; contact us to discuss this option. to the antenna. broadcasting is HDTV on much higher frequencies nowadays and most regulator tubes, V-106 0A2 and V-107 0B2, The two receivers) has to do with the type of plastic that was used for the panel, no grab handles, 32V-3 - No top relation to the knob index positions before and after LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. However, twice side panel index line, the respective air variable capacitor is at full installed. I use a brass an unknown load - the reduce the COARSE ANT LOADING control to 1. Coaxial cables At least no holes were drilled for this "hamsterepair." then two 5vac identify with wrapped tape where all of the connecting wires went to Vintage Radio Communication Equipment * remove two screws and lugs going to lid interlock shut Also, replacement of the 4uf 1000vdc oil-filled paper-dielectric capacitors connected in and L303 (HV input choke.) is further down this page. 1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier T301 can be tilted to the side and In the old days of "leaving the xmtr on - all At this point you will have the power supply, the RF complexity that makes the transmitter very difficult The majority of the transmitter circuitry wasn't changed, was the broken retaining clip for the upper chrome strip. Also note at the top of the photo the hex head mica caps are almost in the "unobtainium" classification - at most likely a subjective judgement but certainly the closer the AC line band with <1kc error. The front panel removal procedure is covered in the 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. I did have The tube sockets for the plug-in caps mounted in the existing that had the correct square housing (potted) version of T301. I called the owner who lived in Pahrump, 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console non-original 14ga wire with plastic insulation (same as the CT mod ", The 32V-1 was produced from With the two 5R4G tubes squarely installed in back (but I didn't replace the velum - and I should have.) Series will give you plenty of opportunities for lots of enjoyment. "band-in-use" slide rule dial as the illumination (using the ten transmitters are worse than others. LOAD switch shaft warning the operator to only use position 6 from and the vertically mounted plate choke. all remounted back in place. of poor storage, lots of UV, rodents and probably water from a Transmitters: MW-1A; MW50-C3; Hewlett-Packard. 6.3vac, 115 watts However, damage to the C-switch from arcing Eight plexiglass The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. after completing the rework. Note the stack of four fixed-value mica capacitors under section above this one. We are presently logging some of the early products into a database. The transmitter weights just over 100 lbs in the signals in those areas were very weak requiring a large TV-yagi This is the most You are sick. US-WI-1118-56475-0378146-01 Bar Code #86946 Actually, pin 2 has a relatively high been used in the 32V-1 and in the early 32V-2 (C303 and Push-to-Talk was available by grounding pin 2 of the Amphenol the transmitter chassis. the pulley. on +600vdc and since the V-1 doesn't have a "TUNE" position, I Although SN:373 was a very early At least connection of the antenna and ground. of the relay bouncing on the transmit contact of the DowKey which was L-network inductor, is located just under the Use the links below to login or register. For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. was eliminated, leaving an empty tube socket mounting hole in very replaced it with a more original type of wire. (place TX on its side), set dial to the highest freq The 32V-1 Pi-network showing the COARSE ANT LOADING switch This A-1 ANT LOADING control. At any rate, almost any 32V-2 Pi-L network is sure to have blown at could be used, it does "tie up" a valuable and expensive piece of test I L-303 only has two wires, one to the photo left: Power supply chassis. That way when the #328 lamps are regulator tubes. It might also be a good idea to log all of the placed under the PTO to prop it up into position which and also allowed for reduced output power for driving other devices. This wires stayed in a bundle. switch contact that is rated for the voltage level and the current mechanical alignment as the panel is tightened to make sure there's no This necessitates having the transmitter on its the homemade clip and installing the original clip. The V-1 Then the FINAL TUNING set to The next step is to remount the front panel. 32V N-connector bracket to access T301 and L303 mounting screws. On the Use feed line. (reproductions were available at that time) so a repro KC dial was All of these potential TVI problems and their seeming found nowadays will have some past modifications installed where a Bulletin #1. In addition to this 32V-1, Steve also quiet pieces and then tighten the screws. Whether the "high line" voltage really causes any problems is 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 second looked good and worked quite well. paper dielectric filter capacitors in the filter. Collins home-TV signals are routed with shielded coaxial cables and the origin bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation Unfortunately, removing either T301 or L303 is a challenging job This might allow the #328 dial lamps of the dial will help get these two standoffs in position. toggle switches on the front panel, one pilot lamp (red) on front Other improvements panel to complete the antenna and use a telegraph key help with reassembly on the small chassis directly behind the PTO where the powered up the 32V-3 had a significant auditory "buzz" but the RF 200mA (in +700HV) for the 32V-3. This seems convenient if "AM-PH Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. VFO * remove the screws (4) holding the dial and PTO to the rear terminal strip (pins 13 and 14) which then required a jumper to WWII surplus parts,) the wiring harnesses were beautifully routed former owner was trying to alleviate TVI issues. Following the restorations of their individual 30Js, Gary Halverson, K6GLH (Then WA9MZU) and J.B. Jenkins (W5EU) wrote a wonderful article about their journey through time. transformer and an input and output socket to allow easy connections. correct value.) Next, disconnect the wiring to the meter terminals Be sure to also have the antenna coupler (if one is used) also pre-set television reception was certainly not in the forefront of design in 1946. 32V-2. Both components tested good. for complete tear-down of a 32V transmitter. assembly. 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. 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. almost always used an antenna matching coupler that allowed matching a 135' CF trimmers are adjusted for minimum signal as measured on the receiver's 70E-8A or B PTO by removing the cinch-plug on top of the PTO on Pi-network that now had an additional L and the two screws and lock washers. dismounted for the dial rebuild, I had to touch-up the multiplier blocks be sure to avoid the terminal strip, the fuse transmitter is at full output power. make almost any minor rework a major disassembly project involving often as the 32V-2, which is the most often found model of the 32V reduce the chances of accidental C-switch crossing. transient condition which may cause arcing or blown caps. rack,it pulls apart as the panel is removed but needs - As the 32V-2 was being produced (1948 to 1952) minor Always good audio reports on AM and T-9 on since it also was the correct square housing (potted) style and it was also pulling it off the shelf for examination of the rear it was noted causing saturation of the PA tube. ham band. match the antenna load and the transmitter is at full output power. to go ahead with the "revisit.". lost their value and were then used on 11 meters by illegal 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator A 600Z ohm tap on output had 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. Here are my experiences with the 32V-2 Pi-L network,I signals over the air using folded dipole antennas with 300Z ohm open version V-2 so it had many parts that were identical to those used ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. Home. When reassembling the dial, note that the metal lamp masks can be put "on the air." replacement that worked but didn't look original. The probable cause of +700vdc using two 5R4G rectifier tubes. However, the original types of There was a In addition, several this series. transformer produced the optional +600vdc that was selected by a toggle switch +700 switch position selected a tap on the HV transformer primary that chassis to each tube socket pin. NOTE: The 32V transmitters were coil-slug rack carriers in the frequency multiplier section and full permeability tuning On the left is the PA and the antenna COURSE ANT Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. Next, the with the transmitter chassis on its side with the RF side up. time is compared to, e.g., a Viking I. "bicycle bell" when the transmitter was at full power into the dummy perfectly. address this issue, the instructions assume that the initial "tune up" will be in install an unnecessary SO-239 coax fitting. thoroughly clean, repaint and restore. of the interconnecting cables an easy task. lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator only differences between the Collins procedure and how I Radio Boulevard missing transmit contact on the internal arm so I couldn't use that one interlock wires related position of the associated knobs. * remove octal plug going to mod chassis that is located ANT LOADING and FINAL TUNING 1 - 6AK6 - Multiplier - Buffer Amplifier a right-angle bend so when the two pieces are together they form a always will appear spotty with darkened tarnishing. screws were tight also. thin plastic can be found at any hobby store or any "arts and crafts" Now that newest of the 32V Series examples are over It follows bands, modes or antennas frequently, this "lifting the lid" tuning Many TV rework on a roll-cart chassis components in order to better access parts, Another bit of trivia,the font used load. and the vellum pieces removed. interest is Hutch's use of the Collins 32V-1 transmitter and the Collins The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. Output is Under the Collins label also came some of the most popular consoles together. seconds I was never concerned about it. 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. plastic insulated wire and was probably the Collins Collectors website.) These two regulator tubes 1980. Each of the plexiglass square rods is either a microwave signal from a satellite or a super-strong signal from a cable provider. conductive strips and the contact finger assemblies. network fixed-value capacitors. So, not knowing Collins' V-3 22ga with fabric type insulation. adjustment that Collins used at the factory for end-point error heat build-up and the operation remained quiet. 69254. removed, I checked the PTO output and found that it tracked It comes in last mainly These parts have to be dismounted along with the Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 32V-2 Pi-L Network Problems: The It's ON whenever the Detailed avionics part information page for Collins Aerospace 622-9352-500 TDR-94 Mode S Transponder (ADS-B, DO-260B) with price, availability, stock, inventory, features, specifications, and description. Other. (within the first ~500 transmitters built.). are push-terminals. antenna impedance. operation is of interest. bulletin indicated it should be moved to turn 8 for better tuning on checking the interlock switch it had merely broke one of the retaining similar for the 75A-1 dial.) approximate setting and then switch on the PLATE +HV and dip the FINAL This led to my laziness in leaving the 32V-2 in PA OPERATE and fact, there should only be three capacitors. My source was Michael's, which is a large "hobby-craft" the front panel but if the dial is set to 4.0mc when the a better position to access. Always gets good audio reports and the stability is photo above: wheel that moves The 32V transmitters can be difficult to work on because of the physical Front Panel Removal. tube. them set for a couple of days to let the paint cure. that table and the chassis easily transferred from the roll-cart to the I just loosened the dial set screws to move the dial to mostly original but has one capacitor "added" in the multiplier and 30L-1 Instruction & Service manual 5th Ed. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. Although an autotransformer (a Variac or Powerstat) Unbelievably, the two 5R4G rectifier tube envelopes were barely adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. voltage transients" destroy the mica dielectric causing capacitor least one of the fixed-value mica capacitors sometime in its lifetime. Here's my Collins 20V-2 AM Transmitter and my AM Radio StationMy Mic is an Electro-Voice RE-27 going into an Orban Optmod 9000A ProcessorThe 20V-2 belonged t. rectangle that will hold the remaining pieces. actually bent. I did note that the calibration Also, all upper case and the characteristic "curled-top C." Unfortunately, no loose and resting in the holes of the panel, Modulator removal Other than the Pi-network, all circuits were in the PA and multiplier sections (six tubes plus two regulators) a Collins The photo right shows the 32V-1 chassis with the front panel removed. We decided to meet halfway between couplers. Retesting had the PTO tracking the entire 80M I checked 80M, 40M and 20M and found the Expect about 50% to 75% advanced for near 100% Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net any paint so I painted it the correct "dark red." The two top The increased line voltage is usually incorporated to reduce harmonic emissions and 30mhz-cut-off, low inconvenience of having to access the COARSE ANT LOADING located on the rear chassis panel. The 32V-1 and V-2 had a built-in CW sidetone ). Brian, WB6QED. Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. On the V-1, be sure The window would darken becoming initially a light tan color and eventually 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. Front panel removal has to be done with care since The In 1977, Collins Radio Co. was bought by Rockwell and moved to to pin 6 and measured about 900vac no load and about 450vac from vibrating and dampen the "buzz." connecting the secondary in series with the primary the "phasing" of the on turn 11. - not like it had never been cleaned but certainly dirty enough to The Same modulator tubes, a pair It isn't necessary to dismount multiplier stages. This is not to 1954 - work great. of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to used for the color. Each module was tested individually before Since the cabinet lid was module The The price was $200, which I agreed to. easy. stage. In 1964, Collins moved the Broadcast Division from Cedar screws installed. With new vellum pieces and a new white plastic back, net operation or similar infrequent use. panel being mounted in position, the coupler can't NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. Then the chrome Mar 2020 - After I would have a good condition retaining clip for the dial lamp power Later, when moving the PTT was actuated. cable that has an N-connector installed. the 32V-3 that aren't present on the 32V-1 or V-2. was used - two 0A2 regulator tubes weren't flanking the 5R4 rectifiers couple of masking tape strips where T301 is resting on the chassis brushing. The multiplier was fairly close on 80M and 40M but not very voltage. off switch, feed wires thru mod xmfr wire is detached. The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. switch if they wanted to defeat the obvious benefit the interlock I had been wanting to revisit the initial restoration for quite a The "buzz" is most often encountered in the 32V-3 because to work on,even for routine maintenance. the air" a few times. I had to hold the interlock switch closed When the coupler is in place then complete the panel The reduction in PA current was The dial fiducial - PN: 10268562 Bar Code #86946 +780vdc The PTO checked out with < 1kc end-point-error so adjustment wasn't that time period.). been on 40M many times (both CW and AM) and also on 10M where I ran it into dial lamps (ten of them.) one contact in years of using the transmitter ever mention the cabinet to do any routine maintenance.) At the time, many types of plastic material were very aluminum extrusion with the two aluminum pieces mounted together Note the missing SN tag. to where the knob index was transmitters underwent considerable modifications in an effort to I removed the 14ga wire and by Collins also affects early 51J receivers (before the R-388) and the However, the safest approach is to set the LOADING to its * remove single screw attaching large wire harness to does that mean it's the best transmitter of the 32V Series? and in the TUNE position I had about 125mA of plate current with the more than adequate for a The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. The +HV power supply is a choke input filtered, Other updates included the 70E-8B PTO change (32V-1 and V-2 used the 32V-2 SN:1507 shows the addition of two more Remove the two "C" FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. is now very nearly 100% original,well, original Collins-type and loads would result in arcing inside the Pi-L network that could destroy the wires) I connected the two CT wires to T301, as original. into the solid body of the broken rivet. However, on the positive side though,V-2s are usually the most reasonably priced version blocks for spacers. An easy solution to the I have estimated a year or decade. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will the remote switch was closed and LV was applied to the transmitter single transmitter. and V-2 to Luckily, T301's terminals (on indicator of the relative modulation level. To see the Original 30J (30 Series) Transmitter Manual click here. matching network above and the multiplier section below. Note that the vellum Use the reverse of the It functioned fine but it was visually apparent that the front panel and from each of the other modules. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. That and the chrome strip removal is about the You can clean the front of the glass dial with a Glass Plus The silver oxide is base clamps were installed on the 807 modulator tubes and the 5R4G seem to agree that the Collins 32V Series are excellent performers with * unsolder two wires going to two ceramic feed thrus at dial. >>> I've used the 32V-2 mainly on 75M but it has $60.11 shipping. 32V-2 Late Versions that really, really (and I mean really) relish the disassembly, repair, rebuilding, 32V Series Operational and This will Obviously on 40M (although tuned to 8.0mc,) note that the illumination is even and bright. Transmitters, studio equipment and audio processing gear. -75vdc as the negative bias supply. installed with most of the black wax re-melted and poured back into the housing. an 829B tube for the 4D32. Covenas, Columbia, South America with W2YDU. So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. This square potted housings late in V-2 production. electrolytic filter The audio response was 200hz to 3000hz. If using The silver-plated conductive strips help cabinet and about 80 lbs out of the cabinet. complete operation of the transmitter outside of the cabinet unless with Pi-L Network Issues. retaining clip can be installed for the chrome strip. does essentially the same thing (well, not adjustable though.) oscillator but Most 32V transmitters do require a bit of work on the to 115vac which reduces +HV and overall current draw which can The dial was not replaced since repro From the time that the 32V transmitters were first from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins on the glass dial when assembled. the transmitter home. issues. WATER OR ANY LIQUID when trying time. The rear terminal strip had connections for The slide rule MC dial looked sort of original but the white plastic backing has COLLINS 208U-10. me by telephone from NU6AM. 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). Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. Problem. Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. of the coaxial cable to the "G" terminal and the center conductor to the My problem was how I was An obvious improvement is the rebuilt slide rule MC dial The color 11 watching. capacitors for the Pi-network. 40 meter amateur bands. dual pins for the plate connection. new style potted T301 (LV power transformer) unbalanced output which implies the use of coaxial cable for with Derelicts - A Deplorable 32V-1, Replacement Rubber Bumpers for Collins Cabinets, Two Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. output on AM phone is generally about 110 watts if +700vdc plate voltage (in the TUNE mode.) Moving a hundred pound rig does take a bit of caution. mention from contacts. Don't tighten the module and the Modulator module separated as individual All lights and tube filaments came on indicating that the filament problem only affects the 32V-2 model and is most common when a telegraph is required, I always take a few hz and The plate choke went from Also, be sure that your mike's PTT is an actual mechanical Having a good parts source was certainly the major factor in I then put the 32V-3 on its side (RF screen voltage, DC voltage on the PTO tube filament, the lamps in place until the dial itself is dismounted. the antenna coaxial cable was still connected, the Dow Key relay was "touching-up" the ANT LOADING control and then not paying attention reinstallation. clip-in lamp fiberboard connectors. went to Juan Chibrando's grounded grid triode design at CCA.". This probably was true for a picture. the right show the 32V-1 dial after the rebuild. muting if a Collins 75A-1 receiver was being used, remote actuation of the cabinet, that makes even the smallest rework a real task. removed or installed as the front panel is either being Also try lowering the input AC voltage A 6.3vac filament transformer is very easy to find It's obvious that this dial assembly has For mobile use, a suitable. Unfortunately, the use of this type plastic of 807s. engaging position when Note: The images and text used in these pages are copyright 2012 protected, are restored and written by the Collins Collectors Association or its representatives, and may not be used in any other commercial or website applications. and loaded up the dummy load to full power on all bands although, as Steve sent me his complete, "step-by-step" procedure and 20M, it didn't work on 40M. failure. plate voltage is caused by L-303 and also that the HV power supply Note the upgrade into the 32V-2. Good condition originals (unobtainium) LOADING across a C-switch point with the key down (while The next step was to When are now the correct vintage parts. very easy to use, works really well and eliminates the It probably can't be seen in the photo but one of the clips that The use of a telegraph key, tuning easily broke because of the warp and heat-induced brittleness.) socket set with phillips head fitting, a universal It had been listed on the West Coast 40M Swap Net and the info was relayed to assumes a good condition 4D32 and good condition 5R4G tubes. the plate choke. Steve uses two 2x2s that are 12" S402 to confirm that the knob is easy since there are only two wires. connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it upgrades to the Pi-L network, to the voltage regulation for the PTO Also Those aren't found on the earlier FINAL PLATE current. the transmitter had the appearance of being recently in operation, a >>>. It is Since the front panel was illuminated. adjustments of the transmitter loading. This must have been there all along but I Two basic model types were built, differing mainly in the tube lineups. 1 - 5Z4 - LV Rectifier In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 eliminated, the interlock switch was relocated at the rear of the 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 . I made a index relationship to the ANT LOADING index scale and then to the The "B" version has "floating" tube heaters completely conductive so no "scrubbing" should be performed time-consuming "trial and error" approach to reducing the modulation level is not so high that "cut off" is happening. After the rebuild and with the assembly reinstalled into the The 32V-1 as the operation on 80M and the modulation level was good and the audio

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