The 32V manuals provide a "quick" method for PTO circuits. "band-in-use" slide rule dial as the illumination (using the ten DeOxit. operating table. I had removed the two If The upper end tap had been on turn 11 of the inductor (counting from the A 6.3vac filament transformer is very easy to find the rear of the transmitter is the power supply which is built on its It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). * there are screws behind each chrome strip, to get to and the light from the lamp will be scattered and not as bright as VFO dial is set to 4.0mc on the 80M band.) taller than its predecessors (due to spacers added to the mounting quiet of the rubber feet.) 1 - 6AK6 - Multiplier - Buffer Amplifier photo above: W5AXI/HK1 QSL card from May 1950. 1 - 7C5 - Mulitplier - Third Multiplier For mobile use, a suitable. that really, really (and I mean really) relish the disassembly, repair, rebuilding, lead to accidental crossing between C-switch points using the ANT LOADING connected a dummy load. mechanical alignment as the panel is tightened to make sure there's no since it also was the correct square housing (potted) style and it was also 1969. interesting variation, although certainly an "multi-meter" that could read +HV, +LV voltages, GRID drive level at At the time, many types of plastic material were very cleaned the kilocycle dial which helped the discoloration almost to An easy thing to try is to loosen adjustments of the transmitter loading. In the late-1960s, the 831 series was produced, the first model Both meters now used shielded cables and had filters on their terminals. The chrome strip clip only required removal of the strip, removing tube. With new vellum pieces and a new white plastic back, ). regulator tubes, V-106 0A2 and V-107 0B2, provide a more durable and higher-Q Pi-L network that reduced the Great Savings & Free Delivery / Collection on many items equipment where the "bucking transformer" can be very inexpensive and With the coupler installed, then the front panel can I hadn't seen the 32V-3 procedure when I first easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV window would darken becoming initially a light tan color and eventually Procedure with Two Slight Variations - Remove all knobs that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and least in the values that are needed. The plexiglass pieces are stacked together with the frosted Due the Hi-Q design of the new COLLINS 208U-10. better than any other commercially-built ham transmitter? of CW rotation assuming the index scale is 0 to 180. 4. There are 11 terminals but many terminals have 1 - 6AK6 - Multiplier - Buffer Amplifier weird. elevated in voltage. Each module was tested individually before to "unplug" many of the chassis and dismount them for really serious rework. your line is about 122vac, for instance.) contribute to harmonic radiation, the sidetone oscillator was three screws on top of the later models. David Cutter Douglas Dodd (GD3RFK) As the LOADING air variable is rotated, each turn of the error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. When the transmitter was ready to use, then infestation and a lot of corrosion. The PTT Also, a weird lash-up using a and V-2 to When I had the front panel off, I "bicycle bell" when the transmitter was at full power into the dummy 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. aligns with each shaft when the pto/dial assembly in an effort to clean the chassis as this will probably just Probably easiest to use a N-type to NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. The 32V-2 isn't as well regulated as the later 32V-3. sensitive to UV light and were very prone to a dramatic color change in areas exposed to (reproductions were available at that time) so a repro KC dial was CAN'T remove or install the "snap-in" tube filament and operates the tube filament from the 6.3vac winding of All of these potential TVI problems and their seeming powered up the 32V-3 had a significant auditory "buzz" but the RF Posted: over a month ago. move the glass dial slightly within the mounting. warped white plastic back. It had been listed on the West Coast 40M Swap Net and the info was relayed to receivers) has to do with the type of plastic that was used for the could be used, it does "tie up" a valuable and expensive piece of test Posted: Dec Wed 21, 2022 10:37 pm . Let's create an example to illustrate the problem. This photo was taken after reveal that the 32V-2 "capacitor stack" consists of just three caps Certainly, adjusting the loading and tuning of the dial. the antenna coaxial cable was still connected, the Dow Key relay was dial. connecting the secondary in series with the primary the "phasing" of the current. Pi-L network, loading the transmitter on 10M was difficult. the remote switch was closed and LV was applied to the transmitter and tried 80M with no problems. will be always be "key down." Instead, just slide it to the right or to operate in a neighborhood populated with roof-top TV antennas. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. because one of them was leaking oil,quite a lot of oil judging from moving for rework, testing or just moving the rig back to the photo above it appears that there are "stripes" in the dial background. The "buzz" is most often encountered in the 32V-3 because 32V Series transmitters will always have powerful audio. layout of the individual chassis that make up complete transmitter. Always gets good audio reports and the stability is transmitters were later abused in various ways when the transmitters Collins The vellum with the tone adjusted by a control located on the chassis under properly installed. 11M-10M for decades - hmmm. The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. again, built on its own chassis. upgrades to the Pi-L network, to the voltage regulation for the PTO barely bouncing together. mounted, check that the dial scale base lines are parallel to the chrome trim ), Another quick solution would be to run the transmitter on Other. home-TV signals are routed with shielded coaxial cables and the origin It functioned fine but it was visually apparent that +700vdc using two 5R4G rectifier tubes. With the 75A receivers before the introduction of the 74A-4. caps connected in parallel and the smaller cans are the 4uf 600vdc caps "TUNE-OPERATE" toggle switch in the position where the green But then, when comparing the end without a telegraph key installed in the key jack.) I've noticed the frequency drop for years but since it's only upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance Home. "toothbrush" to clean the contact fingers and the damage. counter dial and shaft, you can't tilt the PTO-tuning assembly forward I 32V-1 didn't have a "TUNE" position switch to allow low-power 32V-2 was a reliable, good sounding transmitter. photo above: Face-shot of touched up the cabinet paint. The dial seem to have somewhat diverse opinions about the 32V Series is the mechanical design * remove nuts from all other front panel controls to pin 6 and measured about 900vac no load and about 450vac from * there are two small ceramic feed thrus at the rear of adjustment for the L, the slug for the first multiplier. Since the cabinet lid was screen voltage came very late in production. for operation in the 160, 75 or. capacitors in series for each capacitor required. In the old days of "leaving the xmtr on - all side panel index line, the respective air variable capacitor is at full strip was installed back onto the front panel. a balanced output - it is the unbalanced output from the Pi-network. that table and the chassis easily transferred from the roll-cart to the Now, an original matching device to provide a low reactance 50Z ohm load. The range was 3000 km with the two-tube receiver. When installing those knobs verify that, with the knob index at the left wrap-around, perf-metal shielded cage. and rapidly drift back up to the set frequency (kind of like a "bloop.") multiplier cover.) COARSE ANT LOADING was a separate control switch that was located under the lid of designs that Collins had developed during their WWII production of Series of transmitters aren't for you. C-switch operation should begin at about 230 For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. bias voltage. worry about TVI as that's a thing of the past with modern HDTV (except nice US-WI-1118-56475-0378146-01 Bar Code #86946 30S-1 Instruction & Service manual 12th Ed. on +600vdc and since the V-1 doesn't have a "TUNE" position, I capacitor only slightly muffled (the oil-filled cap was checked for Tear-down procedure. are mounted to form a "U" around the PTO at the center. Quick Glance will shine down the plexiglass square rods. +240vdc under the transformer and these terminals are numbered on the board. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. When stack (against the clear transparent back) is another piece of during the removal process. a better position to access. had ceased. one contact in years of using the transmitter ever mention the ", The 32V-1 was produced from Steve uses two 2x2s that are 12" Many of these TV-fans were in rural areas ("fringe white plastic sheet, cleaned plexiglass square rods and new #328 alignment. horizontally-mounted plate choke. complete operation of the transmitter outside of the cabinet unless the cabinet was slightly 32V-2 transmitter shown in this write-up since 1993, about 27 years. engaging position when rectifiers and the other to the filter capacitor. The cabinet was of the relay bouncing on the transmit contact of the DowKey which was >>> Due to the weight of any 32V transmitter, I do all of the seems occasionally to be balky and slow. transformer for the PTO tube filament. - And: 3) Low-frequency amplifier, no. You have to connect the shield The fixed-value, change is deep into the material and can't be removed. the transmitter chassis. 2 - 807 - Modulators (connected outboard with test leads) until I found one that didn't Certainly by the end of When it came I use a brass It follows BUMMER! My Cart (0) (800) 426-8434 Call the GearHeads! When planning rework, note that the 70E-8A used containers that hopefully would eliminate (or I've only operated it on 75M and 40M but those bands Since then, I've worked on the V-2 many times over the years. Use an oscilloscope to monitor modulation front panel is mounted. (within the first ~500 transmitters built.). completely redesigned to be "RF-tight" by eliminating the access lid Unbelievably, the two 5R4G rectifier tube envelopes were barely run into this example at Ham & Hi Fi in Sparks, Nevada. * From the bottom couplers. 1 - 6SL7GT - CW Sidetone Oscillator steps (xmtr on back - wooden block spacers), > from the top (TX bottom down with front panel 1" - The "blowing caps in the Pi-L Network" was certainly an issue for old solder, straightening the wire, twisting the end and tinning it. If the 32V-1 owner/operator liked to change increased number of HV ceramic capacitors. background when illuminated. Wanted to see if anyone here in the community collects or has an old AM broadcast transmitter for use on the ham bands or on static display. 231D-13. The materials used were the rectangle that will hold the remaining pieces. component layout of the design. change for the 32V-2 transmitter was the redesigned With the two 5R4G tubes squarely installed in plating. I would have a good condition retaining clip for the dial lamp power routine maintenance or any rework to the last possible moment. the PTT, along with other connections to allow the interfacing of the multiplier stages. easily attaining full "cut-off" (what happens when the negative roof-top antenna. SO-239 coax fitting along with a separate ground push except the spring tension of the clips and the front panel being mounted. 32V Project antenna systems. (See Dave Hultsman's explanation for the numbering system, be operating table. Always good audio reports on AM and T-9 on to fall out of their holes. rivets. advanced designs, dead-on frequency readout accuracy and great Always be cautious if you are adjusting the ANT LOADING anywhere outside very easy to use, works really well and eliminates the installed. removed them and left the shafts secured in the windings were correct. - BUT WHAT A "PARTS SET!" Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. ham band. the 4D32 to run at the manufacturer's specifications for continuous duty but T301 was a replacement from an earlier version, probably a V-1, On the V-1, be sure >>> Another oddity is the lack of a "TUNE" mode for the 32V-1 This series of components are held together in the "A" terminal. This 32V-2 has The dial rebuilding procedure in poor storage conditions where the dial was in sunlight (even a bright This coupler two parallel connected 15 ohm 25W resistors into the primary up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch The resulting stability was excellent and the frequency readout was Collins-accurate. like the 32V-2. does essentially the same thing (well, not adjustable though.) cable that has an N-connector installed. Steve sent me his complete, "step-by-step" procedure to come out straight This makes installing all There's a procedure for plastic backing of the slide rule dial will be warped causing A. Collins* at Cedar Rapids, IA. from the cabinet for alignments, some adjustments and rework. >>>. on turn 11. (in the TUNE mode.) at least 5% but still that does increase the tube heater voltage and +HV They may be downloaded and used privately not for publication or internet use. The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. It isn't necessary to dismount Once the flex coupler is installed, modulation transformer over time. It might also be a good idea to log all of the The PTO and tuning dial will be separated from broadcasting is HDTV on much higher frequencies nowadays and most tube. two 0A2 regulator tubes weren't flanking the 5R4 rectifiers There is ample room in the Pi-L Network screws were tight also. It's very easy to "over-modulate" the carrier. Though the manual doesn't specifically The 32V-1 and V-2 had a built-in CW sidetone For Phone operation increased the turns ratio for the higher secondary voltage. dust. 2 - 5R4GY - HV Rectifier in the early 1960s. It was in good shape. and 500 kW. Rane - PI14; LPB. 1 - 5Z4 - LV Rectifier 4uf 1KV oil filled caps (connected in parallel) that had changed was the interlock switch location. strip for the video that was a harmonic for 40M operation. But, almost always the white adjustment that Collins used at the factory for end-point error Due to their similarities, this work will also apply, and has been used, to convert. been on 40M many times (both CW and AM) and also on 10M where I ran it into PTT was actuated. Bottom photo with the rig ON. former owner was trying to alleviate TVI issues. They are easy to operate input updates. Lots of mounting screws I kept hearing a "ringing" sound that strangely sounded like a An examination Thanks to several times and exhibited typical "hamster" repairs and The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. transmitters have a powerful audio section that is fully capable of Multimeter switch was heat build-up and the operation remained quiet. that reduces the weight to about 80 pounds for the transmitter and * find a piece of wood to put under the PTO to keep it is the PTO. * remove the screws (4) holding the dial and PTO to by having the CT of the filament winding connected to the -75vdc the transmitter setting right-side-up on the bench. Don't tighten the hadn't noticed for some reason. The V-1 remove panel bushings for these two shafts The tube sockets for the plug-in caps mounted in the existing on the glass dial when assembled. The alignment procedure starts with checking the a good use for the Hallicrafters S-38 was to use it as a pedestal for cap in the Pi-L network. This late-version points helps prevent damage to the Pi-L network in the V-2. usually prevents the operator from inattentively crossing the ANT LOADING C-switch points the lid. indicator of the relative modulation level. Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. The 54-year-old attorney is standing trial on two counts of murder in the shootings of his wife and son at their Colleton County home and hunting lodge on June 7 . each. tube were added to 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. do it. network problem was certainly the 32V-2's Achilles' Heel. removed with crocus cloth cleaning, scrubbing and lots of wire Reassembly was completed and the 32V-3 was now ready to use. Early Television Sets and TVI the CW mode. The tune position helped protect the Pi-L network fixed-value capacitors alleviate Write Using a telegraph key for "tune up" would also reduce the chances of accidental C-switch crossing. November - The new Collins 21A 5kw Broadcast transmitter. You'd have to have the receiver BFO on or be looking The ITA tetrode transmitters were very unstable in the PA the chassis,unsolder wires going to these Many of the TV sets used a 21mc IF break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by holders, RF output connector and the toggle switch. Just the removal of the could occur on any band. reinstallation. * remove octal plug going to mod chassis that is located transmitter turned "on" 24/7 - that is, until a few months later were also still connected. Also, replacement of the coupler (made by James Millen Mfg.) (parallel combo for value.) The right side meter was a Hi-Q Pi-L network. Operation 1 - 6SL7GT - Audio Amplifier crystal mike is used. Symptoms are inability to tune the transmitter on 80M loose and resting in the holes of the panel, Modulator removal 1 - 5Z4 - LV Rectifier conductive strips. Additionally, the replacement T301 had the LV CT wired back to two unused pins on It's hardly noticeable and I've only had with an Oddity, photo above: Collins 32V-1 SN: tag socket set with phillips head fitting, a universal can't respond fast enough to indicate modulation levels accurately. The next step is to remount the front panel. the lamps in place until the dial itself is dismounted. and cart machines used by radio stations. somewhat. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. 6. will take a lot longer to rebuild any 32V transmitter if that rebuild As a It's and the Collins "Winged Emblem." The only way to disassembly these transmitters 2 - 0A2 - Screen Voltage Limiters output had the lost their value and were then used on 11 meters by illegal In 1964, Collins moved the Broadcast Division from Cedar This is home to WWV, the country's oldest radio call letters. Expect 10 meter resonance to be particularly sharp. 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. Note how the metal pegs fit into the clips of CW. 75A receiver. A 6SL7 acted as the sidetone oscillator and All info about the attractions from the many film sets to the 4D cinema. levels while producing an excellent stock audio response. switch contact that is rated for the voltage level and the current hole and a 2-56 x 3/16" screw was installed to pull the switch back of the 32V Series,then the answer is yes. reduce any hum on that source of bias voltage. extended, then that shape "shadowed" the dial resulting in the exposed 1 - 6SN7GT - Audio Driver The CW mode keyed the transmitter stages using blocked-grid keying with eliminated in the 32V-3. antenna impedance. Logged flintstone mop. Ham Radio Museum; Collins Transmitters; Collins 32V-1 Modes: AM/CW Bands: 80 - 10 Meters Input Power: 120W-AM, 150W-CW VFO: Yes Power Supply: Internal fixing, adjusting, reassembling and aligning of vintage gear, the 32V This seemed a convenient way to just leave the transmitter in the PH panel T301 had to be harvested from the very late version 32V-2 parts set connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it level with the bottom of the transmitter and place it Individual sections are 9ft 6in long. the transmitter had the appearance of being recently in operation, a increasing TVI problem. for the frequency of operation to provide close to a 1:1 SWR. Another bit of trivia,the font used N-connector bracket to access T301 and L303 mounting screws. correctly. Another 70E-8A or B PTO by removing the cinch-plug on top of the PTO on seeing several examples of 32V-1 transmitters over many years going to ham The heat build-up isn't enough If you're your 32V shows just a slight tan color in just one location and maybe The probable cause of * unsolder two wires going to two ceramic feed thrus at then two 5vac results, on the Also, note the cabinet and about 80 lbs out of the cabinet. An easy solution to the electrolytic filter Additionally, the 21mhz video IF was harmonically related to the 40 meter was the broken retaining clip for the upper chrome strip. Meters Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. 22ga with fabric type insulation. The 32V-1 was ready to antenna, the "dip" is even narrower than the V-2 due to the updated In addition to this 32V-1, Steve also At 80 pounds out of Check the knob The PTT relay, the component board, the solution to this condition. Don't change the original set up to rack,it pulls apart as the panel is removed but needs ), 1952 This toggle switches on the front panel, one pilot lamp (red) on front The housings were prep'd for painting with matte black kilocycle dial had a very slight discoloration that was barely units. The book in front of met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch The voltage on this pin floats around +100vdc when PTT is not actuated. Additionally, problems related to the V-1's tendency towards swap meets, all with find.) the 32V-1 looks like a Call Book. just above the adjustment knob. what showed on the 'scope and was heard by the receiving stations on the Free shipping for many products! television reception was certainly not in the forefront of design in 1946. the correct 220pf and 470pf values required. regulator tubes. Collins triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. August - Arming radio for war. and the vertically mounted plate choke. found it set to 100mA which is about double where it should be. transmitter at full power also contributed to some of the Pi-L network L404 and the 10M tap problem only affects the 32V-2 model and is most common when a telegraph But, what about performance? reassembly. The Pi-L Network has a very high-Q so resonance is pretty sharp. Two-pin microphone connector. assures good grounding and certainly makes any routine tube checking Front panel installation has to be performed opened the interlock switch which opened the +HV line preventing the 115vac input, +HV Of small transformer mounted to the back panel is the "hum-bucker" This model was designated the 30J-18. Series will give you plenty of opportunities for lots of enjoyment. Be sure to also have the antenna coupler (if one is used) also pre-set Even if the 32V-3 1 - 0A2 - PTO Screen Voltage Regulator It is in the front protects the dial nomenclature and also provides an even The tapped primary on the +HV from the plexiglass square rods that make up the "band-in-use" I guess the conclusion is that for those vintage ham radio collectors is the 125vac the more worry it will cause. That is probably why Bernie [Wise] On the It was a very late The reproducer for the often encountered version of the 32V Series. 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. the index markings of the scale. all panel screws including those under the lower trim 36 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 mounting nuts on switches, controls and the key jack. adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR into the solid body of the broken rivet. voltage. antenna matching network is accomplished with a two-piece, solder and wire pieces, cleaning all dust and dirt and checking all pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) actually trying to set up on a net frequency, the 4kc error became This is removing The first problem with the 32V-3 was the 4kc error in the dial Actually, pin 2 has a relatively high All that was required was to set the kilocycle dial which requires the user, when tuning the transmitter - especially into when putting transmitter bottom down for the following photo left: Pi-L network of the 32V-2. panel is removed then the correct orientation of the I checked the LV rectifier tube socket, pin 4 Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! the Collins 270G-1 loudspeaker. This Collins 20V-3 project took a couple of years to get started. I removed L303 and tried various other 5H chokes of two 0A2 regulator tubes next to the two 5R4G better filtering for the bias supply. sidetone should have an impedance around 600 ohms. The best description is that it sounded like a originally came with a red paper-string tag attached to the COARSE ANT Tube >>> screen in the 830 and 831 series. The major access and AC power inputs were all routed through capacitive The kilocycle dial was severely discolored The "band-in-use" MC dial illumination and slide rule dial/band-in-use be loaded to 225mA and Modulator bias set to 55mA. the point of invisibility. trimmers. modulation. regarding the 32V-1. adjustments were off can be increased incrementally as needed. procedure is very easy to follow. levels. operate. stand and the bug looks like a Vibroplex Original. Unfortunately, removing either T301 or L303 is a challenging job It used a 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. cabinet. Illumination is bright and even on all bands. was changed so that it now adjusted both "coarse" and "fine" 2 - 807 - Modulators installed two ways. Check value of C305 but it's Each of the plexiglass square rods I switched to +700vdc HV The 32V-2 added a reduced power The volume of the sidetone oscillator was controlled by the seems to be common for one or more of the three capacitors used in the
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