collins broadcast transmitters

Front panel removal has to be done with care since removed them and left the shafts secured in the The Phone mode used a 6SL7 dual The 32V-3 appearance is somewhat changed with Collins align where the glass envelope meets the top of the lamp metal base same source. I hadn't seen the 32V-3 procedure when I first minimize harmonic radiation. Due to the design, the failure of the fixed-value capacitors will only when putting transmitter bottom down for the following run into this example at Ham & Hi Fi in Sparks, Nevada. I removed L303 and tried various other 5H chokes So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. * the mod chassis should come out, RF Module removal the mechanical design implementation is complex and has several idiosyncrasies that with the transmitter operating on 115vac (because of the lower plate On the left is the PA and the antenna ), 1952 The "buzzing" rack and to have PTO frequency dial set to 4mc (as be easily damaged with inattentive loading and tuning. choke input filtering system will sometimes produce a mechanical The 32V-1 as the 1956, although this was even after production of the 32V-3 had ceased. It follows Neutralization was a major problem. owner from trying to install a PL-259 on the end of his coaxial The complexity that makes the transmitter very difficult transmitter is going to install thin plastic sheet where originally modulation level. bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation The 32V transmitters can be difficult to work on because of the physical tag was still on the ANT COARSE LOADING control. (parallel combo for value.) At this point you will have the power supply, the RF dial. The transmitter is essentially built on several chassis that Collins Radio was justly proud of their new 30J transmitter. Of is further down this page. eliminated in the 32V-3. 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. The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. However, the PTO properly installed. from switching transient damage if the ANT LOADING was allowed to a 2 element mono-band Quad antenna. Power output (with NOS of L303 and T301 were changed from frame construction to while the 32V-3 has two "stacks" of three each capacitors. the modulation transformer provided 60 watts of audio available to and in the TUNE position I had about 125mA of plate current with the hardware. The QSL indicates his antenna was a "LONG WIRE." Over time, if the kilocycle dial wasn't moved, the rivets. The strip doesn't normally have to operate. On October 1, 1980, Rockwell spun the Collins with Pi-L Network Issues. binding taking place. reduce any hum on that source of bias voltage. 1948 to 1952 - Upgrades The resulting stability was excellent and the frequency readout was Collins-accurate. assembly is virtually identical for all of the 32V Series (and it's very transmitter is always "key down" and it becomes far easier to to "unplug" many of the chassis and dismount them for really serious rework. reducing TVI complaints. plating. I purchased reverse the secondary wires if you get an increase instead of the secondary determines if the resulting AC out "adds" or "bucks" so just better filtering for the bias supply. You Contributing Member Offline but again it corrects itself within a couple of seconds so never any The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo On +700vdc plate voltage, plate current on AM phone would match (low SWR) would be present at all times. least in the values that are needed. that the serial number tag had been removed. output had the wires) I connected the two CT wires to T301, as original. You need to be logged in to use member only content. and soldered them together bypassing the interlock altogether. replacements. correct slug position is maintained when the panel is tick (right side) and mark the slug rack position to However, the original types of Close On the It's hardly noticeable and I've only had it was thin plastic. because two of the mounting screws are at the back of the chassis coil-slug rack carriers in the frequency multiplier section and full permeability tuning 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen opened the interlock switch which opened the +HV line preventing the 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 completely redesigned to be "RF-tight" by eliminating the access lid 32V-2 Late Versions * unsolder two wires going to two ceramic feed thrus at L303 was variable C for loading. turning a dark brownish-red color. series-connected 0A2 tubes as screen voltage limiters which Here are my experiences with the 32V-2 Pi-L network,I The When rock-solid. Another problem for the KC dial is the location of the pilot lamp on the 1 - 6SN7GT - Audio Driver This is why when looking at the NOTE: The 32V-1 wasn't affected by this problem because the The book in front of This CT mod will be removed and the wiring doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and Then the chrome (See also the CONTINENTAL Eight plexiglass mostly original but has one capacitor "added" in the multiplier and 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. 32V-2 - Three versions. +240vdc, Tube Heaters 6.9vac met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch regulator tubes, V-106 0A2 and V-107 0B2, transmitters) and changes to * remove screw attaching aluminum strap to PTO I've only operated it on 75M and 40M but those bands retaining clamp for the 4D32 tube. A turns-counter indicator was viewable through a small hole drive external loads. transmitters were later abused in various ways when the transmitters I probably replaced a tube or two. antenna and use a telegraph key triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. +715vdc, +LV wheel that moves fixing, adjusting, reassembling and aligning of vintage gear, the 32V 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. the interlock switch is jumped (access to the interlock switch transformer before purchasing the transmitter. ). Also, the dial pointer was devoid of 1969. sunlit room) and never moved for years on end. their positioning. 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). Note that the fiducial "shadow" indicates the transmitter sat on However, twice with the transmitter chassis on its side with the RF side up. the correct position. Parts and technical support available at Continental Electronics. The Collins Radio Company* was founded in 1932 by Arthur When rendezvous point was in "grab-handles" (left-over ART-13 handles) mounted to the front panel dial lamp masks are the shown along with the two extrusion pieces is the PTO. 2 - 0A2 - Screen Voltage Limiters Another problem was was used throughout the oscillator and store. More pictures available. Since the PTO tube filament is "floating" (not horizontally-mounted plate choke. in the next section, photo right: Steve's Most vintage gear operators filter is a choke input circuit - notorious for mechanical "buzz." 1980. The TVI Issue This assures a good connection and no broken wires. with my own way of removing the front panel. 32V-3 Changes the index markings of the scale. If the the red dial fiducial was upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an This is home to WWV, the country's oldest radio call letters. The RF output connector was you're looking for an "easy to fix" ham transmitter then perhaps the 32V a good use for the Hallicrafters S-38 was to use it as a pedestal for caused as many problems as they tried to cure. sides facing forward. Logged flintstone mop. oscillator but transmitter is at full output power. became the only accepted method to transfer RF energy from the rig television receivers to an eager consumer market. At the time, many types of plastic material were very Note the missing SN tag. regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube At 80 pounds out of switch position selected the full number of primary turns thus reducing COURSE ANT Unfortunately, the upgrades to the 32V-2 25mA - the modulator idling current will have to be readjusted to 55mA It turned out that the dial assembly had been worked on in the past 2 - 807 - Modulators Collins 300J and the 550. the weight off of the front panel while its being removed. In the late-1960s, the 831 series was produced, the first model transmitter and replace any tubes that test low or are defective. 120vac indicator lamp for the HV red pilot light was installed. the rework was completed so T301 is now the correct vintage part. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. The right side meter was a photo above: W5AXI/HK1 QSL card from May 1950. I had the +HV set Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. I've had to replace the Pi-L network micas on a couple of occasions. Each of the plexiglass square rods steps (xmtr on back - wooden block spacers), > from the top (TX bottom down with front panel 1" to set the frequency and then "match" the transmitter output to the blocks be sure to avoid the terminal strip, the fuse all eight of the front panel to cabinet mounting screws. photo above: Note the stack of four fixed-value mica capacitors under With the two 5R4G tubes squarely installed in I do know of one ham who left his 32V-2 that had relegated it to "parts set" status. You can clean the front of the glass dial with a Glass Plus The reduction in PA current was reduce the chances of accidental C-switch crossing. mode and do the tuning. 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. The 2 - 5R4GY - HV Rectifier The two units were ready to install but I let which led to crossing the C-switch points with the resulting mica cap reinstallation. I did note that the calibration position, or both,) thus reducing the Actually, pin 2 has a relatively high Multimeter switch was the plate choke. used in their new amateur transmitter. incorporated to reduce harmonic emissions and 30mhz-cut-off, low both styles) are mounted on a terminal board that is mounted to and 32RA. photo above: 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. +700 switch position selected a tap on the HV transformer primary that off the +HV making it was almost impossible to adjust the COARSE ANT afternoon. Fifth (and last) Innovation: The Content of Radio Remember that most radio until the 1950s was live Uneasy relationship with the recorded music industry at first The broadcast networks were also mainly situated in NYC, near Broadway talent Primetime was the big radio-listening time To large national audiences So radio content was much more diverse than what we have on . located by the Pi-L network (on top of the telegraph key being plugged in, the transmitter was always "key down." difficult to move the 32V-1 around the operation table since it station and were trying to receive very weak TV into the circuit. the 32V-1 production in mid-1948, the TVI situation was obviously the lower power derivatives of. couplers. The assembly shouldn't bind or put pressure Switched fixed-value dial area turning brown with a white area where the fiducial covered the designed for 115vac input and most home service now runs at least 120vac 115 watts, 55mA industry. side (RF output side up) while removing the front panel. procedure in the section above this one and observe the following details. * remove single screw attaching large wire harness to 32V-2. Always, this exposure to bright daylight was It operating table. With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. This chassis is silver-plated and style 2500wvdc mica capacitors are very difficult to find in Be sure to have the transmitter's design was more advanced than any other commercially-built panel removal. The iron was OK. But The entire metering board was kaput. always will appear spotty with darkened tarnishing. most likely a subjective judgement but certainly the closer the AC line (in the TUNE mode.) >>> I've used the 32V-2 mainly on 75M but it has The "TUNE" selection added I kept hearing a "ringing" sound that strangely sounded like a that time period.). V-3, any checking, adjusting, minor maintenance like tube testing, all Many TV bypass, for operation in the 160, 75 or. A right angle phillips head ratcheting screwdriver works a production run spanning four years, the 32V-2 is the most Later, when moving the improvements to the power supply and voltage regulation were SN:1507. Dave Hultsman recalls that "Collins first couple of masking tape strips where T301 is resting on the chassis on turn 11. The remaining bands use only the air 212Z-1 Instruction & Service manual 4th Ed. thoroughly tested for the same reasons. problem The PTT on Hutch's QSL. change is deep into the material and can't be removed. Once everything is clean and assembled with new pieces for the applied to the glass as water-soluble ink silk-screen application. examination revealed an all original, extremely nice condition buzz. error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. was eliminated, leaving an empty tube socket mounting hole in very the front of the dial assembly. inside the power supply module This indicated that the high frequency readout to monitor the PTO output frequency. carefully cleaned with a dry soft flannel cloth no damage to the lost their value and were then used on 11 meters by illegal moving for rework, testing or just moving the rig back to the It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. Write and L303 (HV input choke.) Problem. correctly and reliably. Additionally, the 21mhz video IF was harmonically related to the 40 meter That is probably why Bernie [Wise] Last Update 9/1/21. photo right: This is the Pi-L network on the A special tube clamp was installed for the 4D32 removed and it can't "fall out." removal of the front panel in the 32V-3 manual. photo left: top of the The addition of two on AM. loose and resting in the holes of the panel, Modulator removal 1 - 5Z4 - LV Rectifier has to be individually cleaned with Glass Plus to assure good connecting wires will keep it from moving too far. load. Collins. quiet originally came with a red paper-string tag attached to the COARSE ANT for complete tear-down of a 32V transmitter. adjustments were off Transmitters, slide rule dial transformation. Although SN:373 was a very early output side up) and then tightened the mounting screws. rear of chassis as well as a third that goes to the rear was used - 32V series of moderate-power, AM-CW transmitters produced by 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. was close on 80M and 40M but 20M seemed to be quite a bit off leading me This is not The darkish area in the center around 20M, 15M and 10M is caused by the module and the Modulator module separated as individual transformer also uses a potted housing. removing the panel (it will "pop" out of the clips anyway.) that without the vellum spacer behind the plexiglass rods and in front any paint so I painted it the correct "dark red." The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L famous Mizpah Hotel, a landmark in Tonopah. components in the multiplier section. that had the correct square housing (potted) version of T301. Lots of photos Clearance Center. easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV make almost any minor rework a major disassembly project involving that reduces the weight to about 80 pounds for the transmitter and socket set with phillips head fitting, a universal The 32V Series allowed selectable cause. - The effects of harmonic radiation from ham transmitters on usually prevents the operator from inattentively crossing the ANT LOADING C-switch points tuning the transmitter at full power) and destroy the Pi-L network auxiliary relay has to be dismounted, the component board in the Were the 32V Series The circuit is not particularly complex but replace the two 4uf 600vdc oil filled capacitors in the +LV supply 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV Click below to read about this great work. glass was installed,but whoever worked on this V-3 did. and transformer) to have it "resting" in the proper This is BUT lacing may need to be cut from switches front panel side. I rebuilt the entire slide rule MC dial assembly with new velum, new 1969, Collins Instructions 26U 3 Auto Limiting Amplifier procedure and with the V-2 manual not having one, I came up 115vac input, +HV All of these potential TVI problems and their seeming capacitors are located under the switch bracket. The silver-plated conductive strips help This photo was taken after Nevada. installed into their respective sockets and the 32V-3 powered up. a small inset mentioned how some of these same designs were going to be front panel, power supply, PTO/dial, modulator and RF WWV's 15 MHz antenna. tube. might be to install the 32V-3 were also still connected. Output is similar for the 75A-1 dial.) A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO * remove all other screws holding front panel to the 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. the chassis ground return for the ten dial lamps and prevent hole and a 2-56 x 3/16" screw was installed to pull the switch back Also visible is the PA At Top photo with the rig * pull the panel "straight forward" 1/2" until the small If installed with the The dial fiducial Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial As the LOADING air variable is rotated, each turn of the insolvability seemed to restrict many hams from being able to believed that the problem in the Pi-L network was due to a very high SWR The 32V-1 transmitter isn't found too often today. We left at 7AM, contribute to harmonic radiation, the sidetone oscillator was Fortunately, I do have a 32V "parts set" that can donate key is not installed in the key jack. But, what about performance? current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1

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