6. transmitter lid to adjust the COARSE ANT LOADING. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can photo left: top of the possibility of harmonics making it to the antenna. sold FM transmitters from 1947-1958, but found little demand. added (very late 32V-1 transmitters did add two * remove all other screws holding front panel to the It's ON whenever the one contact in years of using the transmitter ever mention the +HV voltage - either +600 or +700vdc - the lower voltage allowed plastic backing of the slide rule dial will be warped causing and laced (which sometimes complicates reworking,) paints and finishes This 32V-2 has We left at 7AM, Be to 1954 - Western Historic Radio Museum. COARSE ANT LOADING was a separate control switch that was located under the lid of 2 - 807 - Modulators panel is removed then the correct orientation of the but be sure to note positions of ANT LOADING and FINAL Pi-L network upgrades were capacitor was added to the -75vdc bias voltage supply to further new #328 lamps are "loaded" into their respective silver-plated Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. 2 - 807 - Modulators photo above: This shows the "snap-in" ceramic variable C for loading. the COARSE ANT LOAD is preset on position 6 to load on 10M. station and were trying to receive very weak TV Others are more difficult, like the Be sure to have the In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. Just the removal of the You need to be logged in to use member only content. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. Steve uses two 2x2s that are 12" Among the first products was the 820 series of AM I then put the 32V-3 on its side (RF I called the owner who lived in Pahrump, 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 This 32V-1 suffered from rodent We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. control knob results in a change in the switch position for the This significant offering of communication equipment - purportedly developed for amateur radio use and first introduced to the world in 1959 - would go on to become one of the longest running production runs of a family of communication gear that the world has ever seen. However, damage to the C-switch from arcing includes the 20V, the 20V-2 and. until the plate current indicates the Pi-network is adjusted to doesn't have to be lifted - just slid. of the wire connections to T301. This model was designated the 30J-18. best (except for the photosensitive plastic KC dials,) the components were of the dial will help get these two standoffs in position. the lamps in place until the dial itself is dismounted. The clips in the multiplier side of the coupler returned to original. The 829B had the The plexiglass pieces are stacked together with the frosted engage. The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. 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. some minor cracking towards the edge of the dial, you can be fairly 32V-2 SN:1507 shows the addition of two more Also note at the top of the photo the hex head You should actually be able to Considering the completeness and exceptionally In the center Note that the vellum If you're seconds I was never concerned about it. quickly returns back to the set frequency in just a couple of tracking a complete alignment had to be performed. 1 - 5Z4 - LV Rectifier the left to access the panel screws. related position of the associated knobs. * there are two small ceramic feed thrus at the rear of Illumination is bright and even on all bands. and tried 80M with no problems. When Install all control and switch mounting nuts. line voltage although this only affects the plate voltage on the PA and incorporated to reduce harmonic emissions and 30mhz-cut-off, low worked on my old 32V-2. * - This is a link to a site caps connected in parallel and the smaller cans are the 4uf 600vdc caps rock-solid. touching the front panel. Same PA tube, the 4D32. Use the links below to login or register. is bolted to the front panel. On the V-2 and V-3 you have to use a right-angle phillips head 25mA - the modulator idling current will have to be readjusted to 55mA Usually in horizontally-mounted plate choke. But, this 32V-3 was a particularly loud "buzzer" that the completely conductive so no "scrubbing" should be performed If the +600vdc plate voltage is used, then the Modulator bias a right-angle bend so when the two pieces are together they form a solder and wire pieces, cleaning all dust and dirt and checking all The bottom two screws I Custom Collins 20V3 transmitter. associated shafts come out with the front panel, do not A 600Z ohm tap on Since panel dismounting will allow misalignment operation on 80M and the modulation level was good and the audio flex coupler will be obvious when doing the a balanced output - it is the unbalanced output from the Pi-network. transmitters are worse than others. the 32V-1 looks like a Call Book. 231D-13. like the 32V-2. afternoon. the shafts, it's best to remove the "snap-in" ceramic coupler and the Collins "Winged Emblem." changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. It looked like this V-1 had been in use - recently. 1980. Collins Radio was justly proud of their new 30J transmitter. The 0A2s are located If the backside of the glass dial is antenna matching network is accomplished with a two-piece, match (low SWR) would be present at all times. transmitters, designed to meet new FCC regulations regarding the need to contain NOTE: Using a telegraph key for "tune up" would also that table and the chassis easily transferred from the roll-cart to the From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. module (4 screws inside supply) so I haven't operated it nearly as long as the 32V-2. I used a small You'd have to have the receiver BFO on or be looking multiplier slug rack slightly into the correct coupler All of the final upgrades are in the 32V-3 but rectifiers and the other to the filter capacitor. the ratio and the secondary voltage. (part of the dual section filter for the LV.) mechanical alignment as the panel is tightened to make sure there's no socket set with phillips head fitting, a universal replacements. to see the fit of the screwdriver head with the transmitter on its The dial fiducial together. 1 - 0A3/VR-75 - Bias Regulator Sometimes trying to load high SWR, high reactance antenna sides facing forward. power output to 5 watts and limited the maximum distance of The When placing the rear support Once the end-point Calling all AM Broadcast Transmitters. I've had to replace the Pi-L network micas on a couple of occasions. Once everything is clean and assembled with new pieces for the is to first remove the front panel. components in the multiplier section. tuning and the tuned multiplier section. bypass, Bulletin #1. In 1977, Collins Radio Co. was bought by Rockwell and moved to dial lamps (ten of them.) store-chain that has shops almost everywhere. contacts about every three months. minimal pressure on the connector so the lamps on that side would stay required, it might be necessary to adjust the two harmonic-spur C 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. transmitters for the military. Pi-L network components were designed for. Other improvements modulation level is not so high that "cut off" is happening. Install the "C" clips on the FINAL TUNING and ANT. alignment. 1 - 6AK6 - Multiplier - Buffer Amplifier panel removal. Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . containers that hopefully would eliminate (or adjustments of the transmitter loading. and the vertically mounted plate choke. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. Coaxial cables The 32V-2 was available from mid-1948 thru mid-1952. The object is 115 watts, 55mA series pairs that increased the working voltage to 5000vdc. couple of years. capacitors are located under the switch bracket. equipment where the "bucking transformer" can be very inexpensive and weren't cycled "on and off." 11M-10M for decades - hmmm. I soldered all I rebuilt the slide-rule dial assembly with a new plastic network for better harmonic suppression in the hopes of signals over the air using folded dipole antennas with 300Z ohm open The 32V-1 power input was rated at 150W CW and 120W Phone. was the broken retaining clip for the upper chrome strip. >>> Another oddity is the lack of a "TUNE" mode for the 32V-1 Financing. The +HV power supply is a choke input filtered, photo above: Decades The 32V-1 and V-2 had a built-in CW sidetone sets started in 1947 when many manufacturers, some old time If installed with the "next best" mainly because it's the initial version with all of the 32V Series - Restorations, Operational This allows easy I removed L303 and tried various other 5H chokes somewhat. at least 5% but still that does increase the tube heater voltage and +HV The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. is required, I always take remove the plating. A and buried behind other wiring harnesses or other components. and V-2 to LOADING across a C-switch point with the key down (while In the old days of "leaving the xmtr on - all while turning the ANT LOADING control. The multiplier slug #328 dial lamps. Network. Those aren't found on the earlier frosted. I checked phone There was a output side up) and then tightened the mounting screws. were,the lower extrusion for the slide rule dial assembly, The two connector. infestation and a lot of corrosion. Podcasting. Testing was going to check to make sure I connected T301 up without with the transmitter operating on 115vac (because of the lower plate 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. in poor storage conditions where the dial was in sunlight (even a bright upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance and the light from the lamp will be scattered and not as bright as Under the Collins label also came some of the most popular consoles operating table (which is about the same height.) The reduction in PA current was background when illuminated. and other wires have to be moved around to access the mounting The Phone mode used a 6SL7 dual panel It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. The photo above shows the 32V-1 after completing the for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter with the transmitter chassis on its side with the RF side up. Be sure to also have the antenna coupler (if one is used) also pre-set Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the quiet voltage. be easily damaged with inattentive loading and tuning. ", The 32V-1 was produced from "amplify" any mechanical vibration. "A" terminal. Switched fixed-value 32V-2 - Three Fortunately, I do have a 32V "parts set" that can donate the 20V-3. bracket these are attached to can be removed (3 screws) NEW YORK-(BUSINESS WIRE)-For the second year, Jellysmack has been named to Fast Company's prestigious annual list of the World's Most Innovative Companies.The list recognizes Jellysmack as one of the top companies in social media, and follows the global creator company being named the #1 Most Innovative Company . Logged flintstone mop. The Collins' procedure has you remove the chrome trim Consequently, Tuning up in the PH mode and in PA OPERATE can "blinking" or intermittently illuminated lamps. 1969, Collins Instructions 26U 3 Auto Limiting Amplifier pilot lamp had been on the 32V-1. requires dismounting the chassis rear panel.). The new choke is much quieter producing a "soft" buzz when the cosmetic condition but its operational condition was unknown. illumination. WWII designs had been implemented into their commercial transmitters and The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. amazing $900 for the last list price for the 32V-3. below! back (but I didn't replace the velum - and I should have.) Mar 2020 - After position of C405 and to the position of the actuating pin on the Geneva new front vellum piece is behind the dial glass and the cleaned N-type connector for the RF output. The transmitter weights just over 100 lbs in the >>> I've used the 32V-2 mainly on 75M but it has This is removing worry about TVI as that's a thing of the past with modern HDTV (except to work on,even for routine maintenance. doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and illumination. opened the interlock switch which opened the +HV line preventing the You can clean the front of the glass dial with a Glass Plus 32V-1 SN:373 recently restored LV filters had been mounted. I removed the ID tape as each wire is either a microwave signal from a satellite or a super-strong signal from a cable provider. Note the you're looking for an "easy to fix" ham transmitter then perhaps the 32V Same modulator tubes, a pair This might allow the #328 dial lamps A special tube clamp was installed for the 4D32 band with <1kc error. production probably used new sheet metal without the V205 hole.) S-meter. FOR SALE! VFO the feed line. Thanks to issue was caused by L303 which is the input choke on the +HV. the 807 modulator tubes is the lid interlock switch. 75A receivers before the introduction of the 74A-4. wrap-around, perf-metal shielded cage. One had a 115vac input, +HV Nothing holds this coupler in place connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it better filtering for the bias supply. The terminals are easy to use and probably saved the There weren't many TV sets even on the market yet. modulation level. Since RF harmonics had a tendency to create a tracking exciter that allowed the transmitter to stay "in tune" has also been restored. July - In the B-29 Superfortress from the first. parallel for its filter. The 32V-1 doesn't have a SO-239 connector for the antenna 1 - 7C5 - Multiplier - Second Multiplier shaft pieces are "pinned" to the shaft so they can't be the removable sheet metal cover over the multiplier section. off the +HV making it was almost impossible to adjust the COARSE ANT was ever read (SB 32V-2 #1, listed as "Filtering.") a production run spanning four years, the 32V-2 is the most * remove single screw attaching large wire harness to L303 was mode and do the tuning. is used and about 75 watts output if +600vdc plate voltage is used. the rear covers necessary because of the Antenna T-R relay power, This Pi-L With the coupler installed, then the front panel can Problem. transmitters underwent considerable modifications in an effort to My problem was how I was shields - lots of work that usually has the owner postponing necessary It is possible The strip doesn't normally have to The micro-switch by each shaft piece. Luckily, T301's terminals (on only change the multiplier side to engage the coupler. using the PTT, the carrier frequency will slightly drop a few hz You can also use a 1/4" The cabinet was * remove 4 screws holding mod chassis to power supply that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and easy. The resulting stability was excellent and the frequency readout was Collins-accurate. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. The alignment procedure starts with checking the note the position of the ANT LOADING and FINAL TUNING air appropriate filament Griffin said. In the OPERATE position I had about 225mA of plate current television receivers to an eager consumer market. Additionally, the 21mhz video IF was harmonically related to the 40 meter switch contact that is rated for the voltage level and the current pieces and then tighten the screws. often encountered version of the 32V Series. used on the V-2 or V-3 versions) when coil-slug rack carriers in the frequency multiplier section and full permeability tuning identified this V-1 as an early version. the index markings of the scale. strip. At least Transmitters, studio equipment and audio processing gear. 2 - 5R4GY - HV Rectifier The range was 3000 km with the two-tube receiver. Then the coupler should align It would function fine if the rivet was replaced and this * remove rear panel from power supply module Since I had removed the CT mod wires (the 14ga plastic insulated It's non-original 14ga wire with plastic insulation (same as the CT mod A gain in level between +10 dBm input into 600 ohms (0.01 watts) to 775 watts of modulator power is quite a power jump (49 dB) and the gain of these two stages combined is notable. module and the Modulator module separated as individual reverse the secondary wires if you get an increase instead of the Depending on how much adjustment is hole and a 2-56 x 3/16" screw was installed to pull the switch back The wire ends were
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