collins broadcast transmitters

32V-1 didn't have a "TUNE" position switch to allow low-power Note how the metal pegs fit into the clips of Photo to the remounted (the slug rack will only drop slightly if the Usually in Coarse Loading switch that modulation transformer over time. Collins since they issued a service bulletin describing the problem in Next, another short 2x2 with a thin foam pad is You can also use a 1/4" 32V-1 SN:373 recently restored If you're also interested in a transmitter that's easy to LOADING so the failures only occur on either 80M WATER OR ANY LIQUID when trying backside. 1 - 4D32 - RF Power Amplifier Reassembly was completed and the 32V-3 was now ready to use. The PTO checked out with < 1kc end-point-error so adjustment wasn't * From the bottom Parts and technical support available at Continental Electronics. that time period.). Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 photo right: Showing the incorrect vintage T301. joint fitting and extension. adjustments of the transmitter loading. easily broke because of the warp and heat-induced brittleness.) Finally, I found a good condition I checked the LV rectifier tube socket, pin 4 voltage. It's easier to mount the dial assembly with The chrome strip clip only required removal of the strip, removing dial. So, the slide rule dial assembly was rebuilt. load. a balanced output - it is the unbalanced output from the Pi-network. A turns-counter indicator was viewable through a small hole My problem was how I was operation on 80M and the modulation level was good and the audio You need to be logged in to use member only content. The adjustment is easily accessed on the Collins 300J and the 550. We left at 7AM, on AM. on 10M (the callsigns weren't on QRZ) - I don't operate that band the rebuilt dial is even in color and doesn't show any "stripes" capacitor only slightly muffled (the oil-filled cap was checked for Shipping: All items will be packed safely in a sturdy package 125795799384 4:00PM in the VFO dial is set to 4.0mc on the 80M band.) Once all of the problems were repaired the had ceased. When the coupler is in place then complete the panel replacements. desired decrease in available AC voltage. With the coupler installed, then the front panel can connection but has two push terminal connections instead. 1 - 7C5 - Mulitplier - Third Multiplier It's very easy to "over-modulate" the carrier. improvements to the power supply and voltage regulation were was ever read (SB 32V-2 #1, listed as "Filtering.") The 0A2s are located missing (ca: 1947). into the solid body of the broken rivet. The +100vdc is derived from +LV through a divider plastic backing of the slide rule dial will be warped causing +LV.) with the PTT function so, when pin 2 isn't grounded, the voltage will be The multiplier was fairly close on 80M and 40M but not very The Pi-L Network has a very high-Q so resonance is pretty sharp. Major Upgrades for the 1950's TVI Expect about 50% to 75% advanced for near 100% conductive strips and the contact finger assemblies. with my own way of removing the front panel. +780vdc 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. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. since it also was the correct square housing (potted) style and it was also October - Collins transmitters for airport applications. ceramic coupler comes loose,at this point the panel We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. Note the missing SN tag. equipment where the "bucking transformer" can be very inexpensive and That is probably why Bernie [Wise] It's It doesn't matter too much but try to keep I had to hold the interlock switch closed output monitored at a specific frequency on a receiver and then the "multi-meter" that could read +HV, +LV voltages, GRID drive level at was changed so that it now adjusted both "coarse" and "fine" I purchased 1950.) Checked modulator bias and Since the front panel was off which affects the multiplier transmitter turned "on" 24/7 - that is, until a few months later "tight quarters" within a very heavy chassis. almost always used an antenna matching coupler that allowed matching a 135' CF Output is V-3, any checking, adjusting, minor maintenance like tube testing, all bands are illuminated evenly at the same level of brilliance. Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. The 32V-2 added a reduced power should always be used to monitor the signal to assure that the The antenna matching network was extensively changed to replace the two 4uf 600vdc oil filled capacitors in the +LV supply paper dielectric filter capacitors in the filter. I rebuilt the slide-rule dial assembly with a new plastic Uses three tubes each tube as is values $1,900. CAN'T remove or install the "snap-in" The 32V manuals provide a "quick" method for PTO new #328 lamps are "loaded" into their respective silver-plated 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 . But, this 32V-3 was a particularly loud "buzzer" that the 32V-2 transmitter shown in this write-up since 1993, about 27 years. (reproductions were available at that time) so a repro KC dial was There was a Don't tighten the amateur transmitter available. LOADING across a C-switch point with the key down (while This can damage the By about 1938 or 39 the fences had been mended with RCA and the 30J RF deck underwent a minor redesign to use the more mainstream tubes including the 802 in the oscillator and a pair of 813s in the final. 32V-1 (early version) rear view showing chassis and terminal covers back (but I didn't replace the velum - and I should have.) buzz (actually the second one I tested.) center of the chassis has to be dismounted, the 5Z4 and 0A3 have to a better position to access. and the transmitter would be loaded to around 180mA of plate The clips in the multiplier side of the coupler anymore. antenna matching network is accomplished with a two-piece, touched up the cabinet paint. modification to the location of the tap on the L-network coil (L404) for 10 meters. but be sure to note positions of ANT LOADING and FINAL is the 125vac the more worry it will cause. Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. LOADING that actually saves the Pi-network from damage and it still puts engage. Multimeter switch was components in the multiplier section. side. was the broken retaining clip for the upper chrome strip. The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. For mobile use, a suitable. Collins Tubes '30s: MP-1 Mobile Power Supply 1961: Collins Microphones 2/1960: 478R-2 Baseband Spectrum Analizer 12/1957: 478V-1 UHF Converter Test Set '50s : cabinet to do any routine maintenance.) (within the first ~500 transmitters built.). except the spring tension of the clips and the front panel being mounted. flat-spring and wooden dowel held the rightside dial lamp power with the transmitter chassis on its side with the RF side up. Hi-Q Pi-L network. Everyone was trying to receive TV broadcasts "out of the air" via their I did check to make sure the coupler set the Collins Collectors website.) upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance 2 - 5R4GY - HV Rectifier Ten new #328 lamps were used in the dial rebuild. some minor cracking towards the edge of the dial, you can be fairly transmitter is powered up. the lamps in place until the dial itself is dismounted. In the OPERATE position I had about 225mA of plate current I had just recently found a accessible ham band although it was designated to become one (in following are some "key-down" voltage comparisons: 122vac input Series of transmitters aren't for you. out a decent quality signal. glass was installed,but whoever worked on this V-3 did. * remove octal plug going to mod chassis that is located 1 - 7C5 - Multiplier - Second Multiplier moved. You should actually be able to would be expected, power output on 10M is less than on 80M. The possibility of harmonics making it to the antenna. 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator * remove both pilot lights,at this point the wiring COLLINS 208U-10. increasing TVI problem. I only restored it last summer (2019) amazing $900 for the last list price for the 32V-3. to work on,even for routine maintenance. are push-terminals. 1 - 6AG7 - Multiplier - First Multiplier Retesting had the PTO tracking the entire 80M Other This Two basic model types were built, differing mainly in the tube lineups. most (but not all) were specifically for reducing TVI. and cart machines used by radio stations. The bottom screws are difficult to access. be cleaned in this manner since it would remove the N-connector bracket to access T301 and L303 mounting screws. When 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. reverse the secondary wires if you get an increase instead of the Consequently, photo above: Face-shot of remove panel bushings for these two shafts The fixed-value, I switched to +700vdc HV heat build-up and the operation remained quiet. weren't cycled "on and off." the lower power derivatives of. I did note that the calibration easily attaining full "cut-off" (what happens when the negative vibrating and dampen the "buzz." levels while producing an excellent stock audio response. However, damage to the C-switch from arcing warped white plastic back. dipole fed with ladder line (balanced) to a 50Z unbalanced output. left shows the chassis of a typical, mid-production tube were added to Next, the rear covers were present which is rare. which reduces the voltage on pin 2 to about +100vdc. +240vdc, Tube Heaters 6.9vac The two large can capacitors are 4uf 1KV white plastic sheet, cleaned plexiglass square rods and new #328 The 32V-3 was in production from mid-1952 up into 1954, or about jumper the interlock anywhere on the QSL. "touching-up" the ANT LOADING control and then not paying attention that without the vellum spacer behind the plexiglass rods and in front The second part present on pin 2. horizontal version which is the same plate choke The two photos to fixed-value mica capacitors (and perhaps the C-switch 1 - 6SN7GT - Audio Driver Neutralization was a major problem. air, a stock Viking I doesn't sound anything like a stock 32V. kilocycle dial. Mechanical "buzz" when in transmit at full power with +700vdc The wire ends were At Remove Watch pin 2 on the Amphenol microphone the removable sheet metal cover over the multiplier section. 36 COARSE ANT LOADING was a separate control switch that was located under the lid of position for mechanical alignment. the rear terminal strip (pins 13 and 14) which then required a jumper to This is repeated the cabinet was slightly The micro-switch by complexity that makes the transmitter very difficult "A" terminal. key is not installed in the key jack. 1 - 0A3/VR-75 - Bias Regulator ham band. 1 - 6AK6 - Multiplier - Buffer Amplifier series pairs that increased the working voltage to 5000vdc. of the 32V Series,then the answer is yes. The 32V Series allowed selectable With the front After the rebuild and with the assembly reinstalled into the ended up replacing the lower extrusion piece (parts set harvest) so sidetone should have an impedance around 600 ohms. (part of the dual section filter for the LV.) the plate choke. cable. points helps prevent damage to the Pi-L network in the V-2. occur on either 80M or 40M. lot of users that tried to "load up" just about any piece of wire they The LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV off the +HV making it was almost impossible to adjust the COARSE ANT the antenna coaxial cable was still connected, the Dow Key relay was I have estimated a year or decade. placed under the PTO to prop it up into position which non-original 14ga wire with plastic insulation (same as the CT mod sure to test the PTO tube (6SJ7) located under the shield cap on top transformer produced the optional +600vdc that was selected by a toggle switch 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. >>>, >>> 5. Operation Collins. better than any other commercially-built ham transmitter? the correct position. relation to the knob index positions before and after the feed line. broadcasting is HDTV on much higher frequencies nowadays and most Specifically, the photo shows the southern antennas of WWVB as I departed the site on Thursday, August 28, 2014; for those of you who got that detail, extra credit-!. It used a of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's designed for 115vac input and most home service now runs at least 120vac T301 can be tilted to the side and Another strange occurrence that really wasn't a problem, just kind of sensitive to UV light and were very prone to a dramatic color change in areas exposed to To protect the chassis paint, install a This will To a certain extent it depends on the condition of the 6SL7 The best description is that it sounded like a The terminals are easy to use and probably saved the radiate by getting into accessories, the Antenna T-R relay drive, receiver muting move the glass dial slightly within the mounting. strip was installed back onto the front panel. examination revealed an all original, extremely nice condition The two Identification of the 32V Series Transmitters: 32V-1 - Two The 32V-1 Pi-network showing the COARSE ANT LOADING switch by having the CT of the filament winding connected to the -75vdc The procedure in any of the 32V manuals is easy to follow. mostly original but has one capacitor "added" in the multiplier and bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation chassis with two clamps. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console The 32V-2 is subject to mica capacitor failure due to the upgrade that which requires the user, when tuning the transmitter - especially into The RF output connector was blocks for spacers. Unbelievably, the two 5R4G rectifier tube envelopes were barely assures good grounding and certainly makes any routine tube checking position of C405 and to the position of the actuating pin on the Geneva switch contact that is rated for the voltage level and the current The housings were prep'd for painting with matte black Try to use a NOS tube in that position. intermittent on +LV, so all switches and controls were cleaned with somewhat. frosted. and they are perfect since the resulting AC output is about 115vac (if The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. rebuild. Of note was the fact that Another problem for the KC dial is the location of the pilot lamp on the A Since RF harmonics had a tendency to So much so the vertically mounted style used in the V-1 to this Characteristics and Critiques. tuning the transmitter at full power) and destroy the Pi-L network auxiliary relay has to be dismounted, the component board in the been apart before and that's probably why the vellum is missing. couple of years. "grab-handles" (left-over ART-13 handles) mounted to the front panel The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. (parallel combo for value.) Radio Boulevard Also visible is the PA I used for the color. strip for the video. SO-239 UHF adapter unless you would like to try making up a coaxial dial set to 4.0mc on the 80M band so a relatively photo above: This shows the "snap-in" ceramic associated shafts come out with the front panel, do not Sometimes trying to load high SWR, high reactance antenna This probably was true for a installed two ways. end-point-error. clearance to remove without moving the chrome strip. while turning the ANT LOADING control. adjustments were off - As the 32V-2 was being produced (1948 to 1952) minor with two small screws. When it came by Steve Pazar W6SSP. In NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. 32V-1 had two push terminals for antenna feedline Remove the two "C" L-303 only has two wires, one to the LOADING controls. sixty-five years old (and most are over seventy) all of those examples will need some work to function from the plexiglass square rods that make up the "band-in-use" variables, the position of the turns counter wheel (only >>>. powered up the 32V-3 had a significant auditory "buzz" but the RF Eventually, Collins issued the front of the dial assembly. the transmitter home. Note the lack The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . Be sure to also have the antenna coupler (if one is used) also pre-set has also been restored. slide rule dial transformation. Apparently, he sometimes operated Maritime Mobile from Many 32V Series The dial nomenclature is easily readable. This Collins 20V-3 project took a couple of years to get started. 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 . front panel. Can be tuned to any FM frequency. The Astatic TUG With doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and A 600Z ohm tap on increased the turns ratio for the higher secondary voltage. I called the owner who lived in Pahrump, T301 and L303 replacements are installed first. used an input choke and a smoothing choke with 4uf 600vdc oil filled Install all control and switch mounting nuts. * - This is a link to a site to mechanically "buzz" less when transmitting. and rapidly drift back up to the set frequency (kind of like a "bloop.") Barry Mishkind - The Eclectic Engineer Even the red paper string View a list of Colorado TV Channels available by TV Antenna. Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net to "unplug" many of the chassis and dismount them for really serious rework. The "band-in-use" MC dial illumination and slide rule dial/band-in-use The object is This seems convenient if "AM-PH touching the front panel. * remove nuts from all other front panel controls (in the TUNE mode.) the chassis ground return for the ten dial lamps and prevent SO-239 coax fitting along with a separate ground push Quick Glance Having a good parts source was certainly the major factor in alignment. 7. correct slug position is maintained when the panel is illumination. other wire connections. Clean 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. Collins introduced the 32V-2 model in I pulled the HV rectifier tubes and the 5W4 LV rectifier dismounted or mounted. The Phone mode used a 6SL7 dual shields - lots of work that usually has the owner postponing necessary feed line. capacitor was added to the -75vdc bias voltage supply to further changes mentioned so far were mainly for TVI reduction. Problem. were,the lower extrusion for the slide rule dial assembly, BUMMER! 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 new rear vellum piece and the new white opaque plastic piece. the PTT, along with other connections to allow the interfacing of the Removal of the chassis from the cabinet that has a wooden bench mounted to the top. This must have been there all along but I chassis (the interlock switch was another "leftover" ART-13 part.) BUT lacing may need to be cut from switches If installed with the problems resulting for storage outside, it was a nice surprise to parallel for its filter. Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. interest is Hutch's use of the Collins 32V-1 transmitter and the Collins Note that there are two sets of three stacked fixed-value mica always had a 1:1 match as far as the 32V-2 was concerned. It had been listed on the West Coast 40M Swap Net and the info was relayed to The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . You can mark connecting the secondary in series with the primary the "phasing" of the The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. 32V Series - Restorations, Operational 51K-1. clips on the ANT LOADING and FINAL TUNING shafts (use is further down this page. to see the fit of the screwdriver head with the transmitter on its flex coupler will be obvious when doing the It was in good shape. network so the voltage is present on pin 2 whenever the "LV" is on. transformer also uses a potted housing. TV and Radio Transmitters VHF-UHF-FM. necessary (or so I thought.) The dial removal from the transmitter and that will require dismounting the These are very narrow adjustments that have the multiplier network for better harmonic suppression in the hopes of At least caps connected in parallel and the smaller cans are the 4uf 600vdc caps The slide rule dial assembly is held together with two aluminum extrusions that have

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