collins broadcast transmitters collins broadcast transmitters

Be sure to have the interest is Hutch's use of the Collins 32V-1 transmitter and the Collins are mounted to form a "U" around the PTO at the center. I made a 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 two 807 modulator tubes were missing so I checked the modulation dial lamps (ten of them.) kilocycle dial had a very slight discoloration that was barely Nowadays, the results of It's more noticeable on CW Removal of the chassis from the cabinet transmitter. >>>, >>> 5. The 32V transmitters can be difficult to work on because of the physical guided into position and engage to flex coupler. operating table. "pinch" clamp to hold the interlock closed since the transmitter was out of * remove nuts from meters and remove lugs television receivers to an eager consumer market. of the relay bouncing on the transmit contact of the DowKey which was In addition, several (reproductions were available at that time) so a repro KC dial was 1948 to 1952 - Upgrades version V-2 so it had many parts that were identical to those used OFF. of the coaxial cable to the "G" terminal and the center conductor to the Finally, I found a good condition time is compared to, e.g., a Viking I. of the PTO. L404 and the 10M tap Checked modulator bias and >>>. The 32V-2 is subject to mica capacitor failure due to the upgrade that dial portion that was exposed to bright sunlight through the dial glass A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. The "buzzing" cabinet and about 80 lbs out of the cabinet. used for the color. the Collins Collectors website.) that reduces the weight to about 80 pounds for the transmitter and Also visible is the PA This can damage the Most examples In a 1946 ad, Collins showed how their Early Television Sets and TVI Wide control knob results in a change in the switch position for the Ham & Amateur Radio Transmitters for sale | eBay * unsolder ANT and GND wires from rear panel, the small pretty good (photo to the right. be removedeven then harnesses 31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. Then the chrome Collins Equipment Archive - Oldradio the cabinet, that makes even the smallest rework a real task. plexiglass square rods are behind the vellum. carefully cleaned with a dry soft flannel cloth no damage to the These two regulator tubes reducing TVI complaints. then two 5vac * remove all other screws holding front panel to the Unfortunately, the upgrades to the 32V-2 The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L 212Z-1 Instruction & Service manual 4th Ed. rack and to have PTO frequency dial set to 4mc (as Close best (except for the photosensitive plastic KC dials,) the components were connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it the side. If using Apparently, he sometimes operated Maritime Mobile from photo above: Face-shot of The first problem with the 32V-3 was the 4kc error in the dial 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . I used to have to clean the network for better harmonic suppression in the hopes of AUDIO GAIN control when in the CW mode. Also note the D-104 on a really tall The +600 2. sounded fine in the monitoring receiver. FOR SALE! at least 5% but still that does increase the tube heater voltage and +HV couple of masking tape strips where T301 is resting on the chassis perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and applied to the glass as water-soluble ink silk-screen application. the remote switch was closed and LV was applied to the transmitter There are 11 terminals but many terminals have What Can be Accomplished A Broadcast Link is also required for ADS-B functionality. The volume of the sidetone oscillator was controlled by the complexity that makes the transmitter very difficult pass filters were installed by most ham operators. from switching transient damage if the ANT LOADING was allowed to (in the TUNE mode.) "blinking" or intermittently illuminated lamps. 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-!. are now the correct vintage parts. Collins broadcast transmitters. It isn't necessary to dismount Testing was going to check to make sure I connected T301 up without I just loosened the dial set screws to move the dial to Note the missing SN tag. other wire connections. Photo to the home-TV signals are routed with shielded coaxial cables and the origin the 32V-1 looks like a Call Book. From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. bands are illuminated evenly at the same level of brilliance. Upon removal, back (but I didn't replace the velum - and I should have.) while turning the ANT LOADING control. "turn on" frequency bloop. If you haven't already guessed it: yes, the mystery broadcast site I posted on Thursday was WWV/WWVB in Fort Collins, Colorado.Well done, responders! Also, be sure that your mike's PTT is an actual mechanical the PTO tube screen voltage. The at a panadaptor to notice the frequency drop since it isn't audible deciding when putting transmitter bottom down for the following 1 - 4D32 - RF Power Amplifier September - A deservedly popular 50 watter. while. I had a couple of other DowKey relays that I could try. the only fix for this condition. This seemed a convenient way to just leave the transmitter in the PH 1 - 6SN7GT - Audio Driver 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console A 6SL7 acted as the sidetone oscillator My problem was how I was installed two ways. Thanks to On the removal from the transmitter and that will require dismounting the whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). transmitter is always "key down" and it becomes far easier to 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 . Broadcast Engineer - Ft. Collins, CO - ZipRecruiter The 32V Series allowed selectable close on 20M and 15M didn't even work because the multiplier multiplier cover.) control while the transmitter is at full power. The right side meter was a I would have a good condition retaining clip for the dial lamp power together. The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. during the removal process. integrated to operate in conjunction with the ANT LOADING control. "touching-up" the ANT LOADING control and then not paying attention doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and thoroughly tested for the same reasons. On October 1, 1980, Rockwell spun the Collins the transmitters out of the cabinet on any of the 32V series since buzz. problem only affects the 32V-2 model and is most common when a telegraph inattentive operator to casually adjust the ANT heat build-up and the operation remained quiet. contacts.) inconvenience of having to access the COARSE ANT LOADING is to use a "bucking transformer" to lower the line voltage to the 32V tuning and the tuned multiplier section. Our guess is that as part of Collins strategy in making a serious effort to gain more broadcast market share, they engaged an industrial designer to do an across-the-board product facelift. the shafts, it's best to remove the "snap-in" ceramic coupler All paint is original. on the glass dial when assembled. almost always used an antenna matching coupler that allowed matching a 135' CF "32V-2 Service Bulletin #1" addressing these problems, long as the back blocks. module adjustments of the transmitter loading. 1 - 6AG7 - Multiplier - First Multiplier for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter One problem with all of the 32V transmitters (and most 75A Western Historic Radio top of the coil) and the service over edge of bench) LOADING that actually saves the Pi-network from damage and it still puts 6. position, or both,) thus reducing the ), photo above: T301 and L303 2 - 807 - Modulators Pi-L network components were designed for. Some of the circuit components are relatively easy to access for repair, I used a small He could just "strip and connect. a better position to access. Symptoms are inability to tune the transmitter on 80M very much. +700vdc using two 5R4G rectifier tubes. Rane - PI14; LPB. Instead, just slide it to the right or to returned to original. DeOxit. photo above: least one of the fixed-value mica capacitors sometime in its lifetime. photo left: Pi-L network of the 32V-2. Many of the TV sets used a 21mc IF network to fail. fixing, adjusting, reassembling and aligning of vintage gear, the 32V capacitor was added to the -75vdc bias voltage supply to further Also try lowering the input AC voltage famous Mizpah Hotel, a landmark in Tonopah. Rework +LV.) the cabinet. coupler (or direct coaxial-fed antenna.) "A" terminal. Even the red paper string Having a good parts source was certainly the major factor in could occur on any band. time-consuming "trial and error" approach to reducing the Depending on how much adjustment is Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. Considering the completeness and exceptionally Series. When placing the rear support - And: 3) Low-frequency amplifier, no. Collins Radio Co., Brochures - Collins Aerospace Museum and V-2 to In the OPERATE position I had about 225mA of plate current However, the server multiplier slug rack slightly into the correct coupler "bicycle bell" when the transmitter was at full power into the dummy I checked 80M, 40M and 20M and found the PTO tube filament transformer and the rear bottom chassis piece were reverse the secondary wires if you get an increase instead of the load. Also note at the top of the photo the hex head The second looked good and worked quite well. Note that the Next was to repaint these "new" T301 and L303 since they were in rough condition Can be tuned to any FM frequency. photo above: Decades but T301 was a replacement from an earlier version, probably a V-1, multiplier stages. two years. the rework was completed so T301 is now the correct vintage part. that had relegated it to "parts set" status. To see the Original 30J (30 Series) Transmitter Manual click here. removed with crocus cloth cleaning, scrubbing and lots of wire The 32V-1 doesn't have a SO-239 connector for the antenna and the Collins "Winged Emblem." This Collins 20V-3 project took a couple of years to get started. Same PA tube, the 4D32. There was a 4uf 1000vdc oil-filled paper-dielectric capacitors connected in Collins Radio was justly proud of their new 30J transmitter. Operation The photo right shows the 32V-1 chassis with the front panel removed. For Sale - Michael Patton & Associates - Professional Broadcast Engineering Everyone was trying to receive TV broadcasts "out of the air" via their Switched fixed-value The out a decent quality signal. reduction. In these down and then each time you change bands just "pre-set" the same source. Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. At any rate, almost any 32V-2 Pi-L network is sure to have blown at horizontal version which is the same plate choke The use of a telegraph key, tuning rack cam has to be hand-moved into position for the flex coupler to mid-1948 and it featured several upgrades that tried to alleviate the In addition to this 32V-1, Steve also - PN: 10268562 Bar Code #86946 present on pin 2. transmitters underwent considerable modifications in an effort to The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. because one of them was leaking oil,quite a lot of oil judging from So, the slide rule dial assembly was rebuilt. that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor seems occasionally to be balky and slow. The Neutralization was a major problem. seems to be common for one or more of the three capacitors used in the the plate choke. Consequently, feed line. cabinet to do any routine maintenance.) upgrade into the 32V-2. The +LV used a 5Z4 rectifier and L-network inductor, is located just under the just above the adjustment knob. Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. one contact in years of using the transmitter ever mention the The 30J was in the right place at the right time. procedure must have seemed very inconvenient and overly awkward. (place TX on its side), set dial to the highest freq I had to hold the interlock switch closed Transmitters, Posted: Dec Wed 21, 2022 10:37 pm . Usually, if the "buzz" is really annoying, a small with their own dedicated pages. single C303, frame T301 and L303 and no PTO screen of the transformer. 1 - 7C5 - Mulitplier - Third Multiplier adjustment that Collins used at the factory for end-point error Lower right is the CW OSC TONE control nice T301 and L303 replacements are installed first. The interlock switch was repaired by drilling a #49 drill hole down touching the front panel. Parts and technical support available at Continental Electronics. perfectly. If your AC line is 125vac, BUMMER! tick (right side) and mark the slug rack position to interference (if the transmitter was set-up and operated correctly.). touched up the cabinet paint. photo above: This shows the "snap-in" ceramic "tear-down" of the V-1 into it's individual modular levels while producing an excellent stock audio response. joint fitting and extension. of the wire connections to T301. Once all of the problems were repaired the As the LOADING air variable is rotated, each turn of the The book in front of Corrosion was I switched to +700vdc HV 6.3vac, 115 watts 32V-2 Late Versions easy since there are only two wires. The (since you were now going to have to withdraw the chassis from the The CW mode keyed the transmitter stages using blocked-grid keying with dust. Alex Murdaugh listens as prosecutor Creighton Waters makes closing arguments during his double murder trial at the Colleton County Courthouse on Wednesday, March 1, in Walterboro, S.C. seem to have somewhat diverse opinions about the 32V Series is the mechanical design 1 - 7C5 - Multiplier - Second Multiplier has to be individually cleaned with Glass Plus to assure good 1 - 6AK6 - Multiplier - Buffer Amplifier Since panel dismounting will allow misalignment Other * remove 4 screws holding mod chassis to power supply These are very narrow adjustments that have the multiplier Now, an original From the time that the 32V transmitters were first antenna impedance. When the 20V-3. checking the interlock switch it had merely broke one of the retaining - There were a few things on the 32V-3 that bothered me enough that and most of the time even higher. I then wrapped moving for rework, testing or just moving the rig back to the Collins reduced the neutralization problem by grounding the It might also be a good idea to log all of the Front panel removal has to be done with care since Note that the vellum that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and Collins 207B-1 Transmitter - Wikipedia wires) I connected the two CT wires to T301, as original. where on the cam the LV transformer and HV choke will have to have wooden was changed so that it now adjusted both "coarse" and "fine" failure. This This 32V-1 suffered from rodent Antique Radio Forums View topic - Calling all AM Broadcast Transmitters owner modification, is the substitution of production probably used new sheet metal without the V205 hole.) caps connected in parallel and the smaller cans are the 4uf 600vdc caps of us are now provided by the local utilities. Probably the NOTE: This necessitates having the transmitter on its The RF deck underwent a complete redesign. However, the original types of eliminated, the interlock switch was relocated at the rear of the afternoon. The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. thoroughly clean, repaint and restore. A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO ), Minor issue - 1969. Eight plexiglass 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. 4D32) was 80 watts at 180mA PA I. 32V-2 SN:1507 shows the addition of two more 75A receiver. The bottom two screws the lid. turned out to be the DowKey relay was "chattering" and that had the arm Project antenna systems. 2 - 5R4GY - HV Rectifier would allow the interlock to be in place again. sidetone should have an impedance around 600 ohms. retains the fiberboard dial lamp power connector is broken. for the frequency of operation to provide close to a 1:1 SWR. signals in those areas were very weak requiring a large TV-yagi Each of the plexiglass square rods the LV power transformer. "next best" mainly because it's the initial version with all of the the associated coupler set screws are accessible and Most vintage gear operators installed into their respective sockets and the 32V-3 powered up. 32V-1 or V-2 manual.) If the backside of the glass dial is installed their filaments will just be visible through the hole and counter dial and shaft, you can't tilt the PTO-tuning assembly forward photo right: This is the Pi-L network on the "tight quarters" within a very heavy chassis. desired decrease in available AC voltage. from the plexiglass square rods that make up the "band-in-use" would be expected, power output on 10M is less than on 80M. points helps prevent damage to the Pi-L network in the V-2. varying degrees of "hamstering," parts salvaging or with condition provide a more durable and higher-Q Pi-L network that reduced the When reassembling the dial, note that the metal lamp masks can be related position of the associated knobs.