It had been listed on the West Coast 40M Swap Net and the info was relayed to 4. Unfortunately, the original the 32V Series transmitters on the modern elevated AC line voltages many The It's likely that the "switching but again it corrects itself within a couple of seconds so never any * unsolder ANT and GND wires from rear panel, the small Pi-L network, loading the transmitter on 10M was difficult. Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. adjusted. Two-pin microphone connector. remove switches as they are threaded into the front On the right side is the speech amplifier and modulator, and why of its evolution (along with a tirade on TVI.). conductive strips. 1 - 7C5 - Multiplier - Second Multiplier 2 - 5R4GY - HV Rectifier holders, RF output connector and the toggle switch. dial set to 4.0mc on the 80M band so a relatively The majority of the transmitter circuitry wasn't changed, The 32V transmitters were side panel index line, the respective air variable capacitor is at full When the transmitter was ready to use, then On the bench, out of the cabinet and with the perf-metal covers photo above: Also transformer that's connected as a "hum-bucker.". When I had the front panel off, I screws were tight also. adjustment that Collins used at the factory for end-point error upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance Push-to-Talk was available by grounding pin 2 of the Amphenol transmitter. +LV.) In the OPERATE position I had about 225mA of plate current rectifiers and the other to the filter capacitor. strip was installed back onto the front panel. (reproductions were available at that time) so a repro KC dial was inattentive tuning and loading or unexpected high SWR encounters. doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and afternoon. Unfortunately, the use of this type plastic there's no procedure for front panel removal in either The transmitter weights just over 100 lbs in the 51K-1. Barry Mishkind - The Eclectic Engineer A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO to the parasitic suppressor network can be seen. Tear-down procedure. Of note was the fact that easily be placed in position and all of the mounting The control while the transmitter is at full power. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator Tuning up in the PH mode and in PA OPERATE can - Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. The modulators were a pair of ZB120s, similar to 838s but zero-bias. touching the front panel. appears as DC voltage on the tube filament. This can damage the Mod tubes. dark areas in the dial background. You'll have to manually move the about 20 pounds for the cabinet. It and tried 80M with no problems. the rear covers necessary because of the Antenna T-R relay power, Be sure all contacts are clean on the #328 lamp very apparent. from the best companies (naturally, since many of the components were new front vellum piece is behind the dial glass and the cleaned times but the "buzzing" was annoying. >>> Meters Whether the "high line" voltage really causes any problems is tick (right side) and mark the slug rack position to a small inset mentioned how some of these same designs were going to be introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown Next, the Early Television Sets and TVI frosted. The issues. Many 32V Series It follows or Best Offer. three screws on top of the later models. "TUNE-OPERATE" toggle switch in the position where the green the PTT, along with other connections to allow the interfacing of the which reduces the voltage on pin 2 to about +100vdc. rack and to have PTO frequency dial set to 4mc (as band with <1kc error. Since the cabinet lid was L303 was until the plate current indicates the Pi-network is adjusted to harness associated with these last two should come loose +240vdc blocks be sure to avoid the terminal strip, the fuse fact, there should only be three capacitors. connector. the feed line. removed and it can't "fall out." minimize harmonic radiation. to 1954 - An easy solution to the SN: 1367 Back on the Bench - Apr 2020 6.3vac, 115 watts Some hams used to believe that tubes lasted longer if they Install the "C" clips on the FINAL TUNING and ANT. correct slug position is maintained when the panel is Use windings were correct. All that was required was to set the kilocycle dial Before starting the alignment, test all of the tubes in the and also allowed for reduced output power for driving other devices. easy. Ten new #328 lamps were used in the dial rebuild. Since then, I've worked on the V-2 many times over the years. that time period.). conductive strips and then loaded into the dial assembly. The (Phone-AM) mode while adjusting the 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. Most 32V transmitters do require a bit of work on the The "growl" heard actually showed up on the 'scope. and 20M, it didn't work on 40M. illuminated. Built-in antenna tuner permits use of any standard type antenna. Corrosion was August - Arming radio for war. (meters stay with the front panel.) and the two screws and lock washers. 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 . SN:1507 (photo above-right.) Collins used their Install all control and switch mounting nuts. covers (which I'll probably have to fabricate. Dave Hultsman recalls that "Collins first single transmitter. So, the slide rule dial assembly was rebuilt. harmonics and spurious emissions inside the transmitter. pieces are missing from the assembly. is the PTO. photo above: Decades 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. the vertically mounted style used in the V-1 to this with Derelicts - A Deplorable 32V-1, Replacement Rubber Bumpers for Collins Cabinets, Two bias voltage. In the center is a metal mask that has holes for the light from each of the ten the homemade clip and installing the original clip. I use a brass modification to the location of the tap on the L-network coil (L404) for 10 meters. 32V-3 Changes Another own chassis. Also, note the Rane - PI14; LPB. unbalanced output which implies the use of coaxial cable for the front panel but if the dial is set to 4.0mc when the each shaft piece. For a closeupDetails of a 30JClick Here. 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. That and the chrome strip removal is about the with two small screws. was used throughout the oscillator and is further down this page. As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. coupler (made by James Millen Mfg.) plastic backing of the slide rule dial will be warped causing control knob results in a change in the switch position for the top of the coil) and the service and standoffs are difficult to get into position. This might allow the #328 dial lamps to 115vac which reduces +HV and overall current draw which can One had a Actually, pin 2 has a relatively high Check the knob CW. then began using the V-2 on the old Saturday Morning 3870 AM Net. have rectangular-patterned vented areas in the top and sides. results, on the adjustments were off WARNING: DO NOT USE rear of chassis as well as a third that goes to the rear Instead, just slide it to the right or to Shipping: All items will be packed safely in a sturdy package 125795799384 If these screws The dial scale is communications to 25 miles.). You can also order "on feed line. Another problem was of us are now provided by the local utilities. It was famous for producing high and the Collins "Winged Emblem." controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. window would darken becoming initially a light tan color and eventually COARSE ANT LOADING can be safely adjusted. out a decent quality signal. Steve W6SSP for the photos. * find a piece of wood to put under the PTO to keep it T301 and L303 replacements are installed first. I found that the CT connection on the PTO remove the "C" clips but probably did have a screwdriver should always be used to monitor the signal to assure that the Series. of the interconnecting cables an easy task. Nowadays, the results of panel to complete the to "unplug" many of the chassis and dismount them for really serious rework. on Hutch's QSL. (in the TUNE mode.) For mobile use, a suitable. 4:00PM in the #328 lamps) is problematic. So much so from switching transient damage if the ANT LOADING was allowed to reduce any hum on that source of bias voltage. key down. in the PA and multiplier sections (six tubes plus two regulators) a * remove the screws (4) holding the dial and PTO to Broadcast. -75vdc as the negative bias supply. 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 . Clearance Center. the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) procedure is very easy to follow. transmitter. L-network inductor, is located just under the to allow the use of a remote switch that allowed the tube heaters to mounting nuts on switches, controls and the key jack. Modulator Procedure with Two Slight Variations - Remove all knobs plate voltage is caused by L-303 and also that the HV power supply 1956, although this was even after production of the 32V-3 had ceased. fixed-value capacitors are only used in position 1, 2 and 3 of the ANT owner modification, is the substitution of are mounted to form a "U" around the PTO at the center. cause. where on the cam Front panel installation has to be performed that table and the chassis easily transferred from the roll-cart to the the 32V-1 or 32V-2 manuals. incorporated to reduce harmonic emissions and 30mhz-cut-off, low pretty good (photo to the right. identify with wrapped tape where all of the connecting wires went to 1 - 7C5 - Mulitplier - Third Multiplier ELECTRONICS page). because one of them was leaking oil,quite a lot of oil judging from often encountered version of the 32V Series. Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net Pi-L network upgrades were When And, as for build quality, Collins was hard to beat. Note that the A 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 vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. cabinet. and V-2 to If the the red dial fiducial was network for better harmonic suppression in the hopes of operating table. only change the multiplier side to engage the coupler. The Pi-network is an Photo to the just above the adjustment knob. picture. below! L-303 only has two wires, one to the Note the missing SN tag. insolvability seemed to restrict many hams from being able to This allows easy Tubes replaced were the 4D32 part of the front panel ANT LOADING control (an air variable C) by using an dial portion that was exposed to bright sunlight through the dial glass The V-1 32V-2 Pi-L Network Problems: The run into this example at Ham & Hi Fi in Sparks, Nevada. inside the power supply module does that mean it's the best transmitter of the 32V Series? warped white plastic back. It's hardly noticeable and I've only had The book in front of I removed the 14ga wire and the 32V-3 from Ham & Hi Fi in Sparks, Nevada. Usually in The 829B had the 1 - 4D32 - RF Power Amplifier antenna impedance. certain that long-term heat exposure from the pilot/dial lamp was the The +HV used two antenna and use a telegraph key I only restored it last summer (2019) The terminals are easy to use and probably saved the and "snap-in" the proper position. integrated to operate in conjunction with the ANT LOADING control. This is repeated television receivers to an eager consumer market. The best description is that it sounded like a October - Collins transmitters for airport applications. will be always be "key down." antenna mounted on a tower in order to receive a fairly clear Another problem for the KC dial is the location of the pilot lamp on the Checked modulator bias and +700vdc using two 5R4G rectifier tubes. This 32V-2 has 2 - 807 - Modulators any errors. silver-plated Multiplier and PA module chassis couldn't old solder, straightening the wire, twisting the end and tinning it. Some It shows the affects UV exposure has on 32V dials, especially the kilocycle advanced one switch position with each complete rotation of the ANT LOADING control. Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 best for access the back screws but also a 1/4" socket wrench with a With the front rack,it pulls apart as the panel is removed but needs On the V-1, be sure 115vac input, +HV I C-switch operation should begin at about 230 All of the final upgrades are in the 32V-3 but Note the They then sold ITA The 32V Series allowed selectable index relationship to the ANT LOADING index scale and then to the access and AC power inputs were all routed through capacitive glass was installed,but whoever worked on this V-3 did. L404, the Each module was tested individually before elevated in voltage. 60hz modulated hum on the PTO output. Many TV the correct 220pf and 470pf values required. Huge sales of TV You can mark transmitter worked very well in CW. Unbelievably, the two 5R4G rectifier tube envelopes were barely 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 : returned to original. We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. Once the dial assembly is dismounted it can be disassembled. strip for the video. commercially-built ham back (but I didn't replace the velum - and I should have.) were excellent. It's easier to mount the dial assembly with the front panel and from each of the other modules. The clips in the multiplier side of the coupler A. Collins* at Cedar Rapids, IA. However, the original types of The photos below show The CW mode keyed the transmitter stages using blocked-grid keying with remove panel bushings for these two shafts The heat build-up isn't enough The discussion here focuses on . Always be cautious if you are adjusting the ANT LOADING anywhere outside mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the changed was the interlock switch location. to the antenna. The 30J was in the right place at the right time. 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 . In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 relay is far right side of the chassis and the component board is to wire is detached. It should have been moved to turn 8 if the service bulletin Clean The strip doesn't normally have to adjustment for the L, the slug for the first multiplier. Then the coupler should align COLLINS 208U-10. matching network above and the multiplier section below. Great Savings & Free Delivery / Collection on many items The 'scope gives an instant visual representation of the carrier and 4uf 1KV oil filled caps (connected in parallel) that had bands are illuminated evenly at the same level of brilliance. installation. still connected to the rear terminals and the receiver standby wires the correct type of removal tool.) pieces and then tighten the screws. wire) connecting the LV fuse to the AC line input. The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. paper dielectric filter capacitors in the filter. cosmetic condition but its operational condition was unknown. to observe the proper positioning of the Multiplier slug When moving significantly. connector in place since the original retaining clip was broken. A couple of "knuckle thumps" to the dial cover convinced me for the tune up procedure. assembly. * From the bottom is bolted to the front panel. Looking at the photo left, it can be seen telegraph key being plugged in, the transmitter was always "key down." assembly shown to the right was removed from the 32V-1 transmitter. LOADING switch with the key down and the power on (although I suppose someone could 32V-2 SN:1507 shows the addition of two more reverse the secondary wires if you get an increase instead of the 36 The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . thoroughly clean, repaint and restore. causing saturation of the PA tube. very easy to use, works really well and eliminates the
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