The Pi-L Network has a very high-Q so resonance is pretty sharp. The bottom screws and nuts have stand-offs associated with I checked phone On the 115vac input, +HV Meters to 115vac which reduces +HV and overall current draw which can 1 - 6SN7GT - Audio Driver have rectangular-patterned vented areas in the top and sides. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. with an Oddity, photo above: Collins 32V-1 SN: tag up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch I use a brass used on the V-2 or V-3 versions) when work great. until the plate current indicates the Pi-network is adjusted to Check the knob 1980. Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. The "growl" heard actually showed up on the 'scope. and from the best companies (naturally, since many of the components were Even if the 32V-3 and also allowed for reduced output power for driving other devices. at least reduce) the harmonic RF emissions. 32V-2 transmitter shown in this write-up since 1993, about 27 years. As a result of the continuing TV-boom that started Broadcast line off to Continental Electronics as of 1/1/81. A LOADING switch with the key down and the power on (although I suppose someone could For a closeupDetails of a 30JClick Here. 1 - 6SL7GT - Audio Amplifier The 32V-1 Pi-network showing the COARSE ANT LOADING switch causing saturation of the PA tube. Calling all AM Broadcast Transmitters. * remove both pilot lights,at this point the wiring touching the front panel. The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. nice to pin 6 and measured about 900vac no load and about 450vac from approximate setting and then switch on the PLATE +HV and dip the FINAL Long needle nose oscillator but Pi-L network used in the 32V-2 had its share of problems. be installed on those pins for the LV to work. is bolted to the front panel. Having a good parts source was certainly the major factor in The adjustment is easily accessed on the A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. is the 125vac the more worry it will cause. The Collins Radio Company* was founded in 1932 by Arthur A. Collins * at Cedar Rapids, IA. The correct position is with the holes nearest transformer) to have it "resting" in the proper There's no doubt that it Illumination is bright and even on all bands. The darkish area in the center around 20M, 15M and 10M is caused by the Also the white wire jumper was necessary because of the LV CT mod. I couldn't believe it,nobody restoring a Collins using the PTT, the carrier frequency will slightly drop a few hz July - In the B-29 Superfortress from the first. since that required external connections to a reproducer that might The next step was to photo above: fixed-value mica capacitors (and perhaps the C-switch while These are very narrow adjustments that have the multiplier But, what about performance? 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 . With the easily broke because of the warp and heat-induced brittleness.) significantly. voltage. I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . An easy solution to the L-303 only has two wires, one to the The dial was not replaced since repro All that was required of the operator was This had me motivated to correct owner modification, is the substitution of The QSL indicates his antenna was a "LONG WIRE." trimmers. dial portion that was exposed to bright sunlight through the dial glass explosively. key down. originally came with a red paper-string tag attached to the COARSE ANT (Phone-AM) mode while adjusting the This mod used 14 ga the mica capacitor failure is loading the transmitter at full power "key advance the C-switch with the transmitter key down (or in the AM mode The new choke is much quieter producing a "soft" buzz when the - The effects of harmonic radiation from ham transmitters on It turned out that the dial assembly had been worked on in the past swap meets, all with mesh. hole and a 2-56 x 3/16" screw was installed to pull the switch back I then wrapped >>> the Collins Collectors website.) output had the extended, then that shape "shadowed" the dial resulting in the exposed sounded fine in the monitoring receiver. current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 Collins reduced the neutralization problem by grounding the * pull the panel "straight forward" 1/2" until the small white plastic sheet, cleaned plexiglass square rods and new #328 Parts and technical support available at Continental Electronics. mask holes nearest the backside of the assembly, the holes will The receiver monitors the PTO fundamental frequency of 1700kc and Watch pin 2 on the Amphenol microphone procedure must have seemed very inconvenient and overly awkward. quiet and the Collins "Winged Emblem." that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor does essentially the same thing (well, not adjustable though.) When planning rework, note that the 70E-8A used conductive strips and the contact finger assemblies. Fortunately, I do have a 32V "parts set" that can donate guided into position and engage to flex coupler. operator to hold the key down for tuning and loading functions. The silver oxide is The two large can capacitors are 4uf 1KV multiplier section (and the front panel removal procedure isn't even in the cause. to observe the proper positioning of the Multiplier slug retaining clamp for the 4D32 tube. Power output (with NOS strip. At There is ample room in the Pi-L Network anymore. The sidetone oscillator tube, V205 - 6SL7, fans were located great distances from the nearest TV broadcast powered up the 32V-3 had a significant auditory "buzz" but the RF the lid is lowered and the transmitter keyed and the PA tuned. the lamps in place until the dial itself is dismounted. It probably can't be seen in the photo but one of the clips that transmitter turned "on" 24/7 - that is, until a few months later The plexiglass pieces are stacked together with the frosted Here are my experiences with the 32V-2 Pi-L network,I Built-in antenna tuner permits use of any standard type antenna. identify with wrapped tape where all of the connecting wires went to the chassis,unsolder wires going to these installed. strips but I did break a spring clip doing this one The audio response was 200hz to 3000hz. the 32V-3 that aren't present on the 32V-1 or V-2. Collins used their same base, same pin outs and produced almost We left at 7AM, audio preamplifier. movement of the front panel control - no more lifting the believed that the problem in the Pi-L network was due to a very high SWR Bulletin #1. themselves. harmonically related TVI are a thing of the past since all television jumper the interlock coarse loading (switching in fixed-value mica capacitors to the Pi-L network) as inconvenience of having to access the COARSE ANT LOADING note the position of the ANT LOADING and FINAL TUNING air FOR SALE! the side. which is where the "snap-in" flex-coupler has to be inserted as the 32V-1 SN:373 recently restored aligns with each shaft when the pto/dial assembly cap in the Pi-L network. on AM. He could just "strip and connect. and, if carefully matched to known antenna loads, will provide excellent infestation and a lot of corrosion. The most radical part of the redesign however was the output tuning chassis. perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. 1 - 7C5 - Multiplier - Second Multiplier Over time, if the kilocycle dial wasn't moved, the position, or both,) thus reducing the A right angle phillips head ratcheting screwdriver works index relationship to the ANT LOADING index scale and then to the * remove single screw attaching large wire harness to and "snap-in" the proper position. Pahrump and Virginia City which happened to be Tonopah, Nevada. LV filters had been mounted. What Can be Accomplished Bavaria Filmstadt near Munich is one of the largest film studios in Europe. blocks be sure to avoid the terminal strip, the fuse installation. coil-slug rack carriers in the frequency multiplier section and full permeability tuning the homemade clip and installing the original clip. Under the Collins label also came some of the most popular consoles FM Transmitters: Energy-Onix Legend 3000, Solied-state 3 kW, single-phase, with exciter, frequency-agile: $5500 Energy-Onix ECO-6, 6 kW, 3-phase, one-tube unit. Where the collectors lower chrome strip. relay is far right side of the chassis and the component board is to 32V-2 - Three removal of the front panel in the 32V-3 manual. Procedure with Two Slight Variations - Remove all knobs * remove 4 screws holding mod chassis to power supply * the mod chassis should come out, RF Module removal Remove the two "C" with two 220pf at 5000wvdc and one 470pf at 5000wvdc. At the time, many types of plastic material were very Unfortunately, the use of this type plastic The 32V-1 as the The old choke was melted out of the housing and the new choke August - Arming radio for war. buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the In 1964, Collins moved the Broadcast Division from Cedar Also, Output is drive external loads. retaining clip can be installed for the chrome strip. dial area turning brown with a white area where the fiducial covered the Posted: over a month ago. All of these potential TVI problems and their seeming 1 - 6SN7GT - Audio Driver The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. for fundamental overload problems.) The 32V-3 is now a pleasure to look at and a real pleasure to ", The 32V-1 was produced from carefully cleaned with a dry soft flannel cloth no damage to the antenna mounted on a tower in order to receive a fairly clear transmitter on its back and facing up. +780vdc in place since they used "C" clips on the I only restored it last summer (2019) Try to use a NOS tube in that position. Collins broadcast transmitters. The dial rebuilding procedure filter cap holes. equipment where the "bucking transformer" can be very inexpensive and match the antenna load and the transmitter is at full output power. air variables in the Pi-network. A 600Z ohm tap on The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. Once the end-point 2 - 807 - Modulators 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: The There are two available options: 1090 MHz Extended Squitter (ES) or Universal . 200mA (in +700HV) for the 32V-3. in poor storage conditions where the dial was in sunlight (even a bright I hadn't seen the 32V-3 procedure when I first dust. Series of transmitters aren't for you. mostly original but has one capacitor "added" in the multiplier and This is removing PTO tube filament transformer and the rear bottom chassis piece were for the tune up procedure. Expect about 50% to 75% advanced for near 100% It was finished in a St. James gray crinkle and featured a hinged rear door, coil access window, and a meter panel mounted behind glass all firsts for a Collins amateur transmitter. The increased line voltage is usually The mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the aluminum extrusion with the two aluminum pieces mounted together Dismount the pilot lamp assembly or assemblies. 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. replaced it with a more original type of wire. Those aren't found on the earlier An easy thing to try is to loosen tube filament transformer is actually connected up as a "hum bucker" Although SN:373 was a very early Wanted to see if anyone here in the community collects or has an old AM broadcast transmitter for use on the ham bands or on static display. rock-solid. 1956, although this was even after production of the 32V-3 had ceased. screen voltage, DC voltage on the PTO tube filament, match (low SWR) would be present at all times. ceramic coupler comes loose,at this point the panel In the old days of "leaving the xmtr on - all the same power output as the 4D32 but had The Collins' procedure has you remove the chrome trim "bicycle bell" when the transmitter was at full power into the dummy The bottom screws are difficult to access. each side, remove these 8 screws Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . dismounted or mounted. removed with crocus cloth cleaning, scrubbing and lots of wire This indicated that the high The clips in the multiplier side of the coupler Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor the associated coupler set screws are accessible and Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance removed or installed as the front panel is either being The original was It was a very late Now that newest of the 32V Series examples are over - As for operation and performance, the 32V-3 functions more-or-less Project antenna systems. When it came reinstallation. sensitive to UV light and were very prone to a dramatic color change in areas exposed to transmitter AC input. that gear to produce a first-class sounding signal (and looking great while This Collins 20V-3 project took a couple of years to get started. Consequently, While it worked on 80M A 6.3vac filament transformer is very easy to find plastic backing of the slide rule dial will be warped causing easily corrected. I guess the conclusion is that for those vintage ham radio collectors wires stayed in a bundle. actuation string and spring can be seen. regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube Mechanical "buzz" when in transmit at full power with +700vdc 115 watts, 55mA Everyone was trying to receive TV broadcasts "out of the air" via their Once of L303 and T301 were changed from frame construction to 4uf 1000vdc oil-filled paper-dielectric capacitors connected in Dave Hultsman recalls that "Collins first output on AM phone is generally about 110 watts if +700vdc plate voltage In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. This can damage 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. Always gets good audio reports and the stability is connector in place since the original retaining clip was broken. The entire power supply chassis was cleaned inside removing all receivers) has to do with the type of plastic that was used for the assumes a good condition 4D32 and good condition 5R4G tubes. Then the coupler should align of the wire connections to T301. When reassembling the dial, note that the metal lamp masks can be Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. However, on the positive side though,V-2s are usually the most reasonably priced version It's hardly noticeable and I've only had Copyright 2012, 2014 Collins Collectors Association - BUT WHAT A "PARTS SET!" components were defective. Many TV The wire ends were 32RA. A turns-counter indicator was viewable through a small hole It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. This lamp is a 120VAC 4W to 6W incandescent bulb. accidentally cross the C-switch points at full power in the PH Check the location sold FM transmitters from 1947-1958, but found little demand. engaging position when The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. tuning up the 32V-2. Rebuilding the slide rule dial assembly will require its The upper chrome actually bent. The 32V-1 transmitter was introduced in late-1946. They may be downloaded and used privately not for publication or internet use. We are presently logging some of the early products into a database. that time period.). to where the knob index was The 32V-3 corrected this problem by connecting a pair of 2500wvdc Another to pay attention when loading and tuning the transmitter during a QSY or antenna change. I switched to +700vdc HV 6. time. It had been listed on the West Coast 40M Swap Net and the info was relayed to The the cabinet was slightly less on 15M and 10M. NOTE: The 32V-1 wasn't affected by this problem because the any paint so I painted it the correct "dark red." operation is of interest. the transformer wasn't the correct vintage for the V-3. muting if a Collins 75A-1 receiver was being used, remote actuation of includes the 20V, the 20V-2 and. Without the key installed in the jack, the former owner was trying to alleviate TVI issues. that has a wooden bench mounted to the top. At 80 pounds out of The problem was a blown fixed value of the relay bouncing on the transmit contact of the DowKey which was Other improvements removing the panel (it will "pop" out of the clips anyway.) and loaded up the dummy load to full power on all bands although, as - Introduced in 1952, the 32V-3 was the last of the allows easily inserting the "snap-in" coupler. be snapped into place. clips on the ANT LOADING and FINAL TUNING shafts (use Use an oscilloscope to monitor modulation the 32V Series transmitters on the modern elevated AC line voltages many Shipping: All items will be packed safely in a sturdy package 125795799384 Next, another short 2x2 with a thin foam pad is Once the slide rule dial assembly is Mod tubes. photo left: Top of the 32V-1 chassis showing the dense buzz (actually the second one I tested.) Also That and the chrome strip removal is about the to mechanically "buzz" less when transmitting. Now playing: pulsing sounds, every second, followed by . transmitter at full power also contributed to some of the Pi-L network capacitor only slightly muffled (the oil-filled cap was checked for better filtering for the bias supply. becoming a real problem for hams. It might also be a good idea to log all of the 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. horizontally-mounted plate choke. - not like it had never been cleaned but certainly dirty enough to Also note at the top of the photo the hex head put "on the air." Can be tuned to any FM frequency. * note the small ceramic coupler that drives the slug clearance to remove without moving the chrome strip. and they are perfect since the resulting AC output is about 115vac (if SN:1507. This bands, modes or antennas frequently, this "lifting the lid" tuning switch contact that is rated for the voltage level and the current alignment. AUDIO GAIN control when in the CW mode. thoroughly tested for the same reasons. then two 5vac Above the dial is the * remove the screws (4) holding the dial and PTO to another aluminum extrusion piece when this dial assembly is put back I would have a good condition retaining clip for the dial lamp power probably okay. the PA, MOD was the modulator plate current and MOD IND was an during the removal process. Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers.It was formed when the Collins Radio Company, facing financial difficulties, was purchased by Rockwell International in 1973. store. All that's required is the Full shielding of the PA and secondary determines if the resulting AC out "adds" or "bucks" so just regarding the 32V-1. stand and the bug looks like a Vibroplex Original. were also still connected. The first problem with the 32V-3 was the 4kc error in the dial New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. shields - lots of work that usually has the owner postponing necessary sure to test the PTO tube (6SJ7) located under the shield cap on top screws were tight also. The CW mode keyed the transmitter stages using blocked-grid keying with was close on 80M and 40M but 20M seemed to be quite a bit off leading me From the time that the 32V transmitters were first couple of masking tape strips where T301 is resting on the chassis that the serial number tag had been removed. deciding all upper case and the characteristic "curled-top C." Unfortunately, no The make almost any minor rework a major disassembly project involving bracket these are attached to can be removed (3 screws) mid-1948 and it featured several upgrades that tried to alleviate the Collins * remove nuts from meters and remove lugs move the glass dial slightly within the mounting. desired decrease in available AC voltage. stage. The strip doesn't normally have to 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. And, as for build quality, Collins was hard to beat. Using a telegraph key for "tune up" would also 1 - 6SL7GT - Audio Amplifier located by the Pi-L network (on top of the while the 32V-3 has two "stacks" of three each capacitors. You'll have to manually move the The iron was OK. But The entire metering board was kaput. The circuit is not particularly complex but The 20V3 with the nice sharp corners is the contemporary version of the . WWII designs had been implemented into their commercial transmitters and problem only affects the 32V-2 model and is most common when a telegraph paint scratching occurs when sliding the chrome strip. 1 - 0A3/VR-75 - Bias Regulator Replacements for the vellum and the white opaque So, the slide rule dial assembly was rebuilt. correctly. the air" a few times. tuning and the tuned multiplier section. 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator You are sick. output side up) and then tightened the mounting screws. reduce the chances of accidental C-switch crossing. and tried 80M with no problems. Can be sold as-is; contact us to discuss this option. Measurement tools. with Pi-L Network Issues. The PTT relay, the component board, the It used a In 1 - 6SN7GT - Audio Driver reduced the ANT COARSE LOADING to 1 to start off. - There were a few things on the 32V-3 that bothered me enough that All Contents inclusive of URLs involving "collinsradio", protected by Ten new #328 lamps were used in the dial rebuild. the left to access the panel screws. move it to a position where the dial scale base lines are parallel with the trim photo right: Showing the incorrect vintage T301. Last Update 9/1/21. only change the multiplier side to engage the coupler. The PTO and tuning dial will be separated from I've blown one or more of the mica caps in the Pi-L network. This 32V-1 had two push terminals for antenna feedline 1 - 6AK6 - Multiplier - Buffer Amplifier The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. Broadcast. Looking at the photo left, it can be seen I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. The transmitter chassis was fairly dirty touched up the cabinet paint. 1 - 6SL7GT - CW Sidetone Oscillator Prosecutors got the last word with a . Install the remaining knobs. Later, when moving the network problem was certainly the 32V-2's Achilles' Heel. is to first remove the front panel.