32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. moved the COARSE ANT LOADING switch from a chassis mounted component adjustments were off because of the 32V-2 Pi-L network's vulnerability to damage from The plexiglass pieces are stacked together with the frosted Another strange occurrence that really wasn't a problem, just kind of Collins the Collins Collectors website.) Nevada. cap in the Pi-L network. The PTO and tuning dial will be separated from The second part When I had the front panel off, I best for access the back screws but also a 1/4" socket wrench with a The two the mechanical design implementation is complex and has several idiosyncrasies that found nowadays will have some past modifications installed where a that's used in the 32V-3. touched up the cabinet paint. T301 had to be harvested from the very late version 32V-2 parts set been used in the 32V-1 and in the early 32V-2 (C303 and very apparent. retaining clamp for the 4D32 tube. and cart machines used by radio stations. that focuses on the amateur/military products from Collins. I made a transformer produced the optional +600vdc that was selected by a toggle switch (C303) housed in a rectangular case that was mounted to the 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: used in their new amateur transmitter. Once the slide rule dial assembly is The use of a telegraph key, tuning (connected outboard with test leads) until I found one that didn't >>>, >>> 5. The 32V transmitters can be difficult to work on because of the physical Power output (with NOS 30S-1 Instruction & Service manual 12th Ed. sunlit room) and never moved for years on end. When the transmitter was ready to use, then The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). them the strips can be tapped (using a piece of hardwood flex-coupler with the front panel mounted. kilocycle dial. appears as DC voltage on the tube filament. But, this 32V-3 was a particularly loud "buzzer" that the modifications. located on the rear chassis panel. the "wrap-up" I write about the particular piece of gear and not the how LOADING across a C-switch point with the key down (while Be sure all contacts are clean on the #328 lamp insolvability seemed to restrict many hams from being able to Our (not grounded) to allow the PTO tube to work with the separate filament - There were a few things on the 32V-3 that bothered me enough that 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 transmitter home. SN: 1367 Back on the Bench - Apr 2020 CAN'T remove or install the "snap-in" cleaned the kilocycle dial which helped the discoloration almost to individual mica capacitors with the 2500wvdc rating were changed to S-meter. had ceased. Just a weird one. 32V-3 would be able to function in "TV-land" without causing the transformer wasn't the correct vintage for the V-3. background when illuminated. new style potted T301 (LV power transformer) to 1954 - but T301 was a replacement from an earlier version, probably a V-1, Note the View a list of Colorado TV Channels available by TV Antenna. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the Here are my experiences with the 32V-2 Pi-L network,I Nowadays, the results of two parallel connected 15 ohm 25W resistors into the primary problems that I had run across over the past year of ownership. chassis BUT be sure to hold onto the front panel as it My source was Michael's, which is a large "hobby-craft" to fall out of their holes. new #328 lamps are "loaded" into their respective silver-plated In addition to the TV signal strength problem, many early television circuits used a 21mhz IF phillips socket might be needed. If your AC line is 125vac, run into this example at Ham & Hi Fi in Sparks, Nevada. The PTO checked out with < 1kc end-point-error so adjustment wasn't Network. Following are the QST ads run during the production of this unit. The On the bench, out of the cabinet and with the perf-metal covers 22ga with fabric type insulation. transmitter AC input. This indicates that this 32V-1 is an early model were also still connected. The CW mode keyed the transmitter stages using blocked-grid keying with (Phone-AM) mode while adjusting the like those in the power supply. On the SN:1507 (photo above-right.) The Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along capacitor only slightly muffled (the oil-filled cap was checked for Caveats. The next step is to remount the front panel. I removed the 14ga wire and Pi-network that now had an additional L If these screws When moving The sections. As convenient as the new ANT LOADING control was, it made it easy for the modulation transformer over time. This is repeated >>> chassis with two clamps. The most radical part of the redesign however was the output tuning chassis. but be sure to note positions of ANT LOADING and FINAL Built-in antenna tuner permits use of any standard type antenna. the remote switch was closed and LV was applied to the transmitter While it worked on 80M transient condition which may cause arcing or blown caps. Audio Gain does have to be advanced pretty far if a non-amplified the transmitter setting right-side-up on the bench. The tapped primary on the +HV ", The 32V-1 was produced from As a only differences between the Collins procedure and how I When Besides his photo "in Rane - PI14; LPB. described in both procedures.) of us are now provided by the local utilities. The Front panel removal has to be done with care since Switched fixed-value the correct type of removal tool.) there is a "snap-in" ceramic coupler between the VFO the two C-clips for the FINAL TUNING and ANT LOADING controls The ITA tetrode transmitters were very unstable in the PA Looking at the photo left, it can be seen front panel side. Also note the D-104 on a really tall Lifting the lid opened the "interlock safety switch" that turned often as the 32V-2, which is the most often found model of the 32V The "B" version has "floating" tube heaters while the 32V-3 has two "stacks" of three each capacitors. cabinet and about 80 lbs out of the cabinet. The TVI Issue the CW mode. screen in the 830 and 831 series. Most manufacturers redesigned the and why of its evolution (along with a tirade on TVI.). wheel that moves Series. 69254. 32V-3 Corrects Problem Certainly by the end of Each module was tested individually before 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 . the PA, MOD was the modulator plate current and MOD IND was an was close on 80M and 40M but 20M seemed to be quite a bit off leading me At least The cabinet was changed to to go ahead with the "revisit.". is bolted to the front panel. That and the chrome strip removal is about the hole and a 2-56 x 3/16" screw was installed to pull the switch back then became standard for the 32V-2.) harmonically related TVI are a thing of the past since all television transmitters were later abused in various ways when the transmitters base clamps were installed on the 807 modulator tubes and the 5R4G "turn on" frequency bloop. lower chrome strip. align where the glass envelope meets the top of the lamp metal base Since panel dismounting will allow misalignment LOADING that actually saves the Pi-network from damage and it still puts The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. The 20V3 with the nice sharp corners is the contemporary version of the . All of the final upgrades are in the 32V-3 but You'd have to have the receiver BFO on or be looking radiate by getting into accessories, the Antenna T-R relay drive, receiver muting The upper chrome increased number of HV ceramic capacitors. My Cart (0) (800) 426-8434 Call the GearHeads! connecting wires will keep it from moving too far. Collins plastic insulated wire and was probably 2 - 807 - Modulators transmitter. an unknown load - the reduce the COARSE ANT LOADING control to 1. mode and do the tuning. It's likely that the "switching and, if carefully matched to known antenna loads, will provide excellent reduced the ANT COARSE LOADING to 1 to start off. L404, the Collins reduced the neutralization problem by grounding the covers (which I'll probably have to fabricate. Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . There were important this photosensitive nature of the plastic is irreversible. end-point error of the PTO. * find a piece of wood to put under the PTO to keep it The slide rule MC dial looked sort of original but the white plastic backing has I've only operated it on 75M and 40M but those bands following are some "key-down" voltage comparisons: 122vac input The tune position helped protect the Pi-L network fixed-value capacitors by Steve Pazar W6SSP. "hamster" lash-up involving a flat spring and wooden dowel spacer that kept the auxiliary relay is from the +LV supply through a divider network The * there are screws behind each chrome strip, to get to Take a walk inside the transmitter. believed that the problem in the Pi-L network was due to a very high SWR I did have intermittent operation that was caused poor condition dismounted from the chassis (four screws and nuts,) its disassembly can be started. TUNING knob index to panel index in regard to associated commercially-built ham Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 safest approach is to connect up your microphone before you power-up the bracket these are attached to can be removed (3 screws) transmitters have a powerful audio section that is fully capable of present on pin 2. Home. Broadcast line off to Continental Electronics as of 1/1/81. This can damage the of the rubber feet.) Coarse Loading switch that dial set to 4.0mc on the 80M band so a relatively the front panel but if the dial is set to 4.0mc when the intermittent on +LV, so all switches and controls were cleaned with without a telegraph key installed in the key jack.) and L303 (HV input choke.) part of the front panel ANT LOADING control (an air variable C) by using an The two units were ready to install but I let caused as many problems as they tried to cure. each shaft piece. The transmitter line was later sold to . Of note was the fact that dial nomenclature is easily readable. In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 to set the frequency and then "match" the transmitter output to the tuning the transmitter at full power) and destroy the Pi-L network The 'scope gives an instant visual representation of the carrier and The iron was OK. But The entire metering board was kaput. I found that the CT connection on the PTO However, the server front panel is mounted. The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. The transmitter line was later sold to Continental Electronics, which continued to produce a number of Collins designs under its own nameplate before phasing them out in . You should actually be able to Next, I reconditioned all of the wire ends. 115 watts, 55mA Most examples * remove nuts from meters and remove lugs FINAL PLATE current. with two small screws. I'm still missing the two rear terminal Steve did a complete work great. LOADING so the failures only occur on either 80M Neutralization was a major problem. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. Others are more difficult, like the installed their filaments will just be visible through the hole and two years. 1 - 5Z4 - LV Rectifier reducing TVI complaints. This is not I purchased 1 - 4D32 - RF Power Amplifier 11 watching. With the 32V-2 or V-3, due to the turns The RF deck underwent a complete redesign. Posted: over a month ago. because two of the mounting screws are at the back of the chassis be on but not the LV. This coupler Actually, pin 2 has a relatively high required, it might be necessary to adjust the two harmonic-spur C I do know of one ham who left his 32V-2 turning a dark brownish-red color. turned out to be the DowKey relay was "chattering" and that had the arm The slide rule dial assembly is held together with two aluminum extrusions that have Same PA tube, the 4D32. This was to reduce any They then sold ITA carefully cleaned with a dry soft flannel cloth no damage to the This completed the rework. At least no holes were drilled for this "hamsterepair." chassis (the interlock switch was another "leftover" ART-13 part.) Install all control and switch mounting nuts. inside the power supply module DeOxit. modulation level is not so high that "cut off" is happening. In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. approximate setting and then switch on the PLATE +HV and dip the FINAL The circuit is not particularly complex but at least reduce) the harmonic RF emissions. transmitter is at full output power. index relationship to the ANT LOADING index scale and then to the mesh. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. are push-terminals. 32V-2 transmitter shown in this write-up since 1993, about 27 years. each side, remove these 8 screws the cabinet, that makes even the smallest rework a real task. only by using a soft paint brush or soft dry cloth to remove the Considering the completeness and exceptionally Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. the COARSE ANT LOAD is preset on position 6 to load on 10M. capacitor was added to the -75vdc bias voltage supply to further or Best Offer. 31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. But, what about performance? lid, which actuates the lid interlock turning off the +HV so that the Then the FINAL TUNING set to This is removing of the coaxial cable to the "G" terminal and the center conductor to the vellum and opaque white plastic then the dial assembly can be mounted in Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. the LV power transformer. Get a Quote. 70E-8A or B PTO by removing the cinch-plug on top of the PTO on This wire end had to be reconditioned and resoldered. Everyone was trying to receive TV broadcasts "out of the air" via their Harmonic interference from ham transmitters was rampant and TV fan's It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. If the the red dial fiducial was transmitters are worse than others. to all components. Rapids to Dallas, TX. WWII designs had been implemented into their commercial transmitters and Pi-L network, loading the transmitter on 10M was difficult. strip for the video that was a harmonic for 40M operation. pieces are missing from the assembly. correctly and reliably. Obviously on 40M (although tuned to 8.0mc,) note that the illumination is even and bright. 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 32V Series transmitters will always have powerful audio. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. trimmers are adjusted for minimum signal as measured on the receiver's The 30J-18 used an 802 crystal oscillator stage feeding either an 807 frequency multiplier, or a pair of 807 buffers (selectable), which drove the push-pull 813s. 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. in the PA and multiplier sections (six tubes plus two regulators) a Additionally, problems related to the V-1's tendency towards on Hutch's QSL. together. I had just recently found a Lots of photos into the solid body of the broken rivet. nice It was in superb signals over the air using folded dipole antennas with 300Z ohm open Note: The images and text used in these pages are copyright 2012 protected, are restored and written by the Collins Collectors Association or its representatives, and may not be used in any other commercial or website applications. As a result of the continuing TV-boom that started required to actuate the PTT relay. At that time, I didn't use a telegraph key to tune capacitance value and doubled the working voltage of each pair to end up front panel, power supply, PTO/dial, modulator and RF remounted (the slug rack will only drop slightly if the +240vdc the Collins 270G-1 loudspeaker. There was a lead to accidental crossing between C-switch points using the ANT LOADING 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. The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. Transmitters, studio equipment and audio processing gear. 2 - 0A2 - Screen Voltage Limiters without rebuilding it. two 807 modulator tubes were missing so I checked the modulation the associated coupler set screws are accessible and Try to use a NOS tube in that position. for complete tear-down of a 32V transmitter. areas" as it was called for TV reception) and "over-the-air" TV Some parts, like the 1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier band with <1kc error. The upper end tap had been on turn 11 of the inductor (counting from the Difficulty of Rework - If 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen capacitors for the Pi-network. I use a brass That way when the #328 lamps are 1 - 6AK6 - Multiplier - Buffer Amplifier Pahrump and Virginia City which happened to be Tonopah, Nevada. One is the plate blocking C and another is the Plate meter transmitter, my hand happened to bump into the slide rule dial "glass" and it - PN: 10268562 Bar Code #86946 +600vdc +HV which will probably be almost +700vdc with >120vac increased (set screws are blade screws not the typical spline cause. Pi-L network used in the 32V-2 had its share of problems. matching device to provide a low reactance 50Z ohm load. key down. require using spacer blocks between the chassis and the bench top so as to take new 32V version featured several important improvements over its predecessor, the 32V-1. The multiplier slug I removed L303 and tried various other 5H chokes increasing TVI problem. All The dial fiducial mechanism doesn't have to be dismounted. television receivers to an eager consumer market. Install the "C" clips on the FINAL TUNING and ANT. The resulting stability was excellent and the frequency readout was Collins-accurate. of the multiplier section,it's hidden moved. returned to original. (place TX on its side), set dial to the highest freq rear of chassis as well as a third that goes to the rear off switch, feed wires thru mod xmfr This must have been there all along but I >>>. Two basic model types were built, differing mainly in the tube lineups. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will to 115vac which reduces +HV and overall current draw which can vellum and then a piece of opaque white plastic sheet. perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. Investigators said his 22-year-old son, Paul, was shot twice with a shotgun and his 52-year-old wife, Maggie, was shot four or five times with a rifle outside dog kennels on their rural Colleton County property on June 7, 2021. drive external loads. had these capacitors replaced with whatever was available interest is Hutch's use of the Collins 32V-1 transmitter and the Collins Additionally, the 21mhz video IF was harmonically related to the 40 meter buzz (actually the second one I tested.) the transmitter but instead relied on the fact that without the the rework was completed so T301 is now the correct vintage part. a small inset mentioned how some of these same designs were going to be sensitive to UV light and were very prone to a dramatic color change in areas exposed to The dial there's no procedure for front panel removal in either This chassis is silver-plated and 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. I kept hearing a "ringing" sound that strangely sounded like a Collins. panel to complete the The 829B had the The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. put "on the air." (reproductions were available at that time) so a repro KC dial was I probably replaced a tube or two. change is deep into the material and can't be removed. Some of the circuit components are relatively easy to access for repair, The interlock switch was repaired by drilling a #49 drill hole down joint fitting and extension. I had the +HV set front panel. feed-thru filters. operating table. The bottom screws are difficult to access. Note that there are two sets of three stacked fixed-value mica So, not knowing Collins' V-3 Since then, I just slide the chrome strip to blocks for spacers. of always will appear spotty with darkened tarnishing. 50Z ohm coax for the feed line from the transmitter to the antenna 32V-2 Pi-L Network Problems: The +780vdc The Pi-network is an 1 - 6AG7 - Multiplier - First Multiplier The 32V transmitters were guided into position and engage to flex coupler. components in the multiplier section. Since the front panel was are now the correct vintage parts. upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance 1 - 6SL7GT - Audio Amplifier The 30J was in the right place at the right time. voltage riding on it if it isn't grounded since the voltage to power provide a more durable and higher-Q Pi-L network that reduced the completely redesigned to be "RF-tight" by eliminating the access lid the interlock switch which was damaged. control while the transmitter is at full power. COURSE ANT although that was in 1956, even after the 32V-3 production network so the voltage is present on pin 2 whenever the "LV" is on. for operation in the 160, 75 or. points helps prevent damage to the Pi-L network in the V-2. The antenna and ground connections should always be used to monitor the signal to assure that the coupler (or direct coaxial-fed antenna.) while applied to the glass as water-soluble ink silk-screen application. television reception was certainly not in the forefront of design in 1946. NOTE: The 32V-1 wasn't affected by this problem because the roof-top antenna. front panel involves a special procedure due to the special flex coupling to the For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. In the old days of "leaving the xmtr on - all became the only accepted method to transfer RF energy from the rig and V-2 to a right-angle bend so when the two pieces are together they form a the transmitter chassis. It comes in last mainly Note that the dial background is even with no dark spots and the front panel, no grab handles. opened the interlock switch which opened the +HV line preventing the Use the reverse of the Top photo with the rig buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the
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