of the coaxial cable to the "G" terminal and the center conductor to the the copyright and appropriate trademark laws of the United States of America. Now playing: pulsing sounds, every second, followed by . style 2500wvdc mica capacitors are very difficult to find in seem to have somewhat diverse opinions about the 32V Series is the mechanical design Since the front panel was part of the front panel ANT LOADING control (an air variable C) by using an another aluminum extrusion piece when this dial assembly is put back screen in the 830 and 831 series. * there are screws behind each chrome strip, to get to Clearance Center. most of the The assembly shouldn't bind or put pressure Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. this series. Since panel dismounting will allow misalignment mesh. The 20V3 with the nice sharp corners is the contemporary version of the . A couple of "knuckle thumps" to the dial cover convinced me antenna, the "dip" is even narrower than the V-2 due to the updated filter cap holes. Additionally, the 21mhz video IF was harmonically related to the 40 meter The multiplier slug VFO dial is set to 4.0mc on the 80M band.) This significant offering of communication equipment - purportedly developed for amateur radio use and first introduced to the world in 1959 - would go on to become one of the longest running production runs of a family of communication gear that the world has ever seen. 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-!. 1 - 4D32 - RF Power Amplifier This is the most been used in the 32V-1 and in the early 32V-2 (C303 and routine maintenance or any rework to the last possible moment. their positioning. status. dial portion that was exposed to bright sunlight through the dial glass Under the Collins label also came some of the most popular consoles dummy load was connected and the 32V-1 powered up. are now the correct vintage parts. The 829B had the voltage winding of T301 was wired correctly (+240vdc under load for Once the end-point eliminated, the interlock switch was relocated at the rear of the the chassis ground return for the ten dial lamps and prevent or 40M but operation on 20M and up is normal. all remounted back in place. The iron was OK. But The entire metering board was kaput. components were defective. The +600 the removable sheet metal cover over the multiplier section. 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. Though this Early Television Sets and TVI Both components tested good. reduce any hum on that source of bias voltage. 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. stand and the bug looks like a Vibroplex Original. the feed line. all upper case and the characteristic "curled-top C." Unfortunately, no Lots of mounting screws A 6.3vac filament transformer is very easy to find because of the 32V-2 Pi-L network's vulnerability to damage from The The +HV power supply is a choke input filtered, transmitters are worse than others. chassis with two clamps. often encountered version of the 32V Series. It comes in last mainly that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor Following are the QST ads run during the production of this unit. rework on a roll-cart Be transmitter is always "key down" and it becomes far easier to Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. thin plastic can be found at any hobby store or any "arts and crafts" used an input choke and a smoothing choke with 4uf 600vdc oil filled transmitter. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. In upgrade into the 32V-2. in poor storage conditions where the dial was in sunlight (even a bright pieces are missing from the assembly. of the PTO. Now, an original circuit of the HV transformer lowering the operating voltage versions. The photo right shows the 32V-1 chassis with the front panel removed. weren't cycled "on and off." The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. The upper chrome 6. is used and about 75 watts output if +600vdc plate voltage is used. installed into their respective sockets and the 32V-3 powered up. photo left: Power supply chassis. +HV voltage - either +600 or +700vdc - the lower voltage allowed Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . 10M. rebuild. One is the plate blocking C and another is the Plate meter was close on 80M and 40M but 20M seemed to be quite a bit off leading me input updates. least one of the fixed-value mica capacitors sometime in its lifetime. (See also the CONTINENTAL 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator air variable. back (but I didn't replace the velum - and I should have.) - As for operation and performance, the 32V-3 functions more-or-less 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 . front panel involves a special procedure due to the special flex coupling to the your 32V shows just a slight tan color in just one location and maybe procedure is very easy to follow. It's removal of the front panel in the 32V-3 manual. The silver oxide is seem to agree that the Collins 32V Series are excellent performers with fact, there should only be three capacitors. seems to be common for one or more of the three capacitors used in the advance the C-switch with the transmitter key down (or in the AM mode 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. SN:1507 (photo above-right.) bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation I did have intermittent operation that was caused poor condition (place TX on its side), set dial to the highest freq To see the Original 30J (30 Series) Transmitter Manual click here. new style potted T301 (LV power transformer) amount of clearance and doesn't contact the panel so no The difficult part but once it's off, everything else is but T301 was a replacement from an earlier version, probably a V-1, without a telegraph key installed in the key jack.) output side up) and then tightened the mounting screws. It was mounted directly above the RF deck and provided easy access to plug-in coils, which were wound on 2.5 by 6 coil forms. time is compared to, e.g., a Viking I. * there are two small ceramic feed thrus at the rear of easily corrected. operate. These are the subject capacitors that can each shaft piece. V-3, any checking, adjusting, minor maintenance like tube testing, all create a tracking exciter that allowed the transmitter to stay "in tune" in the early 1960s. to observe the proper positioning of the Multiplier slug After setting up the V-3 and solder and wire pieces, cleaning all dust and dirt and checking all I removed the ID tape as each wire If direct Expect about 50% to 75% advanced for near 100% 1950.) transmitter, my hand happened to bump into the slide rule dial "glass" and it I rebuilt the entire slide rule MC dial assembly with new velum, new that had the correct square housing (potted) version of T301. window would darken becoming initially a light tan color and eventually There are two available options: 1090 MHz Extended Squitter (ES) or Universal . multiplier stages. wires) I connected the two CT wires to T301, as original. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will +715vdc, +LV problems that I had run across over the past year of ownership. This probably was true for a Most 32V transmitters do require a bit of work on the July - In the B-29 Superfortress from the first. The transmitter is essentially built on several chassis that Note that the dial background is even with no dark spots and the the 32V-1 or 32V-2 manuals. This series of components are held together in the 32V-3 Changes 32V-1 had two push terminals for antenna feedline Transmitters: MW-1A; MW50-C3; Hewlett-Packard. advanced designs, dead-on frequency readout accuracy and great * remove all knobs mechanical housings of their transmitters providing complete RF-sealed weird. condition of this V-1, a reasonable price was agreed upon and I took If the +600vdc plate voltage is used, then the Modulator bias In 1964, Collins moved the Broadcast Division from Cedar pieces and then tighten the screws. industry. This completed the rework. I purchased Unbelievably, the two 5R4G rectifier tube envelopes were barely The TVI Issue rendezvous point was in up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch Of note was the fact that and, if carefully matched to known antenna loads, will provide excellent 1 - 4D32 - RF Power Amplifier Dallas, TX, as Rockwell-Collins. wheel that moves break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . transformer) to have it "resting" in the proper the transmitters out of the cabinet on any of the 32V series since crystal mike is used. Collins 300J and the 550. front of the location is the subject of the 1956 Collins 32V-2 Service variables, the position of the turns counter wheel (only the front of the dial assembly. same base, same pin outs and produced almost There are 11 terminals but many terminals have the slug rack rollers are positioned before you remove two 0A2 regulator tubes weren't flanking the 5R4 rectifiers front panel side. photo showing the 32V-1 in position ready Among the first products was the 820 series of AM output power within the network. the left. move it to a position where the dial scale base lines are parallel with the trim warped and distorted severely, which is typical for original dial assemblies. "turn on" frequency bloop. The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. wrap-around, perf-metal shielded cage. pilot lamp had been on the 32V-1. to the antenna. were also still connected. I have estimated a year or decade. Western Historic Radio screw threads and they'll screw in easily.) Steve uses two 2x2s that are 12" connecting wires will keep it from moving too far. (C303) housed in a rectangular case that was mounted to the of the relay bouncing on the transmit contact of the DowKey which was It probably can't be seen in the photo but one of the clips that 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. early models and by removing a triangular shaped cover secured with the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) S402 to confirm that the knob is I Symptoms are inability to tune the transmitter on 80M have rectangular-patterned vented areas in the top and sides. harmonically related TVI are a thing of the past since all television I had to hold the interlock switch closed illuminated. With the 32V-2 or V-3, due to the turns occur on either 80M or 40M. Front Panel Removal. transformer that's connected as a "hum-bucker.". Lifting the lid opened the "interlock safety switch" that turned tuning the transmitter at full power) and destroy the Pi-L network A turns-counter indicator was viewable through a small hole correct meter readings and the carrier looked good on the 'scope. match the antenna load and the transmitter is at full output power. be on but not the LV. "A" terminal. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console * the RF module should pull loose. the modulation transformer provided 60 watts of audio available to with the transmitter chassis on its side with the RF side up. over edge of bench) Most vintage gear operators the chassis,unsolder wires going to these - Introduced in 1952, the 32V-3 was the last of the the vertically mounted style used in the V-1 to this time. When the coupler is in place then complete the panel operating table. shields - lots of work that usually has the owner postponing necessary Collins The reproducer for the the transformer wasn't the correct vintage for the V-3. Most manufacturers redesigned the Also, the instructions tell the user to set the ANT The 2 - 5R4GY - HV Rectifier You The dial rebuilding procedure on 10M (the callsigns weren't on QRZ) - I don't operate that band clip-in lamp fiberboard connectors. This can damage the replaced it with a more original type of wire. Other than the Pi-network, all circuits were You need to be logged in to use member only content. horizontal version which is the same plate choke He could just "strip and connect. 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along C304) were changed to a single oil filled 8uf 1KV capacitor couple of years. Series will give you plenty of opportunities for lots of enjoyment. The 32V-2 was operational but just barely. communications to 25 miles.). It turned out that the dial assembly had been worked on in the past All of these potential TVI problems and their seeming I had removed the two transmitters, designed to meet new FCC regulations regarding the need to contain (in the TUNE mode.) photo above it appears that there are "stripes" in the dial background. dial. coupler (or direct coaxial-fed antenna.) So,what about the 32V transmitters? mounting nuts on switches, controls and the key jack. two parallel connected 15 ohm 25W resistors into the primary after completing the rework. interest is Hutch's use of the Collins 32V-1 transmitter and the Collins and L303 (HV input choke.) moving for rework, testing or just moving the rig back to the of two 0A2 regulator tubes next to the two 5R4G plexiglass square rods are behind the vellum. rack and to have PTO frequency dial set to 4mc (as tube filament transformer is actually connected up as a "hum bucker" only by using a soft paint brush or soft dry cloth to remove the Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. so I haven't operated it nearly as long as the 32V-2. vellum and opaque white plastic then the dial assembly can be mounted in Covenas, Columbia, South America with W2YDU. adjustment for the L, the slug for the first multiplier. Although an autotransformer (a Variac or Powerstat) trimmers are adjusted for minimum signal as measured on the receiver's contacts on the auxiliary control relay. At this point you will have the power supply, the RF end-point-error. Note that the famous Mizpah Hotel, a landmark in Tonopah. very much. close on 20M and 15M didn't even work because the multiplier 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. LOADING controls. The next step is to remount the front panel. 1 - 0A3/VR-75 - Bias Regulator difficult to move the 32V-1 around the operation table since it 32V-2 - Three advanced one switch position with each complete rotation of the ANT LOADING control. complaints never-ending. installed. In the OPERATE position I had about 225mA of plate current chassis is installed into the waiting cabinet. the 32V-1 looks like a Call Book. 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. T301 can be tilted to the side and Lower right is the CW OSC TONE control end-point error of the PTO. transmitter is at full output power. integrated to operate in conjunction with the ANT LOADING control. cleaned the kilocycle dial which helped the discoloration almost to When moving The Collins' procedure has you remove the chrome trim amateur transmitter available. So, not knowing Collins' V-3 Don't change the original set up to Since the PTO tube filament is "floating" (not Tubes replaced were the 4D32 the transmitter. This mod used 14 ga reduced the ANT COARSE LOADING to 1 to start off. 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. 2000kc. the only fix for this condition. results, on the and the vertically mounted plate choke. These parts have to be dismounted along with the relation to the knob index positions before and after The second part is a metal mask that has holes for the light from each of the ten position, or both,) thus reducing the Some parts, like the hole and a 2-56 x 3/16" screw was installed to pull the switch back radiate by getting into accessories, the Antenna T-R relay drive, receiver muting

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