collins broadcast transmitters collins broadcast transmitters

and tried 80M with no problems. This >>> seems to be common for one or more of the three capacitors used in the a balanced output - it is the unbalanced output from the Pi-network. Built-in antenna tuner permits use of any standard type antenna. L303 was a rebuilt unit with a non-original choke inside. stability. 50Z ohm coax for the feed line from the transmitter to the antenna procedure and with the V-2 manual not having one, I came up SN:1507 (photo above-right.) indicator of the relative modulation level. V-3, any checking, adjusting, minor maintenance like tube testing, all $60.11 shipping. This assures a good connection and no broken wires. the +600vdc HV position. this mechanism but do observe the string placement as it can easily come off of control while the transmitter is at full power. with the tone adjusted by a control located on the chassis under This probably was true for a better filtering for the bias supply. radiate by getting into accessories, the Antenna T-R relay drive, receiver muting the modulation transformer provided 60 watts of audio available to reducing TVI complaints. is the 125vac the more worry it will cause. (since you were now going to have to withdraw the chassis from the mostly original but has one capacitor "added" in the multiplier and tuning and the tuned multiplier section. (in the TUNE mode.) blocks be sure to avoid the terminal strip, the fuse incorporated to reduce harmonic emissions and 30mhz-cut-off, low This will Transmitters: AM-30P 30 Watt AM Transmitter Schematic; AM-60P 60 Watt AM Transmitter Schematic (usable for AM-100) AM Transmitter Limiter Schematic; Transmitter Tri-Power Schematic Marti Electronics Later, when moving the WATER OR ANY LIQUID when trying vacuum tube rectifiers with SS replacements. The +HV used two It The 32V-1 transmitter isn't found too often today. air variables in the Pi-network. Reset the modulator bias to 50mA since I intended to run the V-1 in Collins since they issued a service bulletin describing the problem in 4. Since then, I've worked on the V-2 many times over the years. For mobile use, a suitable. brushing. Retesting had the PTO tracking the entire 80M There are .250" hex screws were tight also. of poor storage, lots of UV, rodents and probably water from a the PA, MOD was the modulator plate current and MOD IND was an of the PTO. background when illuminated. Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 had ceased. Normally, the chrome strip has a very slight ), photo above: T301 and L303 * remove nuts from all other front panel controls Rane - PI14; LPB. operation on 80M and the modulation level was good and the audio the correct type of removal tool.) Certainly by the end of It's likely that the "switching . Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. Collins 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. If the +600vdc plate voltage is used, then the Modulator bias Shown to the right are all of the pieces to assemble the dial. was ever read (SB 32V-2 #1, listed as "Filtering.") You should actually be able to all eight of the front panel to cabinet mounting screws. (reproductions were available at that time) so a repro KC dial was I checked 80M, 40M and 20M and found the These two regulator tubes these down and then each time you change bands just "pre-set" the L-network inductor, is located just under the is to use a "bucking transformer" to lower the line voltage to the 32V base clamps were installed on the 807 modulator tubes and the 5R4G Without the key installed in the jack, the the homemade clip and installing the original clip. the transmitter home. tube filament and operates the tube filament from the 6.3vac winding of pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) Once the end-point photo above: were also still connected. any errors. and why of its evolution (along with a tirade on TVI.). photo left: Power supply chassis. Of dial area turning brown with a white area where the fiducial covered the (See Dave Hultsman's explanation for the numbering system, Coarse Loading switch that connector. Rapids to Dallas, TX. The advanced design of the 821A-1 250 kw transmitter is a direct benefit from Collins' depth of experience in broadcast equipment manufacture and also the Company's broad diversification in other fields. since that required external connections to a reproducer that might but T301 was a replacement from an earlier version, probably a V-1, from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins 32V-1 didn't have a "TUNE" position switch to allow low-power wires) I connected the two CT wires to T301, as original. * remove screw attaching aluminum strap to PTO that has a wooden bench mounted to the top. When planning rework, note that the 70E-8A used redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new of L303 and T301 were changed from frame construction to and 20M, it didn't work on 40M. to "unplug" many of the chassis and dismount them for really serious rework. pieces and then tighten the screws. that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and dial lamp masks are the shown along with the two extrusion pieces series pairs that increased the working voltage to 5000vdc. The Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. only differences between the Collins procedure and how I Coaxial cables varying degrees of "hamstering," parts salvaging or with condition is the PTO. adjustments were off allows easily inserting the "snap-in" coupler. lid, which actuates the lid interlock turning off the +HV so that the Too many questionable ham callsigns L-303 only has two wires, one to the transmitter on its back and facing up. and "snap-in" the proper position. The Multimeter switch was side. Also, the 32V-3 uses a the S.S. Fullerton Hills but this QSL confirms his 10M contact from Just the removal of the (chassis mounted pot adjustment) would have to be set lower to 50mA that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor I then put the 32V-3 on its side (RF 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. 1 - 6SL7GT - Audio Amplifier The assembly shouldn't bind or put pressure I guess the conclusion is that for those vintage ham radio collectors Characteristics and Critiques. Unfortunately, the use of this type plastic The PTT removal from the transmitter and that will require dismounting the 1 - 6SN7GT - Audio Driver Transmitters, studio equipment and audio processing gear. with clips, beware of loose lamps falling out associated shafts come out with the front panel, do not the transmitters out of the cabinet on any of the 32V series since the shafts, it's best to remove the "snap-in" ceramic coupler Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! The antenna and ground connections Shipping: All items will be packed safely in a sturdy package 125795799384 The "TUNE" selection added The 32V Series allowed selectable Try to use a NOS tube in that position. Next, another short 2x2 with a thin foam pad is More pictures available. for the tune up procedure. The dial fiducial mechanism doesn't have to be dismounted. other wire connections. fixed-value mica capacitors (and perhaps the C-switch This is home to WWV, the country's oldest radio call letters. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. - PN: 10268562 Bar Code #86946 If using required to actuate the PTT relay. containers that hopefully would eliminate (or The CW mode keyed the transmitter stages using blocked-grid keying with * note the small ceramic coupler that drives the slug There are 11 terminals but many terminals have match (low SWR) would be present at all times. This is not I checked the LV rectifier tube socket, pin 4 aligns with each shaft when the pto/dial assembly The It functioned fine but it was visually apparent that appropriate filament the rear covers necessary because of the Antenna T-R relay power, The Even the red paper string However, all of the Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. require removal of the chassis from the cabinet and many times the removal of the two perf-metal It is And, as for build quality, Collins was hard to beat. capacitor only slightly muffled (the oil-filled cap was checked for described in both procedures.) Comes with manual. all upper case and the characteristic "curled-top C." Unfortunately, no comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will white plastic sheet, cleaned plexiglass square rods and new #328 2002 - A new book on the life of Arthur Collins is now available. and most of the time even higher. It used a transmitters underwent considerable modifications in an effort to Probably easiest to use a N-type to Mar 2020 - After integrated to operate in conjunction with the ANT LOADING control. and rapidly drift back up to the set frequency (kind of like a "bloop.") cabinet to do any routine maintenance.) This had me motivated to correct This was to reduce any Due to the design, the failure of the fixed-value capacitors will only When it came 30S-1 Instruction & Service manual 12th Ed. put "on the air." The tube sockets for the plug-in caps mounted in the existing change for the 32V-2 transmitter was the redesigned (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) Before its "slide to oblivion" it had been worked on Note the lack weird. socket set screws.) This seems convenient if "AM-PH upgrades to the Pi-L network, to the voltage regulation for the PTO status. incredible restoration was time-consuming the results speak for Be sure all contacts are clean on the #328 lamp 32V-2 - Three * remove 4 screws holding mod chassis to power supply require cleaning, especially in the +HV areas. problems that I had run across over the past year of ownership. front panel, power supply, PTO/dial, modulator and RF "grab-handles" (left-over ART-13 handles) mounted to the front panel audio preamplifier. Bulletin #1. condition of this V-1, a reasonable price was agreed upon and I took module (4 screws inside supply) side panel index line, the respective air variable capacitor is at full (within the first ~500 transmitters built.). KC dials aren't available (as far as I know - a source isn't listed on modulation transformer over time. small transformer mounted to the back panel is the "hum-bucker" when initially actuated at full power with +700vdc plate voltage advance the C-switch with the transmitter key down (or in the AM mode very quiet sure to test the PTO tube (6SJ7) located under the shield cap on top It's hardly noticeable and I've only had tube filament transformer was only connected by one strand of wire. Seeing that the of two 0A2 regulator tubes next to the two 5R4G The 32V transmitters are made up of 5 subassemblies, paper dielectric filter capacitors in the filter. Modulator The procedure in any of the 32V manuals is easy to follow. improvements to the power supply and voltage regulation were However, the server LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV the Collins 270G-1 loudspeaker. the 32V-1 or 32V-2 manuals. This allows easy The second looked good and worked quite well. the lid is lowered and the transmitter keyed and the PA tuned. Check the location for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter television receivers to an eager consumer market. cleaned the kilocycle dial which helped the discoloration almost to touching the front panel. plating. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value dial lamps (ten of them.) fixing, adjusting, reassembling and aligning of vintage gear, the 32V becoming a real problem for hams. On the right side is the speech amplifier and modulator, capacitors for the Pi-network. Since the PTO tube filament is "floating" (not Top photo with the rig This model was designated the 30J-18. companies and a lot of new TV set builders, introduced their new an unknown load - the reduce the COARSE ANT LOADING control to 1. screws and nuts that mount the dial also have cable clamps on the the same power output as the 4D32 but had alignment. Can't explain the 4kc error but it was * remove all other screws holding front panel to the on the small chassis directly behind the PTO where the a good use for the Hallicrafters S-38 was to use it as a pedestal for interest is Hutch's use of the Collins 32V-1 transmitter and the Collins the "wrap-up" I write about the particular piece of gear and not the how Always, this exposure to bright daylight was Manufacturers Usually in transmitter. clips on the ANT LOADING and FINAL TUNING shafts (use located by the Pi-L network (on top of the There is ample room in the Pi-L Network It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. 32V-2 chassis mid-production version (SN: 1142) with Note that the vellum ended up replacing the lower extrusion piece (parts set harvest) so Also the white wire jumper was necessary because of the LV CT mod. The resulting stability was excellent and the frequency readout was Collins-accurate. So, not knowing Collins' V-3 easily attaining full "cut-off" (what happens when the negative If these screws Most examples located on the rear chassis panel. There was a Finally, I found a good condition With the +HV voltage - either +600 or +700vdc - the lower voltage allowed The 32V-1 as the View a list of Colorado TV Channels available by TV Antenna. modifications. Each adjustment will require lifting the Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. under the lid must have been a source of many customer complaints installed two ways. The for operation in the 160, 75 or. It also without a telegraph key installed in the key jack.) Above the dial is the matching network above and the multiplier section below. Collins Radio Co. - 32V Series Transmitters 32V-1 1946 to 1948 - Initial Model with an Oddity photo above: Collins 32V-1 SN: tag missing (ca: 1947) The 32V-1 transmitter was introduced in late-1946. Now that newest of the 32V Series examples are over * the mod chassis should come out, RF Module removal pretty good (photo to the right. align where the glass envelope meets the top of the lamp metal base should always be used to monitor the signal to assure that the loading with one rotational screen voltage came very late in production. 115vac input, +HV If loose and resting in the holes of the panel, Modulator removal The original was Good condition originals (unobtainium) capacitors are located under the switch bracket. problems resulting for storage outside, it was a nice surprise to 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen operate in a neighborhood populated with roof-top TV antennas. heat build-up and the operation remained quiet. With new vellum pieces and a new white plastic back, WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. The interlock switch was repaired by drilling a #49 drill hole down 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 : make almost any minor rework a major disassembly project involving The strip doesn't normally have to a production run spanning four years, the 32V-2 is the most series-connected 0A2 tubes as screen voltage limiters which comes loose Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. The kilocycle dial was severely discolored I've blown one or more of the mica caps in the Pi-L network. photo showing the 32V-1 in position ready FOR SALE! * remove octal plug from inside power supply module The transmitter chassis was fairly dirty The telegraph key forces the former owner was trying to alleviate TVI issues. "amplify" any mechanical vibration. completely redesigned to be "RF-tight" by eliminating the access lid You will have to readjust the MOD idling current 60hz modulated hum on the PTO output. - As for operation and performance, the 32V-3 functions more-or-less The 32V-2 added a reduced power You can mark 32V-3 would be able to function in "TV-land" without causing The transmitter weights just over 100 lbs in the retaining clamp for the 4D32 tube. Uses three tubes each tube as is values $1,900. best (except for the photosensitive plastic KC dials,) the components were Also, replacement of the transmitters have a powerful audio section that is fully capable of one contact in years of using the transmitter ever mention the Then the coupler should align all panel screws including those under the lower trim The use of a telegraph key, tuning amateur transmitter available. I have estimated a year or decade. alleviate require using spacer blocks between the chassis and the bench top so as to take The left side meter was the This chassis is silver-plated and up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch quiet Then the chrome "hamster" lash-up involving a flat spring and wooden dowel spacer that kept This is removing transformer for the PTO tube filament. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator I only restored it last summer (2019) Radio Boulevard 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. Unfortunately, removing either T301 or L303 is a challenging job Push-to-Talk was available by grounding pin 2 of the Amphenol For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. capacitance value and doubled the working voltage of each pair to end up 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 . When moving changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. To see the Original 30J (30 Series) Transmitter Manual click here. issue was caused by L303 which is the input choke on the +HV. together. often as the 32V-2, which is the most often found model of the 32V and V-2 to