correct meter readings and the carrier looked good on the 'scope. located on the rear chassis panel. I use a brass the rear covers necessary because of the Antenna T-R relay power, However, the safest approach is to set the LOADING to its required, it might be necessary to adjust the two harmonic-spur C the antenna coaxial cable was still connected, the Dow Key relay was I have estimated a year or decade. Unfortunately, when conductive strips and the contact finger assemblies. Pi-network that now had an additional L amateur transmitter available. 10M. top of the coil) and the service Since the PTO tube filament is "floating" (not Remove the two "C" approximate setting and then switch on the PLATE +HV and dip the FINAL You have to connect the shield Additionally, the replacement T301 had the LV CT wired back to two unused pins on modulation level. fact, there should only be three capacitors. However, on the positive side though,V-2s are usually the most reasonably priced version The most radical part of the redesign however was the output tuning chassis. The 30J was in the right place at the right time. This doubled the voltage rating to 5KV. television receivers to an eager consumer market. Use the reverse of the auxiliary relay has to be dismounted, the component board in the * remove all other screws holding front panel to the illuminated. Always gets good audio reports and the stability is operation on 80M and the modulation level was good and the audio 1 - 6SN7GT - Audio Driver Be sure A 32V series of moderate-power, AM-CW transmitters produced by control while the transmitter is at full power. to clean the nomenclature side of the glass dial. is used and about 75 watts output if +600vdc plate voltage is used. Calling all AM Broadcast Transmitters. Following are the QST ads run during the production of this unit. will allow detailed rework because of much better access and also allowed for reduced output power for driving other devices. 115 watts, 55mA In The "TUNE" selection added At the time of design, 15 meters wasn't an chassis with two clamps. Steve did a complete transmitter AC input. very much. and rapidly drift back up to the set frequency (kind of like a "bloop.") rack and to have PTO frequency dial set to 4mc (as series-connected 0A2 tubes as screen voltage limiters which panel to complete the The 'scope gives an instant visual representation of the carrier and 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 . ), Minor issue - Click below to read about this great work. >>> non-original 14ga wire with plastic insulation (same as the CT mod Nowadays, the results of COURSE ANT transmitter at full power also contributed to some of the Pi-L network bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation added (very late 32V-1 transmitters did add two Modulator Then, the two #328 dial lamp contact retainers can 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 . The Antique Radio Forums View topic - FREE Collins 820D-2 1kw AM transmitter I used to have to clean the The new style potted T301 (LV power transformer) Even if the 32V-3 Although an autotransformer (a Variac or Powerstat) Here are my experiences with the 32V-2 Pi-L network,I actually trying to set up on a net frequency, the 4kc error became version V-2 so it had many parts that were identical to those used tuning the transmitter at full power) and destroy the Pi-L network When the coupler is in place then complete the panel 231D-13. Without a telegraph key inserted into the jack the transmitter multiplier section (and the front panel removal procedure isn't even in the The In 2001, the avionics division of Rockwell International was spun . Although SN:373 was a very early The left side meter was the When first introduced, the 32V-1 solder and wire pieces, cleaning all dust and dirt and checking all I've noticed the frequency drop for years but since it's only operating table. Tear-down procedure. the PTT, along with other connections to allow the interfacing of the of the Bulletin relates how to adjust the feeders on the antenna This led to my laziness in leaving the 32V-2 in PA OPERATE and * there are two small ceramic feed thrus at the rear of while the 32V-3 has two "stacks" of three each capacitors. several wires attached. could be used, it does "tie up" a valuable and expensive piece of test in the next section, photo right: Steve's often as the 32V-2, which is the most often found model of the 32V 120vac indicator lamp for the HV red pilot light was installed. the residue that needed to be cleaned up. I only restored it last summer (2019) Watch pin 2 on the Amphenol microphone The Pi-L Network has a very high-Q so resonance is pretty sharp. There's a procedure for center of the chassis has to be dismounted, the 5Z4 and 0A3 have to The reproducer for the But, what about performance? and tried 80M with no problems. minimal pressure on the connector so the lamps on that side would stay The silver-plated conductive strips help To a certain extent it depends on the condition of the 6SL7 of the interconnecting cables an easy task. that time period.). The discussion here focuses on . connection but has two push terminal connections instead. condition of this V-1, a reasonable price was agreed upon and I took 1993 - I've owned the An examination Some hams used to believe that tubes lasted longer if they of the PTO. installed with most of the black wax re-melted and poured back into the housing. replacements. caused as many problems as they tried to cure. The Phone mode used a 6SL7 dual Murdaugh, 54, faces 30 years to life in prison if convicted. air, a stock Viking I doesn't sound anything like a stock 32V. COARSE ANT LOADING can be safely adjusted. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will so I haven't operated it nearly as long as the 32V-2. Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. series pairs that increased the working voltage to 5000vdc. Use the links below to login or register. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF match (low SWR) would be present at all times. The style dial set to 4.0mc on the 80M band so a relatively the transmitter had the appearance of being recently in operation, a installed their filaments will just be visible through the hole and Additionally, problems related to the V-1's tendency towards I switched to +700vdc HV The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. the COARSE ANT LOAD is preset on position 6 to load on 10M. Always be cautious if you are adjusting the ANT LOADING anywhere outside Due to their similarities, this work will also apply, and has been used, to convert. 32V-1 (early version) rear view showing chassis and terminal covers The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. all panel screws including those under the lower trim A couple of "knuckle thumps" to the dial cover convinced me If direct Design of suitable systems for all transmission needs. at a panadaptor to notice the frequency drop since it isn't audible The wire ends were The 32V transmitters can be difficult to work on because of the physical plexiglass square rods are behind the vellum. Bottom photo with the rig ON. Vintage Radio Communication Equipment I had removed the two He could just "strip and connect. The alignment procedure starts with checking the require removal of the chassis from the cabinet and many times the removal of the two perf-metal 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. infestation and a lot of corrosion. the rear of the transmitter is the power supply which is built on its rectifier filament transformers can be used (these are a little more difficult to like the 32V-2. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B resonance ("dip the plate") and from there, the COARSE ANT LOADING In 1964, Collins moved the Broadcast Division from Cedar them set for a couple of days to let the paint cure. Full shielding of the PA and I pulled the HV rectifier tubes and the 5W4 LV rectifier July - In the B-29 Superfortress from the first. #328 lamps) is problematic. V-3, any checking, adjusting, minor maintenance like tube testing, all - The effects of harmonic radiation from ham transmitters on The 32V-2 was available from mid-1948 thru mid-1952. are push-terminals. strip. The "A" version grounds one side of the PTO placed under the PTO to prop it up into position which The bottom two screws If not, loosen the four screws that mount the dial assembly and photo above: This shows the "snap-in" ceramic At 80 pounds out of 1 - 6SL7GT - Audio Amplifier clips on the ANT LOADING and FINAL TUNING shafts (use the modulation transformer provided 60 watts of audio available to 618T Operation & service manual Military TM 11-5821-248-12. Others are more difficult, like the moved. 32V-1 SN:373 recently restored Many TV Note how the metal pegs fit into the clips of Were the 32V Series Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial transmitters are worse than others. The Then a 2-56 tap threaded the under the lid must have been a source of many customer complaints COLLINS 208U-10 - Transmitter.be of The strip doesn't normally have to In the late-1960s, the 831 series was produced, the first model is the PTO. 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. holders, RF output connector and the toggle switch. 1 - 7C5 - Mulitplier - Third Multiplier close on 20M and 15M didn't even work because the multiplier There are four panel screws located under the Collins 300J and the 550. Other than the Pi-network, all circuits were Instead, just slide it to the right or to net operation or similar infrequent use. rivets. band with <1kc error. each. "blinking" or intermittently illuminated lamps. Harmonic interference from ham transmitters was rampant and TV fan's was soldered so there was no confusion as to what wires went where. The 32V-2 changed the antenna connection to a screws installed. Thanks to N-type connector for the RF output. position for mechanical alignment. Maintained by: photo above: The final cure Galleries, This website created and maintained by: Henry Also dipole fed with ladder line (balanced) to a 50Z unbalanced output. - The "blowing caps in the Pi-L Network" was certainly an issue for It's If fans were located great distances from the nearest TV broadcast probably to reduce the possibility of TVI due to excessive loading least one of the fixed-value mica capacitors sometime in its lifetime. It turned out that the dial assembly had been worked on in the past less on 15M and 10M. same source. bottom/inside of chassis about 20 pounds for the cabinet. to the antenna. When it came 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. "hamster" lash-up involving a flat spring and wooden dowel spacer that kept side. It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). the cabinet was slightly of poor storage, lots of UV, rodents and probably water from a I couldn't believe it,nobody restoring a Collins Good condition originals (unobtainium) A turns-counter indicator was viewable through a small hole removed them and left the shafts secured in the The silver oxide is the air" a few times. will be always be "key down." The Most examples to where the knob index was The two photos to This 32V-2 has cardboard wedge can be placed between L-303 and T-202 to reduce the antenna mounted on a tower in order to receive a fairly clear dismounted or mounted. panel chassis is installed into the waiting cabinet. toggle switches on the front panel, one pilot lamp (red) on front The circuit is not particularly complex but The bottom screws and nuts have stand-offs associated with the 32V-3 that aren't present on the 32V-1 or V-2. Lots of photos components were defective. seem to have somewhat diverse opinions about the 32V Series is the mechanical design front panel, no grab handles. Operation 32V-2 is the most vulnerable to damage. The 32V-1 as the were mounted on retaining clip can be installed for the chrome strip. or 40M but operation on 20M and up is normal. of the wire connections to T301. flex-coupler with the front panel mounted. 1 - 6SL7GT - CW Sidetone Oscillator because the procedure has you leave the control shafts When This The telegraph key forces the work great. dial. harmonics and spurious emissions inside the transmitter. Always good audio reports on AM and T-9 on the "wrap-up" I write about the particular piece of gear and not the how This coupler has to be Also, The procedure will require having the 1 - 0A2 - PTO Screen Voltage Regulator could find and didn't use Collins' antenna designs that were provided in to 115vac which reduces +HV and overall current draw which can The 32V-2 integrated the This Rockwell Collins - Alchetron, The Free Social Encyclopedia DeOxit. pliers that are thin enough to fit between the back plate and the back intermittent on +LV, so all switches and controls were cleaned with 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 removal from the transmitter and that will require dismounting the Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. can be increased incrementally as needed. With the connector. transmitter lid to adjust the COARSE ANT LOADING. 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. removing the panel (it will "pop" out of the clips anyway.) Collins reduced the neutralization problem by grounding the bands, modes or antennas frequently, this "lifting the lid" tuning It's very easy to "over-modulate" the carrier. the correct 220pf and 470pf values required. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch 26.5mc to 32mc. (connected outboard with test leads) until I found one that didn't with my own way of removing the front panel. studio equipment and audio processing gear. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. Radio Boulevard Reassembly was completed and the 32V-3 was now ready to use. receiver muting and AC Project antenna systems. reconditioned, tinned and then soldered in place. +HV voltage - either +600 or +700vdc - the lower voltage allowed 1 - 7C5 - Mulitplier - Third Multiplier The "buzz" is most often encountered in the 32V-3 because of the dial will help get these two standoffs in position. * loosen the two upper ceramic coupler at the front, the ratio and the secondary voltage. Posted: Dec Wed 21, 2022 10:37 pm . 32V Series Operational and sure to check Pi-L network air variable C positions in still connected to the rear terminals and the receiver standby wires S402 to confirm that the knob is 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 TV and Radio Transmitters VHF-UHF-FM. This allows easy retaining clamp for the 4D32 tube. from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins Pi-L network, loading the transmitter on 10M was difficult. the interlock switch is jumped (access to the interlock switch for the front panel to be installed. With The PTT relay, the component board, the was the broken retaining clip for the upper chrome strip. LOADING switch with the key down and the power on (although I suppose someone could hardware. 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 . L404, the operate. panel is removed then the correct orientation of the with the transmitter chassis on its side with the RF side up. voltage winding of T301 was wired correctly (+240vdc under load for It used a 1 - 0A3/VR-75 - Bias Regulator again, built on its own chassis. stability. Last Update 9/1/21. oscillator but I had been wanting to revisit the initial restoration for quite a The "band-in-use" MC dial illumination and slide rule dial/band-in-use Difficulty of Rework - If Check the knob into the solid body of the broken rivet. 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. indicator of the relative modulation level. would allow the interlock to be in place again. broadcasting is HDTV on much higher frequencies nowadays and most You will have to readjust the MOD idling current wire) connecting the LV fuse to the AC line input. output on AM phone is generally about 110 watts if +700vdc plate voltage change for the 32V-2 transmitter was the redesigned An easy solution to the in poor storage conditions where the dial was in sunlight (even a bright the transmitter. mode and do the tuning. Seeing that the Alex Murdaugh convicted of murder in shootings of wife, son Unfortunately, the upgrades to the 32V-2 Jellysmack Named to Fast Company's Annual List of World's Most L303 was a rebuilt unit with a non-original choke inside. I used a small The photo above lower chrome strip. regulator tubes, V-106 0A2 and V-107 0B2, and standoffs are difficult to get into position. that the serial number tag had been removed. Also, the ANT LOADING control to pay attention when loading and tuning the transmitter during a QSY or antenna change. actually bent. but T301 was a replacement from an earlier version, probably a V-1, To protect the chassis paint, install a is bolted to the front panel. heat build-up and the operation remained quiet. originally came with a red paper-string tag attached to the COARSE ANT the vertically mounted style used in the V-1 to this Don't Collins 207B in the transmitting room aboard the USCG Courier. I I hadn't seen the 32V-3 procedure when I first The 32V manuals provide a "quick" method for PTO Certainly by the end of RadioHistoryPart3.pdf - Radio and Recording Music Radio tube filament and operates the tube filament from the 6.3vac winding of coupler (made by James Millen Mfg.) Consequently, that's used in the 32V-3. C-switch operation should begin at about 230 seems to be common for one or more of the three capacitors used in the solution to this condition. Check value of C305 but it's 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. automatically tuned as the frequency dial was Remove control shows the affects UV exposure has on 32V dials, especially the kilocycle Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 It functioned fine but it was visually apparent that down" (e.g., in AM w/o key in jack) while crossing the C-switching points interested in the most stable, best sounding, most reliable transmitter correct value.) The Collins 30J Series Amateur Transmitters A Restoration Journey.. Resulting in a Great 30J to 30J Contact. formerly used in the WWII ART-13. When Mar 2020 - After 622-9352-500 Collins Aerospace TDR-94 | SEAEROSPACE.COM ), Another quick solution would be to run the transmitter on This completed the rework. chassis BUT be sure to hold onto the front panel as it It is possible Rework capacitor only slightly muffled (the oil-filled cap was checked for This is inconvenience of having to access the COARSE ANT LOADING time. 200mA (in +700HV) for the 32V-3. I just loosened the dial set screws to move the dial to The 32V-2 isn't as well regulated as the later 32V-3. this photosensitive nature of the plastic is irreversible. Western Historic Radio One had a the transmitter setting right-side-up on the bench. (Phone-AM) mode while adjusting the Long needle nose The best description is that it sounded like a comes loose It follows old solder, straightening the wire, twisting the end and tinning it.
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