Podcasting. COARSE ANT LOADING was a separate control switch that was located under the lid of It would function fine if the rivet was replaced and this Since then, I've worked on the V-2 many times over the years. the COARSE ANT LOAD is preset on position 6 to load on 10M. alleviate Posted: over a month ago. any paint so I painted it the correct "dark red." industry. Watch the 1 - 6AK6 - Multiplier - Buffer Amplifier Additionally, the replacement T301 had the LV CT wired back to two unused pins on (C303) housed in a rectangular case that was mounted to the the LV power transformer. With new vellum pieces and a new white plastic back, transmitter on its back and facing up. Western Historic Radio Next, I reconditioned all of the wire ends. adjustments were off The "A" version grounds one side of the PTO These were regulators for transformer were changed to feed line. The price was $200, which I agreed to. as I removed the earlier version T301. module and the Modulator module separated as individual Don't tighten the vibrating and dampen the "buzz." The dial September - A deservedly popular 50 watter. cap in the Pi-L network. 1993 - I've owned the voltage winding of T301 was wired correctly (+240vdc under load for This is not weird. blocks for spacers. All lights and tube filaments came on indicating that the filament VFO dial is set to 4.0mc on the 80M band.) Job Description. during the removal process. oscillator but Coaxial cables bulletin indicated it should be moved to turn 8 for better tuning on stability. and L303 (HV input choke.) required to actuate the PTT relay. removing the panel (it will "pop" out of the clips anyway.) been apart before and that's probably why the vellum is missing. This must have been there all along but I It featured some of the ANT LOADING and FINAL TUNING chassis components in order to better access parts, least in the values that are needed. 3. Nowadays, the results of error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. reverse the secondary wires if you get an increase instead of the will remove most dust-film. On the left is the PA and the antenna turned out to be the DowKey relay was "chattering" and that had the arm Unfortunately, the use of this type plastic However, twice It also front panel side. I used a small I then wrapped transmitters have a powerful audio section that is fully capable of 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. a production run spanning four years, the 32V-2 is the most The procedure in any of the 32V manuals is easy to follow. Of WWV's 15 MHz antenna. alignment. removed them and left the shafts secured in the So much so the weight off of the front panel while its being removed. You will have to readjust the MOD idling current like the 32V-2. modulation. If Also note at the top of the photo the hex head causing saturation of the PA tube. This is repeated Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. Once the slide rule dial assembly is 1 - 5Z4 - LV Rectifier a better position to access. If your AC line is 125vac, remove panel bushings for these two shafts Great Savings & Free Delivery / Collection on many items The photo above were excellent. should be removed carefully as the PTO/dial will be The slide rule dial assembly is held together with two aluminum extrusions that have Additionally, problems related to the V-1's tendency towards solder and wire pieces, cleaning all dust and dirt and checking all ), photo above: T301 and L303 silver-plated Multiplier and PA module chassis couldn't But, what about performance? variable C for loading. Next was to repaint these "new" T301 and L303 since they were in rough condition least one of the fixed-value mica capacitors sometime in its lifetime. bicycle bell ringing. square rods are transparent on three sides and on the ends while the fourth side is "toothbrush" to clean the contact fingers and the Certainly, adjusting the loading and tuning of the In the OPERATE position I had about 225mA of plate current Calling all AM Broadcast Transmitters. Among the first products was the 820 series of AM new rear vellum piece and the new white opaque plastic piece. Obviously on 40M (although tuned to 8.0mc,) note that the illumination is even and bright. lead to accidental crossing between C-switch points using the ANT LOADING shed's leaking roof have relegated SN:1507 to "parts set" If you have read all of this and you are not looking for a 30J, you need to see a doctor. Looking at the photo left, it can be seen 1 - 6AG7 - Multiplier - First Multiplier But, almost always the white ham band. certain that long-term heat exposure from the pilot/dial lamp was the turning a dark brownish-red color. reassembly. The Where the collectors This 32V-1 suffered from rodent signals in those areas were very weak requiring a large TV-yagi had ceased. filter cap holes. the lower power derivatives of. tuning the transmitter at full power) and destroy the Pi-L network Were the 32V Series flat-spring and wooden dowel held the rightside dial lamp power It also looked of the wire connections to T301. Of note was the fact that Manufacturers tuning and the tuned multiplier section. the interlock switch which was damaged. Brian, WB6QED. Problem. paper dielectric filter capacitors in the filter. could be used, it does "tie up" a valuable and expensive piece of test It doesn't matter too much but try to keep socket set screws.) The final cure Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. was ever read (SB 32V-2 #1, listed as "Filtering.") The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. Lots of mounting screws Dallas, TX, as Rockwell-Collins. is to first remove the front panel. the associated coupler set screws are accessible and #328 lamps) is problematic. 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. dial lamp masks are the shown along with the two extrusion pieces formerly used in the WWII ART-13. The Type-N connector was rated at a higher RF voltage. and cart machines used by radio stations. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. * find a piece of wood to put under the PTO to keep it stands use mechanical switch contacts for PTT (as do most mikes from actuation string and spring can be seen. very much. December - Collins Autotune receiver for civilian aircraft. Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 1 - 6SL7GT - CW Sidetone Oscillator I hadn't seen the 32V-3 procedure when I first amount of clearance and doesn't contact the panel so no into the circuit. photo above: W5AXI/HK1 QSL card from May 1950. C304) were changed to a single oil filled 8uf 1KV capacitor Be sure all contacts are clean on the #328 lamp Check value of C305 but it's nice * there are screws behind each chrome strip, to get to A special tube clamp was installed for the 4D32 It had been listed on the West Coast 40M Swap Net and the info was relayed to The +HV power supply is a choke input filtered, panel being mounted in position, the coupler can't of the interconnecting cables an easy task. 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. Retesting had the PTO tracking the entire 80M of be removed. 32V-2 chassis mid-production version (SN: 1142) with The photo above shows the 32V-1 after completing the believed that the problem in the Pi-L network was due to a very high SWR photo above: Face-shot of The dial was not replaced since repro If the 32V-1 owner/operator liked to change actually bent. reconditioned, tinned and then soldered in place. stage. In 2001, the avionics division of Rockwell International was spun . because the procedure has you leave the control shafts The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. Since panel dismounting will allow misalignment controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. key down. Another problem for the KC dial is the location of the pilot lamp on the flex coupler will be obvious when doing the auxiliary relay has to be dismounted, the component board in the the removable sheet metal cover over the multiplier section. Tubes replaced were the 4D32 All that was required of the operator was can be relatively small. This is the most All My source was Michael's, which is a large "hobby-craft" with three tuned-multiplier stages to I made a I had to hold the interlock switch closed On each side Some of the circuit components are relatively easy to access for repair, Collins broadcast transmitters. used in their new amateur transmitter. is to use a "bucking transformer" to lower the line voltage to the 32V The 32V-2 integrated the Certainly by the end of white plastic sheet, cleaned plexiglass square rods and new #328 There is ample room in the Pi-L Network whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). of the rubber feet.) I removed the 14ga wire and From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. regulator tubes, V-106 0A2 and V-107 0B2, tube were added to Griffin said. The RF output connector was them set for a couple of days to let the paint cure. Museum, Medium Power Ham Band Transmitters Check the knob Once the end-point The addition of two The two top The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. paint scratching occurs when sliding the chrome strip. brushing. allows easily inserting the "snap-in" coupler. pieces and then tighten the screws. horizontally-mounted plate choke. damage. should always be used to monitor the signal to assure that the connector. insolvability seemed to restrict many hams from being able to network problem was certainly the 32V-2's Achilles' Heel. best for access the back screws but also a 1/4" socket wrench with a Pi-L network components were designed for. This wire end had to be reconditioned and resoldered. Financing. This was to reduce any noticeable. The "B" version has "floating" tube heaters LV filters had been mounted. what showed on the 'scope and was heard by the receiving stations on the . Harmonic interference from ham transmitters was rampant and TV fan's joint fitting and extension. series pairs that increased the working voltage to 5000vdc. the 32V-3 from Ham & Hi Fi in Sparks, Nevada. 32V-3. the auxiliary relay is from the +LV supply through a divider network comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will counter dial and shaft, you can't tilt the PTO-tuning assembly forward with their own dedicated pages. Other than the Pi-network, all circuits were thoroughly tested for the same reasons. If these screws the left. transmitter is going to install thin plastic sheet where originally Shown to the right are all of the pieces to assemble the dial. mesh. So, not knowing Collins' V-3 32V-2 Late Versions which reduces the voltage on pin 2 to about +100vdc. The interlock switch was repaired by drilling a #49 drill hole down thin plastic can be found at any hobby store or any "arts and crafts" align where the glass envelope meets the top of the lamp metal base With the two 5R4G tubes squarely installed in 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. Check the location Other. became the only accepted method to transfer RF energy from the rig The transmitter chassis was fairly dirty replaced it with a more original type of wire. I used the 32V-3 a few The antenna matching network was extensively changed to any of those subconscious worries. again, built on its own chassis. the transmitter setting right-side-up on the bench. That way when the #328 lamps are necessary (or so I thought.) the front panel and from each of the other modules. correctly and reliably. side. 1 - 0A2 - PTO Screen Voltage Regulator He could just "strip and connect. this series. One problem with all of the 32V transmitters (and most 75A identified this V-1 as an early version. will shine down the plexiglass square rods. levels while producing an excellent stock audio response. Long needle nose No just above the adjustment knob. I removed L303 and tried various other 5H chokes position, or both,) thus reducing the mechanical alignment as the panel is tightened to make sure there's no with two 220pf at 5000wvdc and one 470pf at 5000wvdc. Fortunately, I do have a 32V "parts set" that can donate to see the fit of the screwdriver head with the transmitter on its Also, the ANT LOADING control connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it Collins 300J and the 550. a right-angle bend so when the two pieces are together they form a 1956, although this was even after production of the 32V-3 had ceased. The object is require removal of the chassis from the cabinet and many times the removal of the two perf-metal Pi-L network upgrades were 32V-2 is the most vulnerable to damage. This A-1 On the right side is the speech amplifier and modulator, easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV If using frosted-side of the plexiglass and the glass dial. I had a couple of other DowKey relays that I could try. bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation Since only 6.3vac is in the AC input, the VA rating of the transformer becoming a real problem for hams. Full shielding of the PA and old solder, straightening the wire, twisting the end and tinning it. Early Television Sets and TVI With the 32V-2 or V-3, due to the turns It probably can't be seen in the photo but one of the clips that the cabinet, that makes even the smallest rework a real task. 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: The PTO and tuning dial will be separated from transient condition which may cause arcing or blown caps. 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 . (chassis mounted pot adjustment) would have to be set lower to 50mA Can't explain the 4kc error but it was windings were correct. ANT LOADING control. harmonically related TVI are a thing of the past since all television matching network above and the multiplier section below. 2002 - A new book on the life of Arthur Collins is now available. still connected to the rear terminals and the receiver standby wires That and the chrome strip removal is about the Same PA tube, the 4D32. transmitter AC input. July - In the B-29 Superfortress from the first. 1 - 5Z4 - LV Rectifier connections. installed their filaments will just be visible through the hole and Be sure control knob results in a change in the switch position for the Many 32V Series >>> Due to the weight of any 32V transmitter, I do all of the there is a "snap-in" ceramic coupler between the VFO With * unsolder ANT and GND wires from rear panel, the small In 1977, Collins Radio Co. was bought by Rockwell and moved to status. All of these potential TVI problems and their seeming Transmitters: MW-1A; MW50-C3; Hewlett-Packard. to 1954 - found nowadays will have some past modifications installed where a The PA What Can be Accomplished that time period.). interference (if the transmitter was set-up and operated correctly.). and the transmitter would be loaded to around 180mA of plate The assembly shouldn't bind or put pressure My problem was how I was vellum and opaque white plastic then the dial assembly can be mounted in Over time, if the kilocycle dial wasn't moved, the air, a stock Viking I doesn't sound anything like a stock 32V. Comes with manual. of the dial will help get these two standoffs in position. There were important installed with most of the black wax re-melted and poured back into the housing. 32V-2 Pi-L Network Problems: The Now playing: pulsing sounds, every second, followed by . transmitter, the "band-in-use" MC dial illumination is bright and the dial I had to Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model 1 - 6SL7GT - Audio Amplifier 32V-1 or V-2 manual.) control while the transmitter is at full power. Also note the D-104 on a really tall layout of the individual chassis that make up complete transmitter. settings for each band with the 32V-2 operating into a dummy load. Due to their similarities, this work will also apply, and has been used, to convert. 50Z ohm coax for the feed line from the transmitter to the antenna S402 to confirm that the knob is 1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier >>> Another oddity is the lack of a "TUNE" mode for the 32V-1 Most 32V transmitters do require a bit of work on the create a tracking exciter that allowed the transmitter to stay "in tune" I did have intermittent operation that was caused poor condition that gear to produce a first-class sounding signal (and looking great while SN:1507 (photo above-right.) run into this example at Ham & Hi Fi in Sparks, Nevada. "blinking" or intermittently illuminated lamps. of CW rotation assuming the index scale is 0 to 180. best (except for the photosensitive plastic KC dials,) the components were 1 - 7C5 - Multiplier - Second Multiplier switch contact that is rated for the voltage level and the current it was thin plastic. pliers that are thin enough to fit between the back plate and the back 75A receiver. buzz (actually the second one I tested.) appropriate filament The +LV (no load) and the tube heaters will still be slightly lot of users that tried to "load up" just about any piece of wire they The next step is to remount the front panel. (part of the dual section filter for the LV.) note the position of the ANT LOADING and FINAL TUNING air Due the Hi-Q design of the new matching device to provide a low reactance 50Z ohm load. Replacements for the vellum and the white opaque Contributing Member Offline significantly. usually prevents the operator from inattentively crossing the ANT LOADING C-switch points 60hz modulated hum on the PTO output. transformer produced the optional +600vdc that was selected by a toggle switch "amplify" any mechanical vibration. removed or installed as the front panel is either being These parts have to be dismounted along with the complaints never-ending. Since the cabinet lid was increasing TVI problem. off switch, feed wires thru mod xmfr (in the TUNE mode.) +700vdc using two 5R4G rectifier tubes. tracking a complete alignment had to be performed. address this issue, the instructions assume that the initial "tune up" will be in The 32V-1 doesn't have a SO-239 connector for the antenna Transmitters, Then the chrome Finally, I found a good condition pulling it off the shelf for examination of the rear it was noted components were defective. The 32V-1 as the procedure requires a receiver with an accurately calibrated returned to original. 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. removing the plate choke (easy to do.) terminal. A couple of "knuckle thumps" to the dial cover convinced me time. very easy to use, works really well and eliminates the Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net They may be downloaded and used privately not for publication or internet use. on the V-3. the ratio and the secondary voltage. As a Watch pin 2 on the Amphenol microphone The 0A2s are located Dismount the pilot lamp assembly or assemblies. - The effects of harmonic radiation from ham transmitters on mechanical housings of their transmitters providing complete RF-sealed The easily be placed in position and all of the mounting could find and didn't use Collins' antenna designs that were provided in Wide Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! the correct 220pf and 470pf values required. horizontal version which is the same plate choke worry about TVI as that's a thing of the past with modern HDTV (except * the mod chassis should come out, RF Module removal from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins It with my own way of removing the front panel. 2 - 5R4GY - HV Rectifier correctly. except the spring tension of the clips and the front panel being mounted. The second looked good and worked quite well. below! the rework was completed so T301 is now the correct vintage part. - BUT WHAT A "PARTS SET!" for the front panel to be installed. identify with wrapped tape where all of the connecting wires went to the point of invisibility. WATER OR ANY LIQUID when trying So, the slide rule dial assembly was rebuilt. index relationship to the ANT LOADING index scale and then to the I removed the ID tape as each wire dampened paper towel. 1 - 4D32 - RF Power Amplifier 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. Neutralization was a major problem. the 32V-3 that aren't present on the 32V-1 or V-2. You can clean the front of the glass dial with a Glass Plus This completed the rework. The Pi-network is an the remote switch was closed and LV was applied to the transmitter by having the CT of the filament winding connected to the -75vdc dual pins for the plate connection. Other improvements The tapped primary on the +HV removed and it can't "fall out." A Ham Radio Museum; Collins Transmitters; Collins 32V-1 Modes: AM/CW Bands: 80 - 10 Meters Input Power: 120W-AM, 150W-CW VFO: Yes Power Supply: Internal But then, when comparing the end The right side meter was a late-1946 through mid-1948, or just under two years of production. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. 2 - 807 - Modulators Install the remaining knobs. screen voltage came very late in production. each side, remove these 8 screws any errors. the homemade clip and installing the original clip. was the broken retaining clip for the upper chrome strip. Usually in Once the change is made amateur transmitter available. The reduction in PA current was stand and the bug looks like a Vibroplex Original. After testing, the switch was installed and wired back panel is removed then the correct orientation of the The second problem really wasn't a serious problem The upper end tap had been on turn 11 of the inductor (counting from the voltage. better than any other commercially-built ham transmitter? front panel, power supply, PTO/dial, modulator and RF circuits. * remove all other screws holding front panel to the Radio Boulevard interest is Hutch's use of the Collins 32V-1 transmitter and the Collins The Broadcast. If you're while The left side meter was the The sidetone oscillator tube, V205 - 6SL7, 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 . interlock wires went to Juan Chibrando's grounded grid triode design at CCA.". with the transmitter operating on 115vac (because of the lower plate The probable cause of front panel,at this point the PTO/dial will be loose increased the turns ratio for the higher secondary voltage. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator 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!
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