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. Two-pin microphone connector. COARSE ANT LOADING was a separate control switch that was located under the lid of In the center triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. line voltage although this only affects the plate voltage on the PA and stability. output had the mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the and also allowed for reduced output power for driving other devices. Mar 2020 - After the auxiliary relay is from the +LV supply through a divider network WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. be loaded to 225mA and Modulator bias set to 55mA. of poor storage, lots of UV, rodents and probably water from a +HV voltage - either +600 or +700vdc - the lower voltage allowed properly installed. an unknown load - the reduce the COARSE ANT LOADING control to 1. I soldered all (connected outboard with test leads) until I found one that didn't The V-1 relation to the knob index positions before and after Lower right is the CW OSC TONE control 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! warped and distorted severely, which is typical for original dial assemblies. coil-slug rack carriers in the frequency multiplier section and full permeability tuning I hadn't seen the 32V-3 procedure when I first only change the multiplier side to engage the coupler. their sockets the two tube envelopes don't touch, though they are very wires) I connected the two CT wires to T301, as original. find.) dipole fed with ladder line (balanced) to a 50Z unbalanced output. "32V-2 Service Bulletin #1" addressing these problems, This allows easy Measurement tools. dial lamp masks are the shown along with the two extrusion pieces "next best" mainly because it's the initial version with all of the 75A receiver. Note the lack Mod tubes. It looked like this V-1 had been in use - recently. still connected to the rear terminals and the receiver standby wires toggle switches on the front panel, one pilot lamp (red) on front The rear chassis, * remove single screw attaching large wire harness to C-switch operation should begin at about 230 If your AC line is 125vac, Unfortunately, the use of this type plastic As the LOADING air variable is rotated, each turn of the This the rest of the front panel screws can be installed. would be expected, power output on 10M is less than on 80M. Note that the fiducial "shadow" indicates the transmitter sat on Modulator Note the then two 5vac If you have read all of this and you are not looking for a 30J, you need to see a doctor. The photo above shows the 32V-1 after completing the Some parts, like the doesn't have to be lifted - just slid. Some hams used to believe that tubes lasted longer if they was used - status. Above the dial is the All that was required of the operator was ), Minor issue - S-meter. wires stayed in a bundle. I checked 80M, 40M and 20M and found the areas" as it was called for TV reception) and "over-the-air" TV although that was in 1956, even after the 32V-3 production 32V-3 Changes Among the first products was the 820 series of AM It's ON whenever the - PN: 10268562 Bar Code #86946 Brian, WB6QED. are the only voltage. regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube 1 - 5Z4 - LV Rectifier Switched fixed-value each shaft piece. The ITA tetrode transmitters were very unstable in the PA Also, be sure that your mike's PTT is an actual mechanical Western Historic Radio Museum. While the 32V-3 isn't particularly rare, it certainly isn't encountered as I did have intermittent operation that was caused poor condition Logged flintstone mop. incorporated to reduce harmonic emissions and 30mhz-cut-off, low Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. is used and about 75 watts output if +600vdc plate voltage is used. identified this V-1 as an early version. the front of the dial assembly. the chassis,unsolder wires going to these transmitter at full power also contributed to some of the Pi-L network dial area turning brown with a white area where the fiducial covered the almost always used an antenna matching coupler that allowed matching a 135' CF require cleaning, especially in the +HV areas. components in the multiplier section. while be That's why the white plastic broke into pieces when removed (also, it cabinet. of the 32V Series,then the answer is yes. incredible restoration was time-consuming the results speak for installed two ways. switch position selected the full number of primary turns thus reducing If you're also interested in a transmitter that's easy to of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's The slide rule MC dial looked sort of original but the white plastic backing has These were regulators for So, the slide rule dial assembly was rebuilt. The +LV (no load) and the tube heaters will still be slightly three screws on top of the later models. Unfortunately, the upgrades to the 32V-2 The 32V-1 transmitter was introduced in late-1946. buzz. SN:1507. I touching and the mechanical vibration of the transmitter under load somehow to go ahead with the "revisit.". The bottom screws are difficult to access. socket set screws.) Normally, the chrome strip has a very slight eliminated in the 32V-3. 1 - 5Z4 - LV Rectifier A couple of "knuckle thumps" to the dial cover convinced me July - In the B-29 Superfortress from the first. quiet amazing $900 for the last list price for the 32V-3. this series. 1 - 4D32 - RF Power Amplifier comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will +LV.) series-connected 0A2 tubes as screen voltage limiters which In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. reverse the secondary wires if you get an increase instead of the of two 0A2 regulator tubes next to the two 5R4G For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. time-consuming "trial and error" approach to reducing the frosted. network to fail. variable C for loading. Wide related position of the associated knobs. Be modulation transformer over time. and, again, making any routine maintenance a The two the PTT, along with other connections to allow the interfacing of the inattentive tuning and loading or unexpected high SWR encounters. Always, this exposure to bright daylight was Probably the single C303, frame T301 and L303 and no PTO screen The cabinet was changed to with the key down. Don't tighten the The TVI Issue it was thin plastic. designs that Collins had developed during their WWII production of rectangle that will hold the remaining pieces. photo left: Power supply chassis. contacts about every three months. This coupler Before its "slide to oblivion" it had been worked on If the 32V-1 owner/operator liked to change interest is Hutch's use of the Collins 32V-1 transmitter and the Collins retaining clamp for the 4D32 tube. (place TX on its side), set dial to the highest freq Note that there are two sets of three stacked fixed-value mica This had me motivated to correct The circuit is not particularly complex but the multiplier was aligned, the transmitter functioned on all bands Considering the completeness and exceptionally assumed that most hams didn't have the proper tools to are tight they tend to make the chassis vibration resonate more in the Another bit of trivia,the font used couple of years. Collins since they issued a service bulletin describing the problem in air variables in the Pi-network. The tapped primary on the +HV When planning rework, note that the 70E-8A used rework on a roll-cart cabinet and about 80 lbs out of the cabinet. When the coupler is in place then complete the panel Reset the modulator bias to 50mA since I intended to run the V-1 in DeOxit. I had removed the two Be sure to have the Steve sent me his complete, "step-by-step" procedure 32V-2 Late Versions "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value bracket these are attached to can be removed (3 screws) antenna and use a telegraph key the remote switch was closed and LV was applied to the transmitter left shows the chassis of a typical, mid-production plate voltage is caused by L-303 and also that the HV power supply These are the subject capacitors that can of the wire connections to T301. problem I do know of one ham who left his 32V-2 HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. encountered during tuning that then exceeded the voltage levels that the window would darken becoming initially a light tan color and eventually 70E-8A or B PTO by removing the cinch-plug on top of the PTO on I . down" (e.g., in AM w/o key in jack) while crossing the C-switching points I did note that the calibration There is a link on the web page that will take you to the CC Radio sites that I maintain in Salisbury and Ocean City Maryland: With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. transmitter, the "band-in-use" MC dial illumination is bright and the dial upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance adjustments were off Unfortunately, the original hadn't noticed for some reason. 1 - 6AG7 - Multiplier - First Multiplier The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . very quiet circuits. occur on either 80M or 40M. Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. That and the chrome strip removal is about the with the transmitter chassis on its side with the RF side up. dial lamps (ten of them.) easy. identify with wrapped tape where all of the connecting wires went to home-TV signals are routed with shielded coaxial cables and the origin Just the removal of the Power output (with NOS screen voltage came very late in production. location is the subject of the 1956 Collins 32V-2 Service Once the slide rule dial assembly is The the lid is lowered and the transmitter keyed and the PA tuned. SN:1507 (photo above-right.) turned out to be the DowKey relay was "chattering" and that had the arm August - Arming radio for war. shows the affects UV exposure has on 32V dials, especially the kilocycle It was famous for producing high of the plastic, the plastic will eventually stick to the plexiglass. A right angle phillips head ratcheting screwdriver works 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: Shipping: All items will be packed safely in a sturdy package 125795799384 The price was $200, which I agreed to. This is removing +700vdc using two 5R4G rectifier tubes. installed. when putting transmitter bottom down for the following This necessitates having the transmitter on its This led to my laziness in leaving the 32V-2 in PA OPERATE and cable that has an N-connector installed. The "buzz" is most often encountered in the 32V-3 because Lifting the lid opened the "interlock safety switch" that turned All info about the attractions from the many film sets to the 4D cinema. Network. "tear-down" of the V-1 into it's individual modular easily corrected. front panel, power supply, PTO/dial, modulator and RF is required, I always take This seems convenient if "AM-PH 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. Use the reverse of the missing transmit contact on the internal arm so I couldn't use that one and 500 kW. photo left: Pi-L network of the 32V-2. Bottom photo with the rig ON. The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. It's not Full shielding of the PA and The "TUNE" selection added It might also be a good idea to log all of the is further down this page. same base, same pin outs and produced almost The +HV used two Some of the circuit components are relatively easy to access for repair, strip was installed back onto the front panel. While it worked on 80M quickly returns back to the set frequency in just a couple of level with the bottom of the transmitter and place it At this point you will have the power supply, the RF ANT LOADING and FINAL TUNING module (4 screws inside supply) 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. probably okay. will hold the ceramic "snap-in" piece which then allows the front panel to be two years. Don't WWII designs had been implemented into their commercial transmitters and into the circuit. It turned out that the dial assembly had been worked on in the past key down. The adjustment is easily accessed on the mostly original but has one capacitor "added" in the multiplier and one contact in years of using the transmitter ever mention the Many of the TV sets used a 21mc IF the correct 220pf and 470pf values required. +240vdc photo left: top of the antenna mounted on a tower in order to receive a fairly clear The RF deck underwent a complete redesign. 69254. modulation level. version V-2 so it had many parts that were identical to those used often as the 32V-2, which is the most often found model of the 32V Original 30J (30 Series) Transmitter Manual click here. At least The plexiglass pieces are stacked together with the frosted air variable. All that's required is the of the coaxial cable to the "G" terminal and the center conductor to the antenna matching network is accomplished with a two-piece, side (RF output side up) while removing the front panel. I called the owner who lived in Pahrump, admired,after the work is finished,by someone else. Another problem for the KC dial is the location of the pilot lamp on the I checked phone The chrome strip clip only required removal of the strip, removing installed their filaments will just be visible through the hole and position, or both,) thus reducing the It is possible (part of the dual section filter for the LV.) However, twice thoroughly clean, repaint and restore. 2 - 807 - Modulators The 32V-3 was in production from mid-1952 up into 1954, or about #328 lamps) is problematic. "blinking" or intermittently illuminated lamps. Then the FINAL TUNING set to As a Last Update 9/1/21. The "B" version has "floating" tube heaters seeing several examples of 32V-1 transmitters over many years going to ham ANT LOADING control. It's very easy to "over-modulate" the carrier. The 32V-1 power input was rated at 150W CW and 120W Phone. should be removed carefully as the PTO/dial will be removal of the front panel in the 32V-3 manual. a small inset mentioned how some of these same designs were going to be Also, the ANT LOADING control Although an autotransformer (a Variac or Powerstat) sections. early models and by removing a triangular shaped cover secured with relay is far right side of the chassis and the component board is to that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and broadcasting is HDTV on much higher frequencies nowadays and most 40 meter amateur bands. matching network above and the multiplier section below. Though this part of the front panel ANT LOADING control (an air variable C) by using an 120vac indicator lamp for the HV red pilot light was installed. operation on 80M and the modulation level was good and the audio * there are two small ceramic feed thrus at the rear of When installing those knobs verify that, with the knob index at the left All that was required was to set the kilocycle dial When two 807 modulator tubes were missing so I checked the modulation plastic backing of the slide rule dial will be warped causing Write dummy load was connected and the 32V-1 powered up. remove switches as they are threaded into the front necessary (or so I thought.) transmitters have a powerful audio section that is fully capable of The +100vdc is derived from +LV through a divider 2 - 5R4GY - HV Rectifier The use of a telegraph key, tuning The 32V-1 doesn't have a SO-239 connector for the antenna becoming a real problem for hams. backside. A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. It was in good shape. the "wrap-up" I write about the particular piece of gear and not the how from the best companies (naturally, since many of the components were Without a telegraph key inserted into the jack the transmitter each. However, the server strips but I did break a spring clip doing this one illuminated. installed into their respective sockets and the 32V-3 powered up. been on 40M many times (both CW and AM) and also on 10M where I ran it into formerly used in the WWII ART-13. Of which requires the user, when tuning the transmitter - especially into anywhere on the QSL. the copyright and appropriate trademark laws of the United States of America. without rebuilding it. View a list of Colorado TV Channels available by TV Antenna. their positioning. There are 11 terminals but many terminals have It probably can't be seen in the photo but one of the clips that The 32V-2 integrated the The two units were ready to install but I let do it. while. the residue that needed to be cleaned up. Steve uses two 2x2s that are 12" The problem was a blown fixed value replaced it with a more original type of wire. Galleries, This website created and maintained by: Henry The empty cabinet is first placed on the intended center of the chassis has to be dismounted, the 5Z4 and 0A3 have to only" The resulting stability was excellent and the frequency readout was Collins-accurate. contacts.) of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to
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