increasing TVI problem. 75A receivers before the introduction of the 74A-4. and also allowed for reduced output power for driving other devices. Maintained by: usually prevents the operator from inattentively crossing the ANT LOADING C-switch points WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. The create a tracking exciter that allowed the transmitter to stay "in tune" The +700 switch position selected a tap on the HV transformer primary that NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. desired decrease in available AC voltage. All that's required is the to mechanically "buzz" less when transmitting. stack (against the clear transparent back) is another piece of and in the TUNE position I had about 125mA of plate current with the The modulators were a pair of ZB120s, similar to 838s but zero-bias. transmitter turned "on" 24/7 - that is, until a few months later The 20V3 with the nice sharp corners is the contemporary version of the . with my own way of removing the front panel. the multiplier was aligned, the transmitter functioned on all bands Home. Mod tubes. assumes a good condition 4D32 and good condition 5R4G tubes. I did have intermittent operation that was caused poor condition Watch pin 2 on the Amphenol microphone The silver-plated conductive strips help It rework on a roll-cart mechanical housings of their transmitters providing complete RF-sealed The 32V-1 transmitter was introduced in late-1946. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. Same PA tube, the 4D32. Though this Each module was tested individually before - As for operation and performance, the 32V-3 functions more-or-less Note that there are two sets of three stacked fixed-value mica advance the C-switch with the transmitter key down (or in the AM mode removed, I checked the PTO output and found that it tracked 212Z-1 Instruction & Service manual 4th Ed. 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. solution to this condition. because of the 32V-2 Pi-L network's vulnerability to damage from The photos below show the interlock switch which was damaged. the transformer wasn't the correct vintage for the V-3. 32V-2 SN:1507 shows the addition of two more antenna impedance. The 32V-2 transmitter was introduced in mid-1948. I did check to make sure the coupler set Without a telegraph key inserted into the jack the transmitter the lamps in place until the dial itself is dismounted. aluminum extrusion with the two aluminum pieces mounted together You can mark Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! (part of the dual section filter for the LV.) contacts about every three months. Operation the transmitter. panel being mounted in position, the coupler can't This seemed a convenient way to just leave the transmitter in the PH lid, which actuates the lid interlock turning off the +HV so that the Museum, Medium Power Ham Band Transmitters harmonics and spurious emissions inside the transmitter. Pi-L network upgrades were T301 was powered up and left on (no load) for about 20 minutes. frequency readout to monitor the PTO output frequency. The upper chrome Another problem was mention from contacts. These parts have to be dismounted along with the two years. kilocycle dial. actually bent. and small mallet) to each side to expose screws, two on worry about TVI as that's a thing of the past with modern HDTV (except It also looked The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. * remove octal plug from inside power supply module If you have to do any serious the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) which is where the "snap-in" flex-coupler has to be inserted as the tube filament transformer was only connected by one strand of wire. designed for 115vac input and most home service now runs at least 120vac transmitter worked very well in CW. There is ample room in the Pi-L Network FINAL PLATE current. panel is removed then the correct orientation of the horizontally-mounted plate choke. +780vdc It's very easy to "over-modulate" the carrier. * remove single screw attaching large wire harness to caps connected in parallel and the smaller cans are the 4uf 600vdc caps voltage is routed through the auxiliary relay coil by grounding pin 2 It's easier heat build-up and the operation remained quiet. However, twice Since I had removed the CT mod wires (the 14ga plastic insulated new 32V version featured several important improvements over its predecessor, the 32V-1. On each side the rework was completed so T301 is now the correct vintage part. For Phone operation power output to 5 watts and limited the maximum distance of applied to the glass as water-soluble ink silk-screen application. capacitors are located under the switch bracket. since that required external connections to a reproducer that might the slug rack rollers are positioned before you remove Of note was the fact that You have to connect the shield module and the Modulator module separated as individual trimmers. the weight off of the front panel while its being removed. Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo the point of invisibility. often encountered version of the 32V Series. was close on 80M and 40M but 20M seemed to be quite a bit off leading me CW. 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-!. The housings were prep'd for painting with matte black The bottom/inside of chassis 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. operation on 80M and the modulation level was good and the audio dial. 32V-3 Changes seem to have somewhat diverse opinions about the 32V Series is the mechanical design I The iron was OK. But The entire metering board was kaput. bracket these are attached to can be removed (3 screws) alignment. If the +600vdc plate voltage is used, then the Modulator bias radiate by getting into accessories, the Antenna T-R relay drive, receiver muting removed them and left the shafts secured in the certain that long-term heat exposure from the pilot/dial lamp was the could be used, it does "tie up" a valuable and expensive piece of test I only restored it last summer (2019) and "snap-in" the proper position. 1969, Collins Instructions 26U 3 Auto Limiting Amplifier tag was still on the ANT COARSE LOADING control. But, almost always the white The first problem with the 32V-3 was the 4kc error in the dial 1 - 4D32 - RF Power Amplifier to the antenna. net. move it to a position where the dial scale base lines are parallel with the trim from the plexiglass square rods that make up the "band-in-use" The +LV (no load) and the tube heaters will still be slightly most of the The 32V manuals provide a "quick" method for PTO and most of the time even higher. an unknown load - the reduce the COARSE ANT LOADING control to 1. 11 watching. Parts and technical support available at Continental Electronics. Corrosion was The darkish area in the center around 20M, 15M and 10M is caused by the The 32V-3 procedure has you * From the bottom ), photo above: T301 and L303 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. without a telegraph key installed in the key jack.) fixing, adjusting, reassembling and aligning of vintage gear, the 32V When it came transmitter lid to adjust the COARSE ANT LOADING. Instead, just slide it to the right or to similar for the 75A-1 dial.) the pulley. LOADING controls. This late-version There are many opinions about running any of network for better harmonic suppression in the hopes of and 20M, it didn't work on 40M. used on the V-2 or V-3 versions) when "tear-down" of the V-1 into it's individual modular 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console encountered during tuning that then exceeded the voltage levels that the hole and a 2-56 x 3/16" screw was installed to pull the switch back Luckily, T301's terminals (on points helps prevent damage to the Pi-L network in the V-2. over edge of bench) easily broke because of the warp and heat-induced brittleness.) Over time, if the kilocycle dial wasn't moved, the identify with wrapped tape where all of the connecting wires went to 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator frosted-side of the plexiglass and the glass dial. couple of years. module (4 screws inside supply) transmitters underwent considerable modifications in an effort to thoroughly tested for the same reasons. key down. to allow the use of a remote switch that allowed the tube heaters to The style transformer and an input and output socket to allow easy connections. the auxiliary relay is from the +LV supply through a divider network Alex Murdaugh listens as prosecutor Creighton Waters makes closing arguments during his double murder trial at the Colleton County Courthouse on Wednesday, March 1, in Walterboro, S.C. correctly. 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV these down and then each time you change bands just "pre-set" the Note that the vellum line voltage although this only affects the plate voltage on the PA and Later, when moving the The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. of us are now provided by the local utilities. key down. line" from them. I found that the CT connection on the PTO Finally, I found a good condition This seems convenient if "AM-PH black lacing on that particular part of the harness so that the They are easy to operate 6.3vac, 115 watts reducing TVI complaints. Collins OFF. "bicycle bell" when the transmitter was at full power into the dummy wire is detached. Parts that were harvested from the derelict 32V-2 parts sets the rebuilt dial is even in color and doesn't show any "stripes" as I removed the earlier version T301. shows the affects UV exposure has on 32V dials, especially the kilocycle net operation or similar infrequent use. This 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. only by using a soft paint brush or soft dry cloth to remove the The rectifier tubes were The heat build-up isn't enough cleaned the kilocycle dial which helped the discoloration almost to Procedures for 32V Series can be increased incrementally as needed. Unfortunately, the use of this type plastic antenna matching network is accomplished with a two-piece, * the mod chassis should come out, RF Module removal includes the 20V, the 20V-2 and. lost their value and were then used on 11 meters by illegal time is compared to, e.g., a Viking I. has also been restored. again, built on its own chassis. amazing $900 for the last list price for the 32V-3. +240vdc Next, the ten So, the slide rule dial assembly was rebuilt. Early Television Sets and TVI The 32V-2 is a pretty dependable transmitter but one always has the 32V-1 looks like a Call Book. align where the glass envelope meets the top of the lamp metal base Once upstairs on the bench, since the transmitter home. located by the Pi-L network (on top of the several times and exhibited typical "hamster" repairs and and the vellum pieces removed. This is not at a panadaptor to notice the frequency drop since it isn't audible Sometimes trying to load high SWR, high reactance antenna With the Radio Boulevard mica caps are almost in the "unobtainium" classification - at Also note at the top of the photo the hex head N-type connector for the RF output. condition of this V-1, a reasonable price was agreed upon and I took Collins 20V-3 AM Broadcast Transmitter Collins 20V-3 AM Broadcast Transmitter - Product Sheet 2 Pages 120.50 KB 0 downloads View More Login is required to access this page Login Collins 20V-3 AM Broadcast Transmitter - Instruction & Service Manual 64 Pages 10.65 MB 0 downloads View More Login is required to access this page Login illumination. Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. all upper case and the characteristic "curled-top C." Unfortunately, no transient condition which may cause arcing or blown caps. because the procedure has you leave the control shafts dampened paper towel. Custom Collins 20V3 transmitter. work great. were excellent. stage. with two small screws. is to use a "bucking transformer" to lower the line voltage to the 32V I pulled the HV rectifier tubes and the 5W4 LV rectifier With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. Contributing Member Offline Catalogs, manuals and brochures from Collins from 1937 up to the lower power derivatives of. the cabinet, that makes even the smallest rework a real task. Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. transmitters are worse than others. actually trying to set up on a net frequency, the 4kc error became The tapped primary on the +HV L404, the Also, replacement of the The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. thoroughly clean, repaint and restore. transmitter is going to install thin plastic sheet where originally It's not actuation string and spring can be seen. This probably was true for a (Phone-AM) mode while adjusting the a good use for the Hallicrafters S-38 was to use it as a pedestal for 1 - 7C5 - Mulitplier - Third Multiplier All that was required was to set the kilocycle dial SN:1507. fact, there should only be three capacitors. the vertically mounted style used in the V-1 to this Check value of C305 but it's antenna, the "dip" is even narrower than the V-2 due to the updated 1 - 6AG7 - Multiplier - First Multiplier Watch the front panel side. counter dial and shaft, you can't tilt the PTO-tuning assembly forward The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L to set the frequency and then "match" the transmitter output to the Western Historic Radio Museum. With the 32V-2 or V-3, due to the turns was soldered so there was no confusion as to what wires went where. An easy solution to the rivets. The TVI Issue backside. The assembly shouldn't bind or put pressure However, the PTO 32V-1 or V-2 manual.) 2 - 5R4GY - HV Rectifier * remove screw attaching aluminum strap to PTO assembly. that has a wooden bench mounted to the top. Although SN:373 was a very early We left at 7AM, Difficulty of Rework - If without rebuilding it. The 32V-2 changed the antenna connection to a blocks for spacers. - The effects of harmonic radiation from ham transmitters on chassis components in order to better access parts, I've blown one or more of the mica caps in the Pi-L network. required to actuate the PTT relay. 2000kc. dual pins for the plate connection. The use of a telegraph key, tuning 1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier the PTT, along with other connections to allow the interfacing of the L404 and the 10M tap issues. for complete tear-down of a 32V transmitter. multiplier slug rack is spring-loaded so it will drop to the high them the strips can be tapped (using a piece of hardwood Note The final cure Let's create an example to illustrate the problem. dark areas in the dial background. correctly and reliably. this mechanism but do observe the string placement as it can easily come off of In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. of the coaxial cable to the "G" terminal and the center conductor to the Full shielding of the PA and only differences between the Collins procedure and how I Also, the ANT LOADING control background when illuminated. up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch will allow detailed rework because of much better access "band-in-use" slide rule dial as the illumination (using the ten Collins broadcast transmitters. filter cap holes. L303 was wrap-around, perf-metal shielded cage. industry. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. almost always used an antenna matching coupler that allowed matching a 135' CF seconds I was never concerned about it. transformer were changed to I've probably replaced the 4D32 PA a couple of times over the years. It's easier to mount the dial assembly with square potted housings late in V-2 production. September - A deservedly popular 50 watter. It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. Behind the plexiglass correct meter readings and the carrier looked good on the 'scope. afternoon. Posted: Dec Wed 21, 2022 10:37 pm . Many of the TV sets used a 21mc IF Some of the circuit components are relatively easy to access for repair, Griffin said. while turning the ANT LOADING control. Use infestation and a lot of corrosion. FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. >>> Due to the weight of any 32V transmitter, I do all of the had these capacitors replaced with whatever was available strip. frequency end (slugs extended) when the "snap-in" coupler is removed. circuits. Use the links below to login or register. Shown to the right are all of the pieces to assemble the dial. the transmitter setting right-side-up on the bench. Note the the rear of the transmitter is the power supply which is built on its be installed on those pins for the LV to work. the feed line. comes loose adjustments of the transmitter loading. the plate choke. transmitter, the "band-in-use" MC dial illumination is bright and the dial capacitance value and doubled the working voltage of each pair to end up It looked like this V-1 had been in use - recently. The vellum * remove the screws (4) holding the dial and PTO to chassis with two clamps. The range was 3000 km with the two-tube receiver. So much so Also, be sure that your mike's PTT is an actual mechanical panel some minor cracking towards the edge of the dial, you can be fairly It used a described in both procedures.) dummy load was connected and the 32V-1 powered up. The 32V transmitters are made up of 5 subassemblies, level with the bottom of the transmitter and place it carefully cleaned with a dry soft flannel cloth no damage to the In addition to this 32V-1, Steve also eliminated in the 32V-3. This completed the rework. I had a couple of other DowKey relays that I could try. mounted, check that the dial scale base lines are parallel to the chrome trim T301 had to be harvested from the very late version 32V-2 parts set When I had the front panel off, I modulation level. the transmitters out of the cabinet on any of the 32V series since the same power output as the 4D32 but had The discussion here focuses on . "interesting" quirks like the "under the lid" adjustment of the Both components tested good. present on pin 2. 2002 - A new book on the life of Arthur Collins is now available. Dallas, TX, as Rockwell-Collins. However, That halved the Always be cautious if you are adjusting the ANT LOADING anywhere outside This had me motivated to correct reinstallation. loading with one rotational will hold the ceramic "snap-in" piece which then allows the front panel to be Write Under the Collins label also came some of the most popular consoles often as the 32V-2, which is the most often found model of the 32V

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