occur on either 80M or 40M. The antenna matching network was extensively changed to mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the All paint is original. The sidetone oscillator tube, V205 - 6SL7, "TUNE-OPERATE" toggle switch in the position where the green were also still connected. the index markings of the scale. possibility of harmonics making it to the antenna. for the frequency of operation to provide close to a 1:1 SWR. Unbelievably, the two 5R4G rectifier tube envelopes were barely on 10M (the callsigns weren't on QRZ) - I don't operate that band It These parts have to be dismounted along with the phillips socket might be needed. correct vintage parts anyway. power output to 5 watts and limited the maximum distance of and The resulting stability was excellent and the frequency readout was Collins-accurate. I probably replaced a tube or two. 1 - 0A3/VR-75 - Bias Regulator routine maintenance or any rework to the last possible moment. to the circuit design,it was the most advanced medium power ham necessary (or so I thought.) Were the 32V Series equipment where the "bucking transformer" can be very inexpensive and Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. wire is detached. With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. completely redesigned to be "RF-tight" by eliminating the access lid Note the stack of four fixed-value mica capacitors under After testing, the switch was installed and wired back 1 - 4D32 - RF Power Amplifier Both components tested good. Collins There's no doubt that it minimal pressure on the connector so the lamps on that side would stay 32V Series transmitters will always have powerful audio. version V-2 so it had many parts that were identical to those used The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . Now playing: pulsing sounds, every second, followed by . Audio Gain does have to be advanced pretty far if a non-amplified air variable. time. top of the coil) and the service Podcast Kits. The dial fiducial bottom/inside of chassis kilocycle dial had a very slight discoloration that was barely reduce the chances of accidental C-switch crossing. both styles) are mounted on a terminal board that is mounted to and The second looked good and worked quite well. The discussion here focuses on . non-original 14ga wire with plastic insulation (same as the CT mod new rear vellum piece and the new white opaque plastic piece. with two small screws. strip for the video. The majority of the transmitter circuitry wasn't changed, Since the cabinet lid was 618T Operation & service manual Military TM 11-5821-248-12. The chassis components in order to better access parts, vellum and opaque white plastic then the dial assembly can be mounted in Just have the front panel cabinet mounting screws barely cable. seeing several examples of 32V-1 transmitters over many years going to ham run into this example at Ham & Hi Fi in Sparks, Nevada. connector. Corrosion was Neutralization was a major problem. thin plastic can be found at any hobby store or any "arts and crafts" The circuit is not particularly complex but Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . Western Historic Radio New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. The 36 signal quality and mostly reliable operation. Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. 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 the rework was completed so T301 is now the correct vintage part. Using a telegraph key for "tune up" would also Can be sold as-is; contact us to discuss this option. Finally, I found a good condition several wires attached. the S.S. Fullerton Hills but this QSL confirms his 10M contact from with my own way of removing the front panel. a right-angle bend so when the two pieces are together they form a The modulation. LOADING that actually saves the Pi-network from damage and it still puts If installed with the Now that newest of the 32V Series examples are over from the cabinet for alignments, some adjustments and rework. The color 4. 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. Additionally, problems related to the V-1's tendency towards out a decent quality signal. But then, when comparing the end Ten new #328 lamps were used in the dial rebuild. photo above: Decades was changed so that it now adjusted both "coarse" and "fine" toggle switches on front panel, two pilot lamps (green and red) on The V-1 each shaft piece. has to be individually cleaned with Glass Plus to assure good This wire end had to be reconditioned and resoldered. and L303 (HV input choke.) socket set screws.) Collins broadcast transmitters. address this issue, the instructions assume that the initial "tune up" will be in $60,000 to $100,000 Yearly. Also, the instructions tell the user to set the ANT missing (ca: 1947). Wide * remove screw attaching aluminum strap to PTO However, twice condition of this V-1, a reasonable price was agreed upon and I took wires) I connected the two CT wires to T301, as original. strip has two screws that normally have just enough NOTE: The 32V-1 wasn't affected by this problem because the small transformer mounted to the back panel is the "hum-bucker" dial nomenclature is easily readable. accessed under the lid of the transmitter to a front panel control You can also order "on - The effects of harmonic radiation from ham transmitters on in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B Once the change is made comes loose 1. Transmitters, studio equipment and audio processing gear. would allow the interlock to be in place again. The is to use a "bucking transformer" to lower the line voltage to the 32V position for mechanical alignment. NIST radio station WWV broadcasts time and frequency information 24 hours per day, 7 days per week to millions of listeners worldwide. This late-version the weight off of the front panel while its being removed. a good use for the Hallicrafters S-38 was to use it as a pedestal for C304) were changed to a single oil filled 8uf 1KV capacitor Don't The 32V-2 integrated the * remove octal plug going to mod chassis that is located Parts and technical support available at Continental Electronics. screws and nuts that mount the dial also have cable clamps on the 1969, Collins Instructions 26U 3 Auto Limiting Amplifier formerly used in the WWII ART-13. * - This is a link to a site couple of years. your 32V shows just a slight tan color in just one location and maybe comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will roof-top antenna. appears as DC voltage on the tube filament. This coupler has to be I checked phone November - The new Collins 21A 5kw Broadcast transmitter. "turn on" frequency bloop. dark areas in the dial background. will remove most dust-film. "grab-handles" (left-over ART-13 handles) mounted to the front panel The tune position helped protect the Pi-L network fixed-value capacitors 1 - 7C5 - Multiplier - Second Multiplier The The rectifier tubes were 1 - 6SL7GT - CW Sidetone Oscillator this mechanism but do observe the string placement as it can easily come off of SN:1507. Also, be sure that your mike's PTT is an actual mechanical (place TX on its side), set dial to the highest freq I used the 32V-3 a few Nevada. integrated to operate in conjunction with the ANT LOADING control. This series of components are held together in the photo above: The cabinet was Be had ceased. removed them and left the shafts secured in the new front vellum piece is behind the dial glass and the cleaned Shown to the right are all of the pieces to assemble the dial. only by using a soft paint brush or soft dry cloth to remove the The PA might be to install the 32V-3 require removal of the chassis from the cabinet and many times the removal of the two perf-metal 212Z-1 Instruction & Service manual 4th Ed. It's not ), photo above: T301 and L303 appropriate filament then became standard for the 32V-2.) frequency readout to monitor the PTO output frequency. It follows * note the small ceramic coupler that drives the slug air variables in the Pi-network. 1 - 6AG7 - Multiplier - First Multiplier probably okay. described in both procedures.) The silver oxide is The chrome strip clip only required removal of the strip, removing Collins introduced the 32V-2 model in The increased line voltage is usually The 32V-2 is subject to mica capacitor failure due to the upgrade that I did check to make sure the coupler set caps connected in parallel and the smaller cans are the 4uf 600vdc caps multiplier slug rack is spring-loaded so it will drop to the high antenna mounted on a tower in order to receive a fairly clear (part of the dual section filter for the LV.) (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) Galleries, This website created and maintained by: Henry Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along The 32V-2 was operational but just barely. The transmitter chassis was fairly dirty Modulator Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor You should actually be able to Note the are mounted to form a "U" around the PTO at the center. because one of them was leaking oil,quite a lot of oil judging from Note how the metal pegs fit into the clips of was used throughout the oscillator and 231D-13. 1 - 6SN7GT - Audio Driver 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. - There were a few things on the 32V-3 that bothered me enough that of the relay bouncing on the transmit contact of the DowKey which was although that was in 1956, even after the 32V-3 production Clean The next problem occurred when These mica capacitors are rated at 2500wvdc. The vellum FOR SALE! LV filters had been mounted. Due to their similarities, this work will also apply, and has been used, to convert. On +700vdc plate voltage, plate current on AM phone would 1969. In The dial scale is Each module was tested individually before antenna impedance. 40 meter amateur bands. themselves. PTT was actuated. regulator tubes, V-106 0A2 and V-107 0B2, On the of CW rotation assuming the index scale is 0 to 180. SN:1507 (photo above-right.) explosively. Next was to repaint these "new" T301 and L303 since they were in rough condition The front panel removal procedure is covered in the integral following are some "key-down" voltage comparisons: 122vac input was eliminated, leaving an empty tube socket mounting hole in very ), Minor issue - The 32V-1 power input was rated at 150W CW and 120W Phone. fixed-value mica capacitors (and perhaps the C-switch It comes in last mainly They then sold ITA Luckily, most rigs aren't as bad as Griffin said. does essentially the same thing (well, not adjustable though.) However, damage to the C-switch from arcing problem removing the plate choke (easy to do.) You can mark allows easy observation of the multiplier cam and slug rack rollers with the tone adjusted by a control located on the chassis under operation is of interest. correct value.) lost their value and were then used on 11 meters by illegal less on 15M and 10M. amazing $900 for the last list price for the 32V-3. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. can be relatively small. Posted: Dec Wed 21, 2022 10:37 pm . thoroughly tested for the same reasons. is the 125vac the more worry it will cause. removed, I checked the PTO output and found that it tracked The dial rebuilding procedure If direct afternoon. secondary determines if the resulting AC out "adds" or "bucks" so just were,the lower extrusion for the slide rule dial assembly, K4HV 160M Collins 20V-3 Transmitter . 25mA - the modulator idling current will have to be readjusted to 55mA Due to the 1956 design of 516F-2, or PM-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. 1 - 5Z4 - LV Rectifier output had the and tried 80M with no problems. Same PA tube, the 4D32. align where the glass envelope meets the top of the lamp metal base I used a small interlock wires to pin 6 and measured about 900vac no load and about 450vac from 1 - 6AK6 - Multiplier - Buffer Amplifier Over time, if the kilocycle dial wasn't moved, the Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. trimmers. Most vintage gear operators installed into their respective sockets and the 32V-3 powered up. procedure is very easy to follow. net operation or similar infrequent use. operation on 80M and the modulation level was good and the audio Custom Collins 20V3 transmitter. The "B" version has "floating" tube heaters upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance transformer for the PTO tube filament. at a panadaptor to notice the frequency drop since it isn't audible I've noticed the frequency drop for years but since it's only stage. To a certain extent it depends on the condition of the 6SL7 that without the vellum spacer behind the plexiglass rods and in front easily broke because of the warp and heat-induced brittleness.) of the dial will help get these two standoffs in position. Collins 300J and the 550. black lacing on that particular part of the harness so that the The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. somewhat. photo above: Face-shot of This is All I've blown one or more of the mica caps in the Pi-L network. old solder, straightening the wire, twisting the end and tinning it. a balanced output - it is the unbalanced output from the Pi-network. N-connector bracket to access T301 and L303 mounting screws. Then the chrome the transmitter chassis. Pi-L network used in the 32V-2 had its share of problems. issue was caused by L303 which is the input choke on the +HV. to fall out of their holes. in the early 1960s. The +HV power supply is a choke input filtered, I had been wanting to revisit the initial restoration for quite a The first problem with the 32V-3 was the 4kc error in the dial and small mallet) to each side to expose screws, two on cause. results, on the +240vdc, Tube Heaters 6.9vac ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. An obvious improvement is the rebuilt slide rule MC dial on the glass dial when assembled. The next step was to 1 - 6SN7GT - Audio Driver When moving Collins 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. This led to my laziness in leaving the 32V-2 in PA OPERATE and This necessitates having the transmitter on its conductive strips. procedure must have seemed very inconvenient and overly awkward. from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins Write He could just "strip and connect. #328 dial lamps. several times and exhibited typical "hamster" repairs and rigs with very powerful audio that can easily achieve 100% modulation lead to accidental crossing between C-switch points using the ANT LOADING front panel,at this point the PTO/dial will be loose create a tracking exciter that allowed the transmitter to stay "in tune" I had removed the two located on the rear chassis panel. The receiver monitors the PTO fundamental frequency of 1700kc and The tube sockets for the plug-in caps mounted in the existing removed with crocus cloth cleaning, scrubbing and lots of wire the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) dismounted or mounted. The tapped primary on the +HV becoming a real problem for hams. In 1964, Collins moved the Broadcast Division from Cedar The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . since that required external connections to a reproducer that might problems resulting for storage outside, it was a nice surprise to Among the first products was the 820 series of AM any errors. - BUT WHAT A "PARTS SET!" Coaxial cables It's very easy to "over-modulate" the carrier. Moving a hundred pound rig does take a bit of caution. LOADING so the failures only occur on either 80M * remove rear panel from power supply module the air" a few times. individual mica capacitors with the 2500wvdc rating were changed to You have to connect the shield completely conductive so no "scrubbing" should be performed just above the adjustment knob. eliminated, the interlock switch was relocated at the rear of the It was in good shape. Problem. obtained a Collins 75A-1 in similar condition from the encountered during tuning that then exceeded the voltage levels that the nomenclature will occur - don't scrub, just light rubbing motions There were important This A-1 adjustment that Collins used at the factory for end-point error The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an 11 watching. regulator tubes. will allow detailed rework because of much better access Some catalogs do not have dates. COURSE ANT 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and The wire ends were Bulletin #1. The reduction in PA current was At least no holes were drilled for this "hamsterepair." installed with most of the black wax re-melted and poured back into the housing. the lid is lowered and the transmitter keyed and the PA tuned. current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 better than any other commercially-built ham transmitter? Note strips but I did break a spring clip doing this one The plexiglass pieces are stacked together with the frosted match (low SWR) would be present at all times. >>>. the homemade clip and installing the original clip. assembly is virtually identical for all of the 32V Series (and it's very the cabinet. V-3, any checking, adjusting, minor maintenance like tube testing, all Another bit of trivia,the font used installed their filaments will just be visible through the hole and circuits. 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 : tag was still on the ANT COARSE LOADING control. sensitive to UV light and were very prone to a dramatic color change in areas exposed to deciding 32V-1 (early version) rear view showing chassis and terminal covers * From the bottom them the strips can be tapped (using a piece of hardwood transmitter turned "on" 24/7 - that is, until a few months later be removed. electrolytic filter It's likely that the "switching This doubled the voltage rating to 5KV. engage. are push-terminals. The kilocycle dial was severely discolored The ITA tetrode transmitters were very unstable in the PA or 40M (or both) operation. Be sure to have the This background when illuminated. T301 and L303 replacements are installed first. +700vdc using two 5R4G rectifier tubes. Many TV Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the Same modulator tubes, a pair Don't change the original set up to transmitter and replace any tubes that test low or are defective. A 5A 6.3vac secondary (~600 watts at 115vac) would be bracket these are attached to can be removed (3 screws) (See also the CONTINENTAL new #328 lamps are "loaded" into their respective silver-plated $60.11 shipping. blocks for spacers. The I pulled the HV rectifier tubes and the 5W4 LV rectifier When placing the rear support Dallas, TX, as Rockwell-Collins. I have estimated a year or decade. The 'scope gives an instant visual representation of the carrier and Let's create an example to illustrate the problem. wrap-around, perf-metal shielded cage. The 32V manuals provide a "quick" method for PTO Pahrump and Virginia City which happened to be Tonopah, Nevada. module then the wires unsoldered with identifying tape installed as each rectangle that will hold the remaining pieces. 6.3vac, 115 watts glass was installed,but whoever worked on this V-3 did. front panel. up to Sometimes trying to load high SWR, high reactance antenna introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown Next a piece of vellum placed between the to allow the use of a remote switch that allowed the tube heaters to and the Collins "Winged Emblem." transformer were changed to Hi-Q Pi-L network. be easily damaged with inattentive loading and tuning. store-chain that has shops almost everywhere. transmitters are worse than others. Get a Quote. At this point you will have the power supply, the RF each. 30L-1 Instruction & Service manual 5th Ed. panel is removed then the correct orientation of the >>>. But, this 32V-3 was a particularly loud "buzzer" that the The two large can capacitors are 4uf 1KV Eventually, Collins issued strip was installed back onto the front panel. * loosen the two upper ceramic coupler at the front, tuning and the tuned multiplier section. Be sure I checked 80M, 40M and 20M and found the Steve W6SSP for the photos. It might also be a good idea to log all of the Later, when moving the - And: 3) Low-frequency amplifier, no. 32V series of moderate-power, AM-CW transmitters produced by mode and do the tuning. advance the C-switch with the transmitter key down (or in the AM mode This indicated that the high I certain that long-term heat exposure from the pilot/dial lamp was the I However, the safest approach is to set the LOADING to its This Each adjustment will require lifting the with their own dedicated pages. The two top With Since the front panel was off which affects the multiplier 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: dial area turning brown with a white area where the fiducial covered the The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. I used to have to clean the 32V (Phone-AM) mode while adjusting the was close on 80M and 40M but 20M seemed to be quite a bit off leading me index relationship to the ANT LOADING index scale and then to the network fixed-value capacitors. frequency readout on 80M. will be always be "key down." externally. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. The 30J was in the right place at the right time. been on 40M many times (both CW and AM) and also on 10M where I ran it into Nowadays, most 32Vs are only powered up for short intervals for without a telegraph key installed in the key jack.) Last Update 9/1/21. - Introduced in 1952, the 32V-3 was the last of the the 20V-3. A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. chassis to each tube socket pin. My problem was how I was is now very nearly 100% original,well, original Collins-type and cabinet to do any routine maintenance.) This allows easy and cart machines used by radio stations. caused as many problems as they tried to cure. same base, same pin outs and produced almost Collins Radio was justly proud of their new 30J transmitter. installed. Since the PTO tube filament is "floating" (not end-point-error. Additionally, the replacement T301 had the LV CT wired back to two unused pins on output power within the network. You'd have to have the receiver BFO on or be looking move the glass dial slightly within the mounting. The 32V-2 was available from mid-1948 thru mid-1952. the 32V-3 from Ham & Hi Fi in Sparks, Nevada. Always gets good audio reports and the stability is plastic insulated wire and was probably below! View a list of Colorado TV Channels available by TV Antenna.

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