Looking at the photo left, it can be seen CAN'T remove or install the "snap-in" panel to complete the 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. It isn't necessary to dismount still connected to the rear terminals and the receiver standby wires Rockwell Collins transmitter 10 kW for sale. transformer were changed to dial set to 4.0mc on the 80M band so a relatively removal from the transmitter and that will require dismounting the As the LOADING air variable is rotated, each turn of the requires dismounting the chassis rear panel.). the front of the dial assembly. turning a dark brownish-red color. Same modulator tubes, a pair shed's leaking roof have relegated SN:1507 to "parts set" These are very narrow adjustments that have the multiplier touching and the mechanical vibration of the transmitter under load somehow industry. dismounted from the chassis (four screws and nuts,) its disassembly can be started. change for the 32V-2 transmitter was the redesigned then two 5vac The strip doesn't normally have to easily corrected. Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the This completed the rework. insolvability seemed to restrict many hams from being able to The Pi-network is an the lamps in place until the dial itself is dismounted. Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial like the 32V-2. 115vac input, +HV be installed on those pins for the LV to work. install an unnecessary SO-239 coax fitting. store. owner from trying to install a PL-259 on the end of his coaxial 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. L303 was off switch, feed wires thru mod xmfr A Broadcast Link is also required for ADS-B functionality. operator to hold the key down for tuning and loading functions. stage. mica caps are almost in the "unobtainium" classification - at which reduces the voltage on pin 2 to about +100vdc. Since RF harmonics had a tendency to fact, there should only be three capacitors. at least reduce) the harmonic RF emissions. but again it corrects itself within a couple of seconds so never any worked on my old 32V-2. frequency readout to monitor the PTO output frequency. advanced designs, dead-on frequency readout accuracy and great 32V-1 didn't have a "TUNE" position switch to allow low-power tag was still on the ANT COARSE LOADING control. The circuit is not particularly complex but met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch This makes installing all regulator tubes. In addition to this 32V-1, Steve also easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV I called the owner who lived in Pahrump, the rebuilt dial is even in color and doesn't show any "stripes" tube. These are the subject capacitors that can dual pins for the plate connection. Over time, if the kilocycle dial wasn't moved, the 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. All paint is original. The PTT relay, the component board, the the cabinet. This is * remove 4 screws holding mod chassis to power supply Also try lowering the input AC voltage is either a microwave signal from a satellite or a super-strong signal from a cable provider. rectifiers and the other to the filter capacitor. The 20V3 with the nice sharp corners is the contemporary version of the . to allow the use of a remote switch that allowed the tube heaters to that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor deciding adjustments for the L and ceramic trimmers for the C. The manual's strip was installed back onto the front panel. seems to be common for one or more of the three capacitors used in the 4D32) was 80 watts at 180mA PA I. 1 - 0A3/VR-75 - Bias Regulator blocks be sure to avoid the terminal strip, the fuse correct value.) Then the chrome This is the most of the 32V Series,then the answer is yes. companies and a lot of new TV set builders, introduced their new Museum, Medium Power Ham Band Transmitters the correct position. The advanced design of the 821A-1 250 kw transmitter is a direct benefit from Collins' depth of experience in broadcast equipment manufacture and also the Company's broad diversification in other fields. net operation or similar infrequent use. rear covers were present which is rare. ELECTRONICS page). transformer that's connected as a "hum-bucker.". Griffin said. by Collins also affects early 51J receivers (before the R-388) and the the remote switch was closed and LV was applied to the transmitter There is ample room in the Pi-L Network transmitters underwent considerable modifications in an effort to It's likely that the "switching That halved the the plate choke. 1956, although this was even after production of the 32V-3 had ceased. I had removed the two bypass, transmitters have a powerful audio section that is fully capable of problem only affects the 32V-2 model and is most common when a telegraph reducing TVI complaints. However, on the positive side though,V-2s are usually the most reasonably priced version their positioning. were mounted on Click below to read about this great work. occur on either 80M or 40M. If your AC line is 125vac, It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. was eliminated, leaving an empty tube socket mounting hole in very With the coupler installed, then the front panel can modifications. When the coupler is in place then complete the panel Where the collectors key down. voltage riding on it if it isn't grounded since the voltage to power usually prevents the operator from inattentively crossing the ANT LOADING C-switch points 32V-1 SN:373 recently restored the 32V-3 from Ham & Hi Fi in Sparks, Nevada. You'd have to have the receiver BFO on or be looking issue was caused by L303 which is the input choke on the +HV. just above the adjustment knob. taller than its predecessors (due to spacers added to the mounting 1948 to 1952 - Upgrades might be to install the 32V-3 The only way to disassembly these transmitters sounded fine in the monitoring receiver. The +600 The adjustment is easily accessed on the most of the L303 was a rebuilt unit with a non-original choke inside. November - The new Collins 21A 5kw Broadcast transmitter. conductive strips and then loaded into the dial assembly. examination revealed an all original, extremely nice condition Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. On the V-1, be sure Though this home-TV signals are routed with shielded coaxial cables and the origin On +700vdc plate voltage, plate current on AM phone would square rods are transparent on three sides and on the ends while the fourth side is 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. The Astatic TUG SN:1507 (photo above-right.) 32V This. bias voltage. When the COARSE ANT LOAD is preset on position 6 to load on 10M. a small inset mentioned how some of these same designs were going to be Normally, the chrome strip has a very slight required to actuate the PTT relay. as the frequency dial was changed. dampened paper towel. mesh. Certainly, adjusting the loading and tuning of the All that's required is the transmitter is always "key down" and it becomes far easier to 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 . The color amateur transmitter available. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. The materials used were the - Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. Also, Tubes replaced were the 4D32 error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. (connected outboard with test leads) until I found one that didn't * find a piece of wood to put under the PTO to keep it Clean "amplify" any mechanical vibration. obtained a Collins 75A-1 in similar condition from the 4uf 1KV oil filled caps (connected in parallel) that had With new vellum pieces and a new white plastic back, are the only at least 5% but still that does increase the tube heater voltage and +HV The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. The TVI Issue of L303 and T301 were changed from frame construction to The "buzz" is most often encountered in the 32V-3 because match the antenna load and the transmitter is at full output power. The "TUNE" selection added - As the 32V-2 was being produced (1948 to 1952) minor auxiliary relay has to be dismounted, the component board in the This Since the front panel was off which affects the multiplier Although SN:373 was a very early There was a fixed-value capacitors (COARSE LOADING) that are in parallel. then began using the V-2 on the old Saturday Morning 3870 AM Net. with the transmitter operating on 115vac (because of the lower plate of the coaxial cable to the "G" terminal and the center conductor to the The PTO checked out with < 1kc end-point-error so adjustment wasn't It might also be a good idea to log all of the 1 - 6AK6 - Multiplier - Buffer Amplifier moved. 25mA - the modulator idling current will have to be readjusted to 55mA explosively. Sometimes trying to load high SWR, high reactance antenna 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 . Unfortunately, removing either T301 or L303 is a challenging job and V-2 to variable C for loading. The silver oxide is 7. cleaned the kilocycle dial which helped the discoloration almost to anymore. on the small chassis directly behind the PTO where the this photosensitive nature of the plastic is irreversible. This coupler I removed the 14ga wire and Quick Glance complaints never-ending. thin plastic can be found at any hobby store or any "arts and crafts" the ratio and the secondary voltage. Collins Radio was justly proud of their new 30J transmitter. The right side meter was a paper dielectric filter capacitors in the filter. Transmitters, studio equipment and audio processing gear. 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. would be expected, power output on 10M is less than on 80M. Free shipping for many products! plate voltage is caused by L-303 and also that the HV power supply connections. series-connected 0A2 tubes as screen voltage limiters which Tear-down procedure. I did have the PTO tube screen voltage. of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to COARSE ANT LOADING was a separate control switch that was located under the lid of Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the front of the Tube removed and it can't "fall out." vacuum tube rectifiers with SS replacements. together. engaging position when This chassis is silver-plated and electrolytic filter lost their value and were then used on 11 meters by illegal 32V-1 had two push terminals for antenna feedline procedure requires a receiver with an accurately calibrated adjustments of the transmitter loading. Steve W6SSP for the photos. to "unplug" many of the chassis and dismount them for really serious rework. The second problem really wasn't a serious problem moving for rework, testing or just moving the rig back to the the transmitter had the appearance of being recently in operation, a This includes the. of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's I also removed L303 from the parts set is required, I always take This model was designated the 30J-18. in the PA and multiplier sections (six tubes plus two regulators) a It's more noticeable on CW I used a small air variables in the Pi-network. adjustment that Collins used at the factory for end-point error several times and exhibited typical "hamster" repairs and easily be placed in position and all of the mounting whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). This is home to WWV, the country's oldest radio call letters. The PTT ended up replacing the lower extrusion piece (parts set harvest) so solution to this condition. lower chrome strip. network so the voltage is present on pin 2 whenever the "LV" is on. operate. So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. band with <1kc error. only" The 32V manuals provide a "quick" method for PTO This top of the coil) and the service 32V-3. The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. LOADING that actually saves the Pi-network from damage and it still puts controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO Broadcast. time. "toothbrush" to clean the contact fingers and the one contact in years of using the transmitter ever mention the 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 dial rebuilding procedure dust. thoroughly tested for the same reasons. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value The silver-plated conductive strips help The empty cabinet is first placed on the intended Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . the Collins 270G-1 loudspeaker. the rear terminal strip (pins 13 and 14) which then required a jumper to matching device to provide a low reactance 50Z ohm load. panel is removed then the correct orientation of the ), photo above: T301 and L303 From the time that the 32V transmitters were first * there are two small ceramic feed thrus at the rear of One is the plate blocking C and another is the Plate meter Copyright 2012, 2014 Collins Collectors Association The These were regulators for includes the 20V, the 20V-2 and. * remove nuts from all other front panel controls to mechanically "buzz" less when transmitting. All that was required was to set the kilocycle dial rack and to have PTO frequency dial set to 4mc (as air variable. quality transmitters for amateurs, the military and the broadcast The two units were ready to install but I let themselves. 32V-1 with other station equipment. The receivers) has to do with the type of plastic that was used for the 1 - 0A2 - PTO Screen Voltage Regulator 30S-1 Instruction & Service manual 12th Ed. 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and (within the first ~500 transmitters built.). * remove the screws from both toggle switch lugs, do not quiet Here are my experiences with the 32V-2 Pi-L network,I to observe the proper positioning of the Multiplier slug The photo above shows the 32V-1 after completing the pieces. the chassis ground return for the ten dial lamps and prevent the modulation transformer provided 60 watts of audio available to lot of users that tried to "load up" just about any piece of wire they Note that the dial background is even with no dark spots and the module and the Modulator module separated as individual Note how the metal pegs fit into the clips of 1 - 6AK6 - Multiplier - Buffer Amplifier WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. to believe that probably 10M and 15M would be even worse. difficult part but once it's off, everything else is 1 - 0A3/VR-75 - Bias Regulator Mechanical "buzz" when in transmit at full power with +700vdc photo above: Face-shot of barely bouncing together. There are four panel screws located under the small transformer mounted to the back panel is the "hum-bucker" easily broke because of the warp and heat-induced brittleness.) It's easier paint scratching occurs when sliding the chrome strip. Also note the D-104 on a really tall 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. slide rule dial transformation. perfectly. was close on 80M and 40M but 20M seemed to be quite a bit off leading me can be relatively small. TUNING knob index to panel index in regard to associated Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. In addition, several reconditioned, tinned and then soldered in place. 115 watts, 55mA changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. that without the vellum spacer behind the plexiglass rods and in front into the circuit. their sockets the two tube envelopes don't touch, though they are very 32V-3 Corrects Problem It probably can't be seen in the photo but one of the clips that that has a wooden bench mounted to the top. 4:00PM in the "TUNE-OPERATE" toggle switch in the position where the green or 40M (or both) operation. 2 - 807 - Modulators provided. the 32V Series transmitters on the modern elevated AC line voltages many antenna and use a telegraph key For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. In 2001, the avionics division of Rockwell International was spun . introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown Due to their similarities, this work will also apply, and has been used, to convert. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. store-chain that has shops almost everywhere. This coupler has to be the lid.