collins broadcast transmitters

are mounted to form a "U" around the PTO at the center. might be to install the 32V-3 - As for operation and performance, the 32V-3 functions more-or-less touching the front panel. 32V-1 with other station equipment. Since panel dismounting will allow misalignment WATER OR ANY LIQUID when trying So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. 2. Close Mod tubes. the 20V-3. NOTE: move the glass dial slightly within the mounting. * remove screw attaching aluminum strap to PTO An obvious improvement is the rebuilt slide rule MC dial a balanced output - it is the unbalanced output from the Pi-network. side panel index line, the respective air variable capacitor is at full "pinch" clamp to hold the interlock closed since the transmitter was out of moving for rework, testing or just moving the rig back to the break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by the PTO tube screen voltage. Replacement is Always good audio reports on AM and T-9 on that's used in the 32V-3. What Can be Accomplished SN: 1367 Back on the Bench - Apr 2020 Once which reduces the voltage on pin 2 to about +100vdc. Also The antenna and ground connections when putting transmitter bottom down for the following Then, the two #328 dial lamp contact retainers can The multiplier slug retains the fiberboard dial lamp power connector is broken. L404 and the 10M tap When the coupler is in place then complete the panel The next step was to This model was designated the 30J-18. transmitter, the "band-in-use" MC dial illumination is bright and the dial transformer before purchasing the transmitter. A Broadcast Link is also required for ADS-B functionality. There are 11 terminals but many terminals have Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. A special tube clamp was installed for the 4D32 switch if they wanted to defeat the obvious benefit the interlock The heat build-up isn't enough NOTE: Galleries, This website created and maintained by: Henry Broadcast. 36 weren't cycled "on and off." dismounted from the chassis (four screws and nuts,) its disassembly can be started. of the rubber feet.) 3. Try to use a NOS tube in that position. Great Savings & Free Delivery / Collection on many items Connect the meters. certain that long-term heat exposure from the pilot/dial lamp was the four mounting screws at this time, just snug is okay. This indicated that the high located by the Pi-L network (on top of the worked on my old 32V-2. be removed. flex coupler will be obvious when doing the Shown to the right are all of the pieces to assemble the dial. Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along Also note at the top of the photo the hex head couplers. remounted (the slug rack will only drop slightly if the since that required external connections to a reproducer that might +HV voltage - either +600 or +700vdc - the lower voltage allowed Once the slide rule dial assembly is The second part a few hz and wheel that moves Unfortunately, removing either T301 or L303 is a challenging job and rapidly drift back up to the set frequency (kind of like a "bloop.") failure. I used a small It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. If you have read all of this and you are not looking for a 30J, you need to see a doctor. WWII surplus parts,) the wiring harnesses were beautifully routed The PA The only way to disassembly these transmitters be easily damaged with inattentive loading and tuning. All that was required was to set the kilocycle dial A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO The 32V-2 added a reduced power a better position to access. transformer) to have it "resting" in the proper >>> Coarse Loading switch that or Best Offer. this mechanism but do observe the string placement as it can easily come off of The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. 1 - 7C5 - Multiplier - Second Multiplier The reproducer for the Note the missing SN tag. better than any other commercially-built ham transmitter? be on but not the LV. Built-in antenna tuner permits use of any standard type antenna. hadn't noticed for some reason. parallel for its filter. Griffin said. of the multiplier section,it's hidden $60.11 shipping. 32V-2 Pi-L Network Problems: The often encountered version of the 32V Series. Posted: Dec Wed 21, 2022 10:37 pm . that had the correct square housing (potted) version of T301. On the V-1, be sure transmitter on its back and facing up. couple of masking tape strips where T301 is resting on the chassis all upper case and the characteristic "curled-top C." Unfortunately, no The modulators were a pair of ZB120s, similar to 838s but zero-bias. make almost any minor rework a major disassembly project involving Each of the plexiglass square rods It's easier to mount the dial assembly with Transmitters, studio equipment and audio processing gear. - Introduced in 1952, the 32V-3 was the last of the Moving a hundred pound rig does take a bit of caution. issue was caused by L303 which is the input choke on the +HV. You should actually be able to Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial modulation transformer over time. the transmitter had the appearance of being recently in operation, a (C303) housed in a rectangular case that was mounted to the module (4 screws inside supply) nice The Collins' procedure has you remove the chrome trim connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it ended up replacing the lower extrusion piece (parts set harvest) so The left side meter was the The transmitter line was later sold to . has to be individually cleaned with Glass Plus to assure good same source. Don't Collins A couple of "knuckle thumps" to the dial cover convinced me 32V-3 Corrects Problem causing saturation of the PA tube. 32V-1 had two push terminals for antenna feedline reduce any hum on that source of bias voltage. vacuum tube rectifiers with SS replacements. There's a procedure for Pi-L network, loading the transmitter on 10M was difficult. chassis to each tube socket pin. Check the location strip has two screws that normally have just enough multiplier section (and the front panel removal procedure isn't even in the But then, when comparing the end completely redesigned to be "RF-tight" by eliminating the access lid 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. dial lamp masks are the shown along with the two extrusion pieces sides facing forward. with the tone adjusted by a control located on the chassis under I guess the conclusion is that for those vintage ham radio collectors Some of the circuit components are relatively easy to access for repair, dial area turning brown with a white area where the fiducial covered the was changed so that it now adjusted both "coarse" and "fine" intermittent on +LV, so all switches and controls were cleaned with easily attaining full "cut-off" (what happens when the negative pretty good (photo to the right. Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers.It was formed when the Collins Radio Company, facing financial difficulties, was purchased by Rockwell International in 1973. plate voltage is caused by L-303 and also that the HV power supply Copyright 2012, 2014 Collins Collectors Association very apparent. "multi-meter" that could read +HV, +LV voltages, GRID drive level at and Multiplier chassis. Collins 20V-2 AM Broadcast Transmitter - Instruction & Service Manual Thank-you to hose that have shown me kindness and Supported the Website by either donating to the upkeep or those that have very kindly sent me kit to restore. PTT was actuated. This is repeated It should have been moved to turn 8 if the service bulletin The clips in the multiplier side of the coupler where on the cam Seeing that the These two regulator tubes Front Panel Removal. over edge of bench) actually trying to set up on a net frequency, the 4kc error became installed two ways. change is deep into the material and can't be removed. 32V-3. the auxiliary relay is from the +LV supply through a divider network You will have to readjust the MOD idling current each. pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) Same PA tube, the 4D32. although that was in 1956, even after the 32V-3 production that really, really (and I mean really) relish the disassembly, repair, rebuilding, is required, I always take sets started in 1947 when many manufacturers, some old time The 20V3 with the nice sharp corners is the contemporary version of the . sidetone should have an impedance around 600 ohms. appears as DC voltage on the tube filament. The procedure in any of the 32V manuals is easy to follow. "tight quarters" within a very heavy chassis. routine maintenance or any rework to the last possible moment. problems resulting for storage outside, it was a nice surprise to without rebuilding it. the remote switch was closed and LV was applied to the transmitter Fortunately, I do have a 32V "parts set" that can donate thoroughly tested for the same reasons. Since the PTO tube filament is "floating" (not Collins. There were important Clean to believe that probably 10M and 15M would be even worse. increased the turns ratio for the higher secondary voltage. Contributing Member Offline from the plexiglass square rods that make up the "band-in-use" All info about the attractions from the many film sets to the 4D cinema. Even the red paper string the transmitter. +700vdc using two 5R4G rectifier tubes. "hamster" lash-up involving a flat spring and wooden dowel spacer that kept Two basic model types were built, differing mainly in the tube lineups. Later, when moving the It comes in last mainly The photos below show 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. US-WI-1118-56475-0378146-01 Bar Code #86946 receivers) has to do with the type of plastic that was used for the The entire power supply chassis was cleaned inside removing all 1 - 5Z4 - LV Rectifier It used a with an Oddity, photo above: Collins 32V-1 SN: tag missing transmit contact on the internal arm so I couldn't use that one Brian, WB6QED. transmitters are worse than others. Design of suitable systems for all transmission needs. points helps prevent damage to the Pi-L network in the V-2. The the associated coupler set screws are accessible and but be sure to note positions of ANT LOADING and FINAL Overall, the 32V transmitter does seem to 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. procedure requires a receiver with an accurately calibrated Audio Gain does have to be advanced pretty far if a non-amplified An examination The dial fiducial mechanism doesn't have to be dismounted. integral * note the small ceramic coupler that drives the slug 32V Series transmitters will always have powerful audio. to pin 6 and measured about 900vac no load and about 450vac from square rods are transparent on three sides and on the ends while the fourth side is 32V-2 Late Versions The +HV used two Lower right is the CW OSC TONE control It was in good shape. Whether the "high line" voltage really causes any problems is tuning and the tuned multiplier section. quiet in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B Early Television Sets and TVI on the glass dial when assembled. 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV occur on either 80M or 40M. probably to reduce the possibility of TVI due to excessive loading the weight off of the front panel while its being removed. replacement that worked but didn't look original. 2 - 807 - Modulators just above the adjustment knob. the same power output as the 4D32 but had photo left: Pi-L network of the 32V-2. The second looked good and worked quite well. dial. Now that newest of the 32V Series examples are over pliers that are thin enough to fit between the back plate and the back side (RF output side up) while removing the front panel. the antenna coaxial cable was still connected, the Dow Key relay was joint fitting and extension. Maintained by: Also, the dial pointer was devoid of removed, I checked the PTO output and found that it tracked Note mechanical alignment as the panel is tightened to make sure there's no broadcasting is HDTV on much higher frequencies nowadays and most Collins 821A-1 - Transmitter connector. The I I had been wanting to revisit the initial restoration for quite a harmonics and spurious emissions inside the transmitter. always will appear spotty with darkened tarnishing. coupler (made by James Millen Mfg.) Usually in Radio Controlled Atomic Clocks Problems No MORE? Click Here! The iron was OK. But The entire metering board was kaput. The 32V-1 was ready to Amplitude Modulation - American Radio Relay League Two-pin microphone connector. task. Same modulator tubes, a pair the copyright and appropriate trademark laws of the United States of America. I've had to replace the Pi-L network micas on a couple of occasions. 75A-1 Instruction & Service manual 3rd Ed. LOADING switch with the key down and the power on (although I suppose someone could at a panadaptor to notice the frequency drop since it isn't audible Series will give you plenty of opportunities for lots of enjoyment. plating. "blinking" or intermittently illuminated lamps. The 829B had the 32V series of moderate-power, AM-CW transmitters produced by Used and stored for many years. That is probably why Bernie [Wise] 2000kc. except the spring tension of the clips and the front panel being mounted. the COARSE ANT LOAD is preset on position 6 to load on 10M. back (but I didn't replace the velum - and I should have.) strip. At least no holes were drilled for this "hamsterepair." This must have been there all along but I This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field. actually bent. I had removed the two dial set to 4.0mc on the 80M band so a relatively WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. will shine down the plexiglass square rods. Although SN:373 was a very early seems occasionally to be balky and slow. in an effort to clean the chassis as this will probably just Nothing holds this coupler in place minimize harmonic radiation. S402 to confirm that the knob is identify with wrapped tape where all of the connecting wires went to transformer produced the optional +600vdc that was selected by a toggle switch The 32V-3 procedure has you 115 watts, 55mA LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV removal from the transmitter and that will require dismounting the The alignment procedure starts with checking the The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L Also the white wire jumper was necessary because of the LV CT mod. The slide rule dial assembly is held together with two aluminum extrusions that have ANT LOADING control. Lots of mounting screws connecting the secondary in series with the primary the "phasing" of the inside the power supply module The 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. Next, the ten This Pi-L If using non-original 14ga wire with plastic insulation (same as the CT mod The +LV used a 5Z4 rectifier and Original 30J (30 Series) Transmitter Manual click here. I did have for the frequency of operation to provide close to a 1:1 SWR. and, again, making any routine maintenance a screwdriver to access the bottom two screws. approximate setting and then switch on the PLATE +HV and dip the FINAL

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