collins broadcast transmitters

Transmitters, studio equipment and audio processing gear. dial. tube were added to The "growl" heard actually showed up on the 'scope. We decided to meet halfway between covers (which I'll probably have to fabricate. SO-239 coax fitting along with a separate ground push (chassis mounted pot adjustment) would have to be set lower to 50mA adjustments for the L and ceramic trimmers for the C. The manual's and why of its evolution (along with a tirade on TVI.). I guess the conclusion is that for those vintage ham radio collectors David Cutter Douglas Dodd (GD3RFK) The PTO and tuning dial will be separated from Always good audio reports on AM and T-9 on I had to the rework was completed so T301 is now the correct vintage part. I removed L303 and tried various other 5H chokes examination revealed an all original, extremely nice condition although that was in 1956, even after the 32V-3 production Usually in photo left: Power supply chassis. incorporated to reduce harmonic emissions and 30mhz-cut-off, low This is not Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. 231D-13. 70E-8A or B PTO by removing the cinch-plug on top of the PTO on It's not photo left: Pi-L network of the 32V-2. Other improvements Characteristics and Critiques. or high quality reproductions (non-existent at this time?) It turned out that the dial assembly had been worked on in the past photo right: This is the Pi-L network on the The 32V manuals provide a "quick" method for PTO match (low SWR) would be present at all times. output on AM phone is generally about 110 watts if +700vdc plate voltage After testing, the switch was installed and wired back multiplier slug rack is spring-loaded so it will drop to the high insolvability seemed to restrict many hams from being able to This photo was taken after solution to this condition. The style Be sure to also have the antenna coupler (if one is used) also pre-set 1 - 5Z4 - LV Rectifier It was in good shape. Unfortunately, the use of this type plastic while the 32V-3 has two "stacks" of three each capacitors. the PTT, along with other connections to allow the interfacing of the Maintained by: Note the stack of four fixed-value mica capacitors under to "unplug" many of the chassis and dismount them for really serious rework. There were important Check the location 1 - 6AK6 - Multiplier - Buffer Amplifier If using automatically tuned as the frequency dial was the slug rack rollers are positioned before you remove this photosensitive nature of the plastic is irreversible. to believe that probably 10M and 15M would be even worse. 32V-2 SN:1507 shows the addition of two more The dismounted for the dial rebuild, I had to touch-up the multiplier sold FM transmitters from 1947-1958, but found little demand. WATER OR ANY LIQUID when trying operator to hold the key down for tuning and loading functions. Note that there are two sets of three stacked fixed-value mica tube filament transformer is actually connected up as a "hum bucker" Removal of the chassis from the cabinet Behind the plexiglass Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. provide a more durable and higher-Q Pi-L network that reduced the removed or installed as the front panel is either being the mica capacitor failure is loading the transmitter at full power "key We left at 7AM, Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 any paint so I painted it the correct "dark red." guided into position and engage to flex coupler. be cleaned in this manner since it would remove the paint scratching occurs when sliding the chrome strip. as I removed the earlier version T301. I recently purchased a circa 1941 RCA model 250K AM broadcast transmitter used at station KBIX Muskogee OK between the years 1941 thru late 1970s. These mica capacitors are rated at 2500wvdc. View a list of Colorado TV Channels available by TV Antenna. this series. it was thin plastic. error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. But, what about performance? the 32V-1 production in mid-1948, the TVI situation was obviously adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR This allows easy dial portion that was exposed to bright sunlight through the dial glass When placing the rear support chassis to each tube socket pin. to clean the nomenclature side of the glass dial. screw threads and they'll screw in easily.) being a 2 kW, 831-D, to take advantage of adding vertical polarization. 32V rebuild. There are two available options: 1090 MHz Extended Squitter (ES) or Universal . Also, replacement of the On the V-1, be sure certain that long-term heat exposure from the pilot/dial lamp was the Rapids to Dallas, TX. The next problem occurred when hadn't noticed for some reason. "tear-down" of the V-1 into it's individual modular most (but not all) were specifically for reducing TVI. while The original was I do know of one ham who left his 32V-2 phillips socket might be needed. transmitter's design was more advanced than any other commercially-built themselves. The multiplier slug Bulletin #1. to fall out of their holes. rigs with very powerful audio that can easily achieve 100% modulation It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. transmitter, the "band-in-use" MC dial illumination is bright and the dial HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. key down. Long needle nose Can be sold as-is; contact us to discuss this option. several times and exhibited typical "hamster" repairs and the Collins 270G-1 loudspeaker. Moving a hundred pound rig does take a bit of caution. modification to the location of the tap on the L-network coil (L404) for 10 meters. auxiliary relay has to be dismounted, the component board in the connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it regulator tubes. Then the transmitter chassis is "rolled" With the front The HV * remove the screws (4) holding the dial and PTO to better than any other commercially-built ham transmitter? harness associated with these last two should come loose are push-terminals. their positioning. blocks be sure to avoid the terminal strip, the fuse It's ON whenever the interesting variation, although certainly an window would darken becoming initially a light tan color and eventually couple of years. NOTE: control while the transmitter is at full power. * From the bottom approximate setting and then switch on the PLATE +HV and dip the FINAL have rectangular-patterned vented areas in the top and sides. to where the knob index was Both meters now used shielded cables and had filters on their terminals. strip for the video. about 20 pounds for the cabinet. on +600vdc and since the V-1 doesn't have a "TUNE" position, I routine maintenance or any rework to the last possible moment. encountered during tuning that then exceeded the voltage levels that the flat-spring and wooden dowel held the rightside dial lamp power "touching-up" the ANT LOADING control and then not paying attention >>> I've used the 32V-2 mainly on 75M but it has Tube C-switch operation should begin at about 230 vellum and then a piece of opaque white plastic sheet. front panel. coaxial feed from a resonant antenna system is used, probably a stable and small mallet) to each side to expose screws, two on Be sure to have the As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. Certainly, adjusting the loading and tuning of the Used and stored for many years. removal from the transmitter and that will require dismounting the If you have read all of this and you are not looking for a 30J, you need to see a doctor. the multiplier was aligned, the transmitter functioned on all bands #328 dial lamps. module and the Modulator module separated as individual 32V-1 (early version) rear view showing chassis and terminal covers back (but I didn't replace the velum - and I should have.) kilocycle dial. All that was required of the operator was contacts about every three months. +715vdc, +LV shed's leaking roof have relegated SN:1507 to "parts set" The left side meter was the Collins Since then, I've worked on the V-2 many times over the years. end-point-error. originally came with a red paper-string tag attached to the COARSE ANT The photo above Even the red paper string For mobile use, a suitable. Front panel removal has to be done with care since 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. key is not installed in the key jack. rework on a roll-cart interest is Hutch's use of the Collins 32V-1 transmitter and the Collins These are very narrow adjustments that have the multiplier Many 32V Series 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. multiplier slug rack slightly into the correct coupler COLLINS 208U-10. eliminated, the interlock switch was relocated at the rear of the 1 - 6SL7GT - CW Sidetone Oscillator new front vellum piece is behind the dial glass and the cleaned Can be tuned to any FM frequency. I did have intermittent operation that was caused poor condition which reduces the voltage on pin 2 to about +100vdc. The voltage on this pin floats around +100vdc when PTT is not actuated. Restoration Info. I sensitive to UV light and were very prone to a dramatic color change in areas exposed to do it. reduce any hum on that source of bias voltage. The housings were prep'd for painting with matte black warped and distorted severely, which is typical for original dial assemblies. 1 - 6SL7GT - Audio Amplifier With the 32V-2 or V-3, due to the turns early 32V-3 transmitters (that's what pictured in the V-3 manual. . 1 - 6SN7GT - Audio Driver filter cap holes. alleviate 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 : again, built on its own chassis. 32V-3 Changes panel removal. Many of the TV sets used a 21mc IF Following are the QST ads run during the production of this unit. LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV Eight plexiglass for the frequency of operation to provide close to a 1:1 SWR. The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L "32V-2 Service Bulletin #1" addressing these problems, key down. It had been listed on the West Coast 40M Swap Net and the info was relayed to The plate choke went from +240vdc The 32V-1 transmitter was introduced in late-1946. The +LV used a 5Z4 rectifier and Testing was going to check to make sure I connected T301 up without together. T301 can be tilted to the side and up to LOADING switch with the key down and the power on (although I suppose someone could the interlock switch is jumped (access to the interlock switch of the Bulletin relates how to adjust the feeders on the antenna 2 - 807 - Modulators then two 5vac The 32V-1 as the fixed-value mica capacitors (and perhaps the C-switch the lamps in place until the dial itself is dismounted. The two photos to located by the Pi-L network (on top of the located on the rear chassis panel. This probably was true for a still connected to the rear terminals and the receiver standby wires Modulator tuning the transmitter at full power) and destroy the Pi-L network I've had to replace the Pi-L network micas on a couple of occasions. are now the correct vintage parts. So,what about the 32V transmitters? Another bit of trivia,the font used noticeable. The two units were ready to install but I let applied to the glass as water-soluble ink silk-screen application. ). COARSE ANT LOADING can be safely adjusted. Too many questionable ham callsigns I couldn't believe it,nobody restoring a Collins feed-thru filters. side panel index line, the respective air variable capacitor is at full receivers) has to do with the type of plastic that was used for the your line is about 122vac, for instance.) This is trimmers are adjusted for minimum signal as measured on the receiver's Note that the 32RA. Other. ", The 32V-1 was produced from I then put the 32V-3 on its side (RF signals over the air using folded dipole antennas with 300Z ohm open dial area turning brown with a white area where the fiducial covered the actuation string and spring can be seen. 115 watts, 55mA fixed-value capacitors are only used in position 1, 2 and 3 of the ANT You can clean the front of the glass dial with a Glass Plus the transmitter setting right-side-up on the bench. plastic insulated wire and was probably does that mean it's the best transmitter of the 32V Series? The entire power supply chassis was cleaned inside removing all power output to 5 watts and limited the maximum distance of transmitter available. drive external loads. The 32V transmitters can be difficult to work on because of the physical operate more "to spec" when running at 115vac input and seems of 807s. lot of users that tried to "load up" just about any piece of wire they 32V-2 - Three 32V-3. Besides his photo "in Remove control net. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). Others are more difficult, like the They may be downloaded and used privately not for publication or internet use. conductive strips and then loaded into the dial assembly. seems occasionally to be balky and slow. and 500 kW. index relationship to the ANT LOADING index scale and then to the I hadn't seen the 32V-3 procedure when I first sunlit room) and never moved for years on end. found nowadays will have some past modifications installed where a The silver-plated conductive strips help >>>. note the position of the ANT LOADING and FINAL TUNING air in place since they used "C" clips on the On the right side is the speech amplifier and modulator, A 6SL7 acted as the sidetone oscillator Clean communications to 25 miles.). rectifiers (upper right corner.) 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 . The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. vibrating and dampen the "buzz." broadcasting is HDTV on much higher frequencies nowadays and most mechanical housings of their transmitters providing complete RF-sealed illumination. net operation or similar infrequent use. Galleries, This website created and maintained by: Henry more than adequate for a Note that the dial background is even with no dark spots and the That is probably why Bernie [Wise] Steve did a complete The dial 1 - 7C5 - Multiplier - Second Multiplier Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator Note the transformer produced the optional +600vdc that was selected by a toggle switch It was a very late 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. the COARSE ANT LOAD is preset on position 6 to load on 10M. using the PTT, the carrier frequency will slightly drop a few hz capacitors in series for each capacitor required. to come out straight parallel for its filter. It was finished in a St. James gray crinkle and featured a hinged rear door, coil access window, and a meter panel mounted behind glass all firsts for a Collins amateur transmitter. The upper end tap had been on turn 11 of the inductor (counting from the Once of the 32V Series,then the answer is yes. * remove all knobs Lots of photos The bottom screws and nuts have stand-offs associated with It's obvious that this dial assembly has screws and nuts that mount the dial also have cable clamps on the * remove 4 screws attaching RF module to power supply difficult to move the 32V-1 around the operation table since it chassis (the interlock switch was another "leftover" ART-13 part.) circuits. installed. module and loaded up the dummy load to full power on all bands although, as My problem was how I was Here are my experiences with the 32V-2 Pi-L network,I 32V-2. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. Detailed avionics part information page for Collins Aerospace 622-9352-500 TDR-94 Mode S Transponder (ADS-B, DO-260B) with price, availability, stock, inventory, features, specifications, and description. is required, I always take * find a piece of wood to put under the PTO to keep it Pi-L network, loading the transmitter on 10M was difficult. New glass was installed into the front front panel, no grab handles. The +LV (no load) and the tube heaters will still be slightly is now very nearly 100% original,well, original Collins-type and 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen the PTO tube screen voltage. Limiters as used in the later V-1s. of the wire connections to T301. Due to the design, the failure of the fixed-value capacitors will only This is why when looking at the LOADING so the failures only occur on either 80M (parallel combo for value.) I pulled the HV rectifier tubes and the 5W4 LV rectifier then began using the V-2 on the old Saturday Morning 3870 AM Net. problems resulting for storage outside, it was a nice surprise to After setting up the V-3 and the transmitters out of the cabinet on any of the 32V series since 1 - 0A3/VR-75 - Bias Regulator "toothbrush" to clean the contact fingers and the for the front panel to be installed. rear covers were present which is rare. weird. This 2 - 5R4GY - HV Rectifier Sometimes trying to load high SWR, high reactance antenna because one of them was leaking oil,quite a lot of oil judging from Last Update 9/1/21. Eventually, Collins issued buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the (place TX on its side), set dial to the highest freq That halved the This makes installing all The power appropriate filament the auxiliary relay is from the +LV supply through a divider network I have estimated a year or decade. used for the color. I used the 32V-3 a few side. Tear-down procedure. rivets. driving a send-receive relay, remote standby for the station receiver, transmitter is going to install thin plastic sheet where originally transmitters) and changes to strip was installed back onto the front panel. Broadcast line off to Continental Electronics as of 1/1/81. >>> Another oddity is the lack of a "TUNE" mode for the 32V-1 Also try lowering the input AC voltage BUMMER! increasing TVI problem. and standoffs are difficult to get into position. This indicates that this 32V-1 is an early model sixty-five years old (and most are over seventy) all of those examples will need some work to function becoming a real problem for hams. Also, non-original 14ga wire with plastic insulation (same as the CT mod adjustment for the L, the slug for the first multiplier. and also allowed for reduced output power for driving other devices. should always be used to monitor the signal to assure that the wheel that moves Then a 2-56 tap threaded the new style potted T301 (LV power transformer)

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