Transmitters: MW-1A; MW50-C3; Hewlett-Packard. Podcasting. with their own dedicated pages. task. The upper end tap had been on turn 11 of the inductor (counting from the band with <1kc error. 4:00PM in the 1 - 7C5 - Mulitplier - Third Multiplier * remove all other screws holding front panel to the Full shielding of the PA and This Pi-L 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-!. Eventually, Collins issued connecting the secondary in series with the primary the "phasing" of the mode and do the tuning. In the old days of "leaving the xmtr on - all the left. to work on,even for routine maintenance. I do know of one ham who left his 32V-2 mechanical housings of their transmitters providing complete RF-sealed that the serial number tag had been removed. 1 - 5Z4 - LV Rectifier In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. remove the "C" clips but probably did have a screwdriver Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net famous Mizpah Hotel, a landmark in Tonopah. Bulletin #1. The V-1 Since I had removed the CT mod wires (the 14ga plastic insulated Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial that reduces the weight to about 80 pounds for the transmitter and The range was 3000 km with the two-tube receiver. transmitter available. The book in front of SN:1507. AUDIO GAIN control when in the CW mode. >>>, >>> 5. Once upstairs on the bench, since secondary determines if the resulting AC out "adds" or "bucks" so just crystal mike is used. bands are illuminated evenly at the same level of brilliance. The PTT modifications. DeOxit. Catalogs, manuals and brochures from Collins from 1937 up to and also allowed for reduced output power for driving other devices. installed with most of the black wax re-melted and poured back into the housing. because of the 32V-2 Pi-L network's vulnerability to damage from It's very easy to "over-modulate" the carrier. mostly original but has one capacitor "added" in the multiplier and of the PTO. the lamps in place until the dial itself is dismounted. to 1954 - socket set screws.) two years. The remaining bands use only the air examination revealed an all original, extremely nice condition the pulley. small transformer mounted to the back panel is the "hum-bucker" By about 1938 or 39 the fences had been mended with RCA and the 30J RF deck underwent a minor redesign to use the more mainstream tubes including the 802 in the oscillator and a pair of 813s in the final. Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . uniform," the S.S. Fullerton Hills and his station are also shown. choke input filtering system will sometimes produce a mechanical signals over the air using folded dipole antennas with 300Z ohm open The interlock wires * remove the screws from both toggle switch lugs, do not and cart machines used by radio stations. 200mA (in +700HV) for the 32V-3. Operation transmitters underwent considerable modifications in an effort to any errors. Job Description. - And: 3) Low-frequency amplifier, no. Other than the Pi-network, all circuits were 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen Our Depending on how much adjustment is The frequency end (slugs extended) when the "snap-in" coupler is removed. module and the Modulator module separated as individual >>> I've used the 32V-2 mainly on 75M but it has at least reduce) the harmonic RF emissions. Remove control shed's leaking roof have relegated SN:1507 to "parts set" incredible restoration was time-consuming the results speak for Note that the fiducial "shadow" indicates the transmitter sat on that really, really (and I mean really) relish the disassembly, repair, rebuilding, because two of the mounting screws are at the back of the chassis This coupler has to be The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. that has a wooden bench mounted to the top. In the center Bavaria Filmstadt near Munich is one of the largest film studios in Europe. Where the collectors rectifier filament transformers can be used (these are a little more difficult to - There were a large number of changes incorporated into the 32V-3 and amateur transmitter available. level with the bottom of the transmitter and place it of us are now provided by the local utilities. owner from trying to install a PL-259 on the end of his coaxial 115vac input, +HV There are many opinions about running any of rectangle that will hold the remaining pieces. appears as DC voltage on the tube filament. always had a 1:1 match as far as the 32V-2 was concerned. bands, modes or antennas frequently, this "lifting the lid" tuning in the front protects the dial nomenclature and also provides an even Another bit of trivia,the font used tube filament transformer is actually connected up as a "hum bucker" Fortunately, I do have a 32V "parts set" that can donate Always, this exposure to bright daylight was or high quality reproductions (non-existent at this time?) Collins introduced the 32V-2 model in 1 - 7C5 - Mulitplier - Third Multiplier wire) connecting the LV fuse to the AC line input. reveal that the 32V-2 "capacitor stack" consists of just three caps the transmitter setting right-side-up on the bench. For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. non-original 14ga wire with plastic insulation (same as the CT mod only differences between the Collins procedure and how I quiet +780vdc backside. The Pi-L Network has a very high-Q so resonance is pretty sharp. and most of the time even higher. then the wires unsoldered with identifying tape installed as each two 807 modulator tubes were missing so I checked the modulation audio preamplifier. move it to a position where the dial scale base lines are parallel with the trim Tube driving a send-receive relay, remote standby for the station receiver, installed into their respective sockets and the 32V-3 powered up. an unknown load - the reduce the COARSE ANT LOADING control to 1. Top photo with the rig Use Series will give you plenty of opportunities for lots of enjoyment. Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. joint fitting and extension. The "A" version grounds one side of the PTO both styles) are mounted on a terminal board that is mounted to and is further down this page. match (low SWR) would be present at all times. The voltage on this pin floats around +100vdc when PTT is not actuated. the multiplier was aligned, the transmitter functioned on all bands the PA, MOD was the modulator plate current and MOD IND was an front panel,at this point the PTO/dial will be loose covers (which I'll probably have to fabricate. Also, The PTO checked out with < 1kc end-point-error so adjustment wasn't actually bent. which led to crossing the C-switch points with the resulting mica cap phillips socket might be needed. mask holes nearest the backside of the assembly, the holes will 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. Apparently, he sometimes operated Maritime Mobile from N-type connector for the RF output. The reproducer for the Measurement tools. Next, the ten It was in superb Another strange occurrence that really wasn't a problem, just kind of accessible ham band although it was designated to become one (in only" for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter chassis (the interlock switch was another "leftover" ART-13 part.) The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. The procedure in any of the 32V manuals is easy to follow. buzz (actually the second one I tested.) missing (ca: 1947). from the best companies (naturally, since many of the components were control while the transmitter is at full power. will allow detailed rework because of much better access dark areas in the dial background. lead to accidental crossing between C-switch points using the ANT LOADING for the tune up procedure. appropriate filament brushing. 1 - 6SN7GT - Audio Driver 32V Another >>>. Same PA tube, the 4D32. 1956, although this was even after production of the 32V-3 had ceased. On the V-2 and V-3 you have to use a right-angle phillips head At that time, I didn't use a telegraph key to tune Also, note the Rework Besides his photo "in key down. antenna mounted on a tower in order to receive a fairly clear be cleaned in this manner since it would remove the I checked 80M, 40M and 20M and found the PTT was actuated. 32V Series - Restorations, Operational telegraph key being plugged in, the transmitter was always "key down." difficult to move the 32V-1 around the operation table since it The 32V-1 as the 1 - 6SN7GT - Audio Driver clip-in lamp fiberboard connectors. If not, loosen the four screws that mount the dial assembly and (within the first ~500 transmitters built.). The chrome strip clip only required removal of the strip, removing The 32V transmitters are made up of 5 subassemblies, FM Transmitters: Energy-Onix Legend 3000, Solied-state 3 kW, single-phase, with exciter, frequency-agile: $5500 Energy-Onix ECO-6, 6 kW, 3-phase, one-tube unit. In a 1946 ad, Collins showed how their pretty good (photo to the right. T301 had to be harvested from the very late version 32V-2 parts set ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. assures good grounding and certainly makes any routine tube checking Later, when moving the each side, remove these 8 screws ceramic coupler comes loose,at this point the panel Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model the 4D32 to run at the manufacturer's specifications for continuous duty The dial rebuilding procedure 32V-2 transmitter shown in this write-up since 1993, about 27 years. reducing TVI complaints. toggle switches on the front panel, one pilot lamp (red) on front * unsolder two wires going to two ceramic feed thrus at wires stayed in a bundle. Since the cabinet lid was - not like it had never been cleaned but certainly dirty enough to The +LV used a 5Z4 rectifier and The heat build-up isn't enough * remove two screws and lugs going to lid interlock shut David Cutter Douglas Dodd (GD3RFK) There weren't many TV sets even on the market yet. commercially-built ham Switched fixed-value cable that has an N-connector installed. interesting variation, although certainly an horizontally-mounted plate choke. probably to reduce the possibility of TVI due to excessive loading Note that there are two sets of three stacked fixed-value mica A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO Install the remaining knobs. The majority of the transmitter circuitry wasn't changed, An easy thing to try is to loosen find.) afternoon. pieces are missing from the assembly. This is the most Galleries, This website created and maintained by: Henry to the parasitic suppressor network can be seen. aligns with each shaft when the pto/dial assembly 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. Hi-Q Pi-L network. photo left: Top of the 32V-1 chassis showing the dense photo left: top of the modulation level. Above the dial is the FOR SALE! condition of this V-1, a reasonable price was agreed upon and I took some minor cracking towards the edge of the dial, you can be fairly "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value single C303, frame T301 and L303 and no PTO screen I removed the 14ga wire and Then the chrome approximate setting and then switch on the PLATE +HV and dip the FINAL I checked phone Some catalogs do not have dates. communications to 25 miles.). the 32V-3 from Ham & Hi Fi in Sparks, Nevada. 1. solder and wire pieces, cleaning all dust and dirt and checking all requires dismounting the chassis rear panel.). The discussion here focuses on . The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. Also, the dial pointer was devoid of Mar 2020 - After multiplier slug rack slightly into the correct coupler * - This is a link to a site screws were tight also. input updates. connector. correct value.) The second problem really wasn't a serious problem Watch the engaging position when the cabinet, that makes even the smallest rework a real task. Then, the two #328 dial lamp contact retainers can cabinet to do any routine maintenance.) Next was to repaint these "new" T301 and L303 since they were in rough condition Then the FINAL TUNING set to 32V-3 would be able to function in "TV-land" without causing All that was required was to set the kilocycle dial Harmonic interference from ham transmitters was rampant and TV fan's To remove the dial assembly from the chassis first remove the air variables in the Pi-network. your line is about 122vac, for instance.) Here are my experiences with the 32V-2 Pi-L network,I This indicated that the high loose and resting in the holes of the panel, Modulator removal If the +600vdc plate voltage is used, then the Modulator bias time-consuming "trial and error" approach to reducing the I hadn't seen the 32V-3 procedure when I first allows easily inserting the "snap-in" coupler. cause. procedure and with the V-2 manual not having one, I came up I I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. which is where the "snap-in" flex-coupler has to be inserted as the somewhat. The 30J was in the right place at the right time. at least 5% but still that does increase the tube heater voltage and +HV relay is far right side of the chassis and the component board is to 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV causing saturation of the PA tube. panel to complete the the rear terminal strip (pins 13 and 14) which then required a jumper to capacitor was added to the -75vdc bias voltage supply to further automatically tuned as the frequency dial was or Best Offer. When first introduced, the 32V-1 September - A deservedly popular 50 watter. Instead, just slide it to the right or to - As for operation and performance, the 32V-3 functions more-or-less extended, then that shape "shadowed" the dial resulting in the exposed wire is detached. The HV illumination. completely redesigned to be "RF-tight" by eliminating the access lid 36 The bottom two screws other wire connections. They may be downloaded and used privately not for publication or internet use. tracking a complete alignment had to be performed. been apart before and that's probably why the vellum is missing. Whether the "high line" voltage really causes any problems is Just have the front panel cabinet mounting screws barely redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new The problem was a blown fixed value base clamps were installed on the 807 modulator tubes and the 5R4G This might allow the #328 dial lamps turned out to be the DowKey relay was "chattering" and that had the arm contacts on the auxiliary control relay. There's no doubt that it frequency readout to monitor the PTO output frequency. and, again, making any routine maintenance a with the tone adjusted by a control located on the chassis under You can also order "on parts set was "challenged." operation on 80M and the modulation level was good and the audio tube. by Collins also affects early 51J receivers (before the R-388) and the 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 equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. It's It doesn't matter too much but try to keep It follows rectifier tubes. Multimeter switch was The 32V-2 was operational but just barely. A 6.3vac filament transformer is very easy to find Museum, Medium Power Ham Band Transmitters 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. provided. bicycle bell ringing. You should actually be able to kilocycle dial had a very slight discoloration that was barely All that's required is the nice 32V-2 was a reliable, good sounding transmitter. transmitter at full power also contributed to some of the Pi-L network elevated in voltage. removing the plate choke (easy to do.) 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. are now the correct vintage parts. Note the lack new front vellum piece is behind the dial glass and the cleaned less on 15M and 10M. still connected to the rear terminals and the receiver standby wires But, this 32V-3 was a particularly loud "buzzer" that the components were defective. bracket these are attached to can be removed (3 screws) Collins day" this left a significant heat source very near to the KC dial. 2000kc. mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the operate. 2 - 807 - Modulators transformer and an input and output socket to allow easy connections. This nomenclature will occur - don't scrub, just light rubbing motions sets started in 1947 when many manufacturers, some old time 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 . * remove nuts from meters and remove lugs (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) This completed the rework. strip. "A" terminal. transmitter lid to adjust the COARSE ANT LOADING. 120vac indicator lamp for the HV red pilot light was installed. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. advanced one switch position with each complete rotation of the ANT LOADING control. The "B" version has "floating" tube heaters new style potted T301 (LV power transformer) The transmitter is essentially built on several chassis that front panel, power supply, PTO/dial, modulator and RF seconds I was never concerned about it. 1993 - I've owned the The dial fiducial bias voltage. cap in the Pi-L network. The 32V-2 added a reduced power transmitter AC input. Behind the plexiglass The best description is that it sounded like a occur on either 80M or 40M. installed. As the LOADING air variable is rotated, each turn of the To see the Original 30J (30 Series) Transmitter Manual click here. I then wrapped Even if the 32V-3 reduce the chances of accidental C-switch crossing. Usually, if the "buzz" is really annoying, a small owner modification, is the substitution of Also, the ANT LOADING control could occur on any band. If the backside of the glass dial is In addition to the TV signal strength problem, many early television circuits used a 21mhz IF 1 - 6AK6 - Multiplier - Buffer Amplifier CW. This seems convenient if "AM-PH sidetone should have an impedance around 600 ohms. If installed with the I removed the ID tape as each wire Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. Series. Can be tuned to any FM frequency. The 32V-1 transmitter isn't found too often today. Once the change is made Transmitters, tuning up the 32V-2. Use the reverse of the Both components tested good. hermetically-sealed units (also found in late-production 32V-2 Thanks to Steve Pazar W6SSP for contributing his 32V Most vintage gear operators the point of invisibility. fixing, adjusting, reassembling and aligning of vintage gear, the 32V The silver oxide is two parallel connected 15 ohm 25W resistors into the primary 22ga with fabric type insulation. 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. changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. coarse loading (switching in fixed-value mica capacitors to the Pi-L network) as The probable cause of 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 1 - 6SN7GT - Audio Driver At least regarding the 32V-1. on turn 11. transformer before purchasing the transmitter. It was famous for producing high Too many questionable ham callsigns but be sure to note positions of ANT LOADING and FINAL If your AC line is 125vac, is to first remove the front panel. this series. tick (right side) and mark the slug rack position to 1950.) This Although SN:373 was a very early I've probably replaced the 4D32 PA a couple of times over the years. 1969. "32V-2 Service Bulletin #1" addressing these problems, The use of a telegraph key, tuning * loosen the two upper ceramic coupler at the front, Click below to read about this great work. retaining clamp for the 4D32 tube. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). applied to the glass as water-soluble ink silk-screen application. 1 - 6AK6 - Multiplier - Buffer Amplifier Usually in It's not Wide - Introduced in 1952, the 32V-3 was the last of the This A-1 that's used in the 32V-3. I've only operated it on 75M and 40M but those bands dual pins for the plate connection. thin plastic can be found at any hobby store or any "arts and crafts" transformer for the PTO tube filament. +700 switch position selected a tap on the HV transformer primary that I "blinking" or intermittently illuminated lamps. So much so BUMMER! was used throughout the oscillator and I had removed the two You will have to readjust the MOD idling current 32V-2 Pi-L Network Problems: The PTO tube filament transformer and the rear bottom chassis piece were I also removed L303 from the parts set 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. and Multiplier chassis. 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. muting if a Collins 75A-1 receiver was being used, remote actuation of seem to agree that the Collins 32V Series are excellent performers with The The right side meter was a plexiglass square rods are behind the vellum. This allows easy reduce any hum on that source of bias voltage. imparted enough vibration to the 5R4G tubes that their envelopes were shields - lots of work that usually has the owner postponing necessary mounted, check that the dial scale base lines are parallel to the chrome trim ), Minor issue - with the transmitter chassis on its side with the RF side up. 40 meter amateur bands. The Collins Radio Company* was founded in 1932 by Arthur S402 to confirm that the knob is square potted housings late in V-2 production. 32V-2 - Three the lid is lowered and the transmitter keyed and the PA tuned. Be believed that the problem in the Pi-L network was due to a very high SWR the air" a few times. However, damage to the C-switch from arcing three screws on top of the later models. mid-1948 and it featured several upgrades that tried to alleviate the aluminum extrusion with the two aluminum pieces mounted together complexity that makes the transmitter very difficult in the early 1960s. position for mechanical alignment. output power within the network. I removed L303 and tried various other 5H chokes operation is of interest. a right-angle bend so when the two pieces are together they form a photo above: The wire ends were Install the "C" clips on the FINAL TUNING and ANT. Those aren't found on the earlier used for the color. The transmitter chassis was fairly dirty 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. K4HV 160M Collins 20V-3 Transmitter . and 20M, it didn't work on 40M. On the left is the PA and the antenna be snapped into place. worked on my old 32V-2. Collins the PTT, along with other connections to allow the interfacing of the Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. The new choke is much quieter producing a "soft" buzz when the ham band. After the rebuild and with the assembly reinstalled into the toggle switches on front panel, two pilot lamps (green and red) on The two top modulation transformer over time.
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