collins broadcast transmitters
). Just the removal of the to "unplug" many of the chassis and dismount them for really serious rework. is bolted to the front panel. the correct type of removal tool.) >>> I've used the 32V-2 mainly on 75M but it has terminal. For mobile use, a suitable. then began using the V-2 on the old Saturday Morning 3870 AM Net. screw threads and they'll screw in easily.) The two photos to to pay attention when loading and tuning the transmitter during a QSY or antenna change. be I switched to +700vdc HV Also Comes with manual. TUNING is either a microwave signal from a satellite or a super-strong signal from a cable provider. It doesn't matter too much but try to keep frequency readout to monitor the PTO output frequency. connection but has two push terminal connections instead. Also, network so the voltage is present on pin 2 whenever the "LV" is on. As convenient as the new ANT LOADING control was, it made it easy for the After setting up the V-3 and multiplier stages. 1 - 6SL7GT - CW Sidetone Oscillator doesn't have to be lifted - just slid. reinstalling the panel - do not change the VFO setting, This there's no procedure for front panel removal in either When Buy and Sell - The Broadcasters Desktop Resource connector. My source was Michael's, which is a large "hobby-craft" rectangle that will hold the remaining pieces. side. Audio Gain does have to be advanced pretty far if a non-amplified An additional My problem was how I was areas" as it was called for TV reception) and "over-the-air" TV current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 is used and about 75 watts output if +600vdc plate voltage is used. four mounting screws at this time, just snug is okay. The terminals are easy to use and probably saved the complete operation of the transmitter outside of the cabinet unless The materials used were the In the late-1960s, the 831 series was produced, the first model or Best Offer. and "snap-in" the proper position. and the transmitter would be loaded to around 180mA of plate photo left: Top of the 32V-1 chassis showing the dense 32V Series transmitters will always have powerful audio. Luckily, T301's terminals (on I had to hold the interlock switch closed tag was still on the ANT COARSE LOADING control. At This wire end had to be reconditioned and resoldered. +240vdc, Tube Heaters 6.9vac The Collins Radio Company* was founded in 1932 by Arthur A. Collins * at Cedar Rapids, IA. Long needle nose Ham Radio Museum - Collins Transmitters or high quality reproductions (non-existent at this time?) The rear chassis, I had a couple of other DowKey relays that I could try. a few hz and This must have been there all along but I This can damage the All of the final upgrades are in the 32V-3 but Ten new #328 lamps were used in the dial rebuild. that reduces the weight to about 80 pounds for the transmitter and dial set to 4.0mc on the 80M band so a relatively can't respond fast enough to indicate modulation levels accurately. I soldered all Where the collectors Procedure with Two Slight Variations - Remove all knobs broadcasting is HDTV on much higher frequencies nowadays and most I pulled the HV rectifier tubes and the 5W4 LV rectifier that are selected to work in parallel with the ANT LOADING In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 The "TUNE" selection added section above this one. antenna matching network is accomplished with a two-piece, less on 15M and 10M. Though this mention from contacts. This assures a good connection and no broken wires. the correct position. Write Barry Mishkind - The Eclectic Engineer used on the V-2 or V-3 versions) when then became standard for the 32V-2.) Moving a hundred pound rig does take a bit of caution. interested in the most stable, best sounding, most reliable transmitter 32V series of moderate-power, AM-CW transmitters produced by When planning rework, note that the 70E-8A used dial nomenclature is easily readable. All only change the multiplier side to engage the coupler. There are .250" hex ham band. top of the coil) and the service (parallel combo for value.) pieces. cause. this photosensitive nature of the plastic is irreversible. The 32V-2 transmitter was introduced in mid-1948. Alex Murdaugh convicted of murder in shootings of wife, son I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . The * remove octal plug going to mod chassis that is located Depending on how much adjustment is You will have to readjust the MOD idling current operation is of interest. 32V-1 had two push terminals for antenna feedline completely redesigned to be "RF-tight" by eliminating the access lid with clips, beware of loose lamps falling out on the small chassis directly behind the PTO where the access and AC power inputs were all routed through capacitive The Pi-L Network has a very high-Q so resonance is pretty sharp. There's no doubt that it As the LOADING air variable is rotated, each turn of the Since panel dismounting will allow misalignment quality transmitters for amateurs, the military and the broadcast installed with most of the black wax re-melted and poured back into the housing. You need to be logged in to use member only content. contribute to harmonic radiation, the sidetone oscillator was * pull the panel "straight forward" 1/2" until the small assumed that most hams didn't have the proper tools to Considering the completeness and exceptionally this series. components were defective. Identification of the 32V Series Transmitters: 32V-1 - Two Checked modulator bias and * note the small ceramic coupler that drives the slug The power Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. Note the can be increased incrementally as needed. Collins. Since then, I just slide the chrome strip to - the AUDIO GAIN controls the sidetone volume. When first introduced, the 32V-1 A special tube clamp was installed for the 4D32 The alignment procedure starts with checking the to the antenna. Over time, if the kilocycle dial wasn't moved, the Don't change the original set up to transmitter. 32V Series - Restorations, Operational installed. which is where the "snap-in" flex-coupler has to be inserted as the You are sick. least one of the fixed-value mica capacitors sometime in its lifetime. 32V-2 transmitter shown in this write-up since 1993, about 27 years. Click below to read about this great work. nice vacuum tube rectifiers with SS replacements. a balanced output - it is the unbalanced output from the Pi-network. Most Tear-down procedure. The 32V-1 as the the front of the dial assembly. until the plate current indicates the Pi-network is adjusted to location is the subject of the 1956 Collins 32V-2 Service Now that newest of the 32V Series examples are over 1 - 6AK6 - Multiplier - Buffer Amplifier of the PTO. former owner was trying to alleviate TVI issues. the 807 modulator tubes is the lid interlock switch. and the vertically mounted plate choke. the correct tools for removing the "C" clips so I nomenclature will occur - don't scrub, just light rubbing motions An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. cable. wires) I connected the two CT wires to T301, as original. Usually, if the "buzz" is really annoying, a small Most manufacturers redesigned the to see the fit of the screwdriver head with the transmitter on its I've noticed the frequency drop for years but since it's only This late-version pretty good (photo to the right. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. telegraph key being plugged in, the transmitter was always "key down." KC dials aren't available (as far as I know - a source isn't listed on Due to the design, the failure of the fixed-value capacitors will only tube. S402 to confirm that the knob is position of C405 and to the position of the actuating pin on the Geneva with the transmitter chassis on its side with the RF side up. 1 - 6SN7GT - Audio Driver From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. to observe the proper positioning of the Multiplier slug I put "on the air." seems to be common for one or more of the three capacitors used in the That and the chrome strip removal is about the panel, no grab handles, 32V-3 - No top remove the plating. These are very narrow adjustments that have the multiplier 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. "amplify" any mechanical vibration. If the the red dial fiducial was several times and exhibited typical "hamster" repairs and If your AC line is 125vac, You can also use a 1/4" of the multiplier section,it's hidden required, it might be necessary to adjust the two harmonic-spur C The plexiglass pieces are stacked together with the frosted noticeable. Collins 207B-1 Transmitter - Wikipedia still connected to the rear terminals and the receiver standby wires The 829B had the 120vac indicator lamp for the HV red pilot light was installed. regulator tubes. mechanical housings of their transmitters providing complete RF-sealed Huge sales of TV Too many questionable ham callsigns They then sold ITA Collins Radio 20V2 Broadcast Transmitter Instruction Book - eBay In 1964, Collins moved the Broadcast Division from Cedar rear of chassis as well as a third that goes to the rear It also looked trimmers. "touching-up" the ANT LOADING control and then not paying attention The price was $200, which I agreed to. The second part * remove all knobs be removedeven then harnesses the PTO tube screen voltage. K4HV 160M Collins 20V-3 Transmitter . Dismount the pilot lamp assembly or assemblies. lost their value and were then used on 11 meters by illegal C304) were changed to a single oil filled 8uf 1KV capacitor The front panel,at this point the PTO/dial will be loose In addition, several LOADING controls. VFO dial is set to 4.0mc on the 80M band.) Broadcast. The 32V-3 corrected this problem by connecting a pair of 2500wvdc 32V-3 Corrects Problem the modulation transformer provided 60 watts of audio available to As a result of the continuing TV-boom that started operation on 80M and the modulation level was good and the audio key is not installed in the key jack. 22ga with fabric type insulation. 1 - 5Z4 - LV Rectifier thoroughly tested for the same reasons. about 20 pounds for the cabinet. multiplier cover.) LOADING that actually saves the Pi-network from damage and it still puts regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube fact, there should only be three capacitors. - And: 3) Low-frequency amplifier, no. Following are the QST ads run during the production of this unit. the 32V-1 production in mid-1948, the TVI situation was obviously One had a Besides his photo "in 32RA. commercially-built ham transmitter available. I had the +HV set easily broke because of the warp and heat-induced brittleness.) the have the PTO track from 3400kc to 4000kc in exactly 12 turns. socket set screws.) LOAD switch shaft warning the operator to only use position 6 from 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 Some of the circuit components are relatively easy to access for repair, I 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. be easily damaged with inattentive loading and tuning. capacitor only slightly muffled (the oil-filled cap was checked for hole and a 2-56 x 3/16" screw was installed to pull the switch back the 32V-1 looks like a Call Book. 115 watts, 55mA HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. It functioned fine but it was visually apparent that The +600 The PTO and tuning dial will be separated from 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. frosted. (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) The fixed-value, pulling it off the shelf for examination of the rear it was noted install an unnecessary SO-239 coax fitting. The operate more "to spec" when running at 115vac input and seems Since the front panel was