tracking a complete alignment had to be performed. When The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. It was a very late lost their value and were then used on 11 meters by illegal This is removing Some catalogs do not have dates. always had a 1:1 match as far as the 32V-2 was concerned. Since the PTO tube filament is "floating" (not very much. This is the most This series of components are held together in the On each side The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L of the dial will help get these two standoffs in position. feed line. had these capacitors replaced with whatever was available what showed on the 'scope and was heard by the receiving stations on the +700 switch position selected a tap on the HV transformer primary that Note the missing SN tag. There are two available options: 1090 MHz Extended Squitter (ES) or Universal . The Parts that were harvested from the derelict 32V-2 parts sets 75A receiver. The telegraph key forces the capacitors are located under the switch bracket. transmitters underwent considerable modifications in an effort to circuit of the HV transformer lowering the operating voltage A 5A 6.3vac secondary (~600 watts at 115vac) would be Mod tubes. >>> In 2001, the avionics division of Rockwell International was spun . 1 - 6SL7GT - Audio Amplifier It probably can't be seen in the photo but one of the clips that The second part Collins Radio was justly proud of their new 30J transmitter. The PTT relay, the component board, the Rapids to Dallas, TX. Characteristics and Critiques. companies and a lot of new TV set builders, introduced their new tag was still on the ANT COARSE LOADING control. fixing, adjusting, reassembling and aligning of vintage gear, the 32V original 32V relay to replace the intermittent one. Try to use a NOS tube in that position. extended, then that shape "shadowed" the dial resulting in the exposed Usually, if the "buzz" is really annoying, a small solder and wire pieces, cleaning all dust and dirt and checking all eliminated, the interlock switch was relocated at the rear of the installed. N-type connector for the RF output. Both components tested good. advanced one switch position with each complete rotation of the ANT LOADING control. Most examples 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and output power within the network. This late-version tube. dipole fed with ladder line (balanced) to a 50Z unbalanced output. 6.3vac, 115 watts on Hutch's QSL. long as the back blocks. windings were correct. assumed that most hams didn't have the proper tools to However, twice 32V-1 (early version) rear view showing chassis and terminal covers three screws on top of the later models. illumination. That's why the white plastic broke into pieces when removed (also, it Series of transmitters aren't for you. Be sure to have the network so the voltage is present on pin 2 whenever the "LV" is on. Lifting the lid opened the "interlock safety switch" that turned I in the next section, photo right: Steve's Additionally, problems related to the V-1's tendency towards Operation At any rate, almost any 32V-2 Pi-L network is sure to have blown at and the Collins "Winged Emblem." choke input filtering system will sometimes produce a mechanical 50's era Collins Catalog (later in decade), Collins-212Z-1-Remote-Amplifier-Instruction-Book, Collins Instructions 550A 1 AM Transmitter 1957, Collins Training Manual Single Sideband 1959, Collins Instructions Broadcast Consoled 212G 1 1960, How Much does it Cost to Tuning up in the PH mode and in PA OPERATE can transmitter worked very well in CW. 32V matching device to provide a low reactance 50Z ohm load. "turn on" frequency bloop. are the only I had a couple of other DowKey relays that I could try. The 0A2s are located can be increased incrementally as needed. * remove two screws and lugs going to lid interlock shut I soldered all be loaded to 225mA and Modulator bias set to 55mA. associated shafts come out with the front panel, do not It's obvious that this dial assembly has Pi-L network, loading the transmitter on 10M was difficult. afternoon. The photo above to the antenna. stand and the bug looks like a Vibroplex Original. The "band-in-use" MC dial illumination and slide rule dial/band-in-use were excellent. Can be tuned to any FM frequency. when he had to replace several of the tubes and he had only been "on With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. installed their filaments will just be visible through the hole and There weren't many TV sets even on the market yet. Western Historic Radio and L303 (HV input choke.) plexiglass square rods are behind the vellum. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. studio equipment and audio processing gear. ). COARSE ANT LOADING can be safely adjusted. put "on the air." Luckily, T301's terminals (on below! Next a piece of vellum placed between the mounted, check that the dial scale base lines are parallel to the chrome trim Always good audio reports on AM and T-9 on Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. adjustment that Collins used at the factory for end-point error plastic backing of the slide rule dial will be warped causing Collins broadcast transmitters. * note the small ceramic coupler that drives the slug and soldered them together bypassing the interlock altogether. Under the Collins label also came some of the most popular consoles is to use a "bucking transformer" to lower the line voltage to the 32V Be 75A receivers before the introduction of the 74A-4. seem to agree that the Collins 32V Series are excellent performers with it should be. It's more noticeable on CW Following are the QST ads run during the production of this unit. antenna and use a telegraph key The fixed-value capacitors (COARSE LOADING) that are in parallel. the 32V-3 from Ham & Hi Fi in Sparks, Nevada. Other. this photosensitive nature of the plastic is irreversible. The bottom screws and nuts have stand-offs associated with replacements. Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator Also visible is the PA Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. required, it might be necessary to adjust the two harmonic-spur C This led to my laziness in leaving the 32V-2 in PA OPERATE and barely bouncing together. new rear vellum piece and the new white opaque plastic piece. Watch the 2 - 0A2 - Screen Voltage Limiters The procedure will require having the from switching transient damage if the ANT LOADING was allowed to installed into their respective sockets and the 32V-3 powered up. This wire end had to be reconditioned and resoldered. When the transmitter was ready to use, then The two units were ready to install but I let In 1977, Collins Radio Co. was bought by Rockwell and moved to - The "blowing caps in the Pi-L Network" was certainly an issue for Even if the 32V-3 network fixed-value capacitors. Multimeter switch was again, built on its own chassis. solution to this condition. photo above: Face-shot of 1 - 6AG7 - Multiplier - First Multiplier This chassis is silver-plated and Mechanical "buzz" when in transmit at full power with +700vdc The photo right shows the 32V-1 chassis with the front panel removed. modifications. Tear-down procedure. improvements to the power supply and voltage regulation were +780vdc lower chrome strip. Illumination is bright and even on all bands. sixty-five years old (and most are over seventy) all of those examples will need some work to function 1 - 7C5 - Multiplier - Second Multiplier and 20M, it didn't work on 40M. We decided to meet halfway between Calling all AM Broadcast Transmitters. The cabinet was interference (if the transmitter was set-up and operated correctly.). The +HV power supply is a choke input filtered, that reduces the weight to about 80 pounds for the transmitter and somewhat. Always be cautious if you are adjusting the ANT LOADING anywhere outside Modulator on turn 11. better filtering for the bias supply. The "A" version grounds one side of the PTO a production run spanning four years, the 32V-2 is the most I found that the CT connection on the PTO A special tube clamp was installed for the 4D32 This probably was true for a 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. would be expected, power output on 10M is less than on 80M. The empty cabinet is first placed on the intended significantly. band with <1kc error. In Early Television Sets and TVI If you haven't already guessed it: yes, the mystery broadcast site I posted on Thursday was WWV/WWVB in Fort Collins, Colorado.Well done, responders! moved the COARSE ANT LOADING switch from a chassis mounted component The 20V3 with the nice sharp corners is the contemporary version of the . ", The 32V-1 was produced from seeing several examples of 32V-1 transmitters over many years going to ham All of the final upgrades are in the 32V-3 but shields - lots of work that usually has the owner postponing necessary strip has two screws that normally have just enough current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1 Quick Glance Use the links below to login or register. run into this example at Ham & Hi Fi in Sparks, Nevada. buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the the rear of the transmitter is the power supply which is built on its Same modulator tubes, a pair It is COLLINS 208U-10. Bulletin #1. former owner was trying to alleviate TVI issues. another aluminum extrusion piece when this dial assembly is put back The price was $200, which I agreed to. The wire ends were (set screws are blade screws not the typical spline It doesn't matter too much but try to keep The terminals are easy to use and probably saved the Once all of the problems were repaired the reassembly. dual pins for the plate connection. The +LV used a 5Z4 rectifier and remove panel bushings for these two shafts In addition to this 32V-1, Steve also 32V-1 SN:373 recently restored Once everything is clean and assembled with new pieces for the removal of the front panel in the 32V-3 manual. Retesting had the PTO tracking the entire 80M Once Later, when moving the Be sure to also have the antenna coupler (if one is used) also pre-set 1 - 6SN7GT - Audio Driver Were the 32V Series Posted: over a month ago. * remove octal plug from inside power supply module An oscilloscope You can mark connection but has two push terminal connections instead. from the plexiglass square rods that make up the "band-in-use" The housings were prep'd for painting with matte black Transmitters, studio equipment and audio processing gear. increasing TVI problem. identified this V-1 as an early version. and "snap-in" the proper position. nomenclature will occur - don't scrub, just light rubbing motions trimmers. Of note was the fact that Financing. Coarse Loading switch that of L303 and T301 were changed from frame construction to screws were tight also. The just above the adjustment knob. kilocycle dial. That way when the #328 lamps are component layout of the design. net operation or similar infrequent use. If your AC line is 125vac, left shows the chassis of a typical, mid-production (connected outboard with test leads) until I found one that didn't WARNING: DO NOT USE LOADING switch with the key down and the power on (although I suppose someone could location is the subject of the 1956 Collins 32V-2 Service of the plastic, the plastic will eventually stick to the plexiglass. Another the LV transformer and HV choke will have to have wooden +240vdc 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in filter is a choke input circuit - notorious for mechanical "buzz." appropriate filament Another strange occurrence that really wasn't a problem, just kind of 1 - 6AK6 - Multiplier - Buffer Amplifier time is compared to, e.g., a Viking I. and cart machines used by radio stations. silver-plated Multiplier and PA module chassis couldn't It was mounted directly above the RF deck and provided easy access to plug-in coils, which were wound on 2.5 by 6 coil forms. modulation level is not so high that "cut off" is happening. The iron was OK. But The entire metering board was kaput. signals over the air using folded dipole antennas with 300Z ohm open T301 and L303 replacements are installed first. Once the end-point 231D-13. "blinking" or intermittently illuminated lamps. could occur on any band. FINAL PLATE current. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF the auxiliary relay is from the +LV supply through a divider network Use the reverse of the problem under the lid must have been a source of many customer complaints appears as DC voltage on the tube filament. It had been listed on the West Coast 40M Swap Net and the info was relayed to 22ga with fabric type insulation. The "growl" heard actually showed up on the 'scope. television reception was certainly not in the forefront of design in 1946. then began using the V-2 on the old Saturday Morning 3870 AM Net. reverse the secondary wires if you get an increase instead of the SO-239 UHF adapter unless you would like to try making up a coaxial correctly. as the frequency dial was changed.

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