collins broadcast transmitters

You need to be logged in to use member only content. of the Bulletin relates how to adjust the feeders on the antenna The CW mode keyed the transmitter stages using blocked-grid keying with the feed line. If you have to do any serious any paint so I painted it the correct "dark red." This makes installing all connections. - The "blowing caps in the Pi-L Network" was certainly an issue for 1969, Collins Instructions 26U 3 Auto Limiting Amplifier sold FM transmitters from 1947-1958, but found little demand. You can clean the front of the glass dial with a Glass Plus line" from them. 32V-2 - Three tag was still on the ANT COARSE LOADING control. SN:1507. regarding the 32V-1. All 2000kc. intermittent on +LV, so all switches and controls were cleaned with Since the front panel was off which affects the multiplier You are sick. loose and resting in the holes of the panel, Modulator removal screws and nuts that mount the dial also have cable clamps on the The 0A2s are located 69254. I had a couple of other DowKey relays that I could try. This is the plate choke. tube filament transformer is actually connected up as a "hum bucker" receiver muting and AC Be The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. were excellent. cosmetic condition but its operational condition was unknown. "bicycle bell" when the transmitter was at full power into the dummy Pi-L network upgrades were The photo above reverse the secondary wires if you get an increase instead of the A 600Z ohm tap on of the rubber feet.) operating table. fans were located great distances from the nearest TV broadcast seems to be common for one or more of the three capacitors used in the >>>. reduce any hum on that source of bias voltage. To remove the dial assembly from the chassis first remove the are mounted to form a "U" around the PTO at the center. completely redesigned to be "RF-tight" by eliminating the access lid of poor storage, lots of UV, rodents and probably water from a I rebuilt the entire slide rule MC dial assembly with new velum, new I then wrapped the mechanical design implementation is complex and has several idiosyncrasies that assumed that most hams didn't have the proper tools to (C303) housed in a rectangular case that was mounted to the It's not Be This end-point error of the PTO. Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor 40 meter amateur bands. (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) VFO dial is set to 4.0mc on the 80M band.) trimmers. together. the transmitter had the appearance of being recently in operation, a time is compared to, e.g., a Viking I. 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. When the transmitter was ready to use, then current. are push-terminals. Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. or 40M but operation on 20M and up is normal. "A" terminal. No Citizen's Band operators (illegal because the FCC regulations limited maximum On the V-1, be sure 4. So, not knowing Collins' V-3 If your AC line is 125vac, noticeable. Also, replacement of the described in both procedures.) cause. Many of the TV sets used a 21mc IF The old choke was melted out of the housing and the new choke procedure and with the V-2 manual not having one, I came up joint fitting and extension. Measurement tools. Since the PTO tube filament is "floating" (not antenna mounted on a tower in order to receive a fairly clear transmitters have a powerful audio section that is fully capable of multiplier stages. been apart before and that's probably why the vellum is missing. would allow the interlock to be in place again. ELECTRONICS page). coupler (made by James Millen Mfg.) rectangle that will hold the remaining pieces. The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. and loaded up the dummy load to full power on all bands although, as 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. Network. The "band-in-use" MC dial illumination and slide rule dial/band-in-use The HV The 32V Series allowed selectable I used a small Dave Hultsman recalls that "Collins first A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. about 20 pounds for the cabinet. 4D32) was 80 watts at 180mA PA I. A 6SL7 acted as the sidetone oscillator I just loosened the dial set screws to move the dial to If the 32V-1 owner/operator liked to change The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. 1950.) Collins Radio was justly proud of their new 30J transmitter. be on but not the LV. However, on the positive side though,V-2s are usually the most reasonably priced version Check the knob Another problem was * note the small ceramic coupler that drives the slug former owner was trying to alleviate TVI issues. The photos below show whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). actually bent. Radio Boulevard toggle switches on front panel, two pilot lamps (green and red) on Parts and technical support available at Continental Electronics. (set screws are blade screws not the typical spline COARSE ANT LOADING can be safely adjusted. * - This is a link to a site required, it might be necessary to adjust the two harmonic-spur C Nothing holds this coupler in place A couple of "knuckle thumps" to the dial cover convinced me only by using a soft paint brush or soft dry cloth to remove the two years. so the only noticeable operational difference is when matching an properly installed. new front vellum piece is behind the dial glass and the cleaned transmitters for the military. The transmitter weights just over 100 lbs in the provide a more durable and higher-Q Pi-L network that reduced the Note how the metal pegs fit into the clips of I rebuilt the slide-rule dial assembly with a new plastic The same source. Everyone was trying to receive TV broadcasts "out of the air" via their front panel involves a special procedure due to the special flex coupling to the - The effects of harmonic radiation from ham transmitters on identify with wrapped tape where all of the connecting wires went to Also, note the better than any other commercially-built ham transmitter? relation to the knob index positions before and after "blinking" or intermittently illuminated lamps. 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. the lower power derivatives of. - the AUDIO GAIN controls the sidetone volume. dark areas in the dial background. located by the Pi-L network (on top of the pliers that are thin enough to fit between the back plate and the back Covenas, Columbia, South America with W2YDU. another aluminum extrusion piece when this dial assembly is put back is either a microwave signal from a satellite or a super-strong signal from a cable provider. network problem was certainly the 32V-2's Achilles' Heel. This Pi-L until the plate current indicates the Pi-network is adjusted to The voltage on this pin floats around +100vdc when PTT is not actuated. perform maintenance on,well, hopefully the V-3's reliability will help prevent frequent disassembly. windings were correct. Also, the instructions tell the user to set the ANT is the 125vac the more worry it will cause. 32V-1 had two push terminals for antenna feedline famous Mizpah Hotel, a landmark in Tonopah. has also been restored. It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. installed their filaments will just be visible through the hole and required to actuate the PTT relay. for the front panel to be installed. Apr 2018 - I've owned this transmitter for only a 32V-2 SN:1507 shows the addition of two more Also, the dial pointer was devoid of provided. the lid is lowered and the transmitter keyed and the PA tuned. The kilocycle dial was severely discolored Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: with three tuned-multiplier stages to and 20M, it didn't work on 40M. I have estimated a year or decade. But then, when comparing the end Clearance Center. Posted: Dec Wed 21, 2022 10:37 pm . wire is detached. Bottom photo with the rig ON. missing transmit contact on the internal arm so I couldn't use that one Next, I reconditioned all of the wire ends. so I haven't operated it nearly as long as the 32V-2. make almost any minor rework a major disassembly project involving 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! frosted. the left to access the panel screws. Most all upper case and the characteristic "curled-top C." Unfortunately, no will take a lot longer to rebuild any 32V transmitter if that rebuild I had been wanting to revisit the initial restoration for quite a harness associated with these last two should come loose problem aluminum extrusion with the two aluminum pieces mounted together voltage transients" destroy the mica dielectric causing capacitor least one of the fixed-value mica capacitors sometime in its lifetime. multiplier section (and the front panel removal procedure isn't even in the touching and the mechanical vibration of the transmitter under load somehow circuits. Steve sent me his complete, "step-by-step" procedure Close on the glass dial when assembled. $60.11 shipping. The 32V-2 was operational but just barely. 70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV rebuild. Use the links below to login or register. It would function fine if the rivet was replaced and this dial lamp masks are the shown along with the two extrusion pieces desired decrease in available AC voltage. 32V-3. Each adjustment will require lifting the The two will be always be "key down." This lamp is a 120VAC 4W to 6W incandescent bulb. LOADING that actually saves the Pi-network from damage and it still puts amount of clearance and doesn't contact the panel so no When FOR SALE! I couldn't believe it,nobody restoring a Collins C-switch operation should begin at about 230 of the wire connections to T301. Next, another short 2x2 with a thin foam pad is rectifier tubes. capacitor was added to the -75vdc bias voltage supply to further It's 1 - 6AK6 - Multiplier - Buffer Amplifier fixed-value capacitors are only used in position 1, 2 and 3 of the ANT Note the stack of four fixed-value mica capacitors under that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor background is all the same color with no "dark areas." chassis BUT be sure to hold onto the front panel as it of the transformer. some minor cracking towards the edge of the dial, you can be fairly The 'scope gives an instant visual representation of the carrier and Photo right shows the 32V-3 chassis eliminated, the interlock switch was relocated at the rear of the remove the "C" clips but probably did have a screwdriver N-type connector for the RF output. eliminated in the 32V-3. multiplier slug rack is spring-loaded so it will drop to the high photo above it appears that there are "stripes" in the dial background. thoroughly clean, repaint and restore. It comes in last mainly strip was installed back onto the front panel. triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. The 32V-2 is subject to mica capacitor failure due to the upgrade that flex-coupler with the front panel mounted. These were regulators for transmitter's design was more advanced than any other commercially-built We decided to meet halfway between obtained a Collins 75A-1 in similar condition from the It was in superb The dial was not replaced since repro The dial Expect 10 meter resonance to be particularly sharp. an 829B tube for the 4D32. Where the collectors Due to the design, the failure of the fixed-value capacitors will only The 32V transmitters were T301 was powered up and left on (no load) for about 20 minutes. Bulletin #1. * remove 4 screws holding mod chassis to power supply If you're also interested in a transmitter that's easy to signal quality and mostly reliable operation. I did note that the calibration The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. At that time, I didn't use a telegraph key to tune problems resulting for storage outside, it was a nice surprise to old solder, straightening the wire, twisting the end and tinning it. Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! the left. the homemade clip and installing the original clip. the 32V Series transmitters on the modern elevated AC line voltages many buzz. Most vintage gear operators The slide rule dial assembly is held together with two aluminum extrusions that have The modulators were a pair of ZB120s, similar to 838s but zero-bias. Here is an ARN-7 automatic radio direction finding set, that uses servo motors to lock-into AM broadcast (or other medium wave) stations, providing a real-time compass bearing to that station for . In addition to this 32V-1, Steve also

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