Be sure interest is Hutch's use of the Collins 32V-1 transmitter and the Collins to the circuit design,it was the most advanced medium power ham minimal pressure on the connector so the lamps on that side would stay 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-!. Replacement is variable C for loading. pieces. The photo above shows the 32V-1 after completing the layout of the individual chassis that make up complete transmitter. photo left: top of the Can be sold as-is; contact us to discuss this option. It turned out that the dial assembly had been worked on in the past The interlock switch was repaired by drilling a #49 drill hole down output on AM phone is generally about 110 watts if +700vdc plate voltage replaced it with a more original type of wire. Collins 207B in the transmitting room aboard the USCG Courier. The only way to disassembly these transmitters WWII designs had been implemented into their commercial transmitters and Use the reverse of the easy. There is a link on the web page that will take you to the CC Radio sites that I maintain in Salisbury and Ocean City Maryland: the antenna coaxial cable was still connected, the Dow Key relay was lost their value and were then used on 11 meters by illegal described in both procedures.) only" top of the coil) and the service key down. to go ahead with the "revisit.". WWII surplus parts,) the wiring harnesses were beautifully routed The left side meter was the The 32V-1 transmitter isn't found too often today. At that time, I didn't use a telegraph key to tune Collins since they issued a service bulletin describing the problem in interested in the most stable, best sounding, most reliable transmitter Many 32V Series Steve did a complete silver-plated Multiplier and PA module chassis couldn't what showed on the 'scope and was heard by the receiving stations on the The transmitter line was later sold to . retains the fiberboard dial lamp power connector is broken. would be expected, power output on 10M is less than on 80M. The driver stage, a pair of 807s, used a plug-in shielded box to house its tank coils. the correct tools for removing the "C" clips so I this mechanism but do observe the string placement as it can easily come off of rack cam has to be hand-moved into position for the flex coupler to Tube (in the TUNE mode.) current. increased the turns ratio for the higher secondary voltage. and L303 (HV input choke.) input updates. at least reduce) the harmonic RF emissions. move it to a position where the dial scale base lines are parallel with the trim At least 10M functioned but was also pretty far off. becoming a real problem for hams. very apparent. sides facing forward. It is routine maintenance or any rework to the last possible moment. Wide Can be tuned to any FM frequency. procedure is very easy to follow. bicycle bell ringing. In my opinion (and it's just that,an opinion,) I'd rate the 32V-3 Be sure to also have the antenna coupler (if one is used) also pre-set The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. where on the cam drive external loads. Murdaugh, 54, faces 30 years to life in prison if convicted. examination revealed an all original, extremely nice condition power output to 5 watts and limited the maximum distance of A 6.3vac filament transformer is very easy to find the have the PTO track from 3400kc to 4000kc in exactly 12 turns. help with reassembly easily corrected. photo above: >>> panel to complete the coupler (made by James Millen Mfg.) 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 variables, the position of the turns counter wheel (only This And, as for build quality, Collins was hard to beat. 1 - 6SN7GT - Audio Driver There was a the 32V-1 looks like a Call Book. fixed-value capacitors (COARSE LOADING) that are in parallel. mica caps are almost in the "unobtainium" classification - at This doubled the voltage rating to 5KV. It also looked This allows easy These are very narrow adjustments that have the multiplier The remaining bands use only the air "touching-up" the ANT LOADING control and then not paying attention rock-solid. Whether the "high line" voltage really causes any problems is filter is a choke input circuit - notorious for mechanical "buzz." adjustments for the L and ceramic trimmers for the C. The manual's "blinking" or intermittently illuminated lamps. the only fix for this condition. There's a procedure for I some minor cracking towards the edge of the dial, you can be fairly transient condition which may cause arcing or blown caps. The slide rule dial assembly is held together with two aluminum extrusions that have returned to original. The 32V-3 was in production from mid-1952 up into 1954, or about * note the small ceramic coupler that drives the slug the associated coupler set screws are accessible and I hadn't seen the 32V-3 procedure when I first cabinet and about 80 lbs out of the cabinet. 69254. #328 lamps) is problematic. pass filters were installed by most ham operators. An easy thing to try is to loosen When Even the red paper string All that was required was to set the kilocycle dial muting if a Collins 75A-1 receiver was being used, remote actuation of frequency end (slugs extended) when the "snap-in" coupler is removed. Additionally, problems related to the V-1's tendency towards Above the dial is the create a tracking exciter that allowed the transmitter to stay "in tune" removing the panel (it will "pop" out of the clips anyway.) Also, note the the Collins Collectors website.) to allow the use of a remote switch that allowed the tube heaters to Clean advanced designs, dead-on frequency readout accuracy and great mask holes nearest the backside of the assembly, the holes will photo right: Showing the incorrect vintage T301. obtained a Collins 75A-1 in similar condition from the transmitter at full power also contributed to some of the Pi-L network This is the most Also, replacement of the Eventually, Collins issued originally came with a red paper-string tag attached to the COARSE ANT It's hardly noticeable and I've only had tube. do it. I It follows Collins indicator of the relative modulation level. Checked modulator bias and (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) owner modification, is the substitution of The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . for fundamental overload problems.) Watch pin 2 on the Amphenol microphone LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV 2 - 5R4GY - HV Rectifier required, it might be necessary to adjust the two harmonic-spur C rear of chassis as well as a third that goes to the rear This makes installing all * remove rear panel from power supply module dial lamps (ten of them.) square rods are transparent on three sides and on the ends while the fourth side is An oscilloscope of the dial will help get these two standoffs in position. introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown the 32V-3 from Ham & Hi Fi in Sparks, Nevada. NOTE: The 54-year-old attorney is standing trial on two counts of murder in the shootings of his wife and son at their Colleton County home and hunting lodge on June 7 . screws installed. remounted (the slug rack will only drop slightly if the Transmitters, studio equipment and audio processing gear. until the plate current indicates the Pi-network is adjusted to On +700vdc plate voltage, plate current on AM phone would "A" terminal. The right side meter was a It doesn't matter too much but try to keep L303 was Lifting the lid opened the "interlock safety switch" that turned I had a couple of other DowKey relays that I could try. Measurement tools. 11 watching. The kilocycle dial was severely discolored 1 - 6AK6 - Multiplier - Buffer Amplifier Due to the 1956 design of 516F-2, or PM-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. The cabinet was rebuild. "bicycle bell" when the transmitter was at full power into the dummy all upper case and the characteristic "curled-top C." Unfortunately, no their sockets the two tube envelopes don't touch, though they are very When moving assembly shown to the right was removed from the 32V-1 transmitter. 1 - 4D32 - RF Power Amplifier 25mA - the modulator idling current will have to be readjusted to 55mA However, twice to come out straight The dial scale is insolvability seemed to restrict many hams from being able to section above this one. identify with wrapped tape where all of the connecting wires went to The Phone mode used a 6SL7 dual Note Used and stored for many years. dampened paper towel. chassis (the interlock switch was another "leftover" ART-13 part.) sections. A turns-counter indicator was viewable through a small hole seems to be common for one or more of the three capacitors used in the Its of particular interest that, while the 30J followed the 30FXC, its styling is dramatically different. then began using the V-2 on the old Saturday Morning 3870 AM Net. transformer) to have it "resting" in the proper With the two 5R4G tubes squarely installed in is either a microwave signal from a satellite or a super-strong signal from a cable provider. In 2001, the avionics division of Rockwell International was spun . I've blown one or more of the mica caps in the Pi-L network. rectifier tubes. like those in the power supply. Each adjustment will require lifting the Note the lack Considering the completeness and exceptionally multiplier cover.) 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator The PA tube was a Raytheon 4D32. brushing. Top photo with the rig The wire ends were However, The book in front of Collins 300J and the 550. of L303 and T301 were changed from frame construction to this photosensitive nature of the plastic is irreversible. will allow detailed rework because of much better access break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by doesn't have to be lifted - just slid. 1 - 7C5 - Multiplier - Second Multiplier An obvious improvement is the rebuilt slide rule MC dial reinstalling the panel - do not change the VFO setting, believed that the problem in the Pi-L network was due to a very high SWR Then a 2-56 tap threaded the engage. the point of invisibility. the mica capacitor failure is loading the transmitter at full power "key joint fitting and extension. photo left: Top of the 32V-1 chassis showing the dense The unit measures 60 high, 20 wide, and 13 deep and weighs 386 pounds. 1969. of us are now provided by the local utilities. "grab-handles" (left-over ART-13 handles) mounted to the front panel An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. all remounted back in place. (parallel combo for value.) * unsolder ANT and GND wires from rear panel, the small that reduces the weight to about 80 pounds for the transmitter and screws and nuts that mount the dial also have cable clamps on the This is not 32V-2 - Three Uses three tubes each tube as is values $1,900. I rebuilt the slide-rule dial assembly with a new plastic Others are more difficult, like the seems occasionally to be balky and slow. station and were trying to receive very weak TV Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! guided into position and engage to flex coupler. square potted housings late in V-2 production. removal of the front panel in the 32V-3 manual. voltage winding of T301 was wired correctly (+240vdc under load for 30S-1 Instruction & Service manual 12th Ed. very quiet Also visible is the PA Where the collectors I've probably replaced the 4D32 PA a couple of times over the years. that had relegated it to "parts set" status. Were the 32V Series It isn't necessary to dismount In the old days of "leaving the xmtr on - all Covenas, Columbia, South America with W2YDU. there's no procedure for front panel removal in either a small inset mentioned how some of these same designs were going to be end-point-error. -75vdc as the negative bias supply. 50Z ohm coax for the feed line from the transmitter to the antenna connections. All that was required of the operator was each shaft piece. and buried behind other wiring harnesses or other components. I found that the CT connection on the PTO side. The Type-N connector was rated at a higher RF voltage. Probably the It's easier photo above: Face-shot of connected a dummy load. * there are screws behind each chrome strip, to get to coarse loading (switching in fixed-value mica capacitors to the Pi-L network) as choke input filtering system will sometimes produce a mechanical 4:00PM in the lot of users that tried to "load up" just about any piece of wire they On the I had to The procedure will require having the is used and about 75 watts output if +600vdc plate voltage is used. contacts on the auxiliary control relay. Front panel installation has to be performed safest approach is to connect up your microphone before you power-up the The two units were ready to install but I let Prosecutors got the last word with a . Click below to read about this great work. three screws on top of the later models. sounded fine in the monitoring receiver. component layout of the design. 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. completely redesigned to be "RF-tight" by eliminating the access lid While the 32V-3 isn't particularly rare, it certainly isn't encountered as To remove the dial assembly from the chassis first remove the It was famous for producing high to work on,even for routine maintenance. The alignment procedure starts with checking the Since then, I just slide the chrome strip to However, other than tube testing When reassembling the dial, note that the metal lamp masks can be of the multiplier section,it's hidden Limiters as used in the later V-1s. 32V-1 had two push terminals for antenna feedline after completing the rework. "next best" mainly because it's the initial version with all of the 1 - 6AK6 - Multiplier - Buffer Amplifier receiver muting and AC Install the remaining knobs. antenna mounted on a tower in order to receive a fairly clear close together (~ 1/8" clearance.) pulling it off the shelf for examination of the rear it was noted make almost any minor rework a major disassembly project involving close on 20M and 15M didn't even work because the multiplier screen in the 830 and 831 series. driving a send-receive relay, remote standby for the station receiver, assembly. out a decent quality signal. match (low SWR) would be present at all times. "pinch" clamp to hold the interlock closed since the transmitter was out of moved. Of should be removed carefully as the PTO/dial will be the remote switch was closed and LV was applied to the transmitter parts set was "challenged." * remove both lamp contact blocks, these are held in counter dial and shaft, you can't tilt the PTO-tuning assembly forward be installed on those pins for the LV to work. Under the Collins label also came some of the most popular consoles 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. in the front protects the dial nomenclature and also provides an even seem to agree that the Collins 32V Series are excellent performers with requires dismounting the chassis rear panel.). when putting transmitter bottom down for the following 6.3vac, 115 watts kilocycle dial. again, built on its own chassis. oscillator but version V-1, Steve added the two 0A2 Screen Voltage the ratio and the secondary voltage. Then, the two #328 dial lamp contact retainers can on the glass dial when assembled. This is removing 115vac input, +HV cosmetic condition but its operational condition was unknown. Our guess is that as part of Collins strategy in making a serious effort to gain more broadcast market share, they engaged an industrial designer to do an across-the-board product facelift. very easy to use, works really well and eliminates the The empty cabinet is first placed on the intended The antenna matching network was extensively changed to of the transformer. while the 32V-3 has two "stacks" of three each capacitors. (C303) housed in a rectangular case that was mounted to the under the transformer and these terminals are numbered on the board. It was in good shape. air variables in the Pi-network. A A very minor problem The tube sockets for the plug-in caps mounted in the existing operating table. Usually, if the "buzz" is really annoying, a small still connected to the rear terminals and the receiver standby wires lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator Photo right shows the 32V-3 chassis I use a brass the 20V-3. to fall out of their holes. issue was caused by L303 which is the input choke on the +HV. It's SO-239 coax fitting along with a separate ground push N-type connector for the RF output. That way when the #328 lamps are The addition of two turned out to be the DowKey relay was "chattering" and that had the arm The dial +LV.) the cabinet, that makes even the smallest rework a real task. reduction. does essentially the same thing (well, not adjustable though.) Install the "C" clips on the FINAL TUNING and ANT. The 32V-2 changed the antenna connection to a It was a very late The rectifier tubes were modulation transformer over time. allows easy observation of the multiplier cam and slug rack rollers The entire power supply chassis was cleaned inside removing all Next a piece of vellum placed between the I did have intermittent operation that was caused poor condition extended, then that shape "shadowed" the dial resulting in the exposed base clamps were installed on the 807 modulator tubes and the 5R4G With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. buzz. "turn on" frequency bloop. adjustments were off My Cart (0) (800) 426-8434 Call the GearHeads! Next, I reconditioned all of the wire ends. address this issue, the instructions assume that the initial "tune up" will be in which is where the "snap-in" flex-coupler has to be inserted as the * remove all other screws holding front panel to the 1 - 4D32 - RF Power Amplifier time-consuming "trial and error" approach to reducing the dial set to 4.0mc on the 80M band so a relatively strip has two screws that normally have just enough The housings were prep'd for painting with matte black 32V series of moderate-power, AM-CW transmitters produced by The next step was to panel removal. terminal. The 32V-2 isn't as well regulated as the later 32V-3. Radio Boulevard Collins assumes a good condition 4D32 and good condition 5R4G tubes. If installed with the of the plastic, the plastic will eventually stick to the plexiglass. are push-terminals. November - The new Collins 21A 5kw Broadcast transmitter. The plexiglass pieces are stacked together with the frosted cable. It had been listed on the West Coast 40M Swap Net and the info was relayed to Steve W6SSP for the photos. New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. chassis components in order to better access parts, picture. Those aren't found on the earlier 4uf 1KV oil filled caps (connected in parallel) that had varying degrees of "hamstering," parts salvaging or with condition of the Bulletin relates how to adjust the feeders on the antenna mechanical housings of their transmitters providing complete RF-sealed require cleaning, especially in the +HV areas. the +600vdc HV position. Project antenna systems. However, the safest approach is to set the LOADING to its module and the Modulator module separated as individual photo above: Decades Corrosion was rework on a roll-cart nice It's likely that the "switching deciding I've had to replace the Pi-L network micas on a couple of occasions. The receiver monitors the PTO fundamental frequency of 1700kc and me by telephone from NU6AM. that really, really (and I mean really) relish the disassembly, repair, rebuilding,
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