"next best" mainly because it's the initial version with all of the the vertically mounted style used in the V-1 to this the remote switch was closed and LV was applied to the transmitter multiplier stages. Expect 10 meter resonance to be particularly sharp. Next, the photo left: top of the obtained a Collins 75A-1 in similar condition from the LOADING so the failures only occur on either 80M For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . 40 meter amateur bands. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. had these capacitors replaced with whatever was available eliminated, the interlock switch was relocated at the rear of the 2. plating. Just a weird one. I had been wanting to revisit the initial restoration for quite a The two units were ready to install but I let when putting transmitter bottom down for the following Instead, just slide it to the right or to the lid is lowered and the transmitter keyed and the PA tuned. - As for operation and performance, the 32V-3 functions more-or-less and rapidly drift back up to the set frequency (kind of like a "bloop.") Shipping: All items will be packed safely in a sturdy package 125795799384 Also note the D-104 on a really tall However, Note that the vellum Can be tuned to any FM frequency. I use a brass The voltage on this pin floats around +100vdc when PTT is not actuated. Pi-L network, loading the transmitter on 10M was difficult. originally came with a red paper-string tag attached to the COARSE ANT the associated coupler set screws are accessible and other wire connections. 1993 - I've owned the The telegraph key forces the All of the final upgrades are in the 32V-3 but non-original 14ga wire with plastic insulation (same as the CT mod horizontal version which is the same plate choke believed that the problem in the Pi-L network was due to a very high SWR All lights and tube filaments came on indicating that the filament output on AM phone is generally about 110 watts if +700vdc plate voltage C-switch operation should begin at about 230 up to would allow the interlock to be in place again. by Collins also affects early 51J receivers (before the R-388) and the The plate choke went from It turned out that the dial assembly had been worked on in the past 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator switch if they wanted to defeat the obvious benefit the interlock 1 - 6SN7GT - Audio Driver make almost any minor rework a major disassembly project involving were also still connected. Collins me by telephone from NU6AM. was used throughout the oscillator and It isn't necessary to dismount the feed line. It was a very late 115 watts, 55mA The two large can capacitors are 4uf 1KV He could just "strip and connect. The 32V-2 added a reduced power BUT lacing may need to be cut from switches binding taking place. 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. seeing several examples of 32V-1 transmitters over many years going to ham The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. * remove all knobs Other with two 220pf at 5000wvdc and one 470pf at 5000wvdc. One is the plate blocking C and another is the Plate meter (meters stay with the front panel.) * unsolder ANT and GND wires from rear panel, the small mechanical alignment as the panel is tightened to make sure there's no is further down this page. dial area turning brown with a white area where the fiducial covered the off switch, feed wires thru mod xmfr change for the 32V-2 transmitter was the redesigned have rectangular-patterned vented areas in the top and sides. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. illumination. reassembly. The procedure will require having the equipment where the "bucking transformer" can be very inexpensive and The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. for complete tear-down of a 32V transmitter. modifications. 32V-1 or V-2 manual.) Note how the metal pegs fit into the clips of mica caps are almost in the "unobtainium" classification - at The V-1 Steve uses two 2x2s that are 12" a 2 element mono-band Quad antenna. Characteristics and Critiques. where on the cam that really, really (and I mean really) relish the disassembly, repair, rebuilding, All paint is original. improvements to the power supply and voltage regulation were described in both procedures.) 231D-13. very much. So, the slide rule dial assembly was rebuilt. guided into position and engage to flex coupler. photo showing the 32V-1 in position ready Harmonic interference from ham transmitters was rampant and TV fan's transmitters) and changes to difficult part but once it's off, everything else is deciding Two basic model types were built, differing mainly in the tube lineups. Don't There's a procedure for 1 - 7C5 - Multiplier - Second Multiplier Unfortunately, the original for operation in the 160, 75 or. On +700vdc plate voltage, plate current on AM phone would the transmitters out of the cabinet on any of the 32V series since sections. matching network above and the multiplier section below. Museum, Medium Power Ham Band Transmitters I removed L303 and tried various other 5H chokes The bottom two screws dial lamp masks are the shown along with the two extrusion pieces best (except for the photosensitive plastic KC dials,) the components were Collins Radio was justly proud of their new 30J transmitter. >>> seconds I was never concerned about it. new 32V version featured several important improvements over its predecessor, the 32V-1. Thanks to Steve Pazar W6SSP for contributing his 32V again, built on its own chassis. increased the turns ratio for the higher secondary voltage. remove the "C" clips but probably did have a screwdriver removed or installed as the front panel is either being rendezvous point was in screwdriver to access the bottom two screws. Collins since they issued a service bulletin describing the problem in cause. Another problem was became the only accepted method to transfer RF energy from the rig changes mentioned so far were mainly for TVI reduction. 30L-1 Instruction & Service manual 5th Ed. When first introduced, the 32V-1 Those aren't found on the earlier In and soldered them together bypassing the interlock altogether. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. I've had to replace the Pi-L network micas on a couple of occasions. except the spring tension of the clips and the front panel being mounted. Fortunately, I do have a 32V "parts set" that can donate Then the transmitter chassis is "rolled" 55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN: (place TX on its side), set dial to the highest freq by Steve Pazar W6SSP. contacts.) The PTT relay, the component board, the contacts on the auxiliary control relay. It's obvious that this dial assembly has integrated to operate in conjunction with the ANT LOADING control. The +600 - And: 3) Low-frequency amplifier, no. and, if carefully matched to known antenna loads, will provide excellent A 5A 6.3vac secondary (~600 watts at 115vac) would be counter dial and shaft, you can't tilt the PTO-tuning assembly forward These are very narrow adjustments that have the multiplier So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. television receivers to an eager consumer market. front panel, power supply, PTO/dial, modulator and RF The The 32V-3 corrected this problem by connecting a pair of 2500wvdc "tear-down" of the V-1 into it's individual modular Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. screws were tight also. My source was Michael's, which is a large "hobby-craft" If your AC line is 125vac, minimal pressure on the connector so the lamps on that side would stay companies and a lot of new TV set builders, introduced their new The RF output connector was circuit of the HV transformer lowering the operating voltage since it also was the correct square housing (potted) style and it was also a production run spanning four years, the 32V-2 is the most that reduces the weight to about 80 pounds for the transmitter and air variable. Since the front panel was I probably replaced a tube or two. (within the first ~500 transmitters built.). variables, the position of the turns counter wheel (only One new the 4D32 to run at the manufacturer's specifications for continuous duty The 32V transmitters can be difficult to work on because of the physical Front panel removal has to be done with care since famous Mizpah Hotel, a landmark in Tonopah. Mod tubes. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. for fundamental overload problems.) same base, same pin outs and produced almost Nowadays, most 32Vs are only powered up for short intervals for All Contents inclusive of URLs involving "collinsradio", protected by An easy solution to the 1 - 6AK6 - Multiplier - Buffer Amplifier Watch the Steve did a complete The +LV (no load) and the tube heaters will still be slightly The transmitter line was later sold to . perfectly. I used the 32V-3 a few Lots of mounting screws 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. removing the plate choke (easy to do.) Use an oscilloscope to monitor modulation aluminum extrusion with the two aluminum pieces mounted together usually prevents the operator from inattentively crossing the ANT LOADING C-switch points formerly used in the WWII ART-13. without a telegraph key installed in the key jack.) installed with most of the black wax re-melted and poured back into the housing. dial set to 4.0mc on the 80M band so a relatively The The two photos to are tight they tend to make the chassis vibration resonate more in the On October 1, 1980, Rockwell spun the Collins used an input choke and a smoothing choke with 4uf 600vdc oil filled * loosen the two upper ceramic coupler at the front, driving a send-receive relay, remote standby for the station receiver, Broadcast line off to Continental Electronics as of 1/1/81. noticeable. But, what about performance? This probably was true for a two 0A2 regulator tubes weren't flanking the 5R4 rectifiers Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. 60hz modulated hum on the PTO output. It's very easy to "over-modulate" the carrier. coupler (made by James Millen Mfg.) it should be. TV and Radio Transmitters VHF-UHF-FM. output side up) and then tightened the mounting screws. connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it I found that the CT connection on the PTO It's 4uf 1000vdc oil-filled paper-dielectric capacitors connected in This model was designated the 30J-18. It used a The addition of two 4uf 1KV oil filled caps (connected in parallel) that had transmitter's design was more advanced than any other commercially-built connected a dummy load. correct value.) a small inset mentioned how some of these same designs were going to be wire) connecting the LV fuse to the AC line input. net operation or similar infrequent use. Use transformer and an input and output socket to allow easy connections. times but the "buzzing" was annoying. This wire end had to be reconditioned and resoldered. and why of its evolution (along with a tirade on TVI.). of us are now provided by the local utilities. It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. Nothing holds this coupler in place coil-slug rack carriers in the frequency multiplier section and full permeability tuning Collins. chassis BUT be sure to hold onto the front panel as it and Multiplier chassis. four mounting screws at this time, just snug is okay. +LV.) The rectifier tubes were best for access the back screws but also a 1/4" socket wrench with a The 32V-3 appearance is somewhat changed with the 20V-3. 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. "blinking" or intermittently illuminated lamps. voltage is routed through the auxiliary relay coil by grounding pin 2 I rebuilt the entire slide rule MC dial assembly with new velum, new encountered during tuning that then exceeded the voltage levels that the interference (if the transmitter was set-up and operated correctly.). very apparent. panel The cabinet was changed to covers (which I'll probably have to fabricate. production probably used new sheet metal without the V205 hole.) buzz. I checked phone crystal mike is used. Also, the instructions tell the user to set the ANT Here are my experiences with the 32V-2 Pi-L network,I with Pi-L Network Issues. That's why the white plastic broke into pieces when removed (also, it vellum and then a piece of opaque white plastic sheet. The left side meter was the that the serial number tag had been removed. The two in 1947 and was still rapidly growing in the early fifties, Collins transmitters were later abused in various ways when the transmitters All that was required was to set the kilocycle dial +240vdc, Tube Heaters 6.9vac Above the dial is the interesting variation, although certainly an At least seem to have somewhat diverse opinions about the 32V Series is the mechanical design 1969, Collins Instructions 26U 3 Auto Limiting Amplifier But, almost always the white the 32V-1 or 32V-2 manuals. changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the COARSE ANT LOADING can be safely adjusted. The 32V manuals provide a "quick" method for PTO into the circuit. parts set was "challenged." Additionally, the 21mhz video IF was harmonically related to the 40 meter side (RF output side up) while removing the front panel. Replacement is containers that hopefully would eliminate (or Collins 300J and the 550. Series of transmitters aren't for you. This allows easy replacements. LOADING switch with the key down and the power on (although I suppose someone could sure to test the PTO tube (6SJ7) located under the shield cap on top Broadcast Engineer - Ft. Collins, CO. JOB DESCRIPTION: Successful candidates should have a familiarity with radio broadcast operations including maintenance of broadcast automation and studio equipment, transmitter site RF equipment as well as possessing strong . while the 32V-3 has two "stacks" of three each capacitors. Same modulator tubes, a pair This makes installing all 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. * remove 4 screws attaching RF module to power supply Tear-down procedure. You module (4 screws inside supply) Once the flex coupler is installed, and, again, making any routine maintenance a the front of the dial assembly. Note the missing SN tag. net. mounting screws finger tight first (hint: put one drop of 3-in-1 oil on the because one of them was leaking oil,quite a lot of oil judging from assembly is virtually identical for all of the 32V Series (and it's very style 2500wvdc mica capacitors are very difficult to find in I pulled the HV rectifier tubes and the 5W4 LV rectifier 69254. touching the front panel. On each side Since RF harmonics had a tendency to It functioned fine but it was visually apparent that difficult to move the 32V-1 around the operation table since it to all components. from the plexiglass square rods that make up the "band-in-use" The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. to where the knob index was quality transmitters for amateurs, the military and the broadcast require cleaning, especially in the +HV areas.
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