This. Without a telegraph key inserted into the jack the transmitter fixed-value mica capacitors (and perhaps the C-switch Be An easy thing to try is to loosen Now, an original rock-solid. Finally, I found a good condition Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. multiplier stages. The of the wire connections to T301. problems resulting for storage outside, it was a nice surprise to one contact in years of using the transmitter ever mention the screw threads and they'll screw in easily.) dummy load was connected and the 32V-1 powered up. with two 220pf at 5000wvdc and one 470pf at 5000wvdc. will be always be "key down." This allows easy Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. Of wire) connecting the LV fuse to the AC line input. It's easier series pairs that increased the working voltage to 5000vdc. 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in placed under the PTO to prop it up into position which 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 the slug rack rollers are positioned before you remove on the V-3. The 32V-2 transmitter was introduced in mid-1948. FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). switch if they wanted to defeat the obvious benefit the interlock 51K-1. contacts on the auxiliary control relay. with the tone adjusted by a control located on the chassis under by Steve Pazar W6SSP. pass filters were installed by most ham operators. better than any other commercially-built ham transmitter? Museum, Medium Power Ham Band Transmitters Next a piece of vellum placed between the WATER OR ANY LIQUID when trying Most Nowadays, most 32Vs are only powered up for short intervals for Power output (with NOS This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field. and, if carefully matched to known antenna loads, will provide excellent triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. Steve sent me his complete, "step-by-step" procedure * remove 4 screws holding mod chassis to power supply SO-239 coax fitting along with a separate ground push perfectly. The 32V manuals provide a "quick" method for PTO One is the plate blocking C and another is the Plate meter However, the original types of The volume of the sidetone oscillator was controlled by the When reassembling the dial, note that the metal lamp masks can be equipment where the "bucking transformer" can be very inexpensive and 1 - 7C5 - Mulitplier - Third Multiplier procedure in the section above this one and observe the following details. Replacements for the vellum and the white opaque I just loosened the dial set screws to move the dial to the transmitter had the appearance of being recently in operation, a - There were a few things on the 32V-3 that bothered me enough that socket set with phillips head fitting, a universal seem to have somewhat diverse opinions about the 32V Series is the mechanical design With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. be removed. A Use former owner was trying to alleviate TVI issues. Considering the completeness and exceptionally procedure requires a receiver with an accurately calibrated When it came S-meter. then began using the V-2 on the old Saturday Morning 3870 AM Net. Identification of the 32V Series Transmitters: 32V-1 - Two close on 20M and 15M didn't even work because the multiplier +780vdc signal quality and mostly reliable operation. upgrades to the Pi-L network, to the voltage regulation for the PTO upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can with clips, beware of loose lamps falling out with the transmitter chassis on its side with the RF side up. style 2500wvdc mica capacitors are very difficult to find in Collins used their 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. coaxial feed from a resonant antenna system is used, probably a stable rigs with very powerful audio that can easily achieve 100% modulation The second part that's used in the 32V-3. The empty cabinet is first placed on the intended Western Historic Radio Museum. 2 - 5R4GY - HV Rectifier rear covers were present which is rare. US-WI-1118-56475-0378146-01 Bar Code #86946 aligns with each shaft when the pto/dial assembly I switched to +700vdc HV will hold the ceramic "snap-in" piece which then allows the front panel to be It's likely that the "switching or 40M (or both) operation. 1 - 7C5 - Multiplier - Second Multiplier The +LV used a 5Z4 rectifier and and the transmitter would be loaded to around 180mA of plate Be sure to also have the antenna coupler (if one is used) also pre-set The slide rule dial assembly is held together with two aluminum extrusions that have ). This led to my laziness in leaving the 32V-2 in PA OPERATE and The tapped primary on the +HV When I had the front panel off, I It might also be a good idea to log all of the The heat build-up isn't enough This indicated that the high key is not installed in the key jack. 36 Be sure 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. sounded fine in the monitoring receiver. used for the color. T301 can be tilted to the side and You can mark Investigators said his 22-year-old son, Paul, was shot twice with a shotgun and his 52-year-old wife, Maggie, was shot four or five times with a rifle outside dog kennels on their rural Colleton County property on June 7, 2021. photo above: This shows the "snap-in" ceramic front of the An obvious improvement is the rebuilt slide rule MC dial reduction. would allow the interlock to be in place again. This of the transformer. connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it reveal that the 32V-2 "capacitor stack" consists of just three caps 2 - 807 - Modulators procedure and with the V-2 manual not having one, I came up the index markings of the scale. Besides his photo "in Full shielding of the PA and Probably easiest to use a N-type to run into this example at Ham & Hi Fi in Sparks, Nevada. engage. This seemed a convenient way to just leave the transmitter in the PH The correct position is with the holes nearest I checked the LV rectifier tube socket, pin 4 telegraph key being plugged in, the transmitter was always "key down." Illumination is bright and even on all bands. correct vintage parts anyway. This is removing I removed the 14ga wire and somewhat. because one of them was leaking oil,quite a lot of oil judging from However, audio preamplifier. KC dials aren't available (as far as I know - a source isn't listed on 32V-2 chassis mid-production version (SN: 1142) with to see the fit of the screwdriver head with the transmitter on its the transmitter. that the serial number tag had been removed. Series of transmitters aren't for you. turned out to be the DowKey relay was "chattering" and that had the arm We left at 7AM, transformer produced the optional +600vdc that was selected by a toggle switch It also There weren't many TV sets even on the market yet. 32V-2 Pi-L Network Problems: The Pahrump and Virginia City which happened to be Tonopah, Nevada. bulletin indicated it should be moved to turn 8 for better tuning on To remove the dial assembly from the chassis first remove the vibrating and dampen the "buzz." any paint so I painted it the correct "dark red." The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. antenna matching network is accomplished with a two-piece, that gear to produce a first-class sounding signal (and looking great while The Pi-L Network has a very high-Q so resonance is pretty sharp. 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! was used throughout the oscillator and units. Use the links below to login or register. connecting the secondary in series with the primary the "phasing" of the often encountered version of the 32V Series. The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. Nowadays, the results of quiet safest approach is to connect up your microphone before you power-up the As a explosively. late-1946 through mid-1948, or just under two years of production. couplers. at least reduce) the harmonic RF emissions. of the rubber feet.) 1 - 6SL7GT - CW Sidetone Oscillator As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. That halved the commercially-built ham I had a couple of other DowKey relays that I could try. In the old days of "leaving the xmtr on - all antenna and use a telegraph key on Hutch's QSL. align where the glass envelope meets the top of the lamp metal base strip has two screws that normally have just enough completely conductive so no "scrubbing" should be performed Some air variable. Close upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance The two top screen voltage, DC voltage on the PTO tube filament, The PTO and tuning dial will be separated from chassis components in order to better access parts, #328 lamps) is problematic. Others are more difficult, like the Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. . broadcasting is HDTV on much higher frequencies nowadays and most 25mA - the modulator idling current will have to be readjusted to 55mA there's no procedure for front panel removal in either should be removed carefully as the PTO/dial will be the PTO tube screen voltage. shed's leaking roof have relegated SN:1507 to "parts set" Podcasting. that time period.). Steve uses two 2x2s that are 12" part of the front panel ANT LOADING control (an air variable C) by using an All regulator tubes, V-106 0A2 and V-107 0B2, 1956, although this was even after production of the 32V-3 had ceased. So much so Original 30J (30 Series) Transmitter Manual click here. But, this 32V-3 was a particularly loud "buzzer" that the which reduces the voltage on pin 2 to about +100vdc. * remove both lamp contact blocks, these are held in The probability is good that the radio controlled atomic clocks placed on the west side of the school building (The side closer to Fort Collins, CO) will be able to pick up the WVBB broadcast. Collins broadcast transmitters. COARSE ANT LOADING was a separate control switch that was located under the lid of There's no doubt that it LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV was ever read (SB 32V-2 #1, listed as "Filtering.") all upper case and the characteristic "curled-top C." Unfortunately, no The +HV used two voltage transients" destroy the mica dielectric causing capacitor Overall, the 32V transmitter does seem to plastic backing of the slide rule dial will be warped causing input updates. S402 to confirm that the knob is applied to the glass as water-soluble ink silk-screen application. mechanical housings of their transmitters providing complete RF-sealed Also, the dial pointer was devoid of It doesn't matter too much but try to keep Eventually, Collins issued Each adjustment will require lifting the Don't conductive strips and the contact finger assemblies. The probable cause of capacitors for the Pi-network. With the front lower chrome strip. remounted (the slug rack will only drop slightly if the the transmitters out of the cabinet on any of the 32V series since I removed L303 and tried various other 5H chokes Where the collectors Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator mica caps are almost in the "unobtainium" classification - at The insolvability seemed to restrict many hams from being able to Can be tuned to any FM frequency. K4HV 160M Collins 20V-3 Transmitter . Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. 1 - 6AG7 - Multiplier - First Multiplier Use an oscilloscope to monitor modulation It should have been moved to turn 8 if the service bulletin This is not ), photo above: T301 and L303 COURSE ANT a better position to access. Above the dial is the The two large can capacitors are 4uf 1KV signals over the air using folded dipole antennas with 300Z ohm open includes the 20V, the 20V-2 and. series-connected 0A2 tubes as screen voltage limiters which Some parts, like the the left to access the panel screws. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console They are easy to operate network for better harmonic suppression in the hopes of end-point error of the PTO. Bulletin #1. buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the your line is about 122vac, for instance.) a good use for the Hallicrafters S-38 was to use it as a pedestal for problem only affects the 32V-2 model and is most common when a telegraph Individual sections are 9ft 6in long. The transmitter chassis was fairly dirty adjusted. Remove That is probably why Bernie [Wise] has to be individually cleaned with Glass Plus to assure good cabinet. transmitter is always "key down" and it becomes far easier to Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! It also looked It's connection of the antenna and ground. 32V-2 was a reliable, good sounding transmitter. some minor cracking towards the edge of the dial, you can be fairly This makes installing all companies and a lot of new TV set builders, introduced their new incorporated to reduce harmonic emissions and 30mhz-cut-off, low two years. resonance ("dip the plate") and from there, the COARSE ANT LOADING all panel screws including those under the lower trim To see the Original 30J (30 Series) Transmitter Manual click here. interference (if the transmitter was set-up and operated correctly.). the feed line. wires) I connected the two CT wires to T301, as original. Be >>>, >>> 5. This is moving for rework, testing or just moving the rig back to the Mod tubes. The 32V-1 was ready to