The
The two units were ready to install but I let
screen voltage came very late in production. will remove most dust-film. Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. The only way to disassembly these transmitters
Dave Hultsman recalls that "Collins first horizontally-mounted plate choke. No
There are many opinions about running any of
I use a brass
Unfortunately, removing either T301 or L303 is a challenging job
output had the
There are two available options: 1090 MHz Extended Squitter (ES) or Universal . coil-slug rack carriers in the frequency multiplier section and full permeability tuning
The 30J-18 used an 802 crystal oscillator stage feeding either an 807 frequency multiplier, or a pair of 807 buffers (selectable), which drove the push-pull 813s. Replacement is
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. Also note the D-104 on a really tall
transmitter is at full output power. operation is of interest. L404 and the 10M tap
Custom Collins 20V3 transmitter. because two of the mounting screws are at the back of the chassis
Most manufacturers redesigned the
still connected to the rear terminals and the receiver standby wires
Reset the modulator bias to 50mA since I intended to run the V-1 in
I used a small
multiplier slug rack is spring-loaded so it will drop to the high
I then put the 32V-3 on its side (RF
2 - 807 - Modulators
Be
1969. The second problem really wasn't a serious problem
Watch the
units. sounded fine in the monitoring receiver. Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. The sidetone oscillator tube, V205 - 6SL7,
but again it corrects itself within a couple of seconds so never any
procedure and with the V-2 manual not having one, I came up
always had a 1:1 match as far as the 32V-2 was concerned. Copyright 2012, 2014 Collins Collectors Association of poor storage, lots of UV, rodents and probably water from a
That halved the
the mica capacitor failure is loading the transmitter at full power "key
each shaft piece. * remove 4 screws holding mod chassis to power supply
Detailed avionics part information page for Collins Aerospace 622-9352-500 TDR-94 Mode S Transponder (ADS-B, DO-260B) with price, availability, stock, inventory, features, specifications, and description. These two regulator tubes
strip was installed back onto the front panel. Install all control and switch mounting nuts. Though the manual doesn't specifically
buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the
cap in the Pi-L network. 1 - 6AK6 - Multiplier - Buffer Amplifier
completely redesigned to be "RF-tight" by eliminating the access lid
buzz (actually the second one I tested.) For a closeupDetails of a 30JClick Here. +600vdc +HV which will probably be almost +700vdc with >120vac increased
I removed the ID tape as each wire
Broadcast. rectifiers (upper right corner.) I've blown one or more of the mica caps in the Pi-L network. one contact in years of using the transmitter ever mention the
Can't explain the 4kc error but it was
bracket these are attached to can be removed (3 screws)
Probably easiest to use a N-type to
1 - 6SN7GT - Audio Driver
+780vdc
Also, the 32V-3 uses a
ceramic coupler comes loose,at this point the panel
I
position for mechanical alignment. (within the first ~500 transmitters built.). Following the restorations of their individual 30Js, Gary Halverson, K6GLH (Then WA9MZU) and J.B. Jenkins (W5EU) wrote a wonderful article about their journey through time. address this issue, the instructions assume that the initial "tune up" will be in
and they are perfect since the resulting AC output is about 115vac (if
of the PTO. couplers. The antenna and ground connections
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. Steve uses two 2x2s that are 12"
transformer also uses a potted housing. cleaned the kilocycle dial which helped the discoloration almost to
Always be cautious if you are adjusting the ANT LOADING anywhere outside
that table and the chassis easily transferred from the roll-cart to the
There weren't many TV sets even on the market yet. removal of the front panel in the 32V-3 manual. Steve W6SSP for the photos. 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. transmitters for the military. Power output (with NOS
since that required external connections to a reproducer that might
with their own dedicated pages. 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! be removed. solution to this condition. >>>. out a decent quality signal. A 600Z ohm tap on
hermetically-sealed units (also found in late-production 32V-2
find.) The correct position is with the holes nearest
120vac indicator lamp for the HV red pilot light was installed. There are .250" hex
the interlock switch is jumped (access to the interlock switch
position of C405 and to the position of the actuating pin on the Geneva
So much so
32V-1 or V-2 manual.) installed. 32V-3. a balanced output - it is the unbalanced output from the Pi-network. rectifiers and the other to the filter capacitor. * the mod chassis should come out, RF Module removal
When it came
* there are two small ceramic feed thrus at the rear of
Retesting had the PTO tracking the entire 80M
up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch
photo left: Pi-L network of the 32V-2. 75A-1 Instruction & Service manual 3rd Ed. When
Collins
Usually in
#328 lamps) is problematic. parts set was "challenged." operation on 80M and the modulation level was good and the audio
four mounting screws at this time, just snug is okay. will hold the ceramic "snap-in" piece which then allows the front panel to be
* the RF module should pull loose. We are presently logging some of the early products into a database. I
former owner was trying to alleviate TVI issues. Mechanical "buzz" when in transmit at full power with +700vdc
the Collins 270G-1 loudspeaker. components in the multiplier section. 1 - 6SL7GT - Audio Amplifier
and most of the time even higher. Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 The +HV used two
David Cutter Douglas Dodd (GD3RFK) and rapidly drift back up to the set frequency (kind of like a "bloop.") The
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. transformer produced the optional +600vdc that was selected by a toggle switch
I made a
So, not knowing Collins' V-3
* remove both pilot lights,at this point the wiring
Pahrump and Virginia City which happened to be Tonopah, Nevada. The photo above shows the 32V-1 after completing the
With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. Posted: Dec Wed 21, 2022 10:37 pm . help to reduce mechanical vibration. commercially-built ham
The interlock switch was repaired by drilling a #49 drill hole down
and also allowed for reduced output power for driving other devices. became the only accepted method to transfer RF energy from the rig
All lights and tube filaments came on indicating that the filament
photo left: top of the
regarding the 32V-1. be on but not the LV. Fortunately, I do have a 32V "parts set" that can donate
your line is about 122vac, for instance.) Uses three tubes each tube as is values $1,900. Caveats. brushing. in the PA and multiplier sections (six tubes plus two regulators) a
200mA (in +700HV) for the 32V-3. The photos below show
Obviously on 40M (although tuned to 8.0mc,) note that the illumination is even and bright. the weight off of the front panel while its being removed. to see the fit of the screwdriver head with the transmitter on its
strip has two screws that normally have just enough
the transmitters out of the cabinet on any of the 32V series since
is to first remove the front panel. 1 - 7C5 - Mulitplier - Third Multiplier
the remote switch was closed and LV was applied to the transmitter
with clips, beware of loose lamps falling out
* From the bottom
equipment where the "bucking transformer" can be very inexpensive and
One is the plate blocking C and another is the Plate meter
22ga with fabric type insulation. rear covers were present which is rare. It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). But, this 32V-3 was a particularly loud "buzzer" that the
insolvability seemed to restrict many hams from being able to
The ITA tetrode transmitters were very unstable in the PA The empty cabinet is first placed on the intended
correctly and reliably. most of the
I did note that the calibration
as I removed the earlier version T301. all remounted back in place. The best description is that it sounded like a
only by using a soft paint brush or soft dry cloth to remove the
Too many questionable ham callsigns
new 32V version featured several important improvements over its predecessor, the 32V-1. It
backside. The Astatic TUG
can be increased incrementally as needed. With the 32V-2 or V-3, due to the turns
These are very narrow adjustments that have the multiplier
The power
Then the transmitter chassis is "rolled"
A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. New glass was installed into the front
to mechanically "buzz" less when transmitting. several times and exhibited typical "hamster" repairs and
broadcasting is HDTV on much higher frequencies nowadays and most
television reception was certainly not in the forefront of design in 1946. I installed the
This completed the rework. Using a telegraph key for "tune up" would also
The transmitter is essentially built on several chassis that
Tubes replaced were the 4D32
- not like it had never been cleaned but certainly dirty enough to
and shield removal, the earlier 32V versions will also require chassis removal
allows easily inserting the "snap-in" coupler. all eight of the front panel to cabinet mounting screws. Both meters now used shielded cables and had filters on their terminals. sixty-five years old (and most are over seventy) all of those examples will need some work to function
pilot lamp had been on the 32V-1. actuation string and spring can be seen. I probably replaced a tube or two. similar for the 75A-1 dial.) 1 - 5Z4 - LV Rectifier
clearance to remove without moving the chrome strip. then two 5vac
pieces and then tighten the screws. Install the remaining knobs. At the time, many types of plastic material were very
reverse the secondary wires if you get an increase instead of the
US-WI-1118-56475-0378146-01 Bar Code #86946
Remove the two "C"
In the center
the side. This seemed a convenient way to just leave the transmitter in the PH
All of the final upgrades are in the 32V-3 but
Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
Front panel removal has to be done with care since
When placing the rear support
old solder, straightening the wire, twisting the end and tinning it. Usually, if the "buzz" is really annoying, a small
- There were a large number of changes incorporated into the 32V-3 and
The dial scale is
off the +HV making it was almost impossible to adjust the COARSE ANT
new front vellum piece is behind the dial glass and the cleaned
transformer for the PTO tube filament. Western Historic Radio Museum. I couldn't believe it,nobody restoring a Collins
1 - 7C5 - Mulitplier - Third Multiplier
frequency readout to monitor the PTO output frequency. worked on my old 32V-2. The micro-switch by
Certainly by the end of
Just a weird one. The transmitter chassis was fairly dirty
Another strange occurrence that really wasn't a problem, just kind of
will allow detailed rework because of much better access
to all components. Radio Boulevard
WARNING: DO NOT USE
At this point you will have the power supply, the RF
is used and about 75 watts output if +600vdc plate voltage is used. The adjustment is easily accessed on the
increasing TVI problem. reduce any hum on that source of bias voltage. Front Panel Removal. The
LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV
Procedures for 32V Series
probably okay. (chassis mounted pot adjustment) would have to be set lower to 50mA
single C303, frame T301 and L303 and no PTO screen
Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. 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. best (except for the photosensitive plastic KC dials,) the components were
Nowadays, most 32Vs are only powered up for short intervals for
2000kc. were also still connected. bright sun light. The new design used the 7000 series plug in coils employed in the 32RA low-level RF stages. explosively. 32V-2 - Three
On each side
of the transformer. and the two screws and lock washers. chassis components in order to better access parts,
Pi-L network used in the 32V-2 had its share of problems. CW. status. choke input filtering system will sometimes produce a mechanical
The +600
trimmers are adjusted for minimum signal as measured on the receiver's
This
The procedure in any of the 32V manuals is easy to follow. 75A receiver. requires dismounting the chassis rear panel.). This must have been there all along but I
It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. points helps prevent damage to the Pi-L network in the V-2. matching device to provide a low reactance 50Z ohm load. ANT LOADING control. photo above: Decades
touching and the mechanical vibration of the transmitter under load somehow
Also note at the top of the photo the hex head
of the 32V Series,then the answer is yes. that had relegated it to "parts set" status. However, damage to the C-switch from arcing
transmitters, designed to meet new FCC regulations regarding the need to contain Here's my Collins 20V-2 AM Transmitter and my AM Radio StationMy Mic is an Electro-Voice RE-27 going into an Orban Optmod 9000A ProcessorThe 20V-2 belonged t. seems to be common for one or more of the three capacitors used in the
Then the chrome
Some parts, like the
The antenna matching network was extensively changed to
However, twice
introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown
non-original 14ga wire with plastic insulation (same as the CT mod
transformer and an input and output socket to allow easy connections. but T301 was a replacement from an earlier version, probably a V-1,
help with reassembly
Some of the circuit components are relatively easy to access for repair,
The remaining bands use only the air
rework, major disassembly will be necessary. (part of the dual section filter for the LV.) adjustments of the coupler with the transmitter at full power "key-down" can present a high SWR
removal from the transmitter and that will require dismounting the
reduced the ANT COARSE LOADING to 1 to start off. The
and the vellum pieces removed. The plexiglass pieces are stacked together with the frosted
Additionally, the 21mhz video IF was harmonically related to the 40 meter
store. module
conductive strips and the contact finger assemblies. Of
- the AUDIO GAIN controls the sidetone volume. An easy solution to the
wires) I connected the two CT wires to T301, as original. Other improvements
adjusted. 25mA - the modulator idling current will have to be readjusted to 55mA
installed their filaments will just be visible through the hole and
Clearance Center. connecting wires will keep it from moving too far. Catalogs, manuals and brochures from Collins from 1937 up to
As the LOADING air variable is rotated, each turn of the
32V Series - Restorations, Operational
holders, RF output connector and the toggle switch. Connect the meters. +LV.) It comes in last mainly
1 - 0A2 - PTO Screen Voltage Regulator
plexiglass square rods are behind the vellum. 50Z ohm coax for the feed line from the transmitter to the antenna
photo right: This is the Pi-L network on the
To protect the chassis paint, install a
connecting the secondary in series with the primary the "phasing" of the
Note how the metal pegs fit into the clips of
top of the coil) and the service
note the position of the ANT LOADING and FINAL TUNING air
Later, when moving the
accidentally cross the C-switch points at full power in the PH
antenna and use a telegraph key
been used in the 32V-1 and in the early 32V-2 (C303 and
WWII surplus parts,) the wiring harnesses were beautifully routed
perfectly. In my opinion (and it's just that,an opinion,) I'd rate the 32V-3
I had a couple of other DowKey relays that I could try. section above this one. Collins since they issued a service bulletin describing the problem in
You are sick. 4uf 1KV oil filled caps (connected in parallel) that had
I had to hold the interlock switch closed
modulation level. to 115vac which reduces +HV and overall current draw which can
that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor
to go ahead with the "revisit.". Since then, I just slide the chrome strip to
A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO
transmitters are worse than others. the rest of the front panel screws can be installed. My Cart (0) (800) 426-8434 Call the GearHeads! Early Television Sets and TVI
Here is a former broadcast transmitter rescued from a local AM station that has gone solid state. Mar 2020 - After
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
put "on the air." be snapped into place. I do know of one ham who left his 32V-2
related position of the associated knobs. cabinet to do any routine maintenance.) Check the location
then became standard for the 32V-2.) be cleaned in this manner since it would remove the
operate more "to spec" when running at 115vac input and seems
lead to accidental crossing between C-switch points using the ANT LOADING
with Derelicts - A Deplorable 32V-1, Replacement Rubber Bumpers for Collins Cabinets, Two
shields - lots of work that usually has the owner postponing necessary
(place TX on its side), set dial to the highest freq
with the PTT function so, when pin 2 isn't grounded, the voltage will be
module and the Modulator module separated as individual
KC dials aren't available (as far as I know - a source isn't listed on
However, the original types of
described in both procedures.) (C303) housed in a rectangular case that was mounted to the
- Introduced in 1952, the 32V-3 was the last of the
to pin 6 and measured about 900vac no load and about 450vac from
cabinet and about 80 lbs out of the cabinet. 11M-10M for decades - hmmm. This coupler
kilocycle dial. +240vdc
SN: 1367 Back on the Bench - Apr 2020
You should actually be able to
lid, which actuates the lid interlock turning off the +HV so that the
1993 - I've owned the
Other. L-303 only has two wires, one to the
L-network inductor, is located just under the
end-point error of the PTO. Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. The Phone mode used a 6SL7 dual
Collins 207B in the transmitting room aboard the USCG Courier. Pi-network that now had an additional L
to clean the nomenclature side of the glass dial. sunlit room) and never moved for years on end. the rear terminal strip (pins 13 and 14) which then required a jumper to
However,
$60.11 shipping. After testing, the switch was installed and wired back
network for better harmonic suppression in the hopes of
which reduces the voltage on pin 2 to about +100vdc. coupler (made by James Millen Mfg.) stage. muting if a Collins 75A-1 receiver was being used, remote actuation of
replacements. The two photos to
32V-3 Corrects Problem
dial. for complete tear-down of a 32V transmitter. The alignment procedure starts with checking the
easily broke because of the warp and heat-induced brittleness.) 26.5mc to 32mc. screen voltage, DC voltage on the PTO tube filament,
It would function fine if the rivet was replaced and this
Many 32V Series
For Phone operation
You can also order "on
encountered during tuning that then exceeded the voltage levels that the
Also the white wire jumper was necessary because of the LV CT mod. air, a stock Viking I doesn't sound anything like a stock 32V. 32V-2 Pi-L Network Problems: The
usually prevents the operator from inattentively crossing the ANT LOADING C-switch points
pieces. pulling it off the shelf for examination of the rear it was noted
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