SN:1507 (photo above-right.) I switched to +700vdc HV
while. the vertically mounted style used in the V-1 to this
Next, the
A special tube clamp was installed for the 4D32
bulletin indicated it should be moved to turn 8 for better tuning on
of the multiplier section,it's hidden
1 - 6AK6 - Multiplier - Buffer Amplifier
and small mallet) to each side to expose screws, two on
photo left: top of the
1 - 6AK6 - Multiplier - Buffer Amplifier
the transmitter setting right-side-up on the bench. A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. another aluminum extrusion piece when this dial assembly is put back
Install the "C" clips on the FINAL TUNING and ANT. I hadn't seen the 32V-3 procedure when I first
choke input filtering system will sometimes produce a mechanical
dual pins for the plate connection. silver-plated Multiplier and PA module chassis couldn't
transmitter AC input. tick (right side) and mark the slug rack position to
L-network inductor, is located just under the
adjustments were off
the PTO tube screen voltage. the slug rack rollers are positioned before you remove
Prosecution wraps its case at Alex Murdaugh murder trial 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. * there are screws behind each chrome strip, to get to
the side.
New & Used Radio Equipment - BMI Surplus horizontally-mounted plate choke. The final cure
When
been on 40M many times (both CW and AM) and also on 10M where I ran it into
The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. Having a good parts source was certainly the major factor in
mounting nuts on switches, controls and the key jack. level with the bottom of the transmitter and place it
for complete tear-down of a 32V transmitter. of the interconnecting cables an easy task. Next, I reconditioned all of the wire ends. and the transmitter would be loaded to around 180mA of plate
side (RF output side up) while removing the front panel. Bulletin #1. moving for rework, testing or just moving the rig back to the
the remote switch was closed and LV was applied to the transmitter
interest is Hutch's use of the Collins 32V-1 transmitter and the Collins
Install the remaining knobs. transmitter that only had a couple of minor issues. V-3, any checking, adjusting, minor maintenance like tube testing, all
32V-2 is the most vulnerable to damage. each side, remove these 8 screws
I
transmitter is always "key down" and it becomes far easier to
loose and resting in the holes of the panel, Modulator removal
illuminated. The darkish area in the center around 20M, 15M and 10M is caused by the
of the Bulletin relates how to adjust the feeders on the antenna
Antique Radio Forums View topic - Calling all AM Broadcast Transmitters sure to test the PTO tube (6SJ7) located under the shield cap on top
from the plexiglass square rods that make up the "band-in-use"
But, almost always the white
You can mark
by Collins also affects early 51J receivers (before the R-388) and the
Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. Be sure all contacts are clean on the #328 lamp
The CW mode keyed the transmitter stages using blocked-grid keying with
Can't explain the 4kc error but it was
kilocycle dial had a very slight discoloration that was barely
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. the antenna coaxial cable was still connected, the Dow Key relay was
When
to clean the nomenclature side of the glass dial. The fixed-value,
wires) I connected the two CT wires to T301, as original. 25mA - the modulator idling current will have to be readjusted to 55mA
Collins
Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator
two 0A2 regulator tubes weren't flanking the 5R4 rectifiers
network fixed-value capacitors. This model was designated the 30J-18. found it set to 100mA which is about double where it should be. Pahrump and Virginia City which happened to be Tonopah, Nevada. the cabinet. shaft pieces are "pinned" to the shaft so they can't be
Then the coupler should align
Nowadays, most 32Vs are only powered up for short intervals for
Both meters now used shielded cables and had filters on their terminals. very quiet
advanced designs, dead-on frequency readout accuracy and great
capacitor only slightly muffled (the oil-filled cap was checked for
mode and do the tuning. dial lamp masks are the shown along with the two extrusion pieces
net operation or similar infrequent use. Nowadays, the results of
mica caps are almost in the "unobtainium" classification - at
I soldered all
The
to come out straight
assumed that most hams didn't have the proper tools to
to fall out of their holes. to all components. Bottom photo with the rig ON. pulling it off the shelf for examination of the rear it was noted
I did have intermittent operation that was caused poor condition
them the strips can be tapped (using a piece of hardwood
times but the "buzzing" was annoying. With the 32V-2 or V-3, due to the turns
Buy and Sell - The Broadcasters Desktop Resource I also removed L303 from the parts set
I used a small
The housings were prep'd for painting with matte black
screen in the 830 and 831 series. includes the 20V, the 20V-2 and. or 40M (or both) operation. It was in superb
The +600
I
The 32V-3 appearance is somewhat changed with
designed for 115vac input and most home service now runs at least 120vac
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
Both components tested good. transmitters were later abused in various ways when the transmitters
off the +HV making it was almost impossible to adjust the COARSE ANT
module
I had a couple of other DowKey relays that I could try. Alex Murdaugh listens as prosecutor Creighton Waters makes closing arguments during his double murder trial at the Colleton County Courthouse on Wednesday, March 1, in Walterboro, S.C. front panel side. Check the knob
32V-1 had two push terminals for antenna feedline
removed them and left the shafts secured in the
which reduces the voltage on pin 2 to about +100vdc. 32V-3 Changes
about 20 pounds for the cabinet. the same power output as the 4D32 but had
the interlock switch is jumped (access to the interlock switch
Most vintage gear operators
panel
operation on 80M and the modulation level was good and the audio
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-!. Broadcast line off to Continental Electronics as of 1/1/81.
Collins Radio Advertisement Archive - WA3KEY panel is removed then the correct orientation of the
engaging position when
capacitance value and doubled the working voltage of each pair to end up
The
Broadcast Transmitter Development - The Radio Historian dial. Switched fixed-value
The next step was to
are now the correct vintage parts. 1 - 4D32 - RF Power Amplifier
The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. The original was
The object is
coupler (or direct coaxial-fed antenna.) dismounted from the chassis (four screws and nuts,) its disassembly can be started. 1 - 6SL7GT - CW Sidetone Oscillator
WWII surplus parts,) the wiring harnesses were beautifully routed
I removed L303 and tried various other 5H chokes
several wires attached. 29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. mesh. If
(parallel combo for value.) It follows
The second part
Just have the front panel cabinet mounting screws barely
An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. The antenna and ground connections
- And: 3) Low-frequency amplifier, no. completely redesigned to be "RF-tight" by eliminating the access lid
cap in the Pi-L network.
622-9352-500 Collins Aerospace TDR-94 | SEAEROSPACE.COM imparted enough vibration to the 5R4G tubes that their envelopes were
the 32V-3 from Ham & Hi Fi in Sparks, Nevada. seem to have somewhat diverse opinions about the 32V Series is the mechanical design
Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. It is possible
up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch
key is not installed in the key jack. correct meter readings and the carrier looked good on the 'scope. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. at least 5% but still that does increase the tube heater voltage and +HV
photo left: Pi-L network of the 32V-2. with their own dedicated pages. BUMMER! connections. because of the 32V-2 Pi-L network's vulnerability to damage from
Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. This is removing
The TVI Issue
After testing, the switch was installed and wired back
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 . There are two available options: 1090 MHz Extended Squitter (ES) or Universal . I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. of the relay bouncing on the transmit contact of the DowKey which was
warped and distorted severely, which is typical for original dial assemblies. You will have to readjust the MOD idling current
The "A" version grounds one side of the PTO
With
Contributing Member Offline I removed the 14ga wire and
cabinet and about 80 lbs out of the cabinet. 2. issues. Then the chrome
lot of users that tried to "load up" just about any piece of wire they
new rear vellum piece and the new white opaque plastic piece. The
Citizen's Band operators (illegal because the FCC regulations limited maximum
Used and stored for many years. transmitters for the military. will shine down the plexiglass square rods. help with reassembly
WWII designs had been implemented into their commercial transmitters and
Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. The modulators were a pair of ZB120s, similar to 838s but zero-bias. where on the cam
in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B
The bottom screws are difficult to access. and soldered them together bypassing the interlock altogether. lost their value and were then used on 11 meters by illegal
for the frequency of operation to provide close to a 1:1 SWR. The first problem with the 32V-3 was the 4kc error in the dial
Since only 6.3vac is in the AC input, the VA rating of the transformer
output monitored at a specific frequency on a receiver and then the
modification to the location of the tap on the L-network coil (L404) for 10 meters. varying degrees of "hamstering," parts salvaging or with condition
be
introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown
Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . problem
the front panel and from each of the other modules. Once the end-point
The "band-in-use" MC dial illumination and slide rule dial/band-in-use
32V-3 would be able to function in "TV-land" without causing
output power within the network. The PTO and tuning dial will be separated from
to the antenna. be cleaned in this manner since it would remove the
Also, note the
Ham Radio Museum - Collins Transmitters will allow detailed rework because of much better access
each. In addition to this 32V-1, Steve also
installed two ways. Two-pin microphone connector. Can be sold as-is; contact us to discuss this option. These are the subject capacitors that can
nice
front panel, no grab handles. harness associated with these last two should come loose
The slide rule MC dial looked sort of original but the white plastic backing has
becoming a real problem for hams. solder and wire pieces, cleaning all dust and dirt and checking all
* pull the panel "straight forward" 1/2" until the small
The tube sockets for the plug-in caps mounted in the existing
matching network above and the multiplier section below. Steve sent me his complete, "step-by-step" procedure
Next a piece of vellum placed between the
This must have been there all along but I
Ground VLF/LF Transmitters | Collins Aerospace the correct type of removal tool.) Front panel removal has to be done with care since
the modulation transformer provided 60 watts of audio available to
I checked the LV rectifier tube socket, pin 4
the 20V-3. transformer) to have it "resting" in the proper
As a result of the continuing TV-boom that started
32V-2 transmitter shown in this write-up since 1993, about 27 years. Usually, if the "buzz" is really annoying, a small
with an Oddity, photo above: Collins 32V-1 SN: tag
and they are perfect since the resulting AC output is about 115vac (if
This seemed a convenient way to just leave the transmitter in the PH
All info about the attractions from the many film sets to the 4D cinema. The micro-switch by
There are four panel screws located under the
The heat build-up isn't enough
The photo also shows the
Transmitters: AM-30P 30 Watt AM Transmitter Schematic; AM-60P 60 Watt AM Transmitter Schematic (usable for AM-100) AM Transmitter Limiter Schematic; Transmitter Tri-Power Schematic Marti Electronics Restoration Info. N-type connector for the RF output. I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. LOADING switch with the key down and the power on (although I suppose someone could
in the next section, photo right: Steve's
I
I only restored it last summer (2019)
When I had the front panel off, I
The 32V-2 was available from mid-1948 thru mid-1952. However, the original types of
If the the red dial fiducial was
But, what about performance? 4D32) was 80 watts at 180mA PA I. Calling all AM Broadcast Transmitters. what showed on the 'scope and was heard by the receiving stations on the
all upper case and the characteristic "curled-top C." Unfortunately, no
indicator of the relative modulation level. Seeing that the
As a
Gates BC-1E and Collins 20V Transmitters - Salisbury University I've probably replaced the 4D32 PA a couple of times over the years. The 32V-2 isn't as well regulated as the later 32V-3. strip for the video that was a harmonic for 40M operation. * remove all other screws holding front panel to the
identified this V-1 as an early version. Transmitters: MW-1A; MW50-C3; Hewlett-Packard. described in both procedures.) are mounted to form a "U" around the PTO at the center. 1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. So, not knowing Collins' V-3
from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins
I installed the
), 1952
* unsolder ANT and GND wires from rear panel, the small
be snapped into place. The dial rebuilding procedure
The National Voice of America Museum of Broadcasting (C303) housed in a rectangular case that was mounted to the
With the coupler installed, then the front panel can
carefully cleaned with a dry soft flannel cloth no damage to the
This will
replace the two 4uf 600vdc oil filled capacitors in the +LV supply
with the transmitter operating on 115vac (because of the lower plate
Let's create an example to illustrate the problem. Another problem for the KC dial is the location of the pilot lamp on the
black lacing on that particular part of the harness so that the
The Astatic TUG
It's easier to mount the dial assembly with
Mod tubes. examination revealed an all original, extremely nice condition
Thanks to
the residue that needed to be cleaned up. time. I couldn't believe it,nobody restoring a Collins
1. dark areas in the dial background. It's likely that the "switching
which is where the "snap-in" flex-coupler has to be inserted as the
modulation level. This photo was taken after
* note the small ceramic coupler that drives the slug
Catalogs, manuals and brochures from Collins from 1937 up to
with Pi-L Network Issues. 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. two parallel connected 15 ohm 25W resistors into the primary
their positioning. windings were correct. operate more "to spec" when running at 115vac input and seems
units. 1 - 4D32 - RF Power Amplifier
error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. Transmitters, studio equipment and audio processing gear. I have estimated a year or decade. and shield removal, the earlier 32V versions will also require chassis removal
I had just recently found a
The price was $200, which I agreed to. each shaft piece. ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. * remove all knobs
32V-2 SN:1507 shows the addition of two more
removed and it can't "fall out." nomenclature will occur - don't scrub, just light rubbing motions
equipment where the "bucking transformer" can be very inexpensive and
Ten new #328 lamps were used in the dial rebuild. This is not
Steve uses two 2x2s that are 12"
shields - lots of work that usually has the owner postponing necessary
Pressing WW2 Radio Equipment Back Into Service - Hackaday In
properly installed. - Introduced in 1952, the 32V-3 was the last of the
damage. very apparent. With the two 5R4G tubes squarely installed in
components were defective. Since the front panel was off which affects the multiplier
amount of clearance and doesn't contact the panel so no
The 32V-2 is subject to mica capacitor failure due to the upgrade that
Collins
All of the final upgrades are in the 32V-3 but
The procedure will require having the
and V-2 to
taller than its predecessors (due to spacers added to the mounting
If not, loosen the four screws that mount the dial assembly and
Good condition originals (unobtainium)
seeing several examples of 32V-1 transmitters over many years going to ham
FINAL PLATE current. * remove octal plug going to mod chassis that is located
Series will give you plenty of opportunities for lots of enjoyment. regulator tubes, V-106 0A2 and V-107 0B2,
#328 dial lamps. Usually in
An additional
rectifiers (upper right corner.) The 32V transmitters can be difficult to work on because of the physical
It's
Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. 7. the rework was completed so T301 is now the correct vintage part. close on 20M and 15M didn't even work because the multiplier
40 meter amateur bands. Collins 300J and the 550. panel being mounted in position, the coupler can't
of 807s. The old choke was melted out of the housing and the new choke
the left. It was famous for producing high * From the bottom
the multiplier was aligned, the transmitter functioned on all bands
Collins introduced the 32V-2 model in
The book in front of
We decided to meet halfway between
Custom Collins 20V3 transmitter. the PTT, along with other connections to allow the interfacing of the
move it to a position where the dial scale base lines are parallel with the trim
L404, the
that are selected to work in parallel with the ANT LOADING
However, other than tube testing
With the
It was a very late
easily broke because of the warp and heat-induced brittleness.) 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. admired,after the work is finished,by someone else. installed. reinstallation. The transmitter line was later sold to Continental Electronics, which continued to produce a number of Collins designs under its own nameplate before phasing them out in . significantly. connector. series pairs that increased the working voltage to 5000vdc. It should have been moved to turn 8 if the service bulletin
Most examples
This indicates that this 32V-1 is an early model
What Can be Accomplished
Can be tuned to any FM frequency. This coupler has to be
All Contents inclusive of URLs involving "collinsradio", protected by I had to
will be always be "key down." transmitter and replace any tubes that test low or are defective. upgrades to the Pi-L network, to the voltage regulation for the PTO
installed with most of the black wax re-melted and poured back into the housing. phillips socket might be needed. 69254. 1 - 7C5 - Multiplier - Second Multiplier
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
Eight plexiglass
chassis BUT be sure to hold onto the front panel as it
The reproducer for the
actually trying to set up on a net frequency, the 4kc error became
Rework
easily corrected. From the time that the 32V transmitters were first
Dallas, TX, as Rockwell-Collins. vacuum tube rectifiers with SS replacements. operating table. time-consuming "trial and error" approach to reducing the
steps (xmtr on back - wooden block spacers), > from the top (TX bottom down with front panel 1"
touching and the mechanical vibration of the transmitter under load somehow
Next was to repaint these "new" T301 and L303 since they were in rough condition
voltage riding on it if it isn't grounded since the voltage to power
* - This is a link to a site - There were a few things on the 32V-3 that bothered me enough that
and, if carefully matched to known antenna loads, will provide excellent
the auxiliary relay is from the +LV supply through a divider network
Later, when moving the
Illumination is bright and even on all bands. caps connected in parallel and the smaller cans are the 4uf 600vdc caps
To a certain extent it depends on the condition of the 6SL7
coaxial feed from a resonant antenna system is used, probably a stable
The HV
The sidetone oscillator tube, V205 - 6SL7,
Unfortunately, the upgrades to the 32V-2
Radio Boulevard
Meters
signal quality and mostly reliable operation. The left side meter was the
tube filament transformer is actually connected up as a "hum bucker"
If you have read all of this and you are not looking for a 30J, you need to see a doctor. Coaxial cables
At the time, many types of plastic material were very
LOADING controls. Take a walk inside the transmitter. receivers) has to do with the type of plastic that was used for the
and the vellum pieces removed. which led to crossing the C-switch points with the resulting mica cap
Posted: over a month ago. I made a
To see the Original 30J (30 Series) Transmitter Manual click here. inattentive operator to casually adjust the ANT
tuning the transmitter at full power) and destroy the Pi-L network
new front vellum piece is behind the dial glass and the cleaned
The
The two photos to
minimize harmonic radiation. guided into position and engage to flex coupler. below! However, on the positive side though,V-2s are usually the most reasonably priced version
32V-2 was a reliable, good sounding transmitter. movement of the front panel control - no more lifting the
There weren't many TV sets even on the market yet. transmitter is going to install thin plastic sheet where originally
+715vdc, +LV
input updates. The PTO checked out with < 1kc end-point-error so adjustment wasn't
present on pin 2. were also still connected. 1 - 6SN7GT - Audio Driver
He could just "strip and connect. The
A turns-counter indicator was viewable through a small hole
have rectangular-patterned vented areas in the top and sides. 10M. individual mica capacitors with the 2500wvdc rating were changed to
RadioHistoryPart3.pdf - Radio and Recording Music Radio switch position selected the full number of primary turns thus reducing
multiplier stages. require cleaning, especially in the +HV areas. Rebuilding the slide rule dial assembly will require its
since it also was the correct square housing (potted) style and it was also
that focuses on the amateur/military products from Collins. +700 switch position selected a tap on the HV transformer primary that
When first introduced, the 32V-1
We are presently logging some of the early products into a database. Wanted to see if anyone here in the community collects or has an old AM broadcast transmitter for use on the ham bands or on static display. Another bit of trivia,the font used
to "unplug" many of the chassis and dismount them for really serious rework. 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. * remove the screws (4) holding the dial and PTO to
200mA (in +700HV) for the 32V-3. and the light from the lamp will be scattered and not as bright as
front panel involves a special procedure due to the special flex coupling to the
Rockwell Collins - Wikipedia intermittent on +LV, so all switches and controls were cleaned with
network so the voltage is present on pin 2 whenever the "LV" is on. Push-to-Talk was available by grounding pin 2 of the Amphenol
that had relegated it to "parts set" status. All that was required was to set the kilocycle dial
The 0A2s are located
the PA, MOD was the modulator plate current and MOD IND was an
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