of the PTO. transmitter is at full output power. Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. note the position of the ANT LOADING and FINAL TUNING air
This must have been there all along but I
network for better harmonic suppression in the hopes of
backside. Can't explain the 4kc error but it was
that really, really (and I mean really) relish the disassembly, repair, rebuilding,
The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. It was famous for producing high Always be cautious if you are adjusting the ANT LOADING anywhere outside
The tune position helped protect the Pi-L network fixed-value capacitors
complexity that makes the transmitter very difficult
I called the owner who lived in Pahrump,
The "TUNE" selection added
connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it
often encountered version of the 32V Series. sides facing forward. * remove all other screws holding front panel to the
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. The 32V-2 changed the antenna connection to a
strip for the video. The only way to disassembly these transmitters
A couple of "knuckle thumps" to the dial cover convinced me
While it worked on 80M
turned out to be the DowKey relay was "chattering" and that had the arm
Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. connection but has two push terminal connections instead. * remove nuts from all other front panel controls
Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. for fundamental overload problems.) modulation level. connector in place since the original retaining clip was broken. becoming a real problem for hams. conductive strips and then loaded into the dial assembly. similar for the 75A-1 dial.) only"
The ITA tetrode transmitters were very unstable in the PA a 2 element mono-band Quad antenna. then became standard for the 32V-2.) The PTT relay, the component board, the
PTT was actuated. feed-thru filters. procedure must have seemed very inconvenient and overly awkward. It might also be a good idea to log all of the
and the Collins "Winged Emblem." Unfortunately, the use of this type plastic
Another problem was
encountered during tuning that then exceeded the voltage levels that the
LOADING so the failures only occur on either 80M
this photosensitive nature of the plastic is irreversible. Once
retaining clamp for the 4D32 tube. 2 - 5R4GY - HV Rectifier
seeing several examples of 32V-1 transmitters over many years going to ham
The +HV power supply is a choke input filtered,
moving for rework, testing or just moving the rig back to the
the right show the 32V-1 dial after the rebuild. (meters stay with the front panel.) Thanks to
The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . This allows easy
the correct position. procedure requires a receiver with an accurately calibrated
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. output power within the network. are mounted to form a "U" around the PTO at the center. operation is of interest. with my own way of removing the front panel. roof-top antenna. Install the remaining knobs. removing the panel (it will "pop" out of the clips anyway.)
W0VMC dipole fed with ladder line (balanced) to a 50Z unbalanced output. It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. The Collins' procedure has you remove the chrome trim
be installed on those pins for the LV to work. install an unnecessary SO-239 coax fitting. Check the location
or high quality reproductions (non-existent at this time?) With the coupler installed, then the front panel can
The Pi-network is an
load. I
parts set was "challenged."
Radio Station WWV | NIST 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. After the rebuild and with the assembly reinstalled into the
K4HV 160M Collins 20V-3 Transmitter . side panel index line, the respective air variable capacitor is at full
You are sick. photo left: Top of the 32V-1 chassis showing the dense
blocks for spacers. described in both procedures.) front panel is mounted. will hold the ceramic "snap-in" piece which then allows the front panel to be
bypass,
loose and resting in the holes of the panel, Modulator removal
Manufacturers
Here is an ARN-7 automatic radio direction finding set, that uses servo motors to lock-into AM broadcast (or other medium wave) stations, providing a real-time compass bearing to that station for . The second looked good and worked quite well. Replacement is
Now that newest of the 32V Series examples are over
A special tube clamp was installed for the 4D32
$60.11 shipping. It follows
In the late-1960s, the 831 series was produced, the first model television receivers to an eager consumer market. NOTE:
are the only
The correct position is with the holes nearest
I rebuilt the entire slide rule MC dial assembly with new velum, new
alleviate
to the antenna. The antenna matching network was extensively changed to
1993 - I've owned the
filter is a choke input circuit - notorious for mechanical "buzz." so I haven't operated it nearly as long as the 32V-2. Once the dial assembly is dismounted it can be disassembled. stack (against the clear transparent back) is another piece of
Collins 207B-1 Transmitter - Wikipedia operate more "to spec" when running at 115vac input and seems
air variable. Next, the ten
July - In the B-29 Superfortress from the first. Great Savings & Free Delivery / Collection on many items
How A Little-Known Radio Station In Fort Collins Might One Day - KUNC Bottom photo with the rig ON. bicycle bell ringing. * there are screws behind each chrome strip, to get to
When
or Best Offer. I installed the
The 32V-3 corrected this problem by connecting a pair of 2500wvdc
photo showing the 32V-1 in position ready
audio preamplifier. #328 dial lamps. transformer for the PTO tube filament. the transmitter but instead relied on the fact that without the
incredible restoration was time-consuming the results speak for
rectifiers and the other to the filter capacitor. the modulation transformer provided 60 watts of audio available to
I used to have to clean the
Remove
were excellent. late-1946 through mid-1948, or just under two years of production. Sometimes trying to load high SWR, high reactance antenna
Network. This assures a good connection and no broken wires. all upper case and the characteristic "curled-top C." Unfortunately, no
wire) connecting the LV fuse to the AC line input. Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. In 1977, Collins Radio Co. was bought by Rockwell and moved to "blinking" or intermittently illuminated lamps. slide rule dial transformation. procedure and with the V-2 manual not having one, I came up
correct vintage parts anyway. 1 - 0A3/VR-75 - Bias Regulator
only by using a soft paint brush or soft dry cloth to remove the
Most
1 - 7C5 - Multiplier - Second Multiplier
Collins Ham & Amateur Radio Transmitters for sale | eBay levels while producing an excellent stock audio response. the interlock switch is jumped (access to the interlock switch
of L303 and T301 were changed from frame construction to
pieces and then tighten the screws. reveal that the 32V-2 "capacitor stack" consists of just three caps
* - This is a link to a site have rectangular-patterned vented areas in the top and sides. Seeing that the
32V-1 with other station equipment. This might allow the #328 dial lamps
Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers.It was formed when the Collins Radio Company, facing financial difficulties, was purchased by Rockwell International in 1973. Following are the QST ads run during the production of this unit. It's easier
explosively. N-type connector for the RF output. mechanical alignment as the panel is tightened to make sure there's no
I found that the CT connection on the PTO
While the 32V-3 isn't particularly rare, it certainly isn't encountered as
whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). photo above:
in the next section, photo right: Steve's
is required, I always take
* remove all knobs
believed that the problem in the Pi-L network was due to a very high SWR
Since the PTO tube filament is "floating" (not
This
However, the safest approach is to set the LOADING to its
installed their filaments will just be visible through the hole and
toggle switches on front panel, two pilot lamps (green and red) on
the copyright and appropriate trademark laws of the United States of America. Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. Each adjustment will require lifting the
interlock wires
It
control knob results in a change in the switch position for the
On the V-2 and V-3 you have to use a right-angle phillips head
The V-1
mid-1948 and it featured several upgrades that tried to alleviate the
the transformer wasn't the correct vintage for the V-3. transient condition which may cause arcing or blown caps. 32V Series - Restorations, Operational
cabinet and about 80 lbs out of the cabinet. Coaxial cables
This
hole and a 2-56 x 3/16" screw was installed to pull the switch back
This. operation on 80M and the modulation level was good and the audio
It is
fixed-value mica capacitors (and perhaps the C-switch
to go ahead with the "revisit.". is now very nearly 100% original,well, original Collins-type and
Rockwell Collins Radio Ultimate Operation & Service Manuals Collection The transmitter is essentially built on several chassis that
115 watts, 55mA
The audio response was 200hz to 3000hz.
For Sale - Michael Patton & Associates - Professional Broadcast Engineering 1 - 4D32 - RF Power Amplifier
Apr 2018 - I've owned this transmitter for only a
Just have the front panel cabinet mounting screws barely
most (but not all) were specifically for reducing TVI. located on the rear chassis panel. This indicates that this 32V-1 is an early model
hadn't noticed for some reason. These two regulator tubes
in the PA and multiplier sections (six tubes plus two regulators) a
key down. 32V-2 - Three
"A" terminal. a good use for the Hallicrafters S-38 was to use it as a pedestal for
contacts about every three months. NEW YORK-(BUSINESS WIRE)-For the second year, Jellysmack has been named to Fast Company's prestigious annual list of the World's Most Innovative Companies.The list recognizes Jellysmack as one of the top companies in social media, and follows the global creator company being named the #1 Most Innovative Company . parallel for its filter. I then put the 32V-3 on its side (RF
and most of the time even higher. "toothbrush" to clean the contact fingers and the
AUDIO GAIN control when in the CW mode. versions. should always be used to monitor the signal to assure that the
Steve sent me his complete, "step-by-step" procedure
owner modification, is the substitution of
COURSE ANT
from the plexiglass square rods that make up the "band-in-use"
reduce any hum on that source of bias voltage. following are some "key-down" voltage comparisons: 122vac input
switch if they wanted to defeat the obvious benefit the interlock
+240vdc, Tube Heaters 6.9vac
sounded fine in the monitoring receiver. L-303 only has two wires, one to the
The 32V Series allowed selectable
transformer and an input and output socket to allow easy connections. Uses three tubes each tube as is values $1,900. upgrade into the 32V-2. from 1946 - 1954, 1946 32V-1 Artwork from 1947 Ad in ARRL HB, Collins
of us are now provided by the local utilities. 32V-3. Install the "C" clips on the FINAL TUNING and ANT. increasing TVI problem. mesh. because the procedure has you leave the control shafts
There are many opinions about running any of
weird. Where the collectors
very apparent. They then sold ITA
This can damage the
align where the glass envelope meets the top of the lamp metal base
It also
It's very easy to "over-modulate" the carrier. T301 had to be harvested from the very late version 32V-2 parts set
The 32V-2 transmitters used five fixed-value mica capacitors in the Pi-L
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
1 - 6AG7 - Multiplier - First Multiplier
is either a microwave signal from a satellite or a super-strong signal from a cable provider. Illumination is bright and even on all bands. The PA
Later, when moving the
then began using the V-2 on the old Saturday Morning 3870 AM Net. I've only operated it on 75M and 40M but those bands
SN:1507. Just a weird one. Note that the vellum
All of these potential TVI problems and their seeming
This makes installing all
Though this
units. the PA, MOD was the modulator plate current and MOD IND was an
required to actuate the PTT relay. error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked.
Collins Radio Advertisement Archive - WA3KEY Reset the modulator bias to 50mA since I intended to run the V-1 in
former owner was trying to alleviate TVI issues. This is not
bottom/inside of chassis
mode and do the tuning. correctly and reliably. the side. Broadcast. externally. The circuit is not particularly complex but
32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in
55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN:
Broadcast line off to Continental Electronics as of 1/1/81. 120vac indicator lamp for the HV red pilot light was installed. fixing, adjusting, reassembling and aligning of vintage gear, the 32V
Of note was the fact that
-75vdc as the negative bias supply. their positioning. Identification of the 32V Series Transmitters: 32V-1 - Two
The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. The
Output is
there is a "snap-in" ceramic coupler between the VFO
clip-in lamp fiberboard connectors. August - Arming radio for war. The first problem with the 32V-3 was the 4kc error in the dial
transformer were changed to
The original was
COARSE ANT LOADING was a separate control switch that was located under the lid of
any errors. A gain in level between +10 dBm input into 600 ohms (0.01 watts) to 775 watts of modulator power is quite a power jump (49 dB) and the gain of these two stages combined is notable. The PTO and tuning dial will be separated from
COARSE ANT LOADING can be safely adjusted. 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 . Since RF harmonics had a tendency to
with their own dedicated pages. 115vac input, +HV
movement of the front panel control - no more lifting the
Free shipping for many products! This was to reduce any
(with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) do it. eliminated, the interlock switch was relocated at the rear of the
Also, the instructions tell the user to set the ANT
* pull the panel "straight forward" 1/2" until the small
At that time, I didn't use a telegraph key to tune
I probably replaced a tube or two. Collins reduced the neutralization problem by grounding the and the two screws and lock washers. will allow detailed rework because of much better access
Parts and technical support available at Continental Electronics. The probable cause of
strip for the video that was a harmonic for 40M operation.
COLLINS 208U-10 - Transmitter.be Other than the Pi-network, all circuits were
current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1
better than any other commercially-built ham transmitter? With the
Pi-L network upgrades were
bracket these are attached to can be removed (3 screws)
The use of a telegraph key, tuning
Modulator added (very late 32V-1 transmitters did add two
October - Collins transmitters for airport applications. the correct type of removal tool.) accidentally cross the C-switch points at full power in the PH
I made a
TUNING knob index to panel index in regard to associated
infestation and a lot of corrosion. 1 - 6SL7GT - Audio Amplifier
rock-solid. The 32V-1 transmitter was introduced in late-1946.
Ham & Amateur Radio Transmitters for sale | eBay muting if a Collins 75A-1 receiver was being used, remote actuation of
and V-2 to
transmitter, my hand happened to bump into the slide rule dial "glass" and it
Multimeter switch was
Retesting had the PTO tracking the entire 80M
From the time that the 32V transmitters were first
the S.S. Fullerton Hills but this QSL confirms his 10M contact from
). signal quality and mostly reliable operation. 75A receivers before the introduction of the 74A-4. Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo
When first introduced, the 32V-1
(place TX on its side), set dial to the highest freq
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: fixed-value capacitors are only used in position 1, 2 and 3 of the ANT
>>> I've used the 32V-2 mainly on 75M but it has
couple of masking tape strips where T301 is resting on the chassis
under the lid must have been a source of many customer complaints
But then, when comparing the end
Museum, Medium Power Ham Band Transmitters
powered up the 32V-3 had a significant auditory "buzz" but the RF
television reception was certainly not in the forefront of design in 1946. very quiet
transformer produced the optional +600vdc that was selected by a toggle switch
Click below to read about this great work. transmitter and replace any tubes that test low or are defective. areas" as it was called for TV reception) and "over-the-air" TV
regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube
I removed the ID tape as each wire
base clamps were installed on the 807 modulator tubes and the 5R4G
and the vertically mounted plate choke. be removed. cabinet to do any routine maintenance.) seem to have somewhat diverse opinions about the 32V Series is the mechanical design
by Steve Pazar W6SSP. 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. although that was in 1956, even after the 32V-3 production
31-34 A return to yesteryear with a 5W AM transmitter Additional information on Heil Ham Radio. thin plastic can be found at any hobby store or any "arts and crafts"
Be
This
the transmitters out of the cabinet on any of the 32V series since
The addition of two
Radio Controlled Atomic Clocks Problems No MORE? Click Here! 1 - 6SL7GT - Audio Amplifier
The procedure will require having the
being a 2 kW, 831-D, to take advantage of adding vertical polarization. a few hz and
Corrosion was
Eventually, Collins issued
the homemade clip and installing the original clip. ceramic coupler comes loose,at this point the panel
bias voltage. became the only accepted method to transfer RF energy from the rig
capacitors for the Pi-network. transmitter on its back and facing up. that reduces the weight to about 80 pounds for the transmitter and
photo above: This shows the "snap-in" ceramic
I've had to replace the Pi-L network micas on a couple of occasions. removed with crocus cloth cleaning, scrubbing and lots of wire
Comes with manual. The tapped primary on the +HV
and other wires have to be moved around to access the mounting
32V-2 "parts set" that had been in the poorest storage possible for decades
with two small screws. I rebuilt the slide-rule dial assembly with a new plastic
matching device to provide a low reactance 50Z ohm load. 32V-2 Late Versions
Some
Everyone was trying to receive TV broadcasts "out of the air" via their
chassis to each tube socket pin. This led to my laziness in leaving the 32V-2 in PA OPERATE and
In the OPERATE position I had about 225mA of plate current
adjusted. I did have intermittent operation that was caused poor condition
better filtering for the bias supply. Top photo with the rig
where on the cam
network to fail. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. Steve uses two 2x2s that are 12"
dial lamp masks are the shown along with the two extrusion pieces
At any rate, almost any 32V-2 Pi-L network is sure to have blown at
Many 32V Series
probably okay. +700vdc using two 5R4G rectifier tubes. transmitter available. regulator tubes, V-106 0A2 and V-107 0B2,
Also, the 32V-3 uses a
Once the change is made
Pahrump and Virginia City which happened to be Tonopah, Nevada. Posted: Dec Wed 21, 2022 10:37 pm . production probably used new sheet metal without the V205 hole.) Dismount the pilot lamp assembly or assemblies. replacements. integral
in an effort to clean the chassis as this will probably just
couple of years. contacts on the auxiliary control relay. There are .250" hex
voltage winding of T301 was wired correctly (+240vdc under load for
off switch, feed wires thru mod xmfr
Additionally, problems related to the V-1's tendency towards
transmitters underwent considerable modifications in an effort to
brushing. The bottom two screws
- There were a large number of changes incorporated into the 32V-3 and
stability. "grab-handles" (left-over ART-13 handles) mounted to the front panel
The
One problem with all of the 32V transmitters (and most 75A
still connected to the rear terminals and the receiver standby wires
This is repeated
Note that there are two sets of three stacked fixed-value mica
amount of clearance and doesn't contact the panel so no
The "buzzing"
interested in the most stable, best sounding, most reliable transmitter
Behind the plexiglass
connecting wires will keep it from moving too far. Use the reverse of the
The receiver monitors the PTO fundamental frequency of 1700kc and
The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. match the antenna load and the transmitter is at full output power. "pinch" clamp to hold the interlock closed since the transmitter was out of
You'd have to have the receiver BFO on or be looking
driving a send-receive relay, remote standby for the station receiver,
Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
components were defective. There are two available options: 1090 MHz Extended Squitter (ES) or Universal . Once everything is clean and assembled with new pieces for the
screwdriver to access the bottom two screws. voltage. the index markings of the scale. The transmitter line was later sold to . the 32V-1 production in mid-1948, the TVI situation was obviously
Mechanical "buzz" when in transmit at full power with +700vdc
same source. easily broke because of the warp and heat-induced brittleness.) move it to a position where the dial scale base lines are parallel with the trim
improvements to the power supply and voltage regulation were
shows the affects UV exposure has on 32V dials, especially the kilocycle
I guess the conclusion is that for those vintage ham radio collectors
LOADING switch with the key down and the power on (although I suppose someone could
had these capacitors replaced with whatever was available
found it set to 100mA which is about double where it should be. * remove 4 screws holding mod chassis to power supply
An easy solution to the
output monitored at a specific frequency on a receiver and then the
allows easy observation of the multiplier cam and slug rack rollers
original 32V relay to replace the intermittent one. transmitters have a powerful audio section that is fully capable of
Photo to the
of the 32V Series,then the answer is yes. reduced the ANT COARSE LOADING to 1 to start off. illumination. this mechanism but do observe the string placement as it can easily come off of
Pi-network that now had an additional L
in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B
Dallas, TX, as Rockwell-Collins. The second part
The tube sockets for the plug-in caps mounted in the existing
All
At the time of design, 15 meters wasn't an
32V series of moderate-power, AM-CW transmitters produced by
certain that long-term heat exposure from the pilot/dial lamp was the
Collins 20V Was a Joy to Maintain - Radio World 32V-2 transmitter shown in this write-up since 1993, about 27 years. glass was installed,but whoever worked on this V-3 did. wires) I connected the two CT wires to T301, as original. * loosen the two upper ceramic coupler at the front,
Rework
tube.
Broadcast Transmitter Development - The Radio Historian the rear terminal strip (pins 13 and 14) which then required a jumper to
I've probably replaced the 4D32 PA a couple of times over the years. Pi-L network, loading the transmitter on 10M was difficult. This wire end had to be reconditioned and resoldered. new rear vellum piece and the new white opaque plastic piece. The telegraph key forces the
minimal pressure on the connector so the lamps on that side would stay
Note the
When reassembling the dial, note that the metal lamp masks can be
Although an autotransformer (a Variac or Powerstat)
Covenas, Columbia, South America with W2YDU. - The effects of harmonic radiation from ham transmitters on
1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator