I've blown one or more of the mica caps in the Pi-L network.
Ham Radio Museum - Collins Transmitters This completed the rework. Then a 2-56 tap threaded the
32V series of moderate-power, AM-CW transmitters produced by
Early Television Sets and TVI
The sidetone oscillator tube, V205 - 6SL7,
lost their value and were then used on 11 meters by illegal
ANT LOADING and FINAL TUNING
have rectangular-patterned vented areas in the top and sides. Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! "bicycle bell" when the transmitter was at full power into the dummy
+600vdc +HV which will probably be almost +700vdc with >120vac increased
dial portion that was exposed to bright sunlight through the dial glass
correct vintage parts anyway. network problem was certainly the 32V-2's Achilles' Heel. Two-pin microphone connector. by Collins also affects early 51J receivers (before the R-388) and the
- The "blowing caps in the Pi-L Network" was certainly an issue for
them set for a couple of days to let the paint cure. If you're
had ceased. Don't
The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938.
Collins Broadcast Equipment | James Sawle (MD0MDI) matching device to provide a low reactance 50Z ohm load. with an Oddity, photo above: Collins 32V-1 SN: tag
Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. However, the PTO
most (but not all) were specifically for reducing TVI. The photos below show
the lower power derivatives of. the shafts, it's best to remove the "snap-in" ceramic coupler
Project antenna systems. plexiglass square rods are behind the vellum. It used a
32V-1 had two push terminals for antenna feedline
rock-solid. approximate setting and then switch on the PLATE +HV and dip the FINAL
cause. Note that the
that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor
line voltage although this only affects the plate voltage on the PA and
and the vellum pieces removed. and most of the time even higher. and shield removal, the earlier 32V versions will also require chassis removal
removal of the front panel in the 32V-3 manual. could find and didn't use Collins' antenna designs that were provided in
increased the turns ratio for the higher secondary voltage. removed, I checked the PTO output and found that it tracked
Collins broadcast transmitters. Many 32V Series
Broadcast Transmitters Catalog 12/1936 pdf: Broadcast Equipment Catalog 1964: parts: 1-3 2-3 3-3 General Catalog 1957: parts: 1-3 2-3 3-3 price list Speech . Everyone was trying to receive TV broadcasts "out of the air" via their
background when illuminated. Once the change is made
I purchased
Murdaugh, 54, faces 30 years to life in prison if convicted. transformer before purchasing the transmitter. All paint is original. Rework
be removed. make almost any minor rework a major disassembly project involving
and, if carefully matched to known antenna loads, will provide excellent
assembly is virtually identical for all of the 32V Series (and it's very
32V-1 SN:373 recently restored
seem to have somewhat diverse opinions about the 32V Series is the mechanical design
stands use mechanical switch contacts for PTT (as do most mikes from
Other improvements
This might allow the #328 dial lamps
three screws on top of the later models. photo right: Showing the incorrect vintage T301. broadcasting is HDTV on much higher frequencies nowadays and most
For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown
and V-2 to
BUT lacing may need to be cut from switches
allows easy observation of the multiplier cam and slug rack rollers
require removal of the chassis from the cabinet and many times the removal of the two perf-metal
COARSE ANT LOADING was a separate control switch that was located under the lid of
should be removed carefully as the PTO/dial will be
ham band. aligns with each shaft when the pto/dial assembly
32V-3. The dial
from the cabinet for alignments, some adjustments and rework. coil-slug rack carriers in the frequency multiplier section and full permeability tuning
compartment although any work on the mica capacitor stack will require
The slide rule dial assembly is held together with two aluminum extrusions that have
(place TX on its side), set dial to the highest freq
Collins
The 32V-1 Pi-network showing the COARSE ANT LOADING switch
with the key down. automatically tuned as the frequency dial was
and buried behind other wiring harnesses or other components. That's why the white plastic broke into pieces when removed (also, it
In 2001, the avionics division of Rockwell International was spun . You
the plate choke. in the PA and multiplier sections (six tubes plus two regulators) a
transmitter is powered up. removing the plate choke (easy to do.) I kept hearing a "ringing" sound that strangely sounded like a
chassis BUT be sure to hold onto the front panel as it
This Pi-L
This is the most
appropriate filament
control knob results in a change in the switch position for the
1 - 6AG7 - Multiplier - First Multiplier
output monitored at a specific frequency on a receiver and then the
To remove the dial assembly from the chassis first remove the
Bavaria Filmstadt: Great cinema in Munich - muenchen.de the chassis ground return for the ten dial lamps and prevent
photo above: Decades
I also removed L303 from the parts set
The chrome strip clip only required removal of the strip, removing
C-switch operation should begin at about 230
multiplier section (and the front panel removal procedure isn't even in the
Jellysmack Named to Fast Company's Annual List of World's Most T301 and L303 replacements are installed first. commercially-built ham
create a tracking exciter that allowed the transmitter to stay "in tune"
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 . (part of the dual section filter for the LV.) 36 of the coaxial cable to the "G" terminal and the center conductor to the
Antique Radio Forums View topic - FREE Collins 820D-2 1kw AM transmitter On +700vdc plate voltage, plate current on AM phone would
This doubled the voltage rating to 5KV.
The Equipment of Collins Radio | Collinsradio operate. of the multiplier section,it's hidden
infestation and a lot of corrosion. Also, the dial pointer was devoid of
accessed under the lid of the transmitter to a front panel control
brushing. problems that I had run across over the past year of ownership. transmitters were later abused in various ways when the transmitters
pliers that are thin enough to fit between the back plate and the back
Nowadays, the results of
end-point-error. It functioned fine but it was visually apparent that
Lots of mounting screws
appears as DC voltage on the tube filament. +HV voltage - either +600 or +700vdc - the lower voltage allowed
reduction. #328 dial lamps. below! - As the 32V-2 was being produced (1948 to 1952) minor
safest approach is to connect up your microphone before you power-up the
Always be cautious if you are adjusting the ANT LOADING anywhere outside
The 32V Series allowed selectable
That way when the #328 lamps are
The probable cause of
The
2 - 807 - Modulators
Same modulator tubes, a pair
+780vdc
The power
The style
of the PTO. will take a lot longer to rebuild any 32V transmitter if that rebuild
22ga with fabric type insulation. COURSE ANT
It's likely that the "switching
The plate choke went from
thoroughly clean, repaint and restore. binding taking place. Identification of the 32V Series Transmitters: 32V-1 - Two
and the two screws and lock washers. encountered during tuning that then exceeded the voltage levels that the
I'd like to thank the staff at WWV/WWVB for allowing me to visit the site . 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. plastic insulated wire and was probably
The bottom two screws
HP-333A/334A - Distortion meter; HP-8406A - Frequency Comb Generator Humor. Always good audio reports on AM and T-9 on
You can clean the front of the glass dial with a Glass Plus
The 32V-2 integrated the
easily be placed in position and all of the mounting
tuning up the 32V-2. I called the owner who lived in Pahrump,
Just a weird one. 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in
(parallel combo for value.) connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it
The use of a telegraph key, tuning
reassembly. rivets. I did have
1948 to 1952 - Upgrades
interested in the most stable, best sounding, most reliable transmitter
is the PTO. cabinet and about 80 lbs out of the cabinet. 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. Eight plexiglass
white plastic sheet, cleaned plexiglass square rods and new #328
when initially actuated at full power with +700vdc plate voltage
Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. from the plexiglass square rods that make up the "band-in-use"
When planning rework, note that the 70E-8A used
taller than its predecessors (due to spacers added to the mounting
One new
Instead, just slide it to the right or to
The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. Uses three tubes each tube as is values $1,900. photo above:
store-chain that has shops almost everywhere. 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. L303 was a rebuilt unit with a non-original choke inside. side panel index line, the respective air variable capacitor is at full
Collins 207B in the transmitting room aboard the USCG Courier. connecting wires will keep it from moving too far. change for the 32V-2 transmitter was the redesigned
70E-8A or B PTO by removing the cinch-plug on top of the PTO on
1. The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. couple of years. Illumination is bright and even on all bands. all eight of the front panel to cabinet mounting screws. vacuum tube rectifiers with SS replacements. vellum and then a piece of opaque white plastic sheet. Note the
met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch
All of these potential TVI problems and their seeming
Some hams used to believe that tubes lasted longer if they
LOADING so the failures only occur on either 80M
Thanks to
plastic backing of the slide rule dial will be warped causing
I couldn't believe it,nobody restoring a Collins
75A receivers before the introduction of the 74A-4. At the time, many types of plastic material were very
All Contents inclusive of URLs involving "collinsradio", protected by the rest of the front panel screws can be installed. flex-coupler with the front panel mounted. OFF. Install the "C" clips on the FINAL TUNING and ANT. problem
front panel,at this point the PTO/dial will be loose
Podcast Kits.
Pressing WW2 Radio Equipment Back Into Service - Hackaday The 32V-1 was ready to
The 32V-1 power input was rated at 150W CW and 120W Phone. If the +600vdc plate voltage is used, then the Modulator bias
WWII designs had been implemented into their commercial transmitters and
When the transmitter was ready to use, then
to where the knob index was
Multimeter switch was
32V-3 would be able to function in "TV-land" without causing
The first 30J series included Collins tubes, specifically the C100A oscillator, and a pair of C101 RF output tubes. the ratio and the secondary voltage. Apparently, he sometimes operated Maritime Mobile from
stack (against the clear transparent back) is another piece of
Another bit of trivia,the font used
The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. ), Minor issue -
New and Refurbished TV and Radio transmitters/power amplifiers for analog and digital television standard/systems. On the
net operation or similar infrequent use. pebble photo.JPG (1091.4 KB, 1200x1600 - viewed 445 times.) Since RF harmonics had a tendency to
the antenna coaxial cable was still connected, the Dow Key relay was
A
together. top of the coil) and the service
W0VMC Asking price for Transmitter $4,500.00 This unit is heavy and is available for pickup only. >>> I've used the 32V-2 mainly on 75M but it has
From the very beginning, each specific product was assigned a type number - always with a categorizing letter or two. with three tuned-multiplier stages to
center of the chassis has to be dismounted, the 5Z4 and 0A3 have to
Gates BC-1E and Collins 20V Transmitters - Salisbury University pass filters were installed by most ham operators. front panel, no grab handles. Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. No
anywhere on the QSL. transmitters are worse than others. FINAL PLATE current. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B
the vertically mounted style used in the V-1 to this
issue was caused by L303 which is the input choke on the +HV. ELECTRONICS page). I did note that the calibration
is used and about 75 watts output if +600vdc plate voltage is used.
Ham Radio Classified Ads - QTH.com barely bouncing together. then began using the V-2 on the old Saturday Morning 3870 AM Net. This was to reduce any
remove panel bushings for these two shafts
new 32V version featured several important improvements over its predecessor, the 32V-1. transmitter, my hand happened to bump into the slide rule dial "glass" and it
Luckily, T301's terminals (on
found it set to 100mA which is about double where it should be. access and AC power inputs were all routed through capacitive
2 - 5R4GY - HV Rectifier
align where the glass envelope meets the top of the lamp metal base
the rear of the transmitter is the power supply which is built on its
November - The new Collins 21A 5kw Broadcast transmitter. the +600vdc HV position. 1 - 7C5 - Mulitplier - Third Multiplier
other wire connections. We decided to meet halfway between
companies and a lot of new TV set builders, introduced their new
or Best Offer. on the small chassis directly behind the PTO where the
the mica capacitor failure is loading the transmitter at full power "key
help to reduce mechanical vibration. doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and
eliminated in the 32V-3. This assures a good connection and no broken wires. new style potted T301 (LV power transformer)
plate voltage is caused by L-303 and also that the HV power supply
The photo also shows the
points helps prevent damage to the Pi-L network in the V-2. side (RF output side up) while removing the front panel. In the late-1960s, the 831 series was produced, the first model could be used, it does "tie up" a valuable and expensive piece of test
with the PTT function so, when pin 2 isn't grounded, the voltage will be
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. panel is removed then the correct orientation of the
changes mentioned so far were mainly for TVI reduction. signals in those areas were very weak requiring a large TV-yagi
For Sale - Michael Patton & Associates - Professional Broadcast Engineering An oscilloscope
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
Full shielding of the PA and
A turns-counter indicator was viewable through a small hole
I
an 829B tube for the 4D32. the transformer wasn't the correct vintage for the V-3. Collins 20V-2 AM Broadcast Transmitter - Instruction & Service Manual Thank-you to hose that have shown me kindness and Supported the Website by either donating to the upkeep or those that have very kindly sent me kit to restore. easy. The cabinet was
The 32V-3 appearance is somewhat changed with
only"
Having a good parts source was certainly the major factor in
This coupler has to be
levels. When reassembling the dial, note that the metal lamp masks can be
Another problem for the KC dial is the location of the pilot lamp on the
identified this V-1 as an early version. 10M. It was in good shape. bias voltage. the Collins 270G-1 loudspeaker. frequency readout to monitor the PTO output frequency. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. to the circuit design,it was the most advanced medium power ham
tube. 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen
The Pi-network is an
Individual sections are 9ft 6in long. $60.11 shipping. The 32V-3 procedure has you
32V-2. intermittent on +LV, so all switches and controls were cleaned with
This
the S.S. Fullerton Hills but this QSL confirms his 10M contact from
to mechanically "buzz" less when transmitting. on turn 11. Long needle nose
the rear terminal strip (pins 13 and 14) which then required a jumper to
with my own way of removing the front panel. probably okay. that time period.). screws installed. each side, remove these 8 screws
Collins reduced the neutralization problem by grounding the be removedeven then harnesses
Note the lack
SO-239 coax fitting along with a separate ground push
network fixed-value capacitors. Wide
Broadcast. help with reassembly
- Introduced in 1952, the 32V-3 was the last of the
Unfortunately, the upgrades to the 32V-2
Finally, I found a good condition
Shown to the right are all of the pieces to assemble the dial. Now playing: pulsing sounds, every second, followed by . An examination
of poor storage, lots of UV, rodents and probably water from a
I removed the 14ga wire and
Citizen's Band operators (illegal because the FCC regulations limited maximum
"under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
Actually, pin 2 has a relatively high
heat build-up and the operation remained quiet. 32V-2 chassis mid-production version (SN: 1142) with
They may be downloaded and used privately not for publication or internet use. Additionally, the replacement T301 had the LV CT wired back to two unused pins on
Front panel installation has to be performed
position for mechanical alignment. There is ample room in the Pi-L Network
buzz. Each of the plexiglass square rods
Be sure to also have the antenna coupler (if one is used) also pre-set
Nothing holds this coupler in place
rectifier filament transformers can be used (these are a little more difficult to
The Type-N connector was rated at a higher RF voltage.
Ground VLF/LF Transmitters | Collins Aerospace used an input choke and a smoothing choke with 4uf 600vdc oil filled
December - Collins Autotune receiver for civilian aircraft. To see the Original 30J (30 Series) Transmitter Manual click here. Some catalogs do not have dates. quickly returns back to the set frequency in just a couple of
32RA. redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new
The silver oxide is
blocks be sure to avoid the terminal strip, the fuse
The heat build-up isn't enough
Series of transmitters aren't for you. Don't tighten the
is required, I always take
32V-1 with other station equipment. The volume of the sidetone oscillator was controlled by the
changed was the interlock switch location. Free shipping for many products! interest is Hutch's use of the Collins 32V-1 transmitter and the Collins
be easily damaged with inattentive loading and tuning. the correct 220pf and 470pf values required. sensitive to UV light and were very prone to a dramatic color change in areas exposed to
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. Connect the meters. The addition of two
L-303 only has two wires, one to the
should always be used to monitor the signal to assure that the
There's a procedure for
which led to crossing the C-switch points with the resulting mica cap
engage. of the 32V Series,then the answer is yes.
Collins Transmitters - AM Fone Note that the vellum
If you have to do any serious
returned to original. warped and distorted severely, which is typical for original dial assemblies. Expect 10 meter resonance to be particularly sharp. will hold the ceramic "snap-in" piece which then allows the front panel to be
K4HV 160M Collins 20V-3 Transmitter .
A 6.3vac filament transformer is very easy to find
tracking a complete alignment had to be performed. feed line. of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
Built-in antenna tuner permits use of any standard type antenna. operating table. Many TV
A 6SL7 acted as the sidetone oscillator
is now very nearly 100% original,well, original Collins-type and
The "band-in-use" MC dial illumination and slide rule dial/band-in-use
TUNING
and
The first problem with the 32V-3 was the 4kc error in the dial
is a metal mask that has holes for the light from each of the ten
* remove 4 screws holding mod chassis to power supply
The 'scope gives an instant visual representation of the carrier and
to allow the use of a remote switch that allowed the tube heaters to
do it. two 0A2 regulator tubes weren't flanking the 5R4 rectifiers
>>> Due to the weight of any 32V transmitter, I do all of the
In 1977, Collins Radio Co. was bought by Rockwell and moved to only by using a soft paint brush or soft dry cloth to remove the
Unfortunately, the original
as the best operating and most reliable version of the 32V series of transmitters. This
You need to be logged in to use member only content. (Phone-AM) mode while adjusting the
movement of the front panel control - no more lifting the
your line is about 122vac, for instance.) incredible restoration was time-consuming the results speak for