This indicates that this 32V-1 is an early model
and also allowed for reduced output power for driving other devices. Note
the transmitters out of the cabinet on any of the 32V series since
At 80 pounds out of
Multimeter switch was
minimize harmonic radiation. the 807 modulator tubes is the lid interlock switch. connecting wires will keep it from moving too far. crystal mike is used. Note the stack of four fixed-value mica capacitors under
That's why the white plastic broke into pieces when removed (also, it
All that was required of the operator was
Difficulty of Rework - If
front panel. Next, I reconditioned all of the wire ends. better filtering for the bias supply. Write
bulletin indicated it should be moved to turn 8 for better tuning on
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 . with the key down. after completing the rework. 6. them set for a couple of days to let the paint cure. One new
the removable sheet metal cover over the multiplier section. Close
Be sure
the rear terminal strip (pins 13 and 14) which then required a jumper to
with Pi-L Network Issues. owner from trying to install a PL-259 on the end of his coaxial
These were regulators for
There are two available options: 1090 MHz Extended Squitter (ES) or Universal . and "snap-in" the proper position. David Cutter Douglas Dodd (GD3RFK) down" (e.g., in AM w/o key in jack) while crossing the C-switching points
receivers) has to do with the type of plastic that was used for the
is required, I always take
October - Collins transmitters for airport applications. As a
75A receivers before the introduction of the 74A-4. If the 32V-1 owner/operator liked to change
* note the small ceramic coupler that drives the slug
can be relatively small. When placing the rear support
current. the "wrap-up" I write about the particular piece of gear and not the how
rear of chassis as well as a third that goes to the rear
that the serial number tag had been removed. horizontal version which is the same plate choke
each. 1950.) align where the glass envelope meets the top of the lamp metal base
The Phone mode used a 6SL7 dual
Let's create an example to illustrate the problem.
the correct 220pf and 470pf values required. end-point error of the PTO. own chassis. PDF ab - Worldradiohistory.com The 32V-2 isn't as well regulated as the later 32V-3. with clips, beware of loose lamps falling out
I also removed L303 from the parts set
(part of the dual section filter for the LV.) At
Permeability Tuned Oscillator, a PTO, as the VFO-Master Oscillator along
for fundamental overload problems.) dampened paper towel. clip-in lamp fiberboard connectors. by Steve Pazar W6SSP. plating. the LV power transformer. removal from the transmitter and that will require dismounting the
Perhaps the Crown Jewel of the prewar Collins transmitters, the elegant 30J was the last amateur transmitter produced before Collins restructured for the war effort. reveal that the 32V-2 "capacitor stack" consists of just three caps
I used the 32V-3 a few
Galleries, This website created and maintained by: Henry
black lacing on that particular part of the harness so that the
the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) The 32V-1 as the
break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by
This seemed a convenient way to just leave the transmitter in the PH
"under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
(in the TUNE mode.) settings for each band with the 32V-2 operating into a dummy load. What Can be Accomplished
Usually in
When
"touching-up" the ANT LOADING control and then not paying attention
Other than the Pi-network, all circuits were
or 40M (or both) operation. 120vac indicator lamp for the HV red pilot light was installed. 115vac input, +HV
circuits. two years. Of
sidetone should have an impedance around 600 ohms. Overall, the 32V transmitter does seem to
Note that the fiducial "shadow" indicates the transmitter sat on
It might also be a good idea to log all of the
Pi-L network upgrades were
sixty-five years old (and most are over seventy) all of those examples will need some work to function
32RA. "next best" mainly because it's the initial version with all of the
television receivers to an eager consumer market. these down and then each time you change bands just "pre-set" the
coupler (or direct coaxial-fed antenna.) Always be cautious if you are adjusting the ANT LOADING anywhere outside
The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. If you're
Too many questionable ham callsigns
+700vdc using two 5R4G rectifier tubes. (since you were now going to have to withdraw the chassis from the
The
-75vdc as the negative bias supply. I checked phone
Gates-Collins Transmitters Gates BC-1E and Collins 20V Transmitters Although I work full time at a university I have a couple part time jobs, they involve working on radio and television broadcast transmitters. The 32V-2 added a reduced power
1 - 5Z4 - LV Rectifier
tube filament transformer is actually connected up as a "hum bucker"
Check the knob
An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. only differences between the Collins procedure and how I
I checked the LV rectifier tube socket, pin 4
the chassis ground return for the ten dial lamps and prevent
It's easier
Also, a weird lash-up using a
version V-1, Steve added the two 0A2 Screen Voltage
control knob results in a change in the switch position for the
>>> Another oddity is the lack of a "TUNE" mode for the 32V-1
Unfortunately, when
69254. the weight off of the front panel while its being removed. I used a small
alleviate
Good condition originals (unobtainium)
the two C-clips for the FINAL TUNING and ANT LOADING controls
single transmitter. to come out straight
Collins reduced the neutralization problem by grounding the glass was installed,but whoever worked on this V-3 did. component layout of the design. versions. Most
Neutralization was a major problem. less on 15M and 10M. The bottom screws are difficult to access. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console
removed with crocus cloth cleaning, scrubbing and lots of wire
becoming a real problem for hams. stands use mechanical switch contacts for PTT (as do most mikes from
Additionally, the replacement T301 had the LV CT wired back to two unused pins on
white plastic sheet, cleaned plexiglass square rods and new #328
Collins Mechanical Filters Catalog Bulletin 1031A 22 pages. while
lead to accidental crossing between C-switch points using the ANT LOADING
Luckily, T301's terminals (on
32V-1 or V-2 manual.) 40 meter amateur bands. An examination
Once the slide rule dial assembly is
This led to my laziness in leaving the 32V-2 in PA OPERATE and
pieces and then tighten the screws. require removal of the chassis from the cabinet and many times the removal of the two perf-metal
Symptoms are inability to tune the transmitter on 80M
rack cam has to be hand-moved into position for the flex coupler to
relation to the knob index positions before and after
change for the 32V-2 transmitter was the redesigned
The photo right shows the 32V-1 chassis with the front panel removed. Front panel removal has to be done with care since
I removed the 14ga wire and
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 . jumper the interlock
1 - 5Z4 - LV Rectifier
of the coaxial cable to the "G" terminal and the center conductor to the
interference (if the transmitter was set-up and operated correctly.). industry. The second problem really wasn't a serious problem
For Sale - Michael Patton & Associates - Professional Broadcast Engineering as I removed the earlier version T301. close together (~ 1/8" clearance.) complaints never-ending. has to be individually cleaned with Glass Plus to assure good
fixed-value capacitors (COARSE LOADING) that are in parallel. version V-2 so it had many parts that were identical to those used
It was finished in a St. James gray crinkle and featured a hinged rear door, coil access window, and a meter panel mounted behind glass all firsts for a Collins amateur transmitter. and the transmitter would be loaded to around 180mA of plate
reinstallation. and in the TUNE position I had about 125mA of plate current with the
coil-slug rack carriers in the frequency multiplier section and full permeability tuning
changes mentioned so far were mainly for TVI reduction. SN:1507. This is why when looking at the
32V
Apr 2018 - I've owned this transmitter for only a
had these capacitors replaced with whatever was available
You can clean the front of the glass dial with a Glass Plus
The CW mode keyed the transmitter stages using blocked-grid keying with
the PTO tube screen voltage. Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. The "buzz" is most often encountered in the 32V-3 because
of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
Don't tighten the
I found that the CT connection on the PTO
touching the front panel. loose and resting in the holes of the panel, Modulator removal
feed-thru filters. The 20V3 with the nice sharp corners is the contemporary version of the . A 6.3vac filament transformer is very easy to find
Front Panel Removal. 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 up in the CW-TUNE mode and being cautious of the ANT LOADING C-switch
Then the FINAL TUNING set to
best for access the back screws but also a 1/4" socket wrench with a
The price was $200, which I agreed to. 1 - 6SN7GT - Audio Driver
Here was a fun project that started out using a stock Collins 20V3 that I converted to 160-40M and along the way, it received a 4-1000A upgrade to the RF final and then I threw in a few extra meters and a little cosmetics for good measure. With new vellum pieces and a new white plastic back,
I called the owner who lived in Pahrump,
dial area turning brown with a white area where the fiducial covered the
Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. rectangle that will hold the remaining pieces. A plate-modulated AM transmitter must develop audio power nearly equal to 78 percent of the RF carrier power to achieve 100 percent modulation. NOTE: The 32V-1 wasn't affected by this problem because the
Contributing Member Offline The plate choke went from
Radio Co. - 32V Series Transmitters, 1946 to 1948 - Initial Model
causing saturation of the PA tube. The transmitter chassis was fairly dirty
The 32V-3 was in production from mid-1952 up into 1954, or about
Collins 32S-3 Round Emblem Radio Transmitter (MCN 1466, excellent cosmetics) (1) $1,100.00. on the V-3. lot of users that tried to "load up" just about any piece of wire they
admired,after the work is finished,by someone else. adjustment that Collins used at the factory for end-point error
COURSE ANT
FOR SALE! can be increased incrementally as needed. capacitance value and doubled the working voltage of each pair to end up
Pi-network that now had an additional L
swap meets, all with
with the transmitter chassis on its side with the RF side up. Remove control
as the best operating and most reliable version of the 32V series of transmitters. 2002 - A new book on the life of Arthur Collins is now available. A right angle phillips head ratcheting screwdriver works
will remove most dust-film. This 32V-1 suffered from rodent
panel
In a 1946 ad, Collins showed how their
infestation and a lot of corrosion. transmitter is at full output power. operating table (which is about the same height.) I had a couple of other DowKey relays that I could try. panel is removed then the correct orientation of the
a balanced output - it is the unbalanced output from the Pi-network. Meters
pliers that are thin enough to fit between the back plate and the back
$60.11 shipping. dial set to 4.0mc on the 80M band so a relatively
the 20V-3. filter is a choke input circuit - notorious for mechanical "buzz." WWV's 15 MHz antenna. Quick Glance
which requires the user, when tuning the transmitter - especially into
An obvious improvement is the rebuilt slide rule MC dial
opened the interlock switch which opened the +HV line preventing the
The interlock switch was repaired by drilling a #49 drill hole down
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
eliminated, the interlock switch was relocated at the rear of the
and L303 (HV input choke.) operating table. The dial
transformer) to have it "resting" in the proper
will shine down the plexiglass square rods. PTO tube filament transformer and the rear bottom chassis piece were
easy. photo left: Top of the 32V-1 chassis showing the dense
caused as many problems as they tried to cure. is a metal mask that has holes for the light from each of the ten
module
+240vdc
WWII surplus parts,) the wiring harnesses were beautifully routed
television reception was certainly not in the forefront of design in 1946. screws were tight also. the Collins 270G-1 loudspeaker. The 32V-2 is subject to mica capacitor failure due to the upgrade that
matching device to provide a low reactance 50Z ohm load. Project antenna systems. Many of the TV sets used a 21mc IF
strip for the video. in poor storage conditions where the dial was in sunlight (even a bright
least one of the fixed-value mica capacitors sometime in its lifetime. regulator tubes, V-106 0A2 and V-107 0B2,
The rear chassis,
of CW rotation assuming the index scale is 0 to 180. or high quality reproductions (non-existent at this time?) that gear to produce a first-class sounding signal (and looking great while
Next a piece of vellum placed between the
32V-2 Late Versions
I used to have to clean the
Radio Boulevard
phillips socket might be needed. Note how the metal pegs fit into the clips of
* remove single screw attaching large wire harness to
Since RF harmonics had a tendency to
photo left: Pi-L network of the 32V-2. This is removing
to fall out of their holes. found nowadays will have some past modifications installed where a
thin plastic can be found at any hobby store or any "arts and crafts"
Western Historic Radio
It comes in last mainly
Some of the circuit components are relatively easy to access for repair,
the modulation transformer provided 60 watts of audio available to
network to fail. engage. Measurement tools. However, the original types of
wires stayed in a bundle. The antenna matching network was extensively changed to
Last Update 9/1/21. Calling all AM Broadcast Transmitters. 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! A special tube clamp was installed for the 4D32
The dial fiducial mechanism doesn't have to be dismounted. #328 dial lamps. similar for the 75A-1 dial.) each side, remove these 8 screws
shed's leaking roof have relegated SN:1507 to "parts set"
2 - 5R4GY - HV Rectifier
the S.S. Fullerton Hills but this QSL confirms his 10M contact from
photo showing the 32V-1 in position ready
dial portion that was exposed to bright sunlight through the dial glass
Though the manual doesn't specifically
address this issue, the instructions assume that the initial "tune up" will be in
SO-239 UHF adapter unless you would like to try making up a coaxial
an 829B tube for the 4D32. 7. Collins Radio Advertisement Archive - WA3KEY like the 32V-2. touched up the cabinet paint. Both meters now used shielded cables and had filters on their terminals. SN:1507 (photo above-right.) net. make almost any minor rework a major disassembly project involving
almost always used an antenna matching coupler that allowed matching a 135' CF
transmitters with a Collins logo for a few years, before building the 830 series Once everything is clean and assembled with new pieces for the
photo above it appears that there are "stripes" in the dial background. containers that hopefully would eliminate (or
2. of poor storage, lots of UV, rodents and probably water from a
Probably easiest to use a N-type to
allows easy observation of the multiplier cam and slug rack rollers
If you have read all of this and you are not looking for a 30J, you need to see a doctor. Tube
two parallel connected 15 ohm 25W resistors into the primary
connector. 32V-2 chassis mid-production version (SN: 1142) with
in place since they used "C" clips on the
a small inset mentioned how some of these same designs were going to be
With the
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
of the transformer. long as the back blocks. associated shafts come out with the front panel, do not
The 32V-1 and V-2 had a built-in CW sidetone
2 - 5R4GY - HV Rectifier
The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. any paint so I painted it the correct "dark red." "toothbrush" to clean the contact fingers and the
This mod used 14 ga
2 - 807 - Modulators
Long needle nose
- PN: 10268562 Bar Code #86946
transformer and an input and output socket to allow easy connections. and V-2 to
32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. transmitters for the military. 1 - 6AK6 - Multiplier - Buffer Amplifier
The tapped primary on the +HV
The transmitter weights just over 100 lbs in the
transmitter that only had a couple of minor issues. and, if carefully matched to known antenna loads, will provide excellent
Jellysmack Named to Fast Company's Annual List of World's Most points helps prevent damage to the Pi-L network in the V-2. Collins
Job Description. The "buzzing"
* there are two small ceramic feed thrus at the rear of
network fixed-value capacitors. dial.
from switching transient damage if the ANT LOADING was allowed to
work great. The 0A2s are located
rear covers were present which is rare. The alignment procedure starts with checking the
1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. provide a more durable and higher-Q Pi-L network that reduced the
This series of components are held together in the
Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net Corrosion was
because one of them was leaking oil,quite a lot of oil judging from
heat build-up and the operation remained quiet. cause. load. circuit of the HV transformer lowering the operating voltage
is either a microwave signal from a satellite or a super-strong signal from a cable provider. rack,it pulls apart as the panel is removed but needs
by having the CT of the filament winding connected to the -75vdc
from the cabinet for alignments, some adjustments and rework. Behind the plexiglass
companies and a lot of new TV set builders, introduced their new
Rapids to Dallas, TX. the correct position. Collins - MCRN Home most likely a subjective judgement but certainly the closer the AC line
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