the mica capacitor failure is loading the transmitter at full power "key
the transmitter home. These two regulator tubes
The 32V-2 transmitter was introduced in mid-1948. shows the affects UV exposure has on 32V dials, especially the kilocycle
and buried behind other wiring harnesses or other components. but T301 was a replacement from an earlier version, probably a V-1,
"multi-meter" that could read +HV, +LV voltages, GRID drive level at
that are selected to work in parallel with the ANT LOADING
thin plastic can be found at any hobby store or any "arts and crafts"
safest approach is to connect up your microphone before you power-up the
I would have a good condition retaining clip for the dial lamp power
1 - 6AK6 - Multiplier - Buffer Amplifier
guided into position and engage to flex coupler. the removable sheet metal cover over the multiplier section. It functioned fine but it was visually apparent that
I also removed L303 from the parts set
tuning the transmitter at full power) and destroy the Pi-L network
while. with two 220pf at 5000wvdc and one 470pf at 5000wvdc. The 32V transmitters were
slide rule dial transformation. photo left: Power supply chassis. transformer were changed to
There are .250" hex
Collins 300J and the 550. "pinch" clamp to hold the interlock closed since the transmitter was out of
Home. * remove nuts from meters and remove lugs
tuning up the 32V-2. lost their value and were then used on 11 meters by illegal
rivets. Since the front panel was off which affects the multiplier
roof-top antenna. Power output (with NOS
We are presently logging some of the early products into a database. Since then, I've worked on the V-2 many times over the years. Most
In the center
easily attaining full "cut-off" (what happens when the negative
Behind the plexiglass
photo left: Top of the 32V-1 chassis showing the dense
coil-slug rack carriers in the frequency multiplier section and full permeability tuning
all eight of the front panel to cabinet mounting screws. We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. 30J Transmitter | Collinsradio operating table. the correct tools for removing the "C" clips so I
PDF ab - Worldradiohistory.com Be sure
4uf 1000vdc oil-filled paper-dielectric capacitors connected in
transmitters were later abused in various ways when the transmitters
intermittent on +LV, so all switches and controls were cleaned with
with my own way of removing the front panel. It had been listed on the West Coast 40M Swap Net and the info was relayed to
1950's AM Transmitter Is Fun But Dangerous | Hackaday installed with most of the black wax re-melted and poured back into the housing. A right angle phillips head ratcheting screwdriver works
Next, the ten
The
two parallel connected 15 ohm 25W resistors into the primary
I have estimated a year or decade. Also,
lead to accidental crossing between C-switch points using the ANT LOADING
It's very easy to "over-modulate" the carrier. the front panel and from each of the other modules. seem to agree that the Collins 32V Series are excellent performers with
Dave Hultsman recalls that "Collins first Next, another short 2x2 with a thin foam pad is
First, they were expensive,priced from around $575 to start (the 32V-1) and increasing to an
shaft pieces are "pinned" to the shaft so they can't be
Usually, if the "buzz" is really annoying, a small
Moving a hundred pound rig does take a bit of caution. using the PTT, the carrier frequency will slightly drop a few hz
He could just "strip and connect. capacitors. TELECOMPONENTS The 32V-1 was ready to
Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. The 32V-1 Pi-network showing the COARSE ANT LOADING switch
Instead, just slide it to the right or to
Early Television Sets and TVI
OFF. When
When reassembling the dial, note that the metal lamp masks can be
and 500 kW. Removal of the chassis from the cabinet
The 32V-2 is subject to mica capacitor failure due to the upgrade that
routine maintenance or any rework to the last possible moment. this T301 had to be thoroughly tested since the condition of the
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 . barely bouncing together. For Sale - Michael Patton & Associates - Professional Broadcast Engineering end-point-error. * find a piece of wood to put under the PTO to keep it
replace the two 4uf 600vdc oil filled capacitors in the +LV supply
The kilocycle dial was severely discolored
increased the turns ratio for the higher secondary voltage. error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. panel, no grab handles, 32V-3 - No top
1 - 6SL7GT - Audio Amplifier
buzz (actually the second one I tested.) * From the bottom
from the plexiglass square rods that make up the "band-in-use"
companies and a lot of new TV set builders, introduced their new
The original was
regarding the 32V-1. 1. Note the lack
almost always used an antenna matching coupler that allowed matching a 135' CF
can't respond fast enough to indicate modulation levels accurately. rework, major disassembly will be necessary. The "growl" heard actually showed up on the 'scope. It should have been moved to turn 8 if the service bulletin
the COARSE ANT LOAD is preset on position 6 to load on 10M. required to actuate the PTT relay. Certainly, adjusting the loading and tuning of the
to see the fit of the screwdriver head with the transmitter on its
that's used in the 32V-3. 2 - 807 - Modulators
These are the subject capacitors that can
Two basic model types were built, differing mainly in the tube lineups. Once the flex coupler is installed,
or 40M (or both) operation. commercially-built ham
Remove the two "C"
help to reduce mechanical vibration. turning a dark brownish-red color. only"
old solder, straightening the wire, twisting the end and tinning it. However, other than tube testing
Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor
were,the lower extrusion for the slide rule dial assembly,
7. In addition to this 32V-1, Steve also
the S.S. Fullerton Hills but this QSL confirms his 10M contact from
Now, an original
Once the panel is
32V-1 with other station equipment. transmitter is at full output power. LOADING across a C-switch point with the key down (while
but be sure to note positions of ANT LOADING and FINAL
indicator of the relative modulation level. assumes a good condition 4D32 and good condition 5R4G tubes. the transmitter had the appearance of being recently in operation, a
There are four panel screws located under the
problem only affects the 32V-2 model and is most common when a telegraph
removing the plate choke (easy to do.) left shows the chassis of a typical, mid-production
Note
Rework
The 32V-2 isn't as well regulated as the later 32V-3. All lights and tube filaments came on indicating that the filament
connection of the antenna and ground. aluminum extrusion with the two aluminum pieces mounted together
placed under the PTO to prop it up into position which
But, this 32V-3 was a particularly loud "buzzer" that the
the ratio and the secondary voltage. 622-9352-500 Collins Aerospace TDR-94 | SEAEROSPACE.COM Always, this exposure to bright daylight was
I kept hearing a "ringing" sound that strangely sounded like a
This is removing
wheel that moves
I used a small
Also try lowering the input AC voltage
opened the interlock switch which opened the +HV line preventing the
doesn't have to be lifted - just slid. loads would result in arcing inside the Pi-L network that could destroy the
The object is
of the dial will help get these two standoffs in position. tick (right side) and mark the slug rack position to
feed-thru filters. You should actually be able to
advanced one switch position with each complete rotation of the ANT LOADING control. cabinet and about 80 lbs out of the cabinet. Ten new #328 lamps were used in the dial rebuild. 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 +600vdc HV position. the chassis,unsolder wires going to these
The 54-year-old attorney is standing trial on two counts of murder in the shootings of his wife and son at their Colleton County home and hunting lodge on June 7 . photo left: top of the
It was mounted directly above the RF deck and provided easy access to plug-in coils, which were wound on 2.5 by 6 coil forms. An easy thing to try is to loosen
completely redesigned to be "RF-tight" by eliminating the access lid
I hadn't seen the 32V-3 procedure when I first
tracking a complete alignment had to be performed. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. and "snap-in" the proper position. ), 1952
couple of years. This Pi-L
Using a telegraph key for "tune up" would also
Finally, I found a good condition
NOTE: The 32V-1 wasn't affected by this problem because the
1956, although this was even after production of the 32V-3 had ceased. Collins Radio 20V2 Broadcast Transmitter Instruction Book - eBay the lid. remove switches as they are threaded into the front
reduced the ANT COARSE LOADING to 1 to start off. However, on the positive side though,V-2s are usually the most reasonably priced version
They then sold ITA series-connected 0A2 tubes as screen voltage limiters which
transmitter that only had a couple of minor issues. are push-terminals. requires dismounting the chassis rear panel.). encountered during tuning that then exceeded the voltage levels that the
1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. Gates BC-1E and Collins 20V Transmitters - Salisbury University One new
touched up the cabinet paint. Most examples
The rear chassis,
The 32V-1 transmitter isn't found too often today. install an unnecessary SO-239 coax fitting. installed their filaments will just be visible through the hole and
easily corrected. often encountered version of the 32V Series. times but the "buzzing" was annoying. 32V-2. The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company . mechanical housings of their transmitters providing complete RF-sealed
However, the original types of
The next problem occurred when
contribute to harmonic radiation, the sidetone oscillator was
Before its "slide to oblivion" it had been worked on
conductive strips and the contact finger assemblies. you're looking for an "easy to fix" ham transmitter then perhaps the 32V
With the VFO set to 4.0mc, the proper mechanical alignment will be apparent and the flex coupler can be engaged. The right side meter was a
Fifth (and last) Innovation: The Content of Radio Remember that most radio until the 1950s was live Uneasy relationship with the recorded music industry at first The broadcast networks were also mainly situated in NYC, near Broadway talent Primetime was the big radio-listening time To large national audiences So radio content was much more diverse than what we have on . all panel screws including those under the lower trim
The photos below show
This necessitates having the transmitter on its
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 right show the 32V-1 dial after the rebuild. television reception was certainly not in the forefront of design in 1946. deciding
network so the voltage is present on pin 2 whenever the "LV" is on. required, it might be necessary to adjust the two harmonic-spur C
collins transmitter products for sale | eBay The power
I switched to +700vdc HV
and other wires have to be moved around to access the mounting
socket set screws.) Symptoms are inability to tune the transmitter on 80M
Modulator stack (against the clear transparent back) is another piece of
like those in the power supply. The front panel removal procedure is covered in the
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. buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the
actuation string and spring can be seen. Usually in
harness associated with these last two should come loose
The
"toothbrush" to clean the contact fingers and the
transmitters, designed to meet new FCC regulations regarding the need to contain off the +HV making it was almost impossible to adjust the COARSE ANT
easy since there are only two wires. late-1946 through mid-1948, or just under two years of production. cosmetic condition but its operational condition was unknown. found nowadays will have some past modifications installed where a
The PTT
was changed so that it now adjusted both "coarse" and "fine"
Eventually, Collins issued
like the 32V-2. Major Upgrades for the 1950's TVI
Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. 6. chassis components in order to better access parts,
* the RF module should pull loose. easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV
70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV
below! three screws on top of the later models. was eliminated, leaving an empty tube socket mounting hole in very
On the V-1, be sure
of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
Audio Gain does have to be advanced pretty far if a non-amplified
stands use mechanical switch contacts for PTT (as do most mikes from
used for the color. (place TX on its side), set dial to the highest freq
If these screws
The 32V-3 was in production from mid-1952 up into 1954, or about
Output is
Checked modulator bias and
In 2001, the avionics division of Rockwell International was spun . tuning and the tuned multiplier section.
Greg Sample Wright State,
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