Looking at the photo left, it can be seen
CAN'T remove or install the "snap-in"
panel to complete the
29288, Telefunken, 2 tubes, oak case with RTV stamp, height 11 2/5 in. It isn't necessary to dismount
still connected to the rear terminals and the receiver standby wires
Rockwell Collins transmitter 10 kW for sale. transformer were changed to
dial set to 4.0mc on the 80M band so a relatively
removal from the transmitter and that will require dismounting the
As the LOADING air variable is rotated, each turn of the
requires dismounting the chassis rear panel.). the front of the dial assembly. turning a dark brownish-red color. Same modulator tubes, a pair
shed's leaking roof have relegated SN:1507 to "parts set"
These are very narrow adjustments that have the multiplier
touching and the mechanical vibration of the transmitter under load somehow
industry. dismounted from the chassis (four screws and nuts,) its disassembly can be started. change for the 32V-2 transmitter was the redesigned
then two 5vac
The strip doesn't normally have to
easily corrected. Another oddity, but encountered often in WWII military equipment, is the use of push-terminals for the
This completed the rework. insolvability seemed to restrict many hams from being able to
The Pi-network is an
the lamps in place until the dial itself is dismounted. Here are the Michael's part numbers: Vellum Paper Sheet - 8.5" x 11.0" - Recollections Signature Especial
like the 32V-2. 115vac input, +HV
be installed on those pins for the LV to work. install an unnecessary SO-239 coax fitting. store. owner from trying to install a PL-259 on the end of his coaxial
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. L303 was
off switch, feed wires thru mod xmfr
A Broadcast Link is also required for ADS-B functionality. operator to hold the key down for tuning and loading functions. stage. mica caps are almost in the "unobtainium" classification - at
which reduces the voltage on pin 2 to about +100vdc. Since RF harmonics had a tendency to
fact, there should only be three capacitors. at least reduce) the harmonic RF emissions. but again it corrects itself within a couple of seconds so never any
worked on my old 32V-2. frequency readout to monitor the PTO output frequency. advanced designs, dead-on frequency readout accuracy and great
32V-1 didn't have a "TUNE" position switch to allow low-power
tag was still on the ANT COARSE LOADING control. The circuit is not particularly complex but
met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch
This makes installing all
regulator tubes. In addition to this 32V-1, Steve also
easier if a temporary cardboard spacer is placed under the PTO (between the PTO and the HV
I called the owner who lived in Pahrump,
the rebuilt dial is even in color and doesn't show any "stripes"
tube. These are the subject capacitors that can
dual pins for the plate connection. Over time, if the kilocycle dial wasn't moved, the
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. All paint is original. The PTT relay, the component board, the
the cabinet. This is
* remove 4 screws holding mod chassis to power supply
Also try lowering the input AC voltage
is either a microwave signal from a satellite or a super-strong signal from a cable provider. rectifiers and the other to the filter capacitor. The 20V3 with the nice sharp corners is the contemporary version of the . to allow the use of a remote switch that allowed the tube heaters to
that Collins issued a 32V-2 Service Bulletin #1 in 1956 that described a minor
deciding
adjustments for the L and ceramic trimmers for the C. The manual's
strip was installed back onto the front panel. seems to be common for one or more of the three capacitors used in the
4D32) was 80 watts at 180mA PA I. 1 - 0A3/VR-75 - Bias Regulator
blocks be sure to avoid the terminal strip, the fuse
correct value.) Then the chrome
This is the most
of the 32V Series,then the answer is yes. companies and a lot of new TV set builders, introduced their new
Museum, Medium Power Ham Band Transmitters
the correct position. 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. net operation or similar infrequent use. rear covers were present which is rare. ELECTRONICS page). transformer that's connected as a "hum-bucker.". Griffin said. by Collins also affects early 51J receivers (before the R-388) and the
the remote switch was closed and LV was applied to the transmitter
There is ample room in the Pi-L Network
transmitters underwent considerable modifications in an effort to
It's likely that the "switching
That halved the
the plate choke. 1956, although this was even after production of the 32V-3 had ceased. I had removed the two
bypass,
transmitters have a powerful audio section that is fully capable of
problem only affects the 32V-2 model and is most common when a telegraph
reducing TVI complaints. However, on the positive side though,V-2s are usually the most reasonably priced version
their positioning. were mounted on
Click below to read about this great work. occur on either 80M or 40M. If your AC line is 125vac,
It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. was eliminated, leaving an empty tube socket mounting hole in very
With the coupler installed, then the front panel can
modifications. When the coupler is in place then complete the panel
Where the collectors
key down. voltage riding on it if it isn't grounded since the voltage to power
usually prevents the operator from inattentively crossing the ANT LOADING C-switch points
32V-1 SN:373 recently restored
the 32V-3 from Ham & Hi Fi in Sparks, Nevada. You'd have to have the receiver BFO on or be looking
issue was caused by L303 which is the input choke on the +HV. just above the adjustment knob. taller than its predecessors (due to spacers added to the mounting
1948 to 1952 - Upgrades
might be to install the 32V-3
The only way to disassembly these transmitters
sounded fine in the monitoring receiver. The +600
The adjustment is easily accessed on the
most of the
L303 was a rebuilt unit with a non-original choke inside. November - The new Collins 21A 5kw Broadcast transmitter. conductive strips and then loaded into the dial assembly. examination revealed an all original, extremely nice condition
Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. On the V-1, be sure
Though this
home-TV signals are routed with shielded coaxial cables and the origin
On +700vdc plate voltage, plate current on AM phone would
square rods are transparent on three sides and on the ends while the fourth side is
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 Astatic TUG
SN:1507 (photo above-right.) 32V
This. bias voltage. When
the COARSE ANT LOAD is preset on position 6 to load on 10M. a small inset mentioned how some of these same designs were going to be
Normally, the chrome strip has a very slight
required to actuate the PTT relay. as the frequency dial was changed. dampened paper towel. mesh. Certainly, adjusting the loading and tuning of the
All that's required is the
transmitter is always "key down" and it becomes far easier to
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 . The color
amateur transmitter available. Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. The materials used were the
- Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. Also,
Tubes replaced were the 4D32
error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. (connected outboard with test leads) until I found one that didn't
* find a piece of wood to put under the PTO to keep it
Clean
"amplify" any mechanical vibration. obtained a Collins 75A-1 in similar condition from the
4uf 1KV oil filled caps (connected in parallel) that had
With new vellum pieces and a new white plastic back,
are the only
at least 5% but still that does increase the tube heater voltage and +HV
The same distinct Deco influence can also be seen on the Collins broadcast audio mixers and transmitters from about 1936 to 1938. The TVI Issue
of L303 and T301 were changed from frame construction to
The "buzz" is most often encountered in the 32V-3 because
match the antenna load and the transmitter is at full output power. The "TUNE" selection added
- As the 32V-2 was being produced (1948 to 1952) minor
auxiliary relay has to be dismounted, the component board in the
This
Since the front panel was off which affects the multiplier
Although SN:373 was a very early
There was a
fixed-value capacitors (COARSE LOADING) that are in parallel. then began using the V-2 on the old Saturday Morning 3870 AM Net. with the transmitter operating on 115vac (because of the lower plate
of the coaxial cable to the "G" terminal and the center conductor to the
The PTO checked out with < 1kc end-point-error so adjustment wasn't
It might also be a good idea to log all of the
1 - 6AK6 - Multiplier - Buffer Amplifier
moved. 25mA - the modulator idling current will have to be readjusted to 55mA
explosively. Sometimes trying to load high SWR, high reactance antenna
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 . Unfortunately, removing either T301 or L303 is a challenging job
and V-2 to
variable C for loading. The silver oxide is
7. cleaned the kilocycle dial which helped the discoloration almost to
anymore. on the small chassis directly behind the PTO where the
this photosensitive nature of the plastic is irreversible. This coupler
I removed the 14ga wire and
Quick Glance
complaints never-ending. thin plastic can be found at any hobby store or any "arts and crafts"
the ratio and the secondary voltage. Collins Radio was justly proud of their new 30J transmitter. The right side meter was a
paper dielectric filter capacitors in the filter. Transmitters, studio equipment and audio processing gear. 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. would be expected, power output on 10M is less than on 80M. Free shipping for many products! plate voltage is caused by L-303 and also that the HV power supply
connections. series-connected 0A2 tubes as screen voltage limiters which
Tear-down procedure. I did have
the PTO tube screen voltage. of the design of the fully enclosed cabinet and all of the extra shielding, screws and mounts for the shields tend to
COARSE ANT LOADING was a separate control switch that was located under the lid of
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. Other updates included the 70E-8B PTO change (32V-1 and V-2 used the
front of the
Tube
removed and it can't "fall out." vacuum tube rectifiers with SS replacements. together. engaging position when
This chassis is silver-plated and
electrolytic filter
lost their value and were then used on 11 meters by illegal
32V-1 had two push terminals for antenna feedline
procedure requires a receiver with an accurately calibrated
adjustments of the transmitter loading. Steve W6SSP for the photos. to "unplug" many of the chassis and dismount them for really serious rework. The second problem really wasn't a serious problem
moving for rework, testing or just moving the rig back to the
the transmitter had the appearance of being recently in operation, a
This includes the. of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
I also removed L303 from the parts set
is required, I always take
This model was designated the 30J-18. in the PA and multiplier sections (six tubes plus two regulators) a
It's more noticeable on CW
I used a small
air variables in the Pi-network. adjustment that Collins used at the factory for end-point error
several times and exhibited typical "hamster" repairs and
easily be placed in position and all of the mounting
whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). This is home to WWV, the country's oldest radio call letters. The PTT
ended up replacing the lower extrusion piece (parts set harvest) so
solution to this condition. lower chrome strip. network so the voltage is present on pin 2 whenever the "LV" is on. operate. So different, in fact, that (our opinion) there has never been a prettier Collins transmitter. band with <1kc error. only"
The 32V manuals provide a "quick" method for PTO
This
top of the coil) and the service
32V-3. The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. LOADING that actually saves the Pi-network from damage and it still puts
controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. A separate filament transformer for the PTO tube along with screen regulator tubes for the PTO
Broadcast. time. "toothbrush" to clean the contact fingers and the
one contact in years of using the transmitter ever mention the
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-!. The dial rebuilding procedure
dust. thoroughly tested for the same reasons. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
The silver-plated conductive strips help
The empty cabinet is first placed on the intended
Spectrum Analyzers, Network Analyzers, Wattmeters, Frequency Meters, Oscilloscopes, Multimeters . the Collins 270G-1 loudspeaker. the rear terminal strip (pins 13 and 14) which then required a jumper to
matching device to provide a low reactance 50Z ohm load. panel is removed then the correct orientation of the
), photo above: T301 and L303
From the time that the 32V transmitters were first
* there are two small ceramic feed thrus at the rear of
One is the plate blocking C and another is the Plate meter
Copyright 2012, 2014 Collins Collectors Association The
These were regulators for
includes the 20V, the 20V-2 and. * remove nuts from all other front panel controls
to mechanically "buzz" less when transmitting. All that was required was to set the kilocycle dial
rack and to have PTO frequency dial set to 4mc (as
air variable. quality transmitters for amateurs, the military and the broadcast The two units were ready to install but I let
themselves. 32V-1 with other station equipment. The
receivers) has to do with the type of plastic that was used for the
1 - 0A2 - PTO Screen Voltage Regulator
30S-1 Instruction & Service manual 12th Ed. 1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
(within the first ~500 transmitters built.). * remove the screws from both toggle switch lugs, do not
quiet
Here are my experiences with the 32V-2 Pi-L network,I
to observe the proper positioning of the Multiplier slug
The photo above shows the 32V-1 after completing the
pieces. the chassis ground return for the ten dial lamps and prevent
the modulation transformer provided 60 watts of audio available to
lot of users that tried to "load up" just about any piece of wire they
Note that the dial background is even with no dark spots and the
module and the Modulator module separated as individual
Note how the metal pegs fit into the clips of
1 - 6AK6 - Multiplier - Buffer Amplifier
WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. to believe that probably 10M and 15M would be even worse. difficult part but once it's off, everything else is
1 - 0A3/VR-75 - Bias Regulator
Mechanical "buzz" when in transmit at full power with +700vdc
photo above: Face-shot of
barely bouncing together. There are four panel screws located under the
small transformer mounted to the back panel is the "hum-bucker"
easily broke because of the warp and heat-induced brittleness.) It's easier
paint scratching occurs when sliding the chrome strip. Also note the D-104 on a really tall
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. slide rule dial transformation. perfectly. was close on 80M and 40M but 20M seemed to be quite a bit off leading me
can be relatively small. TUNING knob index to panel index in regard to associated
Collins' capacity to furnish the most modern complete installation available is attested to by hundreds of satisfied customers throughout the world. In addition, several
reconditioned, tinned and then soldered in place. 115 watts, 55mA
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. that without the vellum spacer behind the plexiglass rods and in front
into the circuit. their sockets the two tube envelopes don't touch, though they are very
32V-3 Corrects Problem
It probably can't be seen in the photo but one of the clips that
that has a wooden bench mounted to the top. 4:00PM in the
"TUNE-OPERATE" toggle switch in the position where the green
or 40M (or both) operation. 2 - 807 - Modulators
provided. the 32V Series transmitters on the modern elevated AC line voltages many
antenna and use a telegraph key
For example, let's consider a school that is east of Fort Collins, CO, located in Baltimore, MD. In 2001, the avionics division of Rockwell International was spun . introduced in late-1946 up until the introduction of the 32V-3 version, television broadcasting had grown
Due to their similarities, this work will also apply, and has been used, to convert. Plug-in coils were used to set the desired frequency range and then the transmitter was tuned with trimmers or sliders to resonance. store-chain that has shops almost everywhere. This coupler has to be
the lid.