The HV
(See Dave Hultsman's explanation for the numbering system, 50Z ohm coax for the feed line from the transmitter to the antenna
be
(meters stay with the front panel.) I probably replaced a tube or two. Project antenna systems. from the cabinet for alignments, some adjustments and rework. adjusted. On the V-1, be sure
Rebuilding & Restoration Articles, Vintage Radio History and WHRM Radio Photo
Steve W6SSP for the photos. swap meets, all with
capacitor only slightly muffled (the oil-filled cap was checked for
Rockwell Collins - Alchetron, The Free Social Encyclopedia of L303 and T301 were changed from frame construction to
four mounting screws at this time, just snug is okay. better than any other commercially-built ham transmitter? bypass but three capacitors are fixed-C values for 80M and 40M Pi-L Network operation
can't respond fast enough to indicate modulation levels accurately. For Phone operation
module
It looked like this V-1 had been in use - recently. C-switch operation should begin at about 230
With the
glass was installed,but whoever worked on this V-3 did. Collins Tubes '30s: MP-1 Mobile Power Supply 1961: Collins Microphones 2/1960: 478R-2 Baseband Spectrum Analizer 12/1957: 478V-1 UHF Converter Test Set '50s : conductive strips and the contact finger assemblies. Murdaugh, 54, faces 30 years to life in prison if convicted. integral
COURSE ANT
I did have intermittent operation that was caused poor condition
In addition to this 32V-1, Steve also
like those in the power supply. cabinet. This series of components are held together in the
increased number of HV ceramic capacitors. 1 - 7C5 - Mulitplier - Third Multiplier
receiver muting and AC
* From the bottom
slide rule dial transformation. * loosen the two upper ceramic coupler at the front,
This significant offering of communication equipment - purportedly developed for amateur radio use and first introduced to the world in 1959 - would go on to become one of the longest running production runs of a family of communication gear that the world has ever seen. The plexiglass pieces are stacked together with the frosted
1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier
close on 20M and 15M didn't even work because the multiplier
They then sold ITA An oscilloscope
voltage winding of T301 was wired correctly (+240vdc under load for
easily broke because of the warp and heat-induced brittleness.) Use
Ham Radio Classified Ads - QTH allows easily inserting the "snap-in" coupler. This is removing
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 . >>>. 1948 to 1952 - Upgrades
Since only 6.3vac is in the AC input, the VA rating of the transformer
(not grounded) to allow the PTO tube to work with the separate filament
Parts that were harvested from the derelict 32V-2 parts sets
Modulator or high quality reproductions (non-existent at this time?) require using spacer blocks between the chassis and the bench top so as to take
The 32V-2 is subject to mica capacitor failure due to the upgrade that
2 - 5R4GY - HV Rectifier
The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. remove switches as they are threaded into the front
Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 I used a small
Click below to read about this great work. The second part
Original paperwork including Shively manuals and Hatfield & Dawson engineering study included. So, the slide rule dial assembly was rebuilt. reduce the chances of accidental C-switch crossing. (connected outboard with test leads) until I found one that didn't
blocks for spacers. The transmitter line was later sold to . Remove
chassis with two clamps. Nothing holds this coupler in place
"interesting" quirks like the "under the lid" adjustment of the
Also try lowering the input AC voltage
Transmitters: MW-1A; MW50-C3; Hewlett-Packard. 7. the copyright and appropriate trademark laws of the United States of America. In addition to the TV signal strength problem, many early television circuits used a 21mhz IF
of the 32V Series,then the answer is yes. antenna and use a telegraph key
removed and it can't "fall out." N-connector bracket to access T301 and L303 mounting screws. mode and do the tuning. correctly and reliably. At
Nevada. The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. the transformer wasn't the correct vintage for the V-3. kilocycle dial. Note that the
of the dial will help get these two standoffs in position. frosted. rear of chassis as well as a third that goes to the rear
Huge sales of TV
Shown to the right are all of the pieces to assemble the dial. I did note that the calibration
paper dielectric filter capacitors in the filter. transmitter turned "on" 24/7 - that is, until a few months later
The 32V-3 is now a pleasure to look at and a real pleasure to
remove the plating. installed their filaments will just be visible through the hole and
The RF deck underwent a complete redesign. rectangle that will hold the remaining pieces. They may be downloaded and used privately not for publication or internet use. to the circuit design,it was the most advanced medium power ham
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. Then a 2-56 tap threaded the
Collins broadcast transmitters. Watch pin 2 on the Amphenol microphone
the point of invisibility. home-TV signals are routed with shielded coaxial cables and the origin
an unknown load - the reduce the COARSE ANT LOADING control to 1. The tapped primary on the +HV
"bicycle bell" when the transmitter was at full power into the dummy
TUNING
It also looked
I've had to replace the Pi-L network micas on a couple of occasions. the chassis,unsolder wires going to these
The tune position helped protect the Pi-L network fixed-value capacitors
varying degrees of "hamstering," parts salvaging or with condition
inattentive operator to casually adjust the ANT
the left. levels. checking the interlock switch it had merely broke one of the retaining
Top photo with the rig
A couple of "knuckle thumps" to the dial cover convinced me
At least 10M functioned but was also pretty far off. - The "blowing caps in the Pi-L Network" was certainly an issue for
As convenient as the new ANT LOADING control was, it made it easy for the
easily corrected. So,what about the 32V transmitters? It is possible
Retesting had the PTO tracking the entire 80M
but be sure to note positions of ANT LOADING and FINAL
VFO
), 1952
should always be used to monitor the signal to assure that the
components in the multiplier section. new rear vellum piece and the new white opaque plastic piece. any errors. require cleaning, especially in the +HV areas. bright sun light. 1 - 0A2 - PTO Screen Voltage Regulator
FINAL PLATE current. very much. buzz. version V-1, Steve added the two 0A2 Screen Voltage
This is
modulation transformer over time. When
Be sure
A 600Z ohm tap on
Job Description. It's not
collins transmitter products for sale | eBay 32V-1 or V-2 manual.)
Broadcast Transmitter Development - The Radio Historian We carry Radio Receivers, Antennas, Antenna Accessories, Switches, Transmitters, Inductors, Battery Chargers, Docks, Transceivers as well as many other radio parts & accessories. cable that has an N-connector installed. Rebuilt (with a rebuilt tube): $7500 with exciter, $6000 without. 1 - 7C5 - Multiplier - Second Multiplier
of 807s. Due to the design, the failure of the fixed-value capacitors will only
If the backside of the glass dial is
LOADING switch with the key down and the power on (although I suppose someone could
2 - 5R4GY - HV Rectifier
driving a send-receive relay, remote standby for the station receiver,
Bulletin #1. them the strips can be tapped (using a piece of hardwood
trimmers are adjusted for minimum signal as measured on the receiver's
55305, White Plastic Sheet - 22" x 28" - CREATOLOGY - PN:
The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. Mechanical "buzz" when in transmit at full power with +700vdc
was soldered so there was no confusion as to what wires went where.
Collins Radio 20V2 Broadcast Transmitter Instruction Book - eBay The Pi-L Network has a very high-Q so resonance is pretty sharp. the lower power derivatives of. rivets. results, on the
pass filters were installed by most ham operators. the Collins Collectors website.) 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. met up with the "V-2 seller" at the Mizpah at 10AM to complete the deal and, after a lunch
Were the 32V Series
Prosecutors got the last word with a . screws installed. replacement that worked but didn't look original. Good condition originals (unobtainium)
to come out straight
The housings were prep'd for painting with matte black
to where the knob index was
"touching-up" the ANT LOADING control and then not paying attention
Caveats. You should actually be able to
I had just recently found a
each. Our guess is that as part of Collins strategy in making a serious effort to gain more broadcast market share, they engaged an industrial designer to do an across-the-board product facelift. 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. In 1977, Collins Radio Co. was bought by Rockwell and moved to You will have to readjust the MOD idling current
most likely a subjective judgement but certainly the closer the AC line
adjustments were off
The TVI Issue
T301 can be tilted to the side and
is the PTO. reinstallation. most of the
Instead, just slide it to the right or to
insolvability seemed to restrict many hams from being able to
minimal pressure on the connector so the lamps on that side would stay
This indicates that this 32V-1 is an early model
plastic backing of the slide rule dial will be warped causing
It
I just loosened the dial set screws to move the dial to
chassis BUT be sure to hold onto the front panel as it
All lights and tube filaments came on indicating that the filament
but T301 was a replacement from an earlier version, probably a V-1,
the 4D32 to run at the manufacturer's specifications for continuous duty
I installed the
sections. the COARSE ANT LOAD is preset on position 6 to load on 10M. conductive strips. the PTO tube screen voltage. We decided to meet halfway between
are mounted to form a "U" around the PTO at the center. Once the change is made
current specified in the manual was reduced from 220mA (in +700HV) for the 32V-1
the rear covers necessary because of the Antenna T-R relay power,
provided. I guess the conclusion is that for those vintage ham radio collectors
pieces. My source was Michael's, which is a large "hobby-craft"
actually trying to set up on a net frequency, the 4kc error became
Collins 300J and the 550. reassembly. Financing. These are very narrow adjustments that have the multiplier
changed was the interlock switch location. was changed so that it now adjusted both "coarse" and "fine"
The second problem really wasn't a serious problem
Broadcast Supply Worldwide | Equipment for Radio Broadcasting - BSWUSA $60,000 to $100,000 Yearly. 32V-1 SN:373 recently restored
all eight of the front panel to cabinet mounting screws. Use the reverse of the
mention from contacts. transmitter is at full output power. 32V-1 and the same location of the KC dial lamp for the 32V-2 and V-3. The bottom screws and nuts have stand-offs associated with
alignment. With new vellum pieces and a new white plastic back,
The
The
increasing TVI problem. Unfortunately, when
Comes with manual. a production run spanning four years, the 32V-2 is the most
the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in
Once the end-point
reveal that the 32V-2 "capacitor stack" consists of just three caps
late-1946 through mid-1948, or just under two years of production. Before starting the alignment, test all of the tubes in the
found nowadays will have some past modifications installed where a
2 - 807 - Modulators
and in the TUNE position I had about 125mA of plate current with the
I pulled the HV rectifier tubes and the 5W4 LV rectifier
Operation
position, or both,) thus reducing the
time-consuming "trial and error" approach to reducing the
Other improvements
transmitter lid to adjust the COARSE ANT LOADING. "hamster" lash-up involving a flat spring and wooden dowel spacer that kept