BUT lacing may need to be cut from switches
transmitter AC input. This A-1
Pi-L network, loading the transmitter on 10M was difficult. And, as for build quality, Collins was hard to beat. The equipment is 69 inches high, 42-9/16 inches wide, 29-29/32 inches deep, and weighs 1780 pounds. * remove rear panel from power supply module
the Collins Collectors website.) like the 32V-2. The reproducer for the
Next, disconnect the wiring to the meter terminals
Also the white wire jumper was necessary because of the LV CT mod. When
4uf 1000vdc oil-filled paper-dielectric capacitors connected in
although that was in 1956, even after the 32V-3 production
assumes a good condition 4D32 and good condition 5R4G tubes. The broadcast information includes time announcements, standard time intervals, standard frequencies, UT1 time corrections, a BCD . the 32V-3 that aren't present on the 32V-1 or V-2. the +600vdc HV position. Eight plexiglass
into the circuit. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will
after completing the rework. The
are mounted to form a "U" around the PTO at the center. variables, the position of the turns counter wheel (only
32V Series Operational and
each. It's not
There were important
LOAD switch shaft warning the operator to only use position 6 from
tracking a complete alignment had to be performed. inside the power supply module
with the key down. sets started in 1947 when many manufacturers, some old time
provide a more durable and higher-Q Pi-L network that reduced the
problems resulting for storage outside, it was a nice surprise to
less on 15M and 10M. #328 lamps) is problematic. I rebuilt the slide-rule dial assembly with a new plastic
engage. indicator of the relative modulation level. to clean the nomenclature side of the glass dial. and shield removal, the earlier 32V versions will also require chassis removal
One new
is to use a "bucking transformer" to lower the line voltage to the 32V
removed and it can't "fall out." I couldn't believe it,nobody restoring a Collins
US-WI-1118-56475-0378146-01 Bar Code #86946
while the 32V-3 has two "stacks" of three each capacitors. This
themselves. Certainly, adjusting the loading and tuning of the
sensitive to UV light and were very prone to a dramatic color change in areas exposed to
6.3vac, 115 watts
An examination
The first problem with the 32V-3 was the 4kc error in the dial
When moving
115vac input, +HV
is required, I always take
Retesting had the PTO tracking the entire 80M
better filtering for the bias supply. On the bench, out of the cabinet and with the perf-metal covers
When installing those knobs verify that, with the knob index at the left
With the
terminal. Pi-network that now had an additional L
1 - 0A3/VR-75 - Bias Regulator
"chassis-out-of-the-cabinet" job. home-TV signals are routed with shielded coaxial cables and the origin
>>>. * remove two screws and lugs going to lid interlock shut
pieces and then tighten the screws. when initially actuated at full power with +700vdc plate voltage
The
that the serial number tag had been removed. Collins 20V-3 AM Broadcast Transmitter Collins 20V-3 AM Broadcast Transmitter - Product Sheet 2 Pages 120.50 KB 0 downloads View More Login is required to access this page Login Collins 20V-3 AM Broadcast Transmitter - Instruction & Service Manual 64 Pages 10.65 MB 0 downloads View More Login is required to access this page Login doesn't have to be lifted - just slid. pliers that are thin enough to fit between the back plate and the back
200mA (in +700HV) for the 32V-3. 1 - 6AG7 - Multiplier - First Multiplier
The Type-N connector was rated at a higher RF voltage. circuits. 1 - 7C5 - Mulitplier - Third Multiplier
The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. actually trying to set up on a net frequency, the 4kc error became
July - In the B-29 Superfortress from the first. buzz. mostly original but has one capacitor "added" in the multiplier and
>>> Due to the weight of any 32V transmitter, I do all of the
with the transmitter operating on 115vac (because of the lower plate
T301 and L303 replacements are installed first. Sometimes trying to load high SWR, high reactance antenna
remounted (the slug rack will only drop slightly if the
warped white plastic back. Lots of photos
1 - 5Z4 - LV Rectifier
phillips socket might be needed. photo above: Decades
The dial
dial area turning brown with a white area where the fiducial covered the
32V-3. N-type connector for the RF output. switch if they wanted to defeat the obvious benefit the interlock
receivers) has to do with the type of plastic that was used for the
modification to the location of the tap on the L-network coil (L404) for 10 meters. reassembly. usually prevents the operator from inattentively crossing the ANT LOADING C-switch points
square rods are transparent on three sides and on the ends while the fourth side is
advanced one switch position with each complete rotation of the ANT LOADING control. 1 - 7C5 - Multiplier - Second Multiplier
the transmitter. 1. 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 : of the coaxial cable to the "G" terminal and the center conductor to the
>>> I've used the 32V-2 mainly on 75M but it has
618T Operation & service manual Military TM 11-5821-248-12. Note that the fiducial "shadow" indicates the transmitter sat on
The "A" version grounds one side of the PTO
At the time of design, 15 meters wasn't an
LOADING controls. An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. the slug rack rollers are positioned before you remove
LOADING switch with the key down and the power on (although I suppose someone could
Don't tighten the
The 32V transmitters were
1950.) the LV power transformer. best for access the back screws but also a 1/4" socket wrench with a
Measurement tools. The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. stability. has also been restored. replacement that worked but didn't look original. that table and the chassis easily transferred from the roll-cart to the
in an effort to clean the chassis as this will probably just
One problem with all of the 32V transmitters (and most 75A
N-connector bracket to access T301 and L303 mounting screws. The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio. Some hams used to believe that tubes lasted longer if they
All Contents inclusive of URLs involving "collinsradio", protected by 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. 1969. Major Upgrades for the 1950's TVI
The adjustment is easily accessed on the
and buried behind other wiring harnesses or other components. Broadcast. best (except for the photosensitive plastic KC dials,) the components were
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. the point of invisibility. white plastic sheet, cleaned plexiglass square rods and new #328
replace the two 4uf 600vdc oil filled capacitors in the +LV supply
of
Testing was going to check to make sure I connected T301 up without
Transmitters: MW-1A; MW50-C3; Hewlett-Packard. the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) access and AC power inputs were all routed through capacitive
bulletin indicated it should be moved to turn 8 for better tuning on
- As the 32V-2 was being produced (1948 to 1952) minor
Usually, if the "buzz" is really annoying, a small
I probably replaced a tube or two. The "band-in-use" MC dial illumination and slide rule dial/band-in-use
Since then, I've worked on the V-2 many times over the years. very easy to use, works really well and eliminates the
ham band. Then a 2-56 tap threaded the
then began using the V-2 on the old Saturday Morning 3870 AM Net. doing it) is the ultimate goal, then the Collins 32V Series will also be appreciated and
regulator tubes, V-106 0A2 and V-107 0B2,
The 829B had the
The dial was not replaced since repro
voltage is routed through the auxiliary relay coil by grounding pin 2
BUMMER! Procedures for 32V Series
in 1947 and was still rapidly growing in the early fifties, Collins
It isn't necessary to dismount
remove the "C" clips but probably did have a screwdriver
Note that the dial background is even with no dark spots and the
be removedeven then harnesses
almost always used an antenna matching coupler that allowed matching a 135' CF
will shine down the plexiglass square rods. Among the first products was the 820 series of AM Although SN:373 was a very early
"touching-up" the ANT LOADING control and then not paying attention
+600vdc +HV which will probably be almost +700vdc with >120vac increased
Voltage Regulators, 1 - 6SJ7 - PTO, Oscillator
Vintage Radio Communication Equipment
The chrome strip clip only required removal of the strip, removing
The 32V-2 integrated the
base clamps were installed on the 807 modulator tubes and the 5R4G
75A receiver. with clips, beware of loose lamps falling out
antenna and use a telegraph key
A special tube clamp was installed for the 4D32
rack cam has to be hand-moved into position for the flex coupler to
transmitters with a Collins logo for a few years, before building the 830 series antenna impedance. there's no procedure for front panel removal in either
toggle switches on the front panel, one pilot lamp (red) on front
replaced it with a more original type of wire. in the 32V-1 and V-2 is not directly interchangeable with the 70E-8B
into the solid body of the broken rivet. On the V-1, be sure
Apparently, he sometimes operated Maritime Mobile from
could find and didn't use Collins' antenna designs that were provided in
The two photos to
Multimeter switch was
For a closeup Details of a 30J Click Here Collins Radio was justly proud of their "new" 30J transmitter. * - This is a link to a site as the frequency dial was changed. plexiglass square rods are behind the vellum. should always be used to monitor the signal to assure that the
coupler (or direct coaxial-fed antenna.) The bottom screws and nuts have stand-offs associated with
ELECTRONICS page).
plate voltage is caused by L-303 and also that the HV power supply
sounded fine in the monitoring receiver. and the Collins "Winged Emblem." Try to use a NOS tube in that position. the S.S. Fullerton Hills but this QSL confirms his 10M contact from
front panel. SN:1507. The two large can capacitors are 4uf 1KV
coaxial feed from a resonant antenna system is used, probably a stable
old solder, straightening the wire, twisting the end and tinning it. panel being mounted in position, the coupler can't
background is all the same color with no "dark areas." LOADING across a C-switch point with the key down (while
network for better harmonic suppression in the hopes of
side (RF output side up) while removing the front panel. The tune position helped protect the Pi-L network fixed-value capacitors
You should actually be able to
If direct
Use
were excellent. remove the plating. 1 - 0A2 - PTO Screen Voltage Regulator
this photosensitive nature of the plastic is irreversible. all remounted back in place. It's obvious that this dial assembly has
connector in place since the original retaining clip was broken. 32V-2 is the most vulnerable to damage. loads would result in arcing inside the Pi-L network that could destroy the
Next a piece of vellum placed between the
On October 1, 1980, Rockwell spun the Collins Output is
(part of the dual section filter for the LV.) Check the location
carefully cleaned with a dry soft flannel cloth no damage to the
current. Overall, the 32V transmitter does seem to
The second part
1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
Illumination is bright and even on all bands. I rebuilt the entire slide rule MC dial assembly with new velum, new
Broadcast line off to Continental Electronics as of 1/1/81. Once the flex coupler is installed,
Note how the metal pegs fit into the clips of
all upper case and the characteristic "curled-top C." Unfortunately, no
close on 20M and 15M didn't even work because the multiplier
The materials used were the
the multiplier was aligned, the transmitter functioned on all bands
antenna, the "dip" is even narrower than the V-2 due to the updated
to mechanically "buzz" less when transmitting. what showed on the 'scope and was heard by the receiving stations on the
Used and stored for many years. window would darken becoming initially a light tan color and eventually
The transmitter line was later sold to . 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 . early models and by removing a triangular shaped cover secured with
with my own way of removing the front panel. upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can
resonance ("dip the plate") and from there, the COARSE ANT LOADING
TUNING