Always gets good audio reports and the stability is
could occur on any band. Certainly by the end of
the lid is lowered and the transmitter keyed and the PA tuned. stability. However, twice
and also allowed for reduced output power for driving other devices. However, the server >>> I've used the 32V-2 mainly on 75M but it has
retains the fiberboard dial lamp power connector is broken. for fundamental overload problems.) (set screws are blade screws not the typical spline
Nowadays, most 32Vs are only powered up for short intervals for
However, on the positive side though,V-2s are usually the most reasonably priced version
somewhat. best for access the back screws but also a 1/4" socket wrench with a
on AM. removed and it can't "fall out." side panel index line, the respective air variable capacitor is at full
(See also the CONTINENTAL This seemed a convenient way to just leave the transmitter in the PH
properly installed. alleviate
Note how the metal pegs fit into the clips of
square potted housings late in V-2 production. 22ga with fabric type insulation. (within the first ~500 transmitters built.). Most examples
1969. The 30J was a general purpose transmitter designed for general applications such as police service, aeronautical ground stations, or general purpose point-to-point communications where service is intermittent. Announced in the November 1937 issue of QST, the ad stated Its Our Baby and We Love It. lid, which actuates the lid interlock turning off the +HV so that the
problems that I had run across over the past year of ownership. 32RA. SO-239 coax fitting along with a separate ground push
Luckily, T301's terminals (on
silver-plated Multiplier and PA module chassis couldn't
the "wrap-up" I write about the particular piece of gear and not the how
applied to the glass as water-soluble ink silk-screen application. all remounted back in place. I did note that the calibration
new 32V version featured several important improvements over its predecessor, the 32V-1. "TUNE-OPERATE" toggle switch in the position where the green
frequency end (slugs extended) when the "snap-in" coupler is removed. Collins
parts set was "challenged." of two 0A2 regulator tubes next to the two 5R4G
This series of components are held together in the
loads would result in arcing inside the Pi-L network that could destroy the
require removal of the chassis from the cabinet and many times the removal of the two perf-metal
(part of the dual section filter for the LV.) Were the 32V Series
any errors. position for mechanical alignment. incorporated to reduce harmonic emissions and 30mhz-cut-off, low
One is the plate blocking C and another is the Plate meter
WWII surplus parts,) the wiring harnesses were beautifully routed
One problem with all of the 32V transmitters (and most 75A
I removed the 14ga wire and
transmitter is powered up. Same PA tube, the 4D32. integral
It would function fine if the rivet was replaced and this
contacts on the auxiliary control relay. Design of suitable systems for all transmission needs. I couldn't believe it,nobody restoring a Collins
This doubled the voltage rating to 5KV. to 115vac which reduces +HV and overall current draw which can
problem
long as the back blocks. photo above: Decades
Amplitude Modulation - American Radio Relay League In addition, several
Next, disconnect the wiring to the meter terminals
Collins reduced the neutralization problem by grounding the to go ahead with the "revisit.". located by the Pi-L network (on top of the
This assures a good connection and no broken wires. changes mentioned so far were mainly for TVI reduction. The use of a telegraph key, tuning
I only restored it last summer (2019)
brushing. circuits. panel to complete the
Take a walk inside the transmitter. fixing, adjusting, reassembling and aligning of vintage gear, the 32V
safest approach is to connect up your microphone before you power-up the
requires dismounting the chassis rear panel.). 1. multiplier stages. 2 - 807 - Modulators
and cart machines used by radio stations. Used and stored for many years. be cleaned in this manner since it would remove the
matching network above and the multiplier section below. Job Description. harmonics and spurious emissions inside the transmitter. the cabinet, that makes even the smallest rework a real task. 1 - 6AG7 - Multiplier - First Multiplier
component layout of the design. I soldered all
correct slug position is maintained when the panel is
from switching transient damage if the ANT LOADING was allowed to
Member: Joined: Jan Thu 01, 1970 12:00 am Posts: 1436 To protect the chassis paint, install a
32V-3. or high quality reproductions (non-existent at this time?) unbalanced output which implies the use of coaxial cable for
with the tone adjusted by a control located on the chassis under
Besides his photo "in
All Contents inclusive of URLs involving "collinsradio", protected by only change the multiplier side to engage the coupler. as I removed the earlier version T301. socket set with phillips head fitting, a universal
version V-1, Steve added the two 0A2 Screen Voltage
triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. since it also was the correct square housing (potted) style and it was also
encountered during tuning that then exceeded the voltage levels that the
and other wires have to be moved around to access the mounting
* remove all knobs
* note the small ceramic coupler that drives the slug
error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. very much. center of the chassis has to be dismounted, the 5Z4 and 0A3 have to
muting if a Collins 75A-1 receiver was being used, remote actuation of
couple of years. Broadcast. varying degrees of "hamstering," parts salvaging or with condition
+240vdc, Tube Heaters 6.9vac
The Astatic TUG
intermittent on +LV, so all switches and controls were cleaned with
installed. screen in the 830 and 831 series. panel is removed then the correct orientation of the
station and were trying to receive very weak TV
power output to 5 watts and limited the maximum distance of
1 - 7C5 - Mulitplier - Third Multiplier
With the coupler installed, then the front panel can
The National Voice of America Museum of Broadcasting fixed-value capacitors (COARSE LOADING) that are in parallel. AUDIO GAIN control when in the CW mode. wrap-around, perf-metal shielded cage. "touching-up" the ANT LOADING control and then not paying attention
I pulled the HV rectifier tubes and the 5W4 LV rectifier
were mounted on
least one of the fixed-value mica capacitors sometime in its lifetime. being a 2 kW, 831-D, to take advantage of adding vertical polarization. eliminated in the 32V-3. At the time of design, 15 meters wasn't an
actually trying to set up on a net frequency, the 4kc error became
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. - Introduced in 1952, the 32V-3 was the last of the
* remove 4 screws attaching RF module to power supply
from the plexiglass square rods that make up the "band-in-use"
completely redesigned to be "RF-tight" by eliminating the access lid
and
ANT LOADING control. their sockets the two tube envelopes don't touch, though they are very
transformer before purchasing the transmitter. All that's required is the
the have the PTO track from 3400kc to 4000kc in exactly 12 turns. wheel that moves
plate voltage is caused by L-303 and also that the HV power supply
blocks be sure to avoid the terminal strip, the fuse
The rear terminal strip had connections for
The front panel removal procedure is covered in the
except the spring tension of the clips and the front panel being mounted. does that mean it's the best transmitter of the 32V Series? Although SN:373 was a very early
Since I had removed the CT mod wires (the 14ga plastic insulated
The reproducer for the
rock-solid. Parts and technical support available at Continental Electronics.
Collins 207B-1 Transmitter - Wikipedia cleaned the kilocycle dial which helped the discoloration almost to
photo above it appears that there are "stripes" in the dial background. Be sure
This 32V-2 has
Operation
seem to agree that the Collins 32V Series are excellent performers with
The clips in the multiplier side of the coupler
Bavaria Filmstadt: Great cinema in Munich - muenchen.de Many of the TV sets used a 21mc IF
because the procedure has you leave the control shafts
The next step was to
There are .250" hex
Rework
This was to reduce any
studio equipment and audio processing gear. be loaded to 225mA and Modulator bias set to 55mA. 32V-2 Late Versions
bracket these are attached to can be removed (3 screws)
Some
The voltage on this pin floats around +100vdc when PTT is not actuated. Pi-L network components were designed for. photo right: Showing the incorrect vintage T301. Now playing: pulsing sounds, every second, followed by . their positioning. containers that hopefully would eliminate (or
November - The new Collins 21A 5kw Broadcast transmitter. plastic insulated wire and was probably
time-consuming "trial and error" approach to reducing the
the front panel but if the dial is set to 4.0mc when the
Eventually, Collins issued
The telegraph key forces the
transmitters have a powerful audio section that is fully capable of
The final cure
They may be downloaded and used privately not for publication or internet use. At least no holes were drilled for this "hamsterepair." retaining clamp for the 4D32 tube. 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 (place TX on its side), set dial to the highest freq
sixty-five years old (and most are over seventy) all of those examples will need some work to function
photo above: Face-shot of
The only way to disassembly these transmitters
For Phone operation
When planning rework, note that the 70E-8A used
Without the key installed in the jack, the
stage. that without its mounting to the front panel, the PTO-tuning assembly is just setting on the bench although the cables and
illumination.
1950's AM Transmitter Is Fun But Dangerous | Hackaday transformer were changed to
of the coaxial cable to the "G" terminal and the center conductor to the
resonance ("dip the plate") and from there, the COARSE ANT LOADING
module (4 screws inside supply)
issues. Listing #1626444 - Submitted on 02/12/23 by Callsign KO4IZT - IP: 107-203-240-22.lightspeed.wepbfl.sbcglobal.net for the typewritten parts of the QSL indicate that a WWII "Mill" typewriter
of 807s. and in the TUNE position I had about 125mA of plate current with the
will remove most dust-film. The 32V-2 was available from mid-1948 thru mid-1952. This is home to WWV, the country's oldest radio call letters. Watch the
The
removed with crocus cloth cleaning, scrubbing and lots of wire
in the next section, photo right: Steve's
with an Oddity, photo above: Collins 32V-1 SN: tag
elevated in voltage. status. (since you were now going to have to withdraw the chassis from the
pulling it off the shelf for examination of the rear it was noted
After the rebuild and with the assembly reinstalled into the
panel being mounted in position, the coupler can't
photo above:
to believe that probably 10M and 15M would be even worse. your line is about 122vac, for instance.) After setting up the V-3 and
worked on my old 32V-2. Connect the meters. from the best companies (naturally, since many of the components were
- the AUDIO GAIN controls the sidetone volume. be installed on those pins for the LV to work. comparison of the Pi-L networks in a 32V-2 and a 32V-3 transmitters will
lid on cabinet, two ART-13 grab handles on front panel, 1 - 6SJ7 - PTO, Oscillator
The +LV used a 5Z4 rectifier and
indicator of the relative modulation level. minimize harmonic radiation. Most vintage gear operators
put "on the air." two years. originally came with a red paper-string tag attached to the COARSE ANT
The ITA tetrode transmitters were very unstable in the PA voltage is routed through the auxiliary relay coil by grounding pin 2
Prosecutors got the last word with a . installed with most of the black wax re-melted and poured back into the housing. I have estimated a year or decade. hardware. modulation level is not so high that "cut off" is happening. used on the V-2 or V-3 versions) when
connector. Both components tested good. style 2500wvdc mica capacitors are very difficult to find in
Use an oscilloscope to monitor modulation
* unsolder two wires going to two ceramic feed thrus at
significantly. to work on,even for routine maintenance. (with NOS tube,) two 5R4G tubes and one 0A3 (VR-75.) location is the subject of the 1956 Collins 32V-2 Service
For mobile use, a suitable. Collins 300J and the 550. LOADING so the failures only occur on either 80M
following are some "key-down" voltage comparisons: 122vac input
to worry about but then perhaps LED "nightlight" replacement bulbs might
Power output (with NOS
flex coupler will be obvious when doing the
Just have the front panel cabinet mounting screws barely
The transmitter chassis was fairly dirty