This. Without a telegraph key inserted into the jack the transmitter
fixed-value mica capacitors (and perhaps the C-switch
Be
An easy thing to try is to loosen
Now, an original
rock-solid. Finally, I found a good condition
Collins Radio 250 kW Broadcast Transmitter The facility once boasted six of the most powerful radio transmitters on earth. controls and only slight, fine adjustments of the FINAL TUNING and ANT LOADING should be required. multiplier stages. The
of the wire connections to T301. problems resulting for storage outside, it was a nice surprise to
one contact in years of using the transmitter ever mention the
screw threads and they'll screw in easily.) dummy load was connected and the 32V-1 powered up. with two 220pf at 5000wvdc and one 470pf at 5000wvdc. will be always be "key down." This allows easy
Design for low inductance and capacitive interaction with the plug-in tank coils, the entire frame was constructed from cast aluminum. Of
wire) connecting the LV fuse to the AC line input. It's easier
series pairs that increased the working voltage to 5000vdc. 32V-1 you can tilt the PTO-tuning assembly somewhat forward to have the screw heads in
placed under the PTO to prop it up into position which
Ham Radio Museum; Collins Transmitters; Collins 32V-1 Modes: AM/CW Bands: 80 - 10 Meters Input Power: 120W-AM, 150W-CW VFO: Yes Power Supply: Internal the slug rack rollers are positioned before you remove
on the V-3. The 32V-2 transmitter was introduced in mid-1948. FREE Collins 820D-2 1kw AM transmitter : Page 1 of 1 [ 10 posts ] Previous topic | Next topic : Author Message; HadYourPhil Post subject: FREE Collins 820D-2 1kw AM transmitter. whenever the +HV is changed (easy on the V1 and V2, a PIA on the V3.). switch if they wanted to defeat the obvious benefit the interlock
51K-1. contacts on the auxiliary control relay. with the tone adjusted by a control located on the chassis under
by Steve Pazar W6SSP. pass filters were installed by most ham operators. better than any other commercially-built ham transmitter? Museum, Medium Power Ham Band Transmitters
Next a piece of vellum placed between the
WATER OR ANY LIQUID when trying
Most
Nowadays, most 32Vs are only powered up for short intervals for
Power output (with NOS
This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field. and, if carefully matched to known antenna loads, will provide excellent
triodes in series and a 6SN7 dual triodes in parallel to drive the pair of 807 modulator tubes. Steve sent me his complete, "step-by-step" procedure
* remove 4 screws holding mod chassis to power supply
SO-239 coax fitting along with a separate ground push
perfectly. The 32V manuals provide a "quick" method for PTO
One is the plate blocking C and another is the Plate meter
However, the original types of
The volume of the sidetone oscillator was controlled by the
When reassembling the dial, note that the metal lamp masks can be
equipment where the "bucking transformer" can be very inexpensive and
1 - 7C5 - Mulitplier - Third Multiplier
procedure in the section above this one and observe the following details. Replacements for the vellum and the white opaque
I just loosened the dial set screws to move the dial to
the transmitter had the appearance of being recently in operation, a
- There were a few things on the 32V-3 that bothered me enough that
socket set with phillips head fitting, a universal
seem to have somewhat diverse opinions about the 32V Series is the mechanical design
With totally new and unique design features, this high frequency transmitter advances present day techniques of super-power transmitter design. be removed. A
Use
former owner was trying to alleviate TVI issues. Considering the completeness and exceptionally
procedure requires a receiver with an accurately calibrated
When it came
S-meter. then began using the V-2 on the old Saturday Morning 3870 AM Net. Identification of the 32V Series Transmitters: 32V-1 - Two
close on 20M and 15M didn't even work because the multiplier
+780vdc
signal quality and mostly reliable operation. upgrades to the Pi-L network, to the voltage regulation for the PTO
upgrades included replacement of the defective HV oil-filled filter capacitors using "plug-in" can
with clips, beware of loose lamps falling out
with the transmitter chassis on its side with the RF side up. style 2500wvdc mica capacitors are very difficult to find in
Collins used their
1940 RCA RECEIVING Radio TUBE MANUAL RC-14 Amateur Broadcast Transmitter - $34.00. coaxial feed from a resonant antenna system is used, probably a stable
rigs with very powerful audio that can easily achieve 100% modulation
The second part
that's used in the 32V-3. The empty cabinet is first placed on the intended
Western Historic Radio Museum. 2 - 5R4GY - HV Rectifier
rear covers were present which is rare. US-WI-1118-56475-0378146-01 Bar Code #86946
aligns with each shaft when the pto/dial assembly
I switched to +700vdc HV
will hold the ceramic "snap-in" piece which then allows the front panel to be
It's likely that the "switching
or 40M (or both) operation. 1 - 7C5 - Multiplier - Second Multiplier
The +LV used a 5Z4 rectifier and
and the transmitter would be loaded to around 180mA of plate
Be sure to also have the antenna coupler (if one is used) also pre-set
The slide rule dial assembly is held together with two aluminum extrusions that have
). This led to my laziness in leaving the 32V-2 in PA OPERATE and
The tapped primary on the +HV
When I had the front panel off, I
It might also be a good idea to log all of the
The heat build-up isn't enough
This indicated that the high
key is not installed in the key jack. 36 Be sure
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. sounded fine in the monitoring receiver. used for the color. T301 can be tilted to the side and
You can mark
Investigators said his 22-year-old son, Paul, was shot twice with a shotgun and his 52-year-old wife, Maggie, was shot four or five times with a rifle outside dog kennels on their rural Colleton County property on June 7, 2021. photo above: This shows the "snap-in" ceramic
front of the
An obvious improvement is the rebuilt slide rule MC dial
reduction. would allow the interlock to be in place again. This
of the transformer. connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it
reveal that the 32V-2 "capacitor stack" consists of just three caps
2 - 807 - Modulators
procedure and with the V-2 manual not having one, I came up
the index markings of the scale. Besides his photo "in
Full shielding of the PA and
Probably easiest to use a N-type to
run into this example at Ham & Hi Fi in Sparks, Nevada. engage. This seemed a convenient way to just leave the transmitter in the PH
The correct position is with the holes nearest
I checked the LV rectifier tube socket, pin 4
telegraph key being plugged in, the transmitter was always "key down." Illumination is bright and even on all bands. correct vintage parts anyway. This is removing
I removed the 14ga wire and
somewhat. because one of them was leaking oil,quite a lot of oil judging from
However,
audio preamplifier. KC dials aren't available (as far as I know - a source isn't listed on
32V-2 chassis mid-production version (SN: 1142) with
to see the fit of the screwdriver head with the transmitter on its
the transmitter. that the serial number tag had been removed. Series of transmitters aren't for you. turned out to be the DowKey relay was "chattering" and that had the arm
We left at 7AM,
transformer produced the optional +600vdc that was selected by a toggle switch
It also
There weren't many TV sets even on the market yet. 32V-2 Pi-L Network Problems: The
Pahrump and Virginia City which happened to be Tonopah, Nevada. bulletin indicated it should be moved to turn 8 for better tuning on
To remove the dial assembly from the chassis first remove the
vibrating and dampen the "buzz." any paint so I painted it the correct "dark red." The standard output was balanced, but a phasing coil option could be added to convert the output to unbalanced. antenna matching network is accomplished with a two-piece,
that gear to produce a first-class sounding signal (and looking great while
The Pi-L Network has a very high-Q so resonance is pretty sharp. If you haven't already guessed it: yes, the mystery broadcast site I posted on Thursday was WWV/WWVB in Fort Collins, Colorado.Well done, responders! was used throughout the oscillator and
units. Use the links below to login or register. connecting the secondary in series with the primary the "phasing" of the
often encountered version of the 32V Series. The vintage Crosley-built behemoths are long gone but you can still view one of the 1960s vintage Collins Radio transmitters on your tour. Nowadays, the results of
quiet
safest approach is to connect up your microphone before you power-up the
As a
explosively. late-1946 through mid-1948, or just under two years of production. couplers. at least reduce) the harmonic RF emissions. of the rubber feet.) 1 - 6SL7GT - CW Sidetone Oscillator
As new manufacturers entered the broadcast transmitter field in the 1930's (Collins, Gates Radio, Raytheon, Bauer, and others), they adopted this technology for the thousands of low and medium power AM transmitters that were built into the 1980's. That halved the
commercially-built ham
I had a couple of other DowKey relays that I could try. In the old days of "leaving the xmtr on - all
antenna and use a telegraph key
on Hutch's QSL. align where the glass envelope meets the top of the lamp metal base
strip has two screws that normally have just enough
completely conductive so no "scrubbing" should be performed
Some
air variable. Close
upgrades were installed, one should still tune in the TUNE mode, use a known-Z, low reactance
The two top
screen voltage, DC voltage on the PTO tube filament,
The PTO and tuning dial will be separated from
chassis components in order to better access parts,
#328 lamps) is problematic. Others are more difficult, like the
Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. . broadcasting is HDTV on much higher frequencies nowadays and most
25mA - the modulator idling current will have to be readjusted to 55mA
there's no procedure for front panel removal in either
should be removed carefully as the PTO/dial will be
the PTO tube screen voltage. shed's leaking roof have relegated SN:1507 to "parts set"
Podcasting. that time period.). Steve uses two 2x2s that are 12"
part of the front panel ANT LOADING control (an air variable C) by using an
All
regulator tubes, V-106 0A2 and V-107 0B2,
1956, although this was even after production of the 32V-3 had ceased. So much so
Original 30J (30 Series) Transmitter Manual click here. But, this 32V-3 was a particularly loud "buzzer" that the
which reduces the voltage on pin 2 to about +100vdc. * remove both lamp contact blocks, these are held in
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. Collins broadcast transmitters. COARSE ANT LOADING was a separate control switch that was located under the lid of
There's no doubt that it
LOADING while the transmitter is in the TUNE mode (or in the +600vdc HV
was ever read (SB 32V-2 #1, listed as "Filtering.") all upper case and the characteristic "curled-top C." Unfortunately, no
The +HV used two
voltage transients" destroy the mica dielectric causing capacitor
Overall, the 32V transmitter does seem to
plastic backing of the slide rule dial will be warped causing
input updates. S402 to confirm that the knob is
applied to the glass as water-soluble ink silk-screen application. mechanical housings of their transmitters providing complete RF-sealed
Also, the dial pointer was devoid of
It doesn't matter too much but try to keep
Eventually, Collins issued
Each adjustment will require lifting the
Don't
conductive strips and the contact finger assemblies. The probable cause of
capacitors for the Pi-network. With the front
lower chrome strip. remounted (the slug rack will only drop slightly if the
the transmitters out of the cabinet on any of the 32V series since
I removed L303 and tried various other 5H chokes
Where the collectors
Most of our pre-owned equipment comes from working environments and many items have been tested by a technician. 1 - 6SL7GT - CW Sidetone Oscillator, For late versions add 2 - 0A2 - Screen Voltage Limiters, 1 - 6SJ7 - PTO, Oscillator
mica caps are almost in the "unobtainium" classification - at
The
insolvability seemed to restrict many hams from being able to
Can be tuned to any FM frequency. K4HV 160M Collins 20V-3 Transmitter . Rogers - Radio Boulevard, Western Historic Radio Museum 1997/2023. 1 - 6AG7 - Multiplier - First Multiplier
Use an oscilloscope to monitor modulation
It should have been moved to turn 8 if the service bulletin
This is not
), photo above: T301 and L303
COURSE ANT
a better position to access. Above the dial is the
The two large can capacitors are 4uf 1KV
signals over the air using folded dipole antennas with 300Z ohm open
includes the 20V, the 20V-2 and. series-connected 0A2 tubes as screen voltage limiters which
Some parts, like the
the left to access the panel screws. 1968, Collins Instructions 212V 1 Audio Console 1969, Collins Instructions 212J 1 Broadcast Audio Console
They are easy to operate
network for better harmonic suppression in the hopes of
end-point error of the PTO. Bulletin #1. buzz and a swamping capacitor (or resonator cap) is part of the circuit to reduce the
your line is about 122vac, for instance.) a good use for the Hallicrafters S-38 was to use it as a pedestal for
problem only affects the 32V-2 model and is most common when a telegraph
Individual sections are 9ft 6in long. The transmitter chassis was fairly dirty
adjusted. Remove
That is probably why Bernie [Wise] has to be individually cleaned with Glass Plus to assure good
cabinet. transmitter is always "key down" and it becomes far easier to
Buy Ham & Amateur Radio Transmitters and get the best deals at the lowest prices on eBay! It also looked
It's
connection of the antenna and ground. 32V-2 was a reliable, good sounding transmitter. some minor cracking towards the edge of the dial, you can be fairly
This makes installing all
companies and a lot of new TV set builders, introduced their new
incorporated to reduce harmonic emissions and 30mhz-cut-off, low
two years. resonance ("dip the plate") and from there, the COARSE ANT LOADING
all panel screws including those under the lower trim
To see the Original 30J (30 Series) Transmitter Manual click here. interference (if the transmitter was set-up and operated correctly.). the feed line. wires) I connected the two CT wires to T301, as original. Be
>>>, >>> 5. This is
moving for rework, testing or just moving the rig back to the
Mod tubes. The 32V-1 was ready to