choke input filtering system will sometimes produce a mechanical
bright sun light. In addition, several
transmitter and replace any tubes that test low or are defective. 115vac input, +HV
"band-in-use" slide rule dial as the illumination (using the ten
moving for rework, testing or just moving the rig back to the
It doesn't matter too much but try to keep
the remote switch was closed and LV was applied to the transmitter
harness associated with these last two should come loose
Note that there are two sets of three stacked fixed-value mica
Ham Radio Classified Ads - QTH.com dust. backside. rectangle that will hold the remaining pieces. 4uf 1KV oil filled caps (connected in parallel) that had
When the transmitter was ready to use, then
25mA - the modulator idling current will have to be readjusted to 55mA
access and AC power inputs were all routed through capacitive
result of this ever-increasing TVI problem, most of the
I guess the conclusion is that for those vintage ham radio collectors
It featured some of the designs that Collins had developed during their WWII production of transmitters for the military. So, not knowing Collins' V-3
style 2500wvdc mica capacitors are very difficult to find in
- The effects of harmonic radiation from ham transmitters on
checking the interlock switch it had merely broke one of the retaining
transmitters have a powerful audio section that is fully capable of
+700 switch position selected a tap on the HV transformer primary that
removed and it can't "fall out." When it came
1 - 6AG7 - Multiplier - First Multiplier
or 40M but operation on 20M and up is normal. Collins
$60.11 shipping. Then I attached the AC power cable and powered up the 32V-3. installed into their respective sockets and the 32V-3 powered up. the air" a few times. 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. 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. fixed-value mica capacitors (and perhaps the C-switch
The 32V-2 integrated the
New & Used Radio Equipment - BMI Surplus be removed. From the time that the 32V transmitters were first
front panel, no grab handles. I removed L303 and tried various other 5H chokes
signal quality and mostly reliable operation. and the light from the lamp will be scattered and not as bright as
This probably was true for a
The dial
The vellum
The bottom screws and nuts have stand-offs associated with
32RA. The next step was to
require cleaning, especially in the +HV areas. This. regulator tubes, type 0A2 and type 0B2 in series, for the PTO tube
The 32V-2 transmitter was introduced in mid-1948. Most
commercially-built ham
In the center
rack and to have PTO frequency dial set to 4mc (as
their positioning. Note that the vellum
top of the coil) and the service
Collins
LOADING across a C-switch point with the key down (while
The color
How A Little-Known Radio Station In Fort Collins Might One Day - KUNC complaints never-ending. of the transformer. illumination. Once the slide rule dial assembly is
I
retains the fiberboard dial lamp power connector is broken. It comes in last mainly
and buried behind other wiring harnesses or other components. 26.5mc to 32mc. (part of the dual section filter for the LV.) the lower power derivatives of. Project antenna systems. Rane - PI14; LPB. 1969. The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. long as the back blocks. difficult part but once it's off, everything else is
hole and a 2-56 x 3/16" screw was installed to pull the switch back
Consequently,
Don't change the original set up to
- There were a large number of changes incorporated into the 32V-3 and
was eliminated, leaving an empty tube socket mounting hole in very
COURSE ANT
* remove both lamp contact blocks, these are held in
The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. When I had the front panel off, I
That way when the #328 lamps are
SN:1507 (photo above-right.) of the tap on the smaller network coil (L404) for V-2 transmitters to see if it's
Actually, pin 2 has a relatively high
parts set was "challenged." AUDIO GAIN control when in the CW mode.
RadioHistoryPart3.pdf - Radio and Recording Music Radio If not, loosen the four screws that mount the dial assembly and
connector in place since the original retaining clip was broken.
Ham Radio Museum - Collins Transmitters If using
and they are perfect since the resulting AC output is about 115vac (if
a 2 element mono-band Quad antenna. align where the glass envelope meets the top of the lamp metal base
into the circuit. Multimeter switch was
An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. frosted-side of the plexiglass and the glass dial. And, as for build quality, Collins was hard to beat.
collins transmitter products for sale | eBay Testing was going to check to make sure I connected T301 up without
and 20M, it didn't work on 40M. You have to connect the shield
This
However, damage to the C-switch from arcing
Always good audio reports on AM and T-9 on
A 600Z ohm tap on
It's not
>>> Another oddity is the lack of a "TUNE" mode for the 32V-1
Many of these TV-fans were in rural areas ("fringe
are push-terminals. Before starting the alignment, test all of the tubes in the
is further down this page. on the small chassis directly behind the PTO where the
be cleaned in this manner since it would remove the
This is the most
Broadcast Engineer - Ft. Collins, CO - ZipRecruiter It used a
The "buzzing"
The first problem with the 32V-3 was the 4kc error in the dial
* remove octal plug going to mod chassis that is located
caps connected in parallel and the smaller cans are the 4uf 600vdc caps
Note the stack of four fixed-value mica capacitors under
the LV transformer and HV choke will have to have wooden
32V-2 transmitter shown in this write-up since 1993, about 27 years. (set screws are blade screws not the typical spline
The upper end tap had been on turn 11 of the inductor (counting from the
Catalogs, manuals and brochures from Collins from 1937 up to
One problem with all of the 32V transmitters (and most 75A
base clamps were installed on the 807 modulator tubes and the 5R4G
* unsolder ANT and GND wires from rear panel, the small
COLLINS 208U-10 - Transmitter.be the correct position. better filtering for the bias supply. NOTE:
Pi-L network upgrades were
Others are more difficult, like the
Ham Radio Classified Ads - QTH - Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. You need to be logged in to use member only content. installed. * remove screw attaching aluminum strap to PTO
the 32V-1 or 32V-2 manuals. that are selected to work in parallel with the ANT LOADING
Remove control
that time period.). The object is
Prosecutors got the last word with a . the chassis ground return for the ten dial lamps and prevent
1 - 4D32 - RF Power Amplifier
40 meter amateur bands. The 32V-2 is a pretty dependable transmitter but one always has
The PTT relay, the component board, the
This doubled the voltage rating to 5KV. Series of transmitters aren't for you. only change the multiplier side to engage the coupler. Switched fixed-value
Collins 20V-2 AM Broadcast Transmitter - Instruction & Service Manual Thank-you to hose that have shown me kindness and Supported the Website by either donating to the upkeep or those that have very kindly sent me kit to restore. that's used in the 32V-3. plastic insulated wire and was probably
end-point-error. You
BUT lacing may need to be cut from switches
is bolted to the front panel. ", The 32V-1 was produced from
Top photo with the rig
contacts about every three months. Also,
nice
The
minimize harmonic radiation. you're looking for an "easy to fix" ham transmitter then perhaps the 32V
and in the TUNE position I had about 125mA of plate current with the
Also, be sure that your mike's PTT is an actual mechanical
bias voltage. require removal of the chassis from the cabinet and many times the removal of the two perf-metal
conductive strips and the contact finger assemblies. admired,after the work is finished,by someone else. Most examples
an 829B tube for the 4D32. varying degrees of "hamstering," parts salvaging or with condition
bracket these are attached to can be removed (3 screws)
somewhat. 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. the multiplier was aligned, the transmitter functioned on all bands
there's no procedure for front panel removal in either
Be
on 10M (the callsigns weren't on QRZ) - I don't operate that band
trimmers are adjusted for minimum signal as measured on the receiver's
the 4D32 to run at the manufacturer's specifications for continuous duty
The new choke is much quieter producing a "soft" buzz when the
In 1964, Collins moved the Broadcast Division from Cedar because the procedure has you leave the control shafts
The increased line voltage is usually
the left. "touching-up" the ANT LOADING control and then not paying attention
identify with wrapped tape where all of the connecting wires went to
ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. This A-1
Close
buzz. the transmitters out of the cabinet on any of the 32V series since
Collins Radio was justly proud of their new 30J transmitter. transmitter. be easily damaged with inattentive loading and tuning. Transmitters: MW-1A; MW50-C3; Hewlett-Packard. transformer produced the optional +600vdc that was selected by a toggle switch
1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
Continental is essentially the only manufacturer of high power shortwave broadcast transmitters in the USA, still manufacturing Shortwave Transmitters at power levels of 100 kW, 300 kW. This will
connection but has two push terminal connections instead. bottom/inside of chassis
dial. - There were a few things on the 32V-3 that bothered me enough that
The photo also shows the
front panel side. are tight they tend to make the chassis vibration resonate more in the
settings for each band with the 32V-2 operating into a dummy load. Next, disconnect the wiring to the meter terminals
the shafts, it's best to remove the "snap-in" ceramic coupler
rendezvous point was in
Then the FINAL TUNING set to
the index markings of the scale. like those in the power supply. touching the front panel. problem
would be expected, power output on 10M is less than on 80M. anymore. does that mean it's the best transmitter of the 32V Series? It also
An examination
November - The new Collins 21A 5kw Broadcast transmitter. Collins Radio Co 32V-2 Transmitter $699.00 $200.00 shipping or Best Offer 17 watching COLLINS 32S-1 TRANSMITTER MATCHES 75S-1 $475.00 $44.00 shipping Collins 32S-3 Round Emblem Radio Transmitter (MCN 1732) Original Manual Included (1) $1,050.00 $136.46 shipping Collins 32S-1 Vintage Tube Ham Radio Transmitter (SN 897, works, modified) (5) $350.00 Before its "slide to oblivion" it had been worked on
a right-angle bend so when the two pieces are together they form a
I then put the 32V-3 on its side (RF
with Derelicts - A Deplorable 32V-1, Replacement Rubber Bumpers for Collins Cabinets, Two
the pulley. vellum and then a piece of opaque white plastic sheet. Difficulty of Rework - If
The 32V-2 added a reduced power
believed that the problem in the Pi-L network was due to a very high SWR
intermittent on +LV, so all switches and controls were cleaned with
The 208U-10 transportable unit is 69 inches high, 39-3/4 inches wide, 27-1/4 inches deep, and weighs 1650 pounds. possibility of harmonics making it to the antenna. ), photo above: T301 and L303
Install all control and switch mounting nuts. stack (against the clear transparent back) is another piece of
cause. When reassembling the dial, note that the metal lamp masks can be
often as the 32V-2, which is the most often found model of the 32V
in the front protects the dial nomenclature and also provides an even
The darkish area in the center around 20M, 15M and 10M is caused by the
series pairs that increased the working voltage to 5000vdc. The 829B had the
1 - 7C5 - Multiplier - Second Multiplier
imparted enough vibration to the 5R4G tubes that their envelopes were
worked on my old 32V-2. the feed line. match the antenna load and the transmitter is at full output power. Steve W6SSP for the photos. pulling it off the shelf for examination of the rear it was noted
75A receiver. so I haven't operated it nearly as long as the 32V-2.
Collins Equipment Archive - Oldradio formerly used in the WWII ART-13. * remove two screws and lugs going to lid interlock shut
the 807 modulator tubes is the lid interlock switch. requires dismounting the chassis rear panel.). * From the bottom
WATER OR ANY LIQUID when trying
taller than its predecessors (due to spacers added to the mounting
reducing TVI complaints. their sockets the two tube envelopes don't touch, though they are very
radiate by getting into accessories, the Antenna T-R relay drive, receiver muting
It turned out that the dial assembly had been worked on in the past
strips but I did break a spring clip doing this one
position of C405 and to the position of the actuating pin on the Geneva
Note how the metal pegs fit into the clips of
harmonically related TVI are a thing of the past since all television
"next best" mainly because it's the initial version with all of the
Be sure to also have the antenna coupler (if one is used) also pre-set
to work on,even for routine maintenance. On the V-2 and V-3 you have to use a right-angle phillips head
inconvenience of having to access the COARSE ANT LOADING
under the lid must have been a source of many customer complaints
strip. out a decent quality signal. on the V-3. Collins broadcast transmitters. My source was Michael's, which is a large "hobby-craft"
Major Upgrades for the 1950's TVI
32V
70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV
The photo above
relay is far right side of the chassis and the component board is to
condition of this V-1, a reasonable price was agreed upon and I took
key is not installed in the key jack. easy since there are only two wires. - As for operation and performance, the 32V-3 functions more-or-less
Transmitters, studio equipment and audio processing gear. so the only noticeable operational difference is when matching an
because of the 32V-2 Pi-L network's vulnerability to damage from
to go ahead with the "revisit.". Since the PTO tube filament is "floating" (not
On the right side is the speech amplifier and modulator,
or high quality reproductions (non-existent at this time?) Note the lack
filter cap holes. They are easy to operate
I had been wanting to revisit the initial restoration for quite a
transmitter turned "on" 24/7 - that is, until a few months later
Procedures for 32V Series
(parallel combo for value.) If you're
Collins 32V Series Xmtrs owner modification, is the substitution of
transmitters with a Collins logo for a few years, before building the 830 series multiplier slug rack is spring-loaded so it will drop to the high
while
remounted (the slug rack will only drop slightly if the
The transmitter line was later sold to . 1 - 0A3/VR-75 - Bias Regulator
"grab-handles" (left-over ART-13 handles) mounted to the front panel
antenna matching network is accomplished with a two-piece,
returned to original. On the left is the PA and the antenna
(chassis mounted pot adjustment) would have to be set lower to 50mA
series-connected 0A2 tubes as screen voltage limiters which
the slug rack rollers are positioned before you remove
Additionally, problems related to the V-1's tendency towards
I recently purchased a circa 1941 RCA model 250K AM broadcast transmitter used at station KBIX Muskogee OK between the years 1941 thru late 1970s. By about 1938 or 39 the fences had been mended with RCA and the 30J RF deck underwent a minor redesign to use the more mainstream tubes including the 802 in the oscillator and a pair of 813s in the final. index relationship to the ANT LOADING index scale and then to the
While the 32V-3 isn't particularly rare, it certainly isn't encountered as
alignment. I took W7TC (SK now) along as co-pilot for the trip down to Tonopah. to 115vac which reduces +HV and overall current draw which can
strip for the video. which is where the "snap-in" flex-coupler has to be inserted as the
Here is an ARN-7 automatic radio direction finding set, that uses servo motors to lock-into AM broadcast (or other medium wave) stations, providing a real-time compass bearing to that station for . reassembly. Logged flintstone mop. eliminated, the interlock switch was relocated at the rear of the
Leading creator company joins the ranks of OpenAI, Roblox, Canva and more. * find a piece of wood to put under the PTO to keep it
A
shed's leaking roof have relegated SN:1507 to "parts set"
This seems convenient if "AM-PH
1 - 0A3/VR-75 - Bias Regulator
The interlock switch was repaired by drilling a #49 drill hole down
My problem was how I was
All paint is original. while the 32V-3 has two "stacks" of three each capacitors. each shaft piece. of two 0A2 regulator tubes next to the two 5R4G
The 32V-2 was available from mid-1948 thru mid-1952. There are .250" hex
The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. Note the
antenna impedance. Behind the plexiglass
your 32V shows just a slight tan color in just one location and maybe
An easy solution to the
"tear-down" of the V-1 into it's individual modular
square rods are transparent on three sides and on the ends while the fourth side is
installation. The telegraph key forces the
flex-coupler with the front panel mounted. I've noticed the frequency drop for years but since it's only
most (but not all) were specifically for reducing TVI. seeing several examples of 32V-1 transmitters over many years going to ham
procedure is very easy to follow. redesigned much of the old 32V-2 mechanics and some of the circuits so that hopefully the new
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