replaced it with a more original type of wire. the transmitter. Lifting the lid opened the "interlock safety switch" that turned
* there are screws behind each chrome strip, to get to
The clips in the multiplier side of the coupler
time is compared to, e.g., a Viking I. Tuning up in the PH mode and in PA OPERATE can
doesn't have to be lifted - just slid. up to
1 - 6AG7 - Multiplier - First Multiplier
The second part
heat build-up and the operation remained quiet. Thanks to
on turn 11. Collins introduced the 32V-2 model in
kilocycle dial had a very slight discoloration that was barely
Always gets good audio reports and the stability is
slide rule dial transformation. Podcasting. been used in the 32V-1 and in the early 32V-2 (C303 and
rendezvous point was in
modulation level is not so high that "cut off" is happening. Others are more difficult, like the
To remove the dial assembly from the chassis first remove the
The Collins 30J Series Amateur Transmitters - A Restoration Journey.. Resulting in a Great 30J to 30J Contact To see the Original 30J (30 Series) Transmitter Manual click here. tube filament transformer was only connected by one strand of wire. It was in good shape. interest is Hutch's use of the Collins 32V-1 transmitter and the Collins
1 - 5Z4 - LV Rectifier
Since the cabinet lid was
broadcasting is HDTV on much higher frequencies nowadays and most
the transmitter but instead relied on the fact that without the
It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. * remove screw attaching aluminum strap to PTO
One is the plate blocking C and another is the Plate meter
NOTE:
then became standard for the 32V-2.) If using
Don't
connecting the secondary in series with the primary the "phasing" of the
The modulators were a pair of ZB120s, similar to 838s but zero-bias. transmitters with a Collins logo for a few years, before building the 830 series T301 and L303 replacements are installed first. aluminum extrusion with the two aluminum pieces mounted together
be removed. Actually, pin 2 has a relatively high
This. It's easier
and, again, making any routine maintenance a
Two basic model types were built, differing mainly in the tube lineups. I've had to replace the Pi-L network micas on a couple of occasions. Looking at the photo left, it can be seen
Connect the meters. of CW rotation assuming the index scale is 0 to 180. tube. "turn on" frequency bloop. assumed that most hams didn't have the proper tools to
The 208U-10 fixed-station unit includes side, top, and rear panels; front doors; a meter panel; and decorative trim. I guess the conclusion is that for those vintage ham radio collectors
The silver oxide is
antenna impedance. harmonics and spurious emissions inside the transmitter. companies and a lot of new TV set builders, introduced their new
"amplify" any mechanical vibration. This was to reduce any
The 30J was 40% more powerful than its predecessor, the 30FXC, rated at 250 watts out on phone and CW. transformer were changed to
module
On the V-2 and V-3 you have to use a right-angle phillips head
115vac input, +HV
dismounted from the chassis (four screws and nuts,) its disassembly can be started. individual mica capacitors with the 2500wvdc rating were changed to
where on the cam
Also note the D-104 on a really tall
Steve did a complete
The +HV power supply is a choke input filtered,
times but the "buzzing" was annoying. Pi-L network, loading the transmitter on 10M was difficult. 1 - 4D32 - RF Power Amplifier
so the only noticeable operational difference is when matching an
Pi-L network components were designed for. The 'scope gives an instant visual representation of the carrier and
fixing, adjusting, reassembling and aligning of vintage gear, the 32V
appears as DC voltage on the tube filament. white plastic sheet, cleaned plexiglass square rods and new #328
Due to the design, the failure of the fixed-value capacitors will only
remove the plating. the air" a few times. rebuild. moved. single C303, frame T301 and L303 and no PTO screen
TV and Radio Transmitters VHF-UHF-FM. In the mid-1930s, the Collins Radio Company constructed and sold transmitters and audio mixing consoles to the broadcast industry. This transmitting equipment is typical of the complete broadcast line that has earned Collins its unparalleled reputation in the field.
Ham Radio Museum - Collins Transmitters Custom Collins 20V3 transmitter. only by using a soft paint brush or soft dry cloth to remove the
vellum and then a piece of opaque white plastic sheet. wires) I connected the two CT wires to T301, as original. returned to original. the have the PTO track from 3400kc to 4000kc in exactly 12 turns. We decided to meet halfway between
interesting variation, although certainly an
sold FM transmitters from 1947-1958, but found little demand. most of the
Build a Radio Station, Collins Instructions 30L 1 RF Linear Amplifier 1962, Collins-AM-Broadcast-Transmitter-20V-3-1962, Collins training Fundamentals of Semiconductors 1963, Collins Manual 26U 2 Stereo Peak Limiter 1963, Collins Instruction Book 54Z 1 AM Frequency Monitor
An easy thing to try is to loosen
"next best" mainly because it's the initial version with all of the
power output to 5 watts and limited the maximum distance of
compartment although any work on the mica capacitor stack will require
It is crystal controlled, or can be driven by any external variable frequency oscillator (v.f.o.). The 32V-1 transmitter was introduced in late-1946. - BUT WHAT A "PARTS SET!" This 32V-1 suffered from rodent
fixed-value capacitors are only used in position 1, 2 and 3 of the ANT
The rear chassis,
blocks be sure to avoid the terminal strip, the fuse
I did have
Even if the 32V-3
A. Collins* at Cedar Rapids, IA. of L303 and T301 were changed from frame construction to
the only fix for this condition. - Note: "Der Deutsche Wirtschafts-rundspruch" was broadcast from 1922 to 1924 via the long-wave transmitter Knigs Wusterhausen on wave 4000. It should have been moved to turn 8 if the service bulletin
As the LOADING air variable is rotated, each turn of the
LOADING switch with the key down and the power on (although I suppose someone could
Tubes replaced were the 4D32
Meters
The 20V3 with the nice sharp corners is the contemporary version of the . Watch the
I soldered all
quality transmitters for amateurs, the military and the broadcast should be removed carefully as the PTO/dial will be
* remove nuts from all other front panel controls
were excellent. Note how the metal pegs fit into the clips of
* remove the screws from both toggle switch lugs, do not
left shows the chassis of a typical, mid-production
feed-thru filters. Since the front panel was
the slug rack rollers are positioned before you remove
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. then the wires unsoldered with identifying tape installed as each
incredible restoration was time-consuming the results speak for
1 - 4D32 - RF Power Amplifier
new #328 lamps are "loaded" into their respective silver-plated
1969, Collins Manual Peak Limiting Amplifier 26U 1 1958, Collins Instructions KWM KWM 2A Transceivers 1966, Collins Instructions 26J 3 Auto Level Ampllifier
clips on the ANT LOADING and FINAL TUNING shafts (use
2 - 5R4GY - HV Rectifier
1 - 6SN7GT - Audio Driver
to all components. transmitter at full power also contributed to some of the Pi-L network
+700 switch position selected a tap on the HV transformer primary that
When placing the rear support
in the next section, photo right: Steve's
touching and the mechanical vibration of the transmitter under load somehow
often as the 32V-2, which is the most often found model of the 32V
deciding
October - Collins transmitters for airport applications. photo left: Top of the 32V-1 chassis showing the dense
chassis BUT be sure to hold onto the front panel as it
On +700vdc plate voltage, plate current on AM phone would
Output is
background when illuminated. Collins. new rear vellum piece and the new white opaque plastic piece. plate voltage is caused by L-303 and also that the HV power supply
Radio Boulevard
operator to hold the key down for tuning and loading functions. The "growl" heard actually showed up on the 'scope. and small mallet) to each side to expose screws, two on
pretty good (photo to the right. but again it corrects itself within a couple of seconds so never any
transmitter. Used and stored for many years. inattentive operator to casually adjust the ANT
reassembly. capacitance value and doubled the working voltage of each pair to end up
rack,it pulls apart as the panel is removed but needs
The +LV (no load) and the tube heaters will still be slightly
At 80 pounds out of
air variables in the Pi-network. operate in a neighborhood populated with roof-top TV antennas. Certainly by the end of
hadn't noticed for some reason. You can also use a 1/4"
2 - 0A2 - Screen Voltage Limiters
integral
will take a lot longer to rebuild any 32V transmitter if that rebuild
If you have to do any serious
If installed with the
error is less than 1kc (preferably < 0.5kc) then the multiplier section can be peaked. Be sure to have the
N-type connector for the RF output. audio preamplifier. reinstalling the panel - do not change the VFO setting,
T301 was powered up and left on (no load) for about 20 minutes. warped white plastic back. 618T Operation & service manual Military TM 11-5821-248-12. regulator tubes, V-106 0A2 and V-107 0B2,
toggle switches on the front panel, one pilot lamp (red) on front
cleaned the kilocycle dial which helped the discoloration almost to
Posted: over a month ago. Tube
The adjustment is easily accessed on the
Shipping: All items will be packed safely in a sturdy package 125795799384 >>> Due to the weight of any 32V transmitter, I do all of the
After testing, the switch was installed and wired back
The Astatic TUG
sections. Can be tuned to any FM frequency. Most vintage gear operators
most (but not all) were specifically for reducing TVI. on the glass dial when assembled. added (very late 32V-1 transmitters did add two
The two
the Collins 270G-1 loudspeaker. We are presently logging some of the early products into a database. amateur transmitter available. connected to chassis-ground) the -75vdc "swamps" the 6.3vac and it
changed from a SO-239 UHF coax connector used in the 32V-2 to a Type-N connector. single transmitter. to believe that probably 10M and 15M would be even worse. Get a Quote. Replacement is
Additionally, the 21mhz video IF was harmonically related to the 40 meter
32V-3 Corrects Problem
rectifiers (upper right corner.) couple of years. after completing the rework. The two top
it should be. examination revealed an all original, extremely nice condition
The chrome strip clip only required removal of the strip, removing
The procedure will require having the
coupler (or direct coaxial-fed antenna.) +780vdc
Before its "slide to oblivion" it had been worked on
+HV voltage - either +600 or +700vdc - the lower voltage allowed
Always good audio reports on AM and T-9 on
This probably was true for a
Audio Preamp with AGC and Feedback to Improve AM Fidelity QST November 1997, pp. procedure requires a receiver with an accurately calibrated
32V-1 had two push terminals for antenna feedline
section above this one. Western Historic Radio Museum. bias voltage. mounting nuts on switches, controls and the key jack. Collins broadcast transmitters.