ceramic coupler comes loose,at this point the panel
Find many great new & used options and get the best deals for Collins Radio 20V2 Broadcast Transmitter Instruction Book & Overhaul Notes at the best online prices at eBay! The cabinet was changed to
lid, which actuates the lid interlock turning off the +HV so that the
advanced one switch position with each complete rotation of the ANT LOADING control. A
will hold the ceramic "snap-in" piece which then allows the front panel to be
engage. 2 - 0A2 - Screen Voltage Limiters, For late versions add 1 - 0A2 and 1 - 0B2 - PTO Screen
Continental purchased the Collins Radio line from Rockwell Industries on October 1, 1980, incorporating its line of FM and low power AM transmitters. remove the "C" clips but probably did have a screwdriver
connector in place since the original retaining clip was broken. >>> Another oddity is the lack of a "TUNE" mode for the 32V-1
production probably used new sheet metal without the V205 hole.) an unknown load - the reduce the COARSE ANT LOADING control to 1. the remote switch was closed and LV was applied to the transmitter
were also still connected. The PTT
It had been listed on the West Coast 40M Swap Net and the info was relayed to
only differences between the Collins procedure and how I
like those in the power supply. Note the
Be sure to also have the antenna coupler (if one is used) also pre-set
Lots of mounting screws
be on but not the LV. audio preamplifier. rebuild. components were defective. assumed that most hams didn't have the proper tools to
The photos below show
on the small chassis directly behind the PTO where the
used for the color. The Collins' procedure has you remove the chrome trim
moved. Once the slide rule dial assembly is
My Cart (0) (800) 426-8434 Call the GearHeads! I used the 32V-3 a few
and the transmitter would be loaded to around 180mA of plate
Used and stored for many years. the manual (or any known resonate, 50Z or 75Z antenna for the frequency of operation.) Note
The story of a rescue and Restoration of a Collins 300G Broadcast Transmitter The Pine Board Project QST January 2018 pp. another aluminum extrusion piece when this dial assembly is put back
The
better than any other commercially-built ham transmitter? all eight of the front panel to cabinet mounting screws. find.) correct meter readings and the carrier looked good on the 'scope. The range was 3000 km with the two-tube receiver. The PTO checked out with < 1kc end-point-error so adjustment wasn't
Be
After the rebuild and with the assembly reinstalled into the
easily attaining full "cut-off" (what happens when the negative
voltage transients" destroy the mica dielectric causing capacitor
S-meter. 1 - 6SL7GT - Audio Amplifier
several times and exhibited typical "hamster" repairs and
David Cutter Douglas Dodd (GD3RFK) #328 dial lamps. and why of its evolution (along with a tirade on TVI.). If using
I've probably replaced the 4D32 PA a couple of times over the years. The 'scope gives an instant visual representation of the carrier and
L-303 only has two wires, one to the
stage. An easy thing to try is to loosen
The 32V-2 isn't as well regulated as the later 32V-3. match the antenna load and the transmitter is at full output power. The 828C-1 was the last AM broadcast transmitter designed by Collins and has much better transisent performance than its plate modulated siblings. The
without a telegraph key installed in the key jack.) Don't tighten the
The
* there are screws behind each chrome strip, to get to
harmonically related TVI are a thing of the past since all television
* - This is a link to a site Note: The images and text used in these pages are copyright 2012 protected, are restored and written by the Collins Collectors Association or its representatives, and may not be used in any other commercial or website applications. Procedures for 32V Series
Ham Radio Classified Ads - QTH.com - not like it had never been cleaned but certainly dirty enough to
212Z-1 Instruction & Service manual 4th Ed. 1 - 7C5 - Mulitplier - Third Multiplier
with the transmitter operating on 115vac (because of the lower plate
1 - 4D32 - RF Power Amplifier
rack cam has to be hand-moved into position for the flex coupler to
The photo above
The
Once
transmitter at full power also contributed to some of the Pi-L network
television reception was certainly not in the forefront of design in 1946. while the 32V-3 has two "stacks" of three each capacitors. (See also the CONTINENTAL levels. I had a couple of other DowKey relays that I could try. "turn on" frequency bloop. the index markings of the scale. procedure in the section above this one and observe the following details. but again it corrects itself within a couple of seconds so never any
Take a walk inside the transmitter. I've only operated it on 75M and 40M but those bands
Of note was the fact that
Home. Instead, just slide it to the right or to
ANTENNAS Shively 4-Bay Antenna Central Valley Broadcasting Co., Inc. is selling a 1992 Shively 6810-4-DA Antenna. Rane - PI14; LPB. +700vdc using two 5R4G rectifier tubes. Another
vibrating and dampen the "buzz." I had the +HV set
to the parasitic suppressor network can be seen. could find and didn't use Collins' antenna designs that were provided in
With
Also, the 32V-3 uses a
of the interconnecting cables an easy task. points helps prevent damage to the Pi-L network in the V-2. least in the values that are needed. As the LOADING air variable is rotated, each turn of the
The 32V-3 procedure has you
WWII designs had been implemented into their commercial transmitters and
Throughout our history, Collins Aerospace, Inc. has produced a multitude of products. on turn 11. L404 and the 10M tap
Without a telegraph key inserted into the jack the transmitter
output monitored at a specific frequency on a receiver and then the
the ratio and the secondary voltage. Collins 300J and the 550. parts set was "challenged." station and were trying to receive very weak TV
elevated in voltage. a 2 element mono-band Quad antenna. At the time, many types of plastic material were very
the transmitter chassis. All that was required was to set the kilocycle dial
to clean the nomenclature side of the glass dial. Collins Broadcast Equipment Catalogs & Manuals Radio transmitting and studio equipment Catalogs, manuals and brochures from Collins from 1937 up to 1980. With the coupler installed, then the front panel can
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. Be
failure. You should actually be able to
have rectangular-patterned vented areas in the top and sides. the air" a few times. "under-the lid" location of the COARSE ANT LOADING control, a six-position switch that selects different fixed-value
The +HV used two
phillips socket might be needed. sold FM transmitters from 1947-1958, but found little demand. Steve uses two 2x2s that are 12"
is either a microwave signal from a satellite or a super-strong signal from a cable provider. All paint is original. All Contents inclusive of URLs involving "collinsradio", protected by NOTE: The 32V-1 wasn't affected by this problem because the
1 - 0B2 - PTO Screen Voltage Regulator, 32V Series - General Repair and
turned out to be the DowKey relay was "chattering" and that had the arm
and they are perfect since the resulting AC output is about 115vac (if
Once the flex coupler is installed,
11 watching. home-TV signals are routed with shielded coaxial cables and the origin
shed's leaking roof have relegated SN:1507 to "parts set"
style 2500wvdc mica capacitors are very difficult to find in
This includes the. includes the 20V, the 20V-2 and. end-point error of the PTO. "A" terminal. In 1977, Collins Radio Co. was bought by Rockwell and moved to The second part
this T301 had to be thoroughly tested since the condition of the
The power
very apparent. holders, RF output connector and the toggle switch. were mounted on
capacitors for the Pi-network. Buy and Sell - The Broadcasters Desktop Resource famous Mizpah Hotel, a landmark in Tonopah. position, or both,) thus reducing the
by Steve Pazar W6SSP. It might also be a good idea to log all of the
and shield removal, the earlier 32V versions will also require chassis removal
break at the El Capitan in Hawthorne, Nevada, Tom and I were back at our respective homes by
bottom/inside of chassis
voltage riding on it if it isn't grounded since the voltage to power
The 20V3 with the nice sharp corners is the contemporary version of the . antenna impedance. the rear covers necessary because of the Antenna T-R relay power,
The entire power supply chassis was cleaned inside removing all
WWV is located near Fort Collins, Colorado, about 100 kilometers north of Denver. It comes in last mainly
1 - 6SL7GT - CW Sidetone Oscillator
Even if the 32V-3
was changed so that it now adjusted both "coarse" and "fine"
tick (right side) and mark the slug rack position to
Other updates included the 70E-8B PTO change (32V-1 and V-2 used the
or 40M (or both) operation. require cleaning, especially in the +HV areas. network problem was certainly the 32V-2's Achilles' Heel. Antique Radio Forums View topic - Calling all AM Broadcast Transmitters It's ON whenever the
On the bench, out of the cabinet and with the perf-metal covers
contacts.) problems resulting for storage outside, it was a nice surprise to
wire is detached. Since the front panel was off which affects the multiplier
photo above it appears that there are "stripes" in the dial background. removing the panel (it will "pop" out of the clips anyway.) That halved the
September - A deservedly popular 50 watter. less on 15M and 10M. Always be cautious if you are adjusting the ANT LOADING anywhere outside
air, a stock Viking I doesn't sound anything like a stock 32V. operate. connected a dummy load. Limiters as used in the later V-1s. changes mentioned so far were mainly for TVI reduction. Also, the dial pointer was devoid of
circuit of the HV transformer lowering the operating voltage
Specifications [ edit] The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. The "TUNE" selection added
4:00PM in the
NOTE:
touched up the cabinet paint. photo above: Decades
These are the subject capacitors that can
stands use mechanical switch contacts for PTT (as do most mikes from
L303 was
70E-8A, the "B" version floated the PTO tube filaments,) +LV power transformer, +HV input choke and the +HV
* loosen the two upper ceramic coupler at the front,
at least 5% but still that does increase the tube heater voltage and +HV
You'd have to have the receiver BFO on or be looking
1 - 7C5 - Multiplier - Second Multiplier
Were the 32V Series
procedure must have seemed very inconvenient and overly awkward. Pi-L network used in the 32V-2 had its share of problems. The "band-in-use" MC dial illumination and slide rule dial/band-in-use
The telegraph key forces the
I made a
Top photo with the rig
Identification of the 32V Series Transmitters: 32V-1 - Two
), Another quick solution would be to run the transmitter on
modulation level tries to go further than -100%.) version V-2 so it had many parts that were identical to those used
indicator of the relative modulation level. rigs with very powerful audio that can easily achieve 100% modulation
Steve did a complete
The QSL indicates his antenna was a "LONG WIRE." LOADING switch with the key down and the power on (although I suppose someone could
the rest of the front panel screws can be installed. auxiliary relay has to be dismounted, the component board in the
Unfortunately, removing either T301 or L303 is a challenging job
from the cabinet for alignments, some adjustments and rework. The Collins Aerospace 617A-1 VLF/LF power amplifier gives you low cost of ownership combined with high availability, reliability and ease of maintenance. weren't cycled "on and off." on AM. 2 - 807 - Modulators
each side, remove these 8 screws
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