Visit(Classified)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-02820A000100040019-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 9, 2016
• Document Release Date: April 30, 2001
• Sequence Number: 19
• Publication Date: December 15, 1955
• Content Type: MFR

Approved For Release 2001/07/16 : 8-02820A000100040019-6
15 December 1955
MEMORANDUM FOR THE RECORD
SUBJECT: Visit to Plant
25X1A5a1
25X1A9a
factory in Miami, Florida. The purpose of the visit was inspect base station
transmitter equipment manufactured by that firm, and to get some idea of the pro-
duction capabilities of the plant in the event an invitation to bid on a contract is 25X1A5a1
extended to this firm in the future. The following people were met and
consulted:
dent
Asst
Engi
2. The plant, including offices, is housed within an area approximately 60 X 200
feet. It employs between 50 and 70 people. Aside from assembly, it has facilities for
metal working, welding, etching, packaging and crating. Parts peculiar to 25X1A5a1
equipment may also be fabricated, such as terminal boards, cabinets, etc, Me ing
is not ordinarily done, but can be accomplished when necessary.
3. Two transmitters were inspected. One was a 350 watt Al/A3 fo
channel type, Model 446; the other was a 1 kw, Al/A3 four-channel type,~X1A5a1
Model 1046. matters are similar in many respects with regard to circuits and
tuning procedures, however parts in similar circuits are not all interchangeable. Both
transmitters feature a channel selection switch on the RF panel which when operated
activates ganged motor-driven switches to select one of four pre-tuned oscillator,
buffer and power amplifier circuits, The 350 watt Transmitter is protected from over-
loads by means of fuses alone, six in all, while the 1 W. Transmitter employs circuit-
breaker switches, Both units must be operated from a 200-250 V. single phase, 50-60
cycle source, Remote control units are available which offer dial control of the
Transmitter primary power (or alternatively, the p.a. plate voltage), and frequency
selection, from the operators position. Using the remote units frequency selection,
power control, voice input and keying are accomplished using a single pair of wires,
Remote frequency selection is also possible without the use of the remote units using a
remote switch and cable assembly at the operators position which parallels the
frequency selection switch on the Transmitter. Two types of RF output connections
are available on the Transmitters, accommodating coaxial cables through 80-239 type
receptacles, or Marconi type antennas through standard feed-thru insulators, Spare
parts for these two transmitters are broken into two categories referred to as "major"
and "minor" spares, The major spares include capacitors (above 1500 V. rating) meters,
fan, transformers, chokes, relay, channel and power switches; the minor spares consist
of small parts. such as capacitors (below 1500 V. rating) resistors, r.f. chokes, insul-
ators, sockets, small switches, terminal boards and strips, coils, knobs, gears and
air filters (for 1 kw. unit). The 350 watt Transmitter has a set of "expendable spare
parts" consisting of air filters and fuses. A set of tubes, fuses (where needed), and
plug-in relays accompany each unit. An antenna matching network, 72 ohm unbalanced
to 500/600 ohm balanced Model TLM) is available, but not included as part of
Approved For Release 2001/07/1 78-02820A000100040019-6
. Chief Engineer
neer
 . Approved For Relea 2001/07/16 : CFA`-X78-02820A0004 040019-6
25X1A5a1
either Transmitter. Provisions are made on each Transmitter for connection of eaternal
excitation on two of the channels. indicated that it is planned to
provide input connections for external excitation on all four channels.
4. Details of the 350 Watt (Mod. 446) and 1000 Watt (Mod. 1046) Transmitters:
Frequency Range: 2-24 Mcs.
Type of Emission: A-1 and A-3
Power Input: Mod. 446 2 KVA (Max.), 200-250 V., 1 Phase, 50-60 cycles
Mod. 1046 3.7 KVA (Max.), 200-250 V., 1 Phase, 50-60 cycles
Size: Model 446 - Transmitter is made up in three sections , RF, Modulator and Power
Supply, mounted in a cabinet 22* in. wide X 67 3/8 in, high. Panels are 19 in,
wide.
Model 1046 - Transmitter with Modulator, is contained in two cabinets 22 1/2 in.
wide X 67 3/8 in. high. One cabinet contains the RF' Section and its Power
Supply; the other cabinet contains the Transmitter Remote Control Unit, the
Modulator, and its Power Supply
Channels: 4 (separate, pre-tuned)
Frequencies Accommodated: Six, 2 of which must be within prescribed proximity of two
of the four pre-tuned channel frequencies.
Channel Selection: Automatic. Locally by means of a selector switch controlling motor-
operated switches for each channel; remotely, either by a dial con-
trol on remote control unit, or by a parallel selector switch at
remote locations.
BF Output Impedance: 70-1000 ohms, unbalanced, using pi-network.
Audio Input: 20 db below 6 mw for 1,5 db below 100% modulation.
Audio Input Impedance: 500/600 ohms, single-button carbon microphone input.
Tubes: Model 446
BF Section
1 - 5654 (or 6AK5)
1 - 6146
2-4-125A
Modell 1046
BF Section.
Power Section Modula tion Se .ti on
1-5U4G 4-6SG7
2 - 866A (or 3B25 2 - 828
or 3B28)
2 - 866A (or 3B28) 1 - 6H6
Power Section Modulation Section
1 - 5654 (or 6AK5) 1 - 5U4G 4 - 6SG7
1 - 6146 2 - 866A (or 3B25 2 - 4-250A
ApprcWed pp ease 2001/0/16 $ 7 gy20AQT0100040019-6
 Approved For Release-?Q1/07/16 : CIA 820A000100Q4A019-6
-3-
5. Both jransmitters were inspected physically and operationally. The Model 41+6
is tuned in the conventional manner up to the Power Amplifier output tuning; at this
point, when the plate tank circuit is tuned, a screen current meter is used as a
tuning indicator. The "PA PLATE" meter is in the PA cathode circuit. Since each
channel will cover the entire frequency range of the transmitter, 2-24 mc., it is
necessary to use jumpers and taps on the tuned circuits; these taps and jumpers must
be set by hand with the aid of a screwdriver. A keying test was given the Model 446
unit by means of a keying relay operated from the output of an audio frequency signal
generator; the keying waveshape was observed.on an oscilloscope and was generally
satisfactory within the stated keying speed range of the transmitter, 40 wpm.
6. Instruction manuals and price lists for the transmitters and associated equip-
ment inspected were obtained. The price of the Model 446 Transmitter is $2810.00, the
Model 1046 is priced at $2970.00, less Modulator. The GNP-8A Modulator for the Model
1046 Transmitter is priced at $11,20.25. The TM-PS Remote Control 1anels are priced
at $260.00 each.
25X1A9a
Approved For Release 2001/07/16 : CIA- j4p20A000100040019-6