Baluns, Transformers, Multicouplers

HF Antenna
Multicouplers
2-32 MHz frequency range
20 kW average, 40 kW peak
power rating
Natural air convection
cooling
50 ohm coaxial input
impedance
1.2:1 maximum insertion
VSWR
3.0:1 allowable load VSWR
97% efficiency
30 dB port-to-port isolation
(with matched load)
-40°C to +50°C ambient
temperature
General Description
The transmitting multicoupler
connects two HF transmitters to a
single broadband antenna, allowing
each transmitter to operate
simultaneously without significant
insertion loss. Each transmitter
operates as though the other were
not in circuit-one performing in the
lower portion of the antenna’s
frequency range and the other in the
upper portion. A narrow “guard
channel” of unusable frequencies
separates the two channels.
A multicoupler consists of two
bandpass filters and an output
crossover network. Each filter is a
network of passive, fixed-tuned
elements which are permanently
adjusted to pass all frequencies within
the particular channel and to reject all
frequencies allocated to the opposite
channel.
Consequently, the transmitter
frequency can be freely shifted
within its respective channel
without retuning the multicoupler.
Applications
The use of transmitting
multicouplers in a communication
network makes possible the use of
full capability of modern broadband
antennas. When receiving stations
lie a differing distances within the
direction pattern of a single
antenna, the use of multicoupler
permits simultaneous use of a
“long-distance” and a “short-
distance” frequency, accommodating
a second HF communication circuit on
the antenna. The Model 520F,
intended for shipboard applications, is
in all respects electrically identical to
the Model 520G. For new
installations, consideration should be
given to use of the Series 3000 SPIRACONE antenna which permits
transmissions simultaneously on highand low-angle modes without
frequency restriction.
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HF Antenna
Multicouplers
Characteristics
Multicouplers may be cascaded to
permit the use of more than two
transmitters with one broadband
Their power ratings may be
intermixed to obtain the lowest cost
for a system.
Type
Number
579
520G
557
Power per Channel
Average
2.5 kW
10.0 kW
20 kW
Crossover
Band*
Peak
5 kW
20 kW
40 kW
16.5%
16.5%
16.5%
Std. Connectors
In
7/8”
1-5/8”
1-5/8”
Out
7/8”
1-5/8”
3-1/8”
* Upper limit of the lower channel must be at least this percentage below
the lower limit of the upper channel.
Ordering Information
Typical Ranges of Lower and Upper Channels*
2.5 kW
Type Nos.
579-21
579-54
579-71
579-91
579-113
579-141
579-150
579-187
579-231
579-314
Lower Channel
2.0 to 3.50 MHz
2.0 to 5.15 MHz
2.0 to 6.00 MHz
2.0 to 7.00 MHz
2.0 to 8.10 MHz
2.0 to 9.50 MHz
2.0 to 9.95 MHz
2.0 to 11.80 MHz
2.0 to 14.00 MHz
2.0 to 18.15 MHz
Upper Channel
4.20 to 32.0 MHz
6.20 to 32.0 MHz
7.20 to 32.0 MHz
8.40 to 32.0 MHz
9.75 to 32.0 MHz
11.40 to 32.0 MHz
11.95 to 32.0 MHz
14.15 to 32.0 MHz
16.80 to 32.0 MHz
21.75 to 32.0 MHz
10 kW
Type Nos.
520G-1
520G-7
520G-10
520G-6
520G-2
520G-9
520G-8
520G-3
520G-11
520G-5
520G-4
520G-15
20 kW
Type Nos.
557-1
557-7
557-10
557-6
557-2
557-9
557-8
557-3
557-11
557-5
557-4
557-15
Lower Channel
2.0 to 3.5 MHz
2.0 to 4.75 MHz
2.0 to 5.55 MHz
2.0 to 7.30 MHz
2.0 to 8.15 MHz
2.0 to 9.55 MHz
2.0 to 11.25 MHz
2.0 to 12.5 MHz
2.0 to 12.85 MHz
2.0 to 13.4 MHz
2.0 to 18.35 MHz
2.0 to 14.1 MHz
Upper Channel
4.2 to 32.0 MHz
5.7 to 32.0 MHz
6.7 to 32.0 MHz
8.8 to 32.0 MHz
9.8 to 32.0 MHz
11.45 to 32.0 MHz
13.5 to 32.0 MHz
15.5 to 32.0 MHz
15.4 to 32.0 MHz
16.1 to 32.0 MHz
22.0 to 32.0 MHz
16.9 to 32.0 MHz
* Other frequencies are available on special order.
HF Receiving
Multicouplers
ASC Signal offers a range of passive
multicouplers which simply divide the
signal; the resultant 3 dB loss for each
split is in no way significant, since the
limiting atmospheric noise from the
antenna is also reduced.
Ordering Information
Characteristics
Frequency range, MHz
Input Impedance
Insertion loss (add 3 dB for each 2-way
split)
Model 356-1
Model 356-2
Model 356-3
Output Isolation
Input VSWR
Phase/Amplitude Balance
2-32 (usable 1.65-32)
50 ohms unbalanced, input/output
0.5 dB
0.7 dB
0.75 dB
30 dB
1.3:1 maximum
1°, 0.1 dB maximum
Bulletin 1533A 05/08 Data subject to change without notice.
Number of
Outputs
2
4
8
2.0-32 MHz Freq. Range
(1.65-32 Usable)
Type No.
356-1
50 ohm
356-2
BNC
356-3
Connectors
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ASC Signal Corporation • 606 Beech Street West • Whitby, Ontario, Canada • L1N 5S2 • t. +1 (905) 668 3348 • f. +1 (905) 668 8590 • www.ascsignal.com