Examples

Note

It’s possible to build your own configurations manually, but it’s strongly recommended to use the visual editor at https://moas.m1st.co.uk/config. The built‑in validation helps prevent errors and makes the process far more reliable.

Several example configuration files are supplied with the server. It is easier to start with one of these files, even if it needs extensive changes, than to start from scratch.

2x6

This is a simple configuration. Six antennas are connected to a 2x6 switch. The antennas cover all frequencies.

Download this example (.moas)

flowchart
    R1[Radio 1]
    R2[Radio 2]
    2X6[2x6 Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT3:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT4:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT5:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT6:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }

    ANT1 --- 2X6
    ANT2 --- 2X6
    ANT3 --- 2X6
    ANT4 --- 2X6
    ANT5 --- 2X6
    ANT6 --- 2X6
    2X6 --- R1
    2X6 --- R2

    classDef ant fill:transparent,stroke:transparent

This example has all groups, but some of them have no information. It can be a good configuration to use as a template.

Small Station Configuration

This station has four antennas:

• Triband Yagi for 10, 15, 20
• All-band vertical
• 40 meter dipole (also usable on 15)
• 80 meter dipole

Download this example (.moas)

flowchart
    R1[Radio 1]
    R2[Radio 2]
    2X4[2x4 Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT2:::ant@{ img: "../../icons/hf_vertical.svg", label: "Vertical", h: 180 }
    ANT3:::ant@{ img: "../../icons/hf_dipole.svg", label: "40M Dipole", h: 48 }
    ANT4:::ant@{ img: "../../icons/hf_dipole.svg", label: "80M Dipole", h: 48 }

    ANT1 --- 2X4
    ANT2 --- 2X4
    ANT3 --- 2X4
    ANT4 --- 2X4
    2X4 --- R1
    2X4 --- R2

    classDef ant fill:transparent,stroke:transparent

The antennas are connected to a 2x4 switch, with bandpass filters attached. It is capable of SO2R operation.

The Swap function has also been configured for this station. When selected on either station, it swaps the antennas. It is only available if the antennas can actually be swapped. It is useful if one station is using the beam and one is using the vertical, and the operator finds a pile-up on the vertical that they need the beam to break.

Small Station Override Configuration

This station has the same antennas as the Small Station. The configuration uses overrides to allow a radio to take the antenna which the other radio is using. This eliminates the need for the swap function.

Download this example (.moas)

Big Station Configuration

This station has three 4-squares, thirteen yagis, and three beverages:

• 160 – 4-square
• 80 – 4-square
• 40 – 3 element rotatable yagi, 4-square
• 20 – 4/4/4 yagi stack (top rotatable), 5 element rotatable yagi
• 15 – 6/4/4 yagi stack (top rotatable), 4 element rotatable yagi
• 10 – 5/5/5 yagi stack (all rotatable), 7 element rotatable yagi

There are also NE, S, and W beverages usable on 160 and 80 meters.

Download this example (.moas)

flowchart
    R1[Radio 1]
    R2[Radio 2]
    2X6[2x6 Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT3:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT4:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    2SW[2-way Switch]
    3SW[3-way Switch]
    SM[StackMatch]
    4SQ[4 Square]

    4SQ --- 2X6
    2SW --- 2X6
    2X6 --- R1
    2X6 --- R2
    2SW --- ANT1
    2SW --- SM
    BEV1[Beverage 1] --- 3SW
    BEV2[Beverage 2] --- 3SW
    BEV3[Beverage 3] --- 3SW
    SM --- ANT2
    SM --- ANT3
    SM --- ANT4

    classDef ant fill:transparent,stroke:transparent

The illustration shows the 160 and 10 meter antenna systems and the beverages. Other antennas are similar.

The beverages are receive-only antennas. It is not necessary to press the RX button before selecting one.

The beverages are connected to a single coax, so only one is available at a time. They can be shared between the stations. When antennas are shared, changing the antenna for one station also changes it for the other. A station that is not using a shared antenna cannot change which antenna the other station is using. It must first start using the antenna, and then it can change it. This behaviour is a bit odd, but the alternative would be that starting to use an antenna would also change it for the existing user, which is also odd.

This example shows the Store and Recall function that remembers an antenna and returns to it. For example, when running Europe, the NE 4-square / NE beverage combination would likely be stored so it can be quickly recalled after picking off a Caribbean multiplier.

The stacks on 20, 15, and 10 use a combination of additive and exclusive antenna selection. It is not possible to turn off all of the antennas in the stacks. Attempts to do so will be ignored.

There is no way to select additive antennas with the knob client, so it has all seven combinations of antennas for the stack. This example also shows electrical rotators for the 4-squares on 160, 80, and 40.

Tribander Stack Configuration

This is part of a station (antennas for 40, 80, and 160 are not in the configuration). The antennas consist of:

• A stack of three tribanders (top rotatable)
• A separate tribander (rotatable)

The tribanders are connected to a microHam micro STACK SWITCH™.

Download this example (.moas)

flowchart
    R1[Radio 1]
    R2[Radio 2]
    2X10[2x10 Switch]
    MS[micro STACK Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT3:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    ANT4:::ant@{ img: "../../icons/antenna.svg", label: "Antenna", h: 48 }
    
    ANT1 --- MS
    ANT2 --- MS
    ANT3 --- MS
    MS-- Main ---2X10
    MS-- Sub ---2X10
    ANT4 --- 2X10

    2X10 --- R1
    2X10 --- R2

    classDef ant fill:transparent,stroke:transparent

This switch is different from the common StackMatch because it has two feeds. The main feed has an impedance matching transformer and can connect to one, two, or all three tribanders. The sub feed has no matching network and can connect to one antenna at a time.

Either radio can be connected to the main or sub feed through the 2x10 switch.

If each radio is using one tribander, it does not matter which is using the main and which is using the sub feeds. However, if one station uses two tribanders, it must have the main feed. This may require swapping which radio has which feed. The server does this automatically. This can be observed by watching the server’s log window when switching which station has two tribanders.

Note

There are several relay combinations that connect an antenna to a feed with this switch. microHam provides a chart showing which combinations have the lowest SWR. The issue is apparently not with impedance matching but with RF paths within the switch. This configuration uses combinations that avoid switching relays that affect the other radio.

These combinations may not have the lowest SWR in all cases.

Multi-Multi 20 Configuration

This station has eight yagis and a 4-square on 20 meters:

• 5/5/5 Europe stack – switchable angles 7°, 17°, 24°, 34°
• 5 element rotatable above Europe stack, can be phased with stack
• 6 element rotatable
• 5 element fixed on Africa
• 5/5 stack fixed on South America, both antennas fed in phase
• 4-square

The switching arrangement is complicated.

Download this example (.moas)

flowchart
    
    subgraph radios[ ]
    R1[Radio 1]
    R2[Radio 2]
    end

    PB[Phasing Box]
    MS1[micro STACK Switch]
    MS2[micro STACK Switch]
    2SW[2-way Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "5ele Rotatable", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "5/5/5 EU Stack", h: 48 }
    ANT5:::ant@{ img: "../../icons/antenna.svg", label: "5ele AF", h: 48 }
    ANT6:::ant@{ img: "../../icons/antenna.svg", label: "5/5 SA Stack", h: 48 }
    ANT8:::ant@{ img: "../../icons/antenna.svg", label: "6ele Rotable", h: 48 }
    4SQ[4 Square]

    ANT1 --- MS1
    ANT2 --- PB
    ANT5 --- MS1
    ANT6 --- MS2
    ANT8 --- MS2
    PB --- MS1
    MS1 --- MS2
    2SW --- MS2

    MS2 --- R1
    2SW --- R2
    4SQ --- 2SW
    
    classDef sub fill:transparent,stroke:transparent
    classDef ant fill:transparent,stroke:transparent
    class radios sub;

This is configured as one station with two radios to make it easy to demonstrate using one copy of a logging program. Normally it would be two stations, each with one radio. This is a simple change in the Stations list in the configuration file.

The stack switches are used to combine antenna systems. The station can transmit in several directions at once. The ability to select so many antennas creates a large number of choices – station 1 can select one of 78 combinations.

The two stations do not have the same antenna capabilities. Station 1 is connected to the main feed of the switch and can combine antennas that station 2, which is connected to the sub feed cannot. The result is that the 6-el and Africa antennas are additive on station 1 but exclusive on station 2. Also, only station 2 has access to the 4-square array.

There is no visible difference between an additive and an exclusive button. This is a compromise between showing everything the operator might want to know and showing so much information that the operator cannot quickly figure out what to do.

The ability to double-click or long-press an antenna to select it exclusively is valuable with this system.

The Europe stack has four exclusive selections but the antenna system itself is additive because it can be combined with the 5 element yagi and the Africa antenna. Therefore the Europe stack buttons have a slight additive capability: if the Europe stack is selected and another antenna is also selected, pressing the selected Europe stack button will deselect the Europe stack.

The Swap function is only available on station 1 because station 2 has more antenna buttons. If this is a significant problem the configuration could be changed.

The knob client cannot select all of the antenna combinations. The configuration gives it a limited set.

Triplexer Configuration

This is an expansion of the Tribander Stack Configuration. The difference is that a triplexer was added to the main coax:

The triplexer allows both stations to use the same antennas.

Download this example (.moas)

flowchart
    
    subgraph radios[ ]
    R1[Radio 1]
    R2[Radio 2]
    end

    MS1[micro STACK Switch]
    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Tribander Stack", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    T[Triplexer]
    2x10[2x10 Switch]

    ANT1 --- MS1-- Main ---T
    ANT2 --- 2x10

    T-- 20 ---2x10
    T-- 15 ---2x10
    T-- 10 ---2x10
    MS1-- Sub ---2x10

    2x10 --- R1
    2x10 --- R2
    
    classDef sub fill:transparent,stroke:transparent
    classDef ant fill:transparent,stroke:transparent
    class radios sub;

The server handles this system by using two modes. In unshared mode, it behaves just like the Tribander Stack configuration above. In shared mode, both stations are connected through the triplexer to the main feed on the stack switch. This requires that neither station be transmitting when the stack configuration is changed. It also means that a station cannot transmit on one stack configuration and receive on another. The switch enforces these restrictions automatically.

MS With One Amplifier

This is a station set up for SO2R or for ARRL Multi-Single. The station has a couple tribanders, a shorty-forty, an 80 meter dipole, a 160 inverted-L, and an all-band vertical.

Download this example (.moas)

flowchart
    
    subgraph radios[ ]
    R1[Radio 1]
    R2[Radio 2]
    end

    ANT1:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT2:::ant@{ img: "../../icons/antenna.svg", label: "Tribander", h: 48 }
    ANT3:::ant@{ img: "../../icons/antenna.svg", label: "40M Beam", h: 48 }
    ANT4:::ant@{ img: "../../icons/hf_dipole.svg", label: "80M Dipole", h: 48 }
    ANT5:::ant@{ img: "../../icons/hf_vertical.svg", label: "Vertical", h: 180 }
    ANT6:::ant@{ img: "../../icons/hf_dipole.svg", label: "160M Inverted V", h: 48 }
    2X2_1[2x2]
    2X2_2[2x2]
    AMP[Amplifier]
    2X6[2x6 Switch]

    ANT1 --- 2X6
    ANT2 --- 2X6
    ANT3 --- 2X6
    ANT4 --- 2X6
    ANT5 --- 2X6
    ANT6 --- 2X6

    2X6 --- 2X2_1 --- 2X2_2 --- R1
    2X6 --- 2X2_1 --- AMP
    AMP --- 2X2_2
    2X2_2 --- R2
        
    classDef sub fill:transparent,stroke:transparent
    classDef ant fill:transparent,stroke:transparent
    class radios sub;

There are several interesting things about this station:

• It has only one amplifier. The amplifier is solid-state and can change bands quickly. It can be switched to the transmitting station through the two 2x2 switches. The band is set using Yaesu-style encoding. The band and T/R relay are controlled by MOAS.
• Both stations can operate on the same band (except on 160). There is enough isolation between the antennas except on 20 if both stations are using the tribanders. In this case, when one station transmits, the other is automatically connected to the vertical.
• There is a pair of LEDs that turn on when each radio transmits. This is for use in multi-single, where it is useful to know when you can transmit and when you cannot. For multi-single, the configuration is modified so radio 2 inhibits radio 1 but not the other way around, giving radio 2 priority for calling multipliers.