ARRL

7MHz Reference Circuit

 

High End 40 M SSB contest station

 

Competitive contest stations use big antennas in an effort to contact even the smallest and most remote stations.

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.3 Receive, 7.075-7.1 and 7.15-7.3 Transmit

Channel Spacing

Random

Information Rate

speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .3                  Receive: 0.3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

15

Maximum e.i.r.p. (dBW)

46.4

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-142

Receiver Signal-to-Noise Ratio (dB)

+6

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

Availability Target %

 

Maximum Path Length (km)

 

 

 

Big horizontally yagis are somewhat common--probably more common than vertical arrays among the elite contest stations.

 

Typical 40M SSB contest station

 

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.3 Receive,  7.075-7.1 and 7.15-7.3 Transmit

Channel Spacing

Random

Information Rate

speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .3                    Receive: 0.3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

12

Maximum e.i.r.p. (dBW)

43.4

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-142 

Receiver Signal-to-Noise Ratio (dB)

+6

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

Availability Target %

 

Maximum Path Length (km)

 

 

Shortened two element yagis are quite popular.

 

 High End 40 CW contest station

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.15

Channel Spacing

Random

Information Rate

10 bit/sec

Emission Type(s)

100HA1A

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .3                     Receive: 0.3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

15

Maximum e.i.r.p. (dBW)

46.4

Receiver IF Bandwidth

CW:100 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-156

Receiver Signal-to-Noise Ratio (dB)

+6

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

 

 

 

 

Typical 40 M SSB Amateur Station

 

The typical SSB amateur station communicates with other SSB using F layer propagation.

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.3 Receive, 7.075-7.1 and 7.15-7.3 Transmit

Channel Spacing

Random

Information Rate

Speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: ..3                    Receive: 0.3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

6

Maximum e.i.r.p. (dBW)

37.4

Receiver IF Bandwidth

SSB:2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-142

Receiver Signal-to-Noise Ratio (dB)

+6

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on propagation mode

 

Dipole at 60 ft

 

Typical 40M CW Amateur Station

 

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.15

Channel Spacing

Random

Information Rate

10 bit/s

Emission Type(s)

100HA1A

Transmitter Power (dBW)

20

Transmission Line Loss (dB)

Transmit: .3                   Receive: 0.3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

6

Maximum e.i.r.p. (dBW)

25.7

Receiver IF Bandwidth

CW:100Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-156

Receiver Signal-to-Noise Ratio (dB)

+1

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on propgation mode

 

Dipole at 30 ft

 

High End 40 M Digital Amateur Station

 

 

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.1

Channel Spacing

Random

Information Rate

45-300 bit/sec

Emission Type(s)

Many different types

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .3                 Receive: .3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

12

Maximum e.i.r.p. (dBW)

43.4

Receiver IF Bandwidth

500

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-149

Receiver Signal-to-Noise Ratio (dB)

+3

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on the propagation mode

 

 

 

Typical 40 M Digital Amateur Station

 

 

Characteristics

 

Values

Frequency Band (MHz)

7.0-7.1

Channel Spacing

Random

Information Rate

45-300 bit/sec, 0-300 bit/sec worst case

Emission Type(s)

Many different types

Transmitter Power (dBW)

17

Transmission Line Loss (dB)

Transmit: .3                   Receive: .3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

6

Maximum e.i.r.p. (dBW)

22.7

Receiver IF Bandwidth

500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-149

Receiver Signal-to-Noise Ratio (dB)

+3

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on propagation mode

 

Typical 40 M SSTV Amateur Station

 

The typical SSTV amateur station exchanges pictures with other stations.

 

Characteristics

 

Values

Frequency Band (MHz)

7.15-7.3

Channel Spacing

Random

Information Rate

.22 to 7.5 frames/sec

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

30

Transmission Line Loss (dB)

Transmit: .3                 Receive: .3

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

6

Maximum e.i.r.p. (dBW)

35.7

Receiver IF Bandwidth

2500

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-142

Receiver Signal-to-Noise Ratio (dB)

+30

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on propagation mode

 

 

 

Typical 40 M Beacon Amateur Station

N/A--There don’t appear to be any in operation.

 

Typical 40 M Hand-Held Amateur Station

 

The typical SSB hand-held amateur station can communicate with some other SSB voice amateur stations.

 

Characteristics

 

Values

Frequency Band (MHz)

7.075-7.1, 7.15-7.3

Channel Spacing

Random

Information Rate

speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

3

Transmission Line Loss (dB)

Transmit: .0                   Receive: 00

Antenna Polarization

Vertical

Antenna Maximum Gain (dBi)

-15

Maximum e.i.r.p. (dBW)

-12

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-142

Receiver Signal-to-Noise Ratio (dB)

+6

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

Availability Target %

 

Maximum Path Length (km)

 

 

Mizuho sell these little radios.

 

Typical 40 M AM station

 

 

Characteristics

 

Values

Frequency Band (MHz)

7.15-7.3

Channel Spacing

Random

Information Rate

Speech

Emission Type(s)

6K0A3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .3                  Receive: 0.3

Antenna Polarization

Horizontal

Antenna Maximum Gain (dBi)

6

Maximum e.i.r.p. (dBW)

37.4

Receiver IF Bandwidth

6 kHz

Receiver Noise Figure (dB)

7

Receiver System Noise (dBW)

-139

Receiver Signal-to-Noise Ratio (dB)

10

Maximum Long-Term Interference Power [dB(W/Hz)]       

To be determined

 

 

Maximum Path Length (km)

Depends on propagation mode