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