ARRL

21MHz Reference Circuit

 

High End 15 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)

21.2-21.45

Channel Spacing

Random

Information Rate

speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .6                  Receive: 0.6

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

17

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

48.1

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-153

Receiver Signal-to-Noise Ratio (dB)

+6

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

To be determined

Availability Target %

 

Maximum Path Length (km)

 

 

TH7 Stack p. 11-25 of the ARRL Antenna Book, 18th edition.

 

Typical 15 SSB contest station

 

 

Characteristics

 

Values

Frequency Band (MHz)

21.2-21.45

Channel Spacing

Random

Information Rate

speech

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .7                    Receive: 0.7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

15

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

46.0

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-153 

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 15 CW contest station

 

Characteristics

 

Values

Frequency Band (MHz)

21.0-21.2

Channel Spacing

Random

Information Rate

10 bit/sec

Emission Type(s)

100HA1A

Transmitter Power (dBW)

31.7

Transmission Line Loss (dB)

Transmit: .6                     Receive: 0.6

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

17

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

48.1

Receiver IF Bandwidth

CW:100 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-167

Receiver Signal-to-Noise Ratio (dB)

+1

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

To be determined

 

 

Maximum Path Length (km)

 

 

 

 

Typical 15 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: ..7                   Receive: 0.7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

15

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

46

Receiver IF Bandwidth

SSB:2500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-153

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

 

 

 

Typical 15 M CW Amateur Station

 

 

Characteristics

 

Values

Frequency Band (MHz)

21.0-21.2

Channel Spacing

Random

Information Rate

10 bit/s

Emission Type(s)

100HA1A

Transmitter Power (dBW)

20

Transmission Line Loss (dB)

Transmit: .7                   Receive: 0.7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

8

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

27.3

Receiver IF Bandwidth

CW:100Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-167

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 15 M Digital Amateur Station

 

 

 

Characteristics

 

Values

Frequency Band (MHz)

21.0-21.2

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: .7                Receive: .7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

15

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

46

Receiver IF Bandwidth

500

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-160

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 15 M Digital Amateur Station

 

 

Characteristics

 

Values

Frequency Band (MHz)

21.0-21.2

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: .7                  Receive: .7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

8

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

24.3

Receiver IF Bandwidth

500 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-160

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 15 M SSTV Amateur Station

 

The typical SSTV amateur station exchanges pictures with other stations.

 

Characteristics

 

Values

Frequency Band (MHz)

21.2-21.45

Channel Spacing

Random

Information Rate

.22 to 7.5 frames/sec

Emission Type(s)

2K50J3E

Transmitter Power (dBW)

30

Transmission Line Loss (dB)

Transmit: .7                Receive: .7

Antenna Polarization

Horizontal; Vertical

Antenna Maximum Gain (dBi)

12

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

41.3

Receiver IF Bandwidth

2500

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-153

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 15 M Beacon Amateur Station

 

Characteristics

 

Values

Frequency Band (MHz)

21.15

Channel Spacing

N/A

Information Rate

10 bit/s

Emission Type(s)

50HA1A

Transmitter Power (dBW)

20

Transmission Line Loss (dB)

Transmit:.7

Antenna Polarization

Vertical

Antenna Maximum Gain (dBi)

0

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

19.3

Receiver IF Bandwidth

100 Hz

Receiver Noise Figure (dB)

13

Receiver System Noise (dBW)

-167

Receiver Signal-to-Noise Ratio (dB)

+1

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

To be determined

 

 

Maximum Path Length (km)

depends on propagation mode

.

 

Typical 15 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)

21.2-21.45

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)

-5

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

-2

Receiver IF Bandwidth

2500 Hz

Receiver Noise Figure (dB)

7

Receiver System Noise (dBW)

-155

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 15 M Satellite Uplink

 

 

Characteristics

 

Values

Frequency Band (MHz)

21.0-21.45

Channel Spacing

Random

Information Rate

10 bit/s

Emission Type(s)

100HA1A; 2K50J3E

Transmitter Power (dBW)

14

Transmission Line Loss (dB)

Transmit:.0.7

Antenna Polarization

linear, circular

Antenna Maximum Gain (dBi)

8

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

21.3

Receiver IF Bandwidth

100 Hz

Receiver Noise Figure (dB)

7

Receiver System Noise (dBW)

-152,-138

Receiver Signal-to-Noise Ratio (dB)

+1;+6

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

To be determined

 

 

Maximum Path Length (km)

depends on propagation mode