Skip to Content

Frequencies

Current HF Propogation Prediction


The above map can be used as a guide to NVIS ionospheric frequency support and is updated at approximately 40 minutes past the hour.


 

 

APRS capable Satellites

The satellites listed below have APRS Digipeating capability.

ISS (International Space Station)

  • Frequency: 145.825 MHz,  1200bps
  • Digipeater Aliases:  ARISS,  RS0ISS-4
  • Website

Current Location (You will need to manually refresh this page)


NO-44 (PCSAT)

  • Frequency: 145.825 MHz,  1200bps
  • Digipeater Aliases:  ARISS,  PCSAT-11
  • Website

Current Location (You will need to manually refresh this page)

 

HF NET Stations

What is a NET Station?

HF Net stations are used as reference stations when tuning equipment prior to use. Net stations identify themselves with a beacon at 5 minute intervals, to ensure that users have a known reference to tune to.

How do we use them?

Net stations are configured with a special alias of TUNE. This alias acts as a digipeater, but ONLY for the purpose of alignment tests. Whilst a HF setup is being aligned, the user can set a beacon rate much higher than the standard 10 minute interval, and transmit via the TUNE digi. When the frequency alignment is correct, the user will be able to hear the digipeated packet. The highest and lowest frequency that the packet is digipeated at can be split to find the middle of the passband of the net station. At this point, the beacon rate and path must be returned to normal.

Who are the NET stations?

The HF Net stations for each band are:

40m

  • Primary NET Station - VK5LY-4
  • Secondary Net StationVK2IO-4

30m

  • Primary NET Station – VK3MY-4
  • Secondary Net Station - VK4DMI-4

20m

  • Primary NET Station - VK2IO-4
  • Secondary Net Station -

 

HF Modem Tones

Popular Modem Offsets

The table below lists the common HF modem/TNC equipment in use, and thier tones.
These have been are categorised into "Groups" for the purpose of carrier frequency selection

Modem / TNC
Tone Frequencies
Group "A"
Bell 103 Originate
1070
1270
Group "B"
Tigertronics TM1
1100
1300
Group "C"
MFJ-1270 & MFJ-1270b
1600
1800
TinyTrack 3 & 4
1600
1800
Kam Plus
1600
1800
PacComm TNC320 1600 1800
OpenTracker 1600 1800
Group "D"
Bell 103 Answer
2025
2225
Group "E"
AGWPE (Soundcard)
2100
2300
MixW (Soundcard)
2100
2300
Group "F"
PK-232
2110
2310
MFJ-1270c & MFJ-1274c
2125
2295
MFJ-1276 & MFJ-1278
2125
2295
Group "G"
DSP-12
2125
2325

HF APRS Frequencies

APRS HF Frequencies

The table below lists the dial frequency to be used for various groups of HF modem equipment. Both LSB and USB are listed for reference, however in Australia only the column indicated in RED is used. Dial frequencies are usually quoted assuming the 1600/1800 Hz tone pair (Group C).

Band
Tone Frequencies

Dial Frequency
LSB / USB

40m
1070/1270 (Group A)
7035.47
7033.13
1100/1300 (Group B)
7035.50
7033.10
1600/1800 (Group C)
7036.00
7032.60
2025/2225 (Group D)
7036.425
7032.175
2100/2300 (Group E)
7036.50
7032.10
2110/2310 (Group F)
7036.51
7032.09
2125/2325 (Group G)
7036.515
7032.075
 
30m
1070/1270 (Group A)
10150.47
10148.13
1100/1300 (Group B)
10150.50
10148.10
1600/1800 (Group C)
10151.00
10147.60
2025/2225 (Group D)
10151.425
10147.175
2100/2300 (Group E)
10151.50
10147.10
2110/2310 (Group F)
10151.51
10147.09
2125/2325 (Group G)
10151.525
10147.075
 
20m
1070/1270 (Group A)
14102.47
14100.13
1100/1300 (Group B)
14102.50
14100.10
1600/1800 (Group C)
14103.00
14099.60
2025/2225 (Group D)
14103.425
14099.175
2100/2300 (Group E)
14103.50
14099.10
2110/2310 (Group F)
14103.51
14099.09
2125/2325 (Group G)
14103.525
14099.075

 

 

 

Syndicate content
Copyright