HFNets: Difference between revisions
(Created page with "The following index has been created to track various efforts to utilize the HF bands for node hopping and mail forwarding. There are some existing networks that are primarily focused on casual operating, keyboard to keyboard messaging for personal mail delivery. Due to the nature of AFSK and SSB, it is possible to have many combinations of VFO dial frequency with audio tone selection. Please see http://wa8lmf.net/aprs/SSB_Frequencies.htm on their relationship. The t...") |
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The following index has been created to track various efforts to utilize the HF bands for node hopping and mail forwarding. There are some existing networks that are primarily focused on casual operating, keyboard to keyboard messaging for personal mail delivery. Due to the nature of AFSK and SSB, it is possible to have many combinations of VFO dial frequency with audio tone selection. Please see http://wa8lmf.net/aprs/SSB_Frequencies.htm on their relationship. The two most popular protocols are AX.25/FX.25 (compatible) and IL2P. The AX.25/FX.25 protocols use NRZI encoding, which means USB and LSB can communicate as long as the center frequencies match. The IL2P protocol uses NRZ encoding, which means sidebands must match. The seeming standard for HF IL2P seems to be USB, for compatibility reasons, it is suggested to run USB for both AX.25/FX.25 and IL2P. This also aligns with VARA, ARDOP and Mercury modems. Traditionally, AX.25 HF packet was LSB by convention. For those running hardware based TNCs that do not support IL2P, LSB frequencies are provided. | The following index has been created to track various efforts to utilize the HF bands for node hopping and mail forwarding. There are some existing networks that are primarily focused on casual operating, keyboard to keyboard messaging for personal mail delivery. Due to the nature of AFSK and SSB, it is possible to have many combinations of VFO dial frequency with audio tone selection. Please see [http://wa8lmf.net/aprs/SSB_Frequencies.htm WA8LMF's excellent article] on their relationship. The two most popular protocols are AX.25/FX.25 (compatible) and IL2P. The AX.25/FX.25 protocols use NRZI encoding, which means USB and LSB can communicate as long as the center frequencies match. The IL2P protocol uses NRZ encoding, which means sidebands must match. The seeming standard for HF IL2P seems to be USB, for compatibility reasons, it is suggested to run USB for both AX.25/FX.25 and IL2P. This also aligns with VARA, ARDOP and Mercury modems. Traditionally, AX.25 HF packet was LSB by convention. For those running hardware based TNCs that do not support IL2P, LSB frequencies are provided. | ||
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Revision as of 10:34, 27 May 2026
The following index has been created to track various efforts to utilize the HF bands for node hopping and mail forwarding. There are some existing networks that are primarily focused on casual operating, keyboard to keyboard messaging for personal mail delivery. Due to the nature of AFSK and SSB, it is possible to have many combinations of VFO dial frequency with audio tone selection. Please see WA8LMF's excellent article on their relationship. The two most popular protocols are AX.25/FX.25 (compatible) and IL2P. The AX.25/FX.25 protocols use NRZI encoding, which means USB and LSB can communicate as long as the center frequencies match. The IL2P protocol uses NRZ encoding, which means sidebands must match. The seeming standard for HF IL2P seems to be USB, for compatibility reasons, it is suggested to run USB for both AX.25/FX.25 and IL2P. This also aligns with VARA, ARDOP and Mercury modems. Traditionally, AX.25 HF packet was LSB by convention. For those running hardware based TNCs that do not support IL2P, LSB frequencies are provided.
| Name | Band | Center Frequency | Speed | Protocol | Usage/notes | Dial Frequency+Tone pairs |
| NET105 | 20M | 14.103.3 | 300 Baud | AX.25/FX.25 | Keyboard to Keyboard | 14.102.0 MHz USB, 1300 Hz (recommended) | 14.105.0 MHz LSB, 1700 Hz |
| NET105 | 20M | 14.104.3 | 300 Baud | IL2P | Keyboard to Keyboard | 14.102.0 MHz USB, 2300 Hz |
| NET40 | 40M | 7.102.3 MHz | 300 Baud | AX.25/FX.25 | Keyboard to Keyboard | 7.101.0 MHz USB, 1300 Hz (recommended) | 7.104.0 MHz LSB, 1700 Hz |
| NET40 | 40M | 7.103.3 MHz | 300 Baud | IL2P | Keyboard to Keyboard | 7.101.0 MHz USB, 2300 Hz |
| NET80 | 80M | 3.597.0 MHz | 300 Baud | AX.25/FX.25 | Keyboard to Keyboard | 3.596.0 MHz USB, 1000 Hz (recommended) | 3.598.7 MHz LSB, 1700 Hz |
| NET80 | 80M | 3.598.0 MHz | 300 Baud | IL2P | Keyboard to Keyboard | 3.597.0 MHz USB, 2000 Hz |