HFNets - Revision history

Opadmin at 17:13, 2 June 2026

2026-06-02T17:13:33Z

← Older revision		Revision as of 13:13, 2 June 2026
Line 211:		Line 211:
	<td align="center">IL2P</td>		<td align="center">IL2P</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">7.~~099~~.15 MHz USB, 2000 Hz</td>		<td align="center">10.139.15 MHz USB, 2000 Hz</td>
	</tr>		</tr>

Opadmin at 22:56, 27 May 2026

2026-05-27T22:56:17Z

← Older revision		Revision as of 18:56, 27 May 2026
Line 79:		Line 79:
	<br>		<br>
	<br>		<br>
	These are proposed nets that allow the operator to retain a presence on the NET105/NET40/NET80 keyboard nets, while using audio tone selection to be able operate node hopping and mail forwarding in independent audio lanes. The main drawback to this is the increased co-channel interference brought on by wider bandwidth modes that all must fit in the ~~ADCS~~ subband.		These are proposed nets that allow the operator to retain a presence on the NET105/NET40/NET80 keyboard nets, while using audio tone selection to be able operate node hopping and mail forwarding in independent audio lanes. The main drawback to this is the increased co-channel interference brought on by wider bandwidth modes that all must fit in the ACDS subband.

	<div id="main">		<div id="main">
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	<br>		<br>

	The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the [https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-97/subpart-C/section-97.221 Part 97.221 ~~Automatic Digital Control Station~~] (~~ADCS~~) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ~~ADCS~~ range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run ARDOP, VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ~~ADCS~~ subband to allow legal automatic operation.		The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the [https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-97/subpart-C/section-97.221 Part 97.221 Automatically controlled digital station] (ACDS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ACDS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run ARDOP, VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ACDS subband to allow legal automatic operation.

	<div id="main">		<div id="main">

Opadmin at 22:46, 27 May 2026

2026-05-27T22:46:07Z

← Older revision		Revision as of 18:46, 27 May 2026
Line 148:		Line 148:
	<br>		<br>

	The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the Automatic Digital Control Station (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run ARDOP, VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.		The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the [https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-97/subpart-C/section-97.221 Part 97.221 Automatic Digital Control Station] (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run ARDOP, VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.

	<div id="main">		<div id="main">

Opadmin at 20:42, 27 May 2026

2026-05-27T20:42:27Z

← Older revision		Revision as of 16:42, 27 May 2026
Line 115:		Line 115:

	<tr>		<tr>
	<td align="center">~~OH71038IL2P3~~ (NET40)</td>		<td align="center">OH71038IL3 (NET40)</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.103.8 MHz</td>		<td align="center">7.103.8 MHz</td>
Line 148:		Line 148:
	<br>		<br>

	The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the Automatic Digital Control Station (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.		The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the Automatic Digital Control Station (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run ARDOP, VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.

	<div id="main">		<div id="main">
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	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">10.139.15 MHz USB, 1000 Hz (Recommended) \| 10.141.85 MHz LSB, 1700 Hz</td>		<td align="center">10.139.15 MHz USB, 1000 Hz (Recommended) \| 10.141.85 MHz LSB, 1700 Hz</td>
			</tr>


			<tr>
			<td align="center">OH1014065A5</td>
			<td align="center">30M</td>
			<td align="center">10.140.65 MHz</td>
			<td align="center">Various</td>
			<td align="center">ARDOP (500 Hz)</td>
			<td align="center">Intrastate Forwarding</td>
			<td align="center">10.139.15 MHz USB, 1500 Hz (Fixed)</td>
	</tr>		</tr>

	<tr>		<tr>
	<td align="center">~~OH1014065M~~</td>		<td align="center">OH1014065M5</td>
	<td align="center">30M</td>		<td align="center">30M</td>
	<td align="center">10.140.65 MHz</td>		<td align="center">10.140.65 MHz</td>
Line 184:		Line 195:

	<tr>		<tr>
	<td align="center">~~OH1014065M~~</td>		<td align="center">OH1014065V5</td>
	<td align="center">30M</td>		<td align="center">30M</td>
	<td align="center">10.140.65 MHz</td>		<td align="center">10.140.65 MHz</td>
Line 214:		Line 225:

	<tr>		<tr>
	<td align="center">~~OH710065M~~</td>		<td align="center">OH710065A5</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.100.65 MHz</td>		<td align="center">7.100.65 MHz</td>
	<td align="center">Various</td>		<td align="center">Various</td>
	<td align="center">~~Mercury~~ (500 Hz)</td>		<td align="center">ARDOP (500 Hz)</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">7.099.15 MHz USB, 1500 Hz (Fixed)</td>		<td align="center">7.099.15 MHz USB, 1500 Hz (Fixed)</td>
Line 224:		Line 235:

	<tr>		<tr>
	<td align="center">~~OH710065V~~</td>		<td align="center">OH710065M5</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.100.65 MHz</td>		<td align="center">7.100.65 MHz</td>
	<td align="center">Various</td>		<td align="center">Various</td>
	<td align="center">~~VARA HF~~ (500 Hz)</td>		<td align="center">Mercury (500 Hz)</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">7.099.15 MHz USB, 1500 Hz (Fixed)</td>		<td align="center">7.099.15 MHz USB, 1500 Hz (Fixed)</td>
Line 234:		Line 245:

	<tr>		<tr>
	<td align="center">~~OH710015IL3~~</td>		<td align="center">OH710065V5</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.~~101~~.15 MHz</td>		<td align="center">7.100.65 MHz</td>
	<td align="center">~~300 Baud~~</td>		<td align="center">Various</td>
	<td align="center">~~IL2P~~</td>		<td align="center">VARA HF (500 Hz)</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">7.099.15 MHz USB, ~~2000~~ Hz</td>		<td align="center">7.099.15 MHz USB, 1500 Hz (Fixed)</td>
	</tr>		</tr>

	<tr>		<tr>
	<td align="center">~~OH710015AX3~~</td>		<td align="center">OH710015IL3</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.101.15 MHz</td>		<td align="center">7.101.15 MHz</td>
Line 264:		Line 275:

	<tr>		<tr>
	<td align="center">~~OH359565M~~</td>		<td align="center">OH359565A5</td>
			<td align="center">80M</td>
			<td align="center">3.595.65 MHz</td>
			<td align="center">Various</td>
			<td align="center">ARDOP (500Hz)</td>
			<td align="center">Intrastate Forwarding</td>
			<td align="center">3.594.15 MHz USB, 1500 Hz (Fixed)</td>
			</tr>

			<tr>
			<td align="center">OH359565M5</td>
	<td align="center">80M</td>		<td align="center">80M</td>
	<td align="center">3.595.65 MHz</td>		<td align="center">3.595.65 MHz</td>
Line 274:		Line 295:

	<tr>		<tr>
	<td align="center">~~OH359565V~~</td>		<td align="center">OH359565V5</td>
	<td align="center">80M</td>		<td align="center">80M</td>
	<td align="center">3.595.65 MHz</td>		<td align="center">3.595.65 MHz</td>

Opadmin at 20:36, 27 May 2026

2026-05-27T20:36:22Z

← Older revision		Revision as of 16:36, 27 May 2026
Line 302:		Line 302:

	With the overarching goal of linking systems statewide, we must also employ antenna systems that favor [https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave NVIS] type propagation. In general, this means horizontal (usually wire) antennas 1/8-1/4w wavelength above the ground or magnetic loops which are oriented vertically. For those interested in actual field strength tests, [https://www.w8ji.com/nvis_n_v_i_s_antenna.htm W8JI's NVIS page] shows the height to performance numbers.		With the overarching goal of linking systems statewide, we must also employ antenna systems that favor [https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave NVIS] type propagation. In general, this means horizontal (usually wire) antennas 1/8-1/4w wavelength above the ground or magnetic loops which are oriented vertically. For those interested in actual field strength tests, [https://www.w8ji.com/nvis_n_v_i_s_antenna.htm W8JI's NVIS page] shows the height to performance numbers.
	For a quick reference, here are optimal antenna heights per band. Conventional wisdom suggest NVIS primarily happens below about 10 MHz, though [https://ohiopacket.org/images/tmp/20M_NVIS.png real world testing] with a vertical magnetic loop at 3ft above the ground has yielded contacts well beyond groundwave, but well within NVIS ranges. More experimentation may be needed to test it's feasibility on modes which require stronger signals.		For a quick reference, here are optimal antenna heights per band.

	<div id="main">		<div id="main">
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	</table>		</table>
	</div>		</div>

			Conventional wisdom suggest NVIS primarily happens below about 10 MHz, though [https://ohiopacket.org/images/tmp/20M_NVIS.png real world observation] on 20m with a vertical magnetic loop at 3ft above the ground has yielded contacts well beyond groundwave, but far too short for lower angle skywave, leaving us well within NVIS ranges. More experimentation may be needed to test it's feasibility on modes which require stronger signals.

Opadmin at 20:32, 27 May 2026

2026-05-27T20:32:35Z

← Older revision		Revision as of 16:32, 27 May 2026
Line 79:		Line 79:
	<br>		<br>
	<br>		<br>
	These are proposed nets that allow the operator to retain a presence on the NET105/NET40/NET80 keyboard nets, while using audio tone selection to be able operate node hopping and mail forwarding in independent audio lanes. The main drawback to this is the increased ~~cochannel~~ interference brought on by wider bandwidth modes that all must fit in the ADCS subband.		These are proposed nets that allow the operator to retain a presence on the NET105/NET40/NET80 keyboard nets, while using audio tone selection to be able operate node hopping and mail forwarding in independent audio lanes. The main drawback to this is the increased co-channel interference brought on by wider bandwidth modes that all must fit in the ADCS subband.

	<div id="main">		<div id="main">

Opadmin at 20:31, 27 May 2026

2026-05-27T20:31:25Z

← Older revision		Revision as of 16:31, 27 May 2026
Line 1:		Line 1:
	<h1>HF Nets</h1>		<h1>HF Nets</h1>
	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. It is also possible to run multiple, concurrent modems as long as their audio pass range fits within the radio's SSB filter. These ranges can vary, but generally runs around 300-3000 Hz. 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 sideband selection 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 using USB. Traditionally, AX.25 HF packet was LSB by convention, but can support both. For those running hardware based TNCs that do not support IL2P and have fixed tones at 1600:1800 Hz (1700 Hz center), LSB frequencies are provided.		The following index has been created to track various efforts to utilize the HF bands for packet activity. There are some existing nets 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. It is also possible to run multiple, concurrent modems as long as their audio pass range fits within the radio's SSB filter. These ranges can vary, but generally runs around 300-3000 Hz. 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 sideband selection 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 using USB. Traditionally, AX.25 HF packet was LSB by convention, but can support both. For those running hardware based TNCs that do not support IL2P and have fixed tones at 1600:1800 Hz (1700 Hz center), LSB frequencies are provided.

	<div id="main">		<div id="main">
Line 76:		Line 76:
	</table>		</table>
	</div>		</div>

			<br>
			<br>
			These are proposed nets that allow the operator to retain a presence on the NET105/NET40/NET80 keyboard nets, while using audio tone selection to be able operate node hopping and mail forwarding in independent audio lanes. The main drawback to this is the increased cochannel interference brought on by wider bandwidth modes that all must fit in the ADCS subband.

	<div id="main">		<div id="main">
Line 144:		Line 148:
	<br>		<br>

	The following ~~networks~~ are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the Automatic Digital Control Station (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.		The following nets are intentionally too far away in frequency to be compatible with NET105/NET40/NET80. The frequencies/tones selected exist just inside the Automatic Digital Control Station (ADCS) band edges in an effort to minimize co-channel interference. The dial frequencies are outside the ADCS range, but the audio tones are inside the range. Remote/unattended stations may wish to permanently reside here while local/attended may choose to QSY here for forwarding only. If you choose to run VARA and/or Mercury HF modems on the proposed dial frequencies, it is ''imperative'' that the bandwidth is limited to 500 Hz. This preserves the 250 Hz buffer between AX.25/FX.25 space tone (1100 Hz) and IL2P mark tone (1900 Hz). More importantly, it keeps the VARA and/or Mercury HF modems within the ADCS subband to allow legal automatic operation.

	<div id="main">		<div id="main">
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	<td align="center">OH710015IL3</td>		<td align="center">OH710015IL3</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.101.05 MHz</td>		<td align="center">7.101.15 MHz</td>
	<td align="center">300 Baud</td>		<td align="center">300 Baud</td>
	<td align="center">IL2P</td>		<td align="center">IL2P</td>
Line 242:		Line 246:
	<td align="center">OH710015AX3</td>		<td align="center">OH710015AX3</td>
	<td align="center">40M</td>		<td align="center">40M</td>
	<td align="center">7.101.05 MHz</td>		<td align="center">7.101.15 MHz</td>
	<td align="center">300 Baud</td>		<td align="center">300 Baud</td>
	<td align="center">IL2P</td>		<td align="center">IL2P</td>
Line 252:		Line 256:
	<td align="center">OH359515AX3</td>		<td align="center">OH359515AX3</td>
	<td align="center">80M</td>		<td align="center">80M</td>
	<td align="center">3.595.05 MHz</td>		<td align="center">3.595.15 MHz</td>
	<td align="center">300 Baud</td>		<td align="center">300 Baud</td>
	<td align="center">AX.25/FX.25</td>		<td align="center">AX.25/FX.25</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">3.~~595~~.15 MHz USB, 1000 Hz (Recommended) \| 3.596.85 MHz LSB, 1700 Hz</td>		<td align="center">3.594.15 MHz USB, 1000 Hz (Recommended) \| 3.596.85 MHz LSB, 1700 Hz</td>
	</tr>		</tr>

Line 266:		Line 270:
	<td align="center">Mercury (500Hz)</td>		<td align="center">Mercury (500Hz)</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">3.~~595~~.15 MHz USB, 1500 Hz (Fixed)</td>		<td align="center">3.594.15 MHz USB, 1500 Hz (Fixed)</td>
	</tr>		</tr>

Line 276:		Line 280:
	<td align="center">VARA HF (500Hz)</td>		<td align="center">VARA HF (500Hz)</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">3.~~595~~.15 MHz USB, 1500 Hz (Fixed)</td>		<td align="center">3.594.15 MHz USB, 1500 Hz (Fixed)</td>
	</tr>		</tr>

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	<td align="center">OH359615IL3</td>		<td align="center">OH359615IL3</td>
	<td align="center">80M</td>		<td align="center">80M</td>
	<td align="center">3.~~595~~.05 MHz</td>		<td align="center">3.596.05 MHz</td>
	<td align="center">300 Baud</td>		<td align="center">300 Baud</td>
	<td align="center">IL2P</td>		<td align="center">IL2P</td>
	<td align="center">Intrastate Forwarding</td>		<td align="center">Intrastate Forwarding</td>
	<td align="center">3.~~595~~.15 MHz USB, 2000 Hz</td>		<td align="center">3.594.15 MHz USB, 2000 Hz</td>
	</tr>		</tr>

Opadmin at 20:21, 27 May 2026

2026-05-27T20:21:38Z

← Older revision		Revision as of 16:21, 27 May 2026
Line 1:		Line 1:
	<h1>HF ~~Networks~~</h1>		<h1>HF Nets</h1>
	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. It is also possible to run multiple, concurrent modems as long as their audio pass range fits within the radio's SSB filter. These ranges can vary, but generally runs around 300-3000 Hz. 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 sideband selection 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 using USB. Traditionally, AX.25 HF packet was LSB by convention, but can support both. For those running hardware based TNCs that do not support IL2P and have fixed tones at 1600:1800 Hz (1700 Hz center), 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. It is also possible to run multiple, concurrent modems as long as their audio pass range fits within the radio's SSB filter. These ranges can vary, but generally runs around 300-3000 Hz. 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 sideband selection 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 using USB. Traditionally, AX.25 HF packet was LSB by convention, but can support both. For those running hardware based TNCs that do not support IL2P and have fixed tones at 1600:1800 Hz (1700 Hz center), LSB frequencies are provided.

	<div id="main">		<div id="main">
	<table valign="TOP" border="1">		<table valign="TOP" border="1">
	<caption><h1>Current HF Packet ~~Networks~~</h1></caption>		<caption><h1>Current HF Packet Nets</h1></caption>
	<tr>		<tr>
	<td align="center">Name</td>		<td align="center">Name</td>
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	<div id="main">		<div id="main">
	<table valign="TOP" border="1">		<table valign="TOP" border="1">
	<caption><h1>Proposed/Experimental HF Packet ~~Networks~~</h1></caption>		<caption><h1>Proposed/Experimental HF Packet Nets</h1></caption>
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	<td align="center">Name (Compatible NET)</td>		<td align="center">Name (Compatible NET)</td>
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	<caption><h1>Proposed/Experimental HF Mixed Mode ~~Networks~~</h1></caption>		<caption><h1>Proposed/Experimental HF Mixed Mode Nets</h1></caption>
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	<td align="center">Name</td>		<td align="center">Name</td>
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	With the overarching goal of linking systems statewide, we must also employ antenna systems that favor [https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave NVIS] type propagation. In general, this means horizontal (usually wire) antennas 1/8-1/4w wavelength above the ground or magnetic loops which are oriented vertically. For those interested in actual field strength tests, [https://www.w8ji.com/nvis_n_v_i_s_antenna.htm W8JI's NVIS page] shows the height to performance numbers.		With the overarching goal of linking systems statewide, we must also employ antenna systems that favor [https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave NVIS] type propagation. In general, this means horizontal (usually wire) antennas 1/8-1/4w wavelength above the ground or magnetic loops which are oriented vertically. For those interested in actual field strength tests, [https://www.w8ji.com/nvis_n_v_i_s_antenna.htm W8JI's NVIS page] shows the height to performance numbers.
	For a quick reference, here are optimal antenna heights per band. Conventional wisdom suggest NVIS primarily happens below about 10 MHz, though [https://ohiopacket.org/images/tmp/20M_NVIS.png real world testing] with a vertical magnetic loop at ~~3fe~~ above the ground has yielded contacts well beyond groundwave, but well within NVIS ranges. More experimentation may be needed to test it's feasibility on modes which require stronger signals.		For a quick reference, here are optimal antenna heights per band. Conventional wisdom suggest NVIS primarily happens below about 10 MHz, though [https://ohiopacket.org/images/tmp/20M_NVIS.png real world testing] with a vertical magnetic loop at 3ft above the ground has yielded contacts well beyond groundwave, but well within NVIS ranges. More experimentation may be needed to test it's feasibility on modes which require stronger signals.

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Opadmin at 20:18, 27 May 2026

2026-05-27T20:18:36Z

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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 WA8LMF's excellent article] on their relationship.  It is also possible to run multiple, concurrent modems as long as their audio pass range fits within the radio's SSB filter.  These ranges can vary, but generally runs around 300-3000 Hz.  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 sideband selection 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 using USB.  Traditionally, AX.25 HF packet was LSB by convention, but can support both.  For those running hardware based TNCs that do not support IL2P and have fixed tones at 1600:1800 Hz (1700 Hz center), LSB frequencies are provided.  With the overarching goal of linking systems statewide, we must also employ antenna systems that favor [https://en.wikipedia.org/wiki/Near_vertical_incidence_skywave NVIS] type propagation.  In general, this means horizontal wire antennas 1/8-1/4w wavelength above the ground or magnetic loops which are oriented vertically.
+<h1>HF Networks</h1>
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-<caption><h1>Proposed/Experimental HF Mixedmode Networks</h1></caption>
+<caption><h1>Proposed/Experimental HF Mixed Mode Networks</h1></caption>
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 <td align="center">Name</td>
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Opadmin at 18:55, 27 May 2026

2026-05-27T18:55:39Z

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