Automatic link establishment

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In HF radio, automatic link establishment is s mechanism for a station to make contact, or initiate a circuit, between itself and another specified radio station, without human intervention and usually under processor control.

ALE techniques include automatic signaling, selective calling, and automatic handshaking. Other automatic techniques that are related to ALE are channel scanning and selection, link quality analysis (LQA), polling, sounding, message store-and-forward, address protection, and anti-spoofing.

Optional ALE functions include polling and the exchange of orderwire commands and messages. Amateur Radio (Ham Radio) also uses Automatic Link Establishment (ALE).

[edit] International Amateur Radio Automatic Link Establishment Network

The International Amateur Radio ALE Network is the world's largest open ALE network. The Channel List for this High Frequency ALE net is frequency coordinated with all IARU Regions (International Amateur Radio Union) for international, regional, and local use in the Amateur Radio Service. All Amateur Radio ALE channels use "USB" Upper Sideband. All channels are subject to the different rules, regulations, and bandplans of the region and local country of operation. Some channels or modes in the list may not be available in every country. This ham radio ALE network is an open net, and invites all ham radio operators and ham radio nets worldwide to participate in ALE and share the same ALE channels.

CH# Frequency kHz Sideband Common Use Description IARU Region
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01- 1806.0 USB VOICE/DATA IARU R2,3 (Sounding R2,3)
02- 1840.5 USB VOICE/DATA IARU R1 (Sounding R1)
03- 1845.0 USB VOICE/DATA IARU R1,2,3
04- 1996.0 USB VOICE/DATA IARU R1,2,3
05- 3596.0 USB DATA/VOICE IARU R1,2,3 (Sounding R2)
06- 3617.0 USB DATA/VOICE IARU R1,3 (Sounding R1)
07- 3626.0 USB DATA/VOICE IARU R1 (Sounding R3)
08- 3791.0 USB VOICE =COMMON ALL IARU REGIONS=
09- 3996.0 USB VOICE IARU R2
10- 5371.5 USB VOICE IARU R1,3 (Emergency R2*)
11- 5403.5 USB VOICE IARU R1,3 (Emergency R2*)
12- 7030.5 USB DATA IARU R3 Asia (Sounding R3)
13- 7040.5 USB DATA IARU R1 (Sounding R1)
14- 7065.0 USB DATA/VOICE IARU R1,3
15- 7102.0 USB DATA/VOICE IARU R1,2,3 (Sounding R2)
16- 7185.5 USB VOICE =COMMON ALL IARU REGIONS
17- 7296.0 USB VOICE IARU R2,3
18- 10136.5 USB DATA/VOICE IARU R1,2,3
19- 10145.5 USB DATA =COMMON ALL IARU REGIONS(Sounding R1,2,3)
20- 14100.5 USB DATA IARU R1,2,3
21- 14109.5 USB DATA =COMMON ALL IARU REGIONS(Sounding R1,2,3)
22- 14342.5 USB VOICE =COMMON ALL IARU REGIONS
23- 14346.0 USB VOICE =COMMON ALL IARU REGIONS
24- 18106.0 USB DATA IARU R1,2,3 (Sounding R2,3)
25- 18117.5 USB VOICE/DATA =COMMON ALL IARU REGIONS(SoundingR1)
26- 18157.5 USB VOICE =COMMON ALL IARU REGIONS
27- 21117.5 USB DATA IARU R1,2,3 (Sounding R1,3)
28- 21157.5 USB DATA IARU R1,2,3 (Sounding R2)
29- 21437.5 USB VOICE =COMMON ALL IARU REGIONS
30- 24926.0 USB DATA IARU R1,2,2 (Sounding R1,2,3)
31- 24977.5 USB VOICE =COMMON ALL IARU REGIONS
32- 28117.5 USB DATA IARU R1,2,3 (Sounding R1)
33- 28146.0 USB DATA IARU R1,2,3 (Sounding R2,3)
34- 28327.5 USB VOICE =COMMON ALL IARU REGIONS
35- 50162.5 USB VOICE/DATA IARU R1,2,3 (Sounding R1,2,3)
36- 144162.5 USB VOICE/DATA IARU R1,2,3 (Sounding R1,2,3)

Amateur Radio ALE standards:

1. ALE System = MIL-STD 188-141 ; FED-1045 (8FSK, 2.2kHzBW)
2. Call or Sounding transmission duration: 30 seconds or less.
3. Scan rate: 1 or 2 channels per second.
4. Sounding Interval = 60 Minutes (or more) (for same channel)
5. CQ Call = NETCALL to "HFL" net (or "QRZ" on sounding channels)
6. Digi Texting Audio Centre Frequency= 1500HZ (to 1800HZ)
7. Short text messaging standard = AMD
8. TWS SOUNDING (Recommended)
9. "TWS" is always sent to clear link after ALLCALLS or LINKING.

Amateur Radio ALE NETCALLS always use 3 characters:

1. HFL = CQ, ALL AMATEUR RADIO ALE STATIONS (10 member slots)
2. HAM = EMERGENCY LIASON NET: AMATEUR TO NGO/GOV (10 member slots)
3. GPR = GEO POSITION REPORTS (3 member slots)
4. RPT = STATION STATUS REPORTS (3 member slots)
5. QRZ = OPEN RESPONSE NET ON SOUNDING CHANNELS (3 member slots)
6. CQA = RESERVED FOR FUTURE USE (3 member slots)

Amateur Radio ALE Timing Standards:

1. Tune Time (TT) max = 1 second (or 1045mSec)
2. Time Wait for Reply (TWR) max = 2 seconds (or 2048mSec)
3. Link Quality Analysis (LQA) time out = 3 hours (or 180 minutes)
4. Linked PTT Inactivity (TWA) time out = 6 minutes (or 360 seconds)

Info: This listing is current as of FEB2007. For more information about Amateur Radio ALE and updates of this channel list please see the website: HFLINK.COM

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