Digital Modes Frequencies

The following information has been gleaned from a number of sources, not all of them authoritative.

Update 19/4/2012!

As of March 2009, a new IARU Region 1 HF Band Plan was agreed. The main change was to increase the 40m allocation from 100KHz to 200KHz and to re-assigned the sub-bands within that allocation.

The RSGB Band Plan (as of 1/1/2012) can be found here. For 40m, this states that:

7 MHz (40m) Necessary Bandwidth UK Usage
7,000-7,040 kHz 200 Hz Telegraphy. 7,030 kHz – QRP Centre of Activity
7,040-7,047 500 Hz Narrow band modes (Note 2)
7,047-7,050 500 Hz Narrow band modes, automatically controlled data stations(unattended)
7,050-7,053 2.7 kHz All modes, automatically controlled data stations (unattended), (Note 1)
7,053-7,060 2.7 kHz All modes, digimodes
7,060-7,100 2.7 kHz All modes, SSB Contest Preferred Segment. digital voice 7,070kHz; SSB QRP Centre of Activity 7,090 kHz
7,100-7,130 2.7 kHz All modes, 7,110kHz – Region 1 Emergency Centre of Activiity.
7,130-7,200 2.7 kHz All modes, SSB Contest Preferred Segment; 7,165kHz – Image Centre of Activity
7,175-7,200 2.7 kHz All modes, priority for intercontinental operation

Note 1: Lowest LSB carrier frequency (dial setting) should be 7,053 kHz.
Note 2: PSK31 activity starts from 7,040kHz.
Since 2009, the narrow band modes segment starts at 7,040kHz.

LICENCE NOTES 7,000-7,100 kHz Amateur and Amateur Satellite Service – Primary User.
7,100-7,200 kHz Amateur Service – Primary User.

To abide by the new allocation, all digimode transmissions must be above 7.040 MHz. You will see that in the following tables, some of the allocated frequencies are below 7.040 MHz. I do not have definitive information regarding the new allocations, so I have italicised the current entries to mark them as being no longer recommended. However I have left them there as I have no alternatives. (Gareth, M5KVK)

DominoEX

160m 1.838.000
80m 3.580.000
40m 7.037.000
30m 10.147.000
20m 14.080.000
17m 18.105.000
15m 21.080.000
12m 24.929.000
10m 28.080.000

MFSK

160m 1.838.000
80m 3.580.000
40m 7.037.000
30m 10.147.000
20m 14.072-14.079
17m 18.105.000
15m 21.080.000
12m 24.929.000
10m 28.080.000

JT-65

160m 1.838.000
80m 3.576.00
40m 7.039.00
40m 7.076.00
30m 10.139.00
30m 10.147.00
20m 14.076.00
17m 18.102.00
17m 18.106.00
15m 21.076.00
12m 24.290.00
10m 28.076.00

Olivia 16/500

See http://hflink.com/olivia/#freqs for the official page. That page assumes that your Olivia decoder operates on a fixed audio centre frequency of 750Hz. This is true for the earlier decoders (e.g. that incorporated into HRD). The one in fldigi can operate anywhere in the audio spectrum, so it makes sense for it to be centred on 1500HZ,which is the centre of the filters on my IC-756ProII. Thus, the following table has the dial frequencies that correspond to a 1500Hz audio centre frequency.

Band Dial (FL-digi) Dial (HRD) Audio Centre
160m 1.807.75 1.808.500 1.809.250
80m 3.581.750 3.582.500 3.583.250
60m 5.366.500 5.367.250 5.368.000
40m 7.041.750 7.042.500 7.043.250
30m 10.141.75 10.142.500 10.143.250
20m 14.073.900 14.074.650 14.075.400
17m 18.101.900 18.102.650 18.103.400
15m 21.085.750 21.086.500 21.087.250
12m 24.921.250 24.922.000 24.922.750
10m 28.075.250 28.076.000 28.076.750

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