Digital Modes Frequencies
The following information has been gleaned from a number of sources, not all of them authoritative.
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)
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|