Mel, Thank you very much for your comment.
I found the reason why R3 IARU picked up 14130kHz. It comes from R1 IARU band plan and the confusion comes from the fact R2 IARU does not define 20m CoA even ARRL suggests 14236kHz as you pointed out. The following is the list of R1 and R2 recommendation. https://www.iaru-r2.org/en/on-the-air/band-plans/ R1 3630kHz 7070kHz 14130kHz 18150kHz 21180kHz 24960kHz R2 7070kHz So, it seems it is ok to use both 14130kHz and 14236kHz by each region until IARU harmonizes them. I noticed 17m CoA are different between R1 (18150kHz) and R3(18160kHz). I suspect R3 CoA is a typo and I will check it with IARU R3 secretary. I forgot to mention the hiden motivation why we have active discussion here is that it is hard to find freedv operation frequency in the crowded SSB incumbent PHONE segment where freedv is forced to work by IARU and Japanese regulation body band plans. Therefore, it may be politically wise to use IARU defined CoAs to claim they are our frequencies. See the following IARU R3 bandplan definitions. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Phone: Phone operation includes, SSB, DSB AM, FM and Digital Voice modes with similar bandwidth not exceeding 6 kHz. On 50 MHz and above, the maximum bandwidth not exceed 25 kHz Digital Voice: Any mode based on digital encoded voice, restricted to the specified bandwidth and application of the frequency segment. The non-voice digital embedded content must be an ancillary data, not the main purpose of the communication, except during emergency communications. Digital Voice users should first check if the channel is already in use by other stations and modes (including analog) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- I welcome other readers comments for our further works. Regards, take de JA5AEA Windows 10 版のメール<https://go.microsoft.com/fwlink/?LinkId=550986>から送信 差出人: Mel Whitten<mailto:[email protected]> 送信日時: Monday, June 15, 2020 12:13 PM 宛先: [email protected]<mailto:[email protected]> 件名: Re: [Freetel-codec2] Center Of Activity in Japan Take, I believe John, K7VE might consider adding R3 IARU recommended frequencies to his QSO Finder. However, 14.236 HF DV use goes way back before FreeDV (over 20 years ago).and I would not be in favor of changing this long standing DV waterhole. In addition, the “Considerate Operator’s Frequency Guide” published every year in QST and here http://www.arrl.org/files/file/conop.pdf lists 14.236 for Digital Voice. Mel K0PFX From: Tsutsumi Takehiko <[email protected]> Sent: Sunday, June 14, 2020 9:06 PM To: [email protected] Subject: [Freetel-codec2] Center Of Activity in Japan David, Greeting. Recently, we have active discussion of FreeDV operating frequencies based on the fact that Japanese regulation body allows the operation of Digital Voice on 160 meter from 1.845MHz to 1.875MHz and JA FreeDV activities have been increasing by 700D introduction. Then, I found IARU R3 band plans defines Digital Voice COA as follows. https://www.iaru-r2.org/wp-content/uploads/2020/02/IARU-Region-3-Band-plan.pdf CoA: “Centre of Activity” frequency (IARU recommended) 7070kHz, 14130kHz, 18160kHz, 21180kHz, 24960kHz, 28330kHz Digital Voice: Any mode based on digital encoded voice, restricted to the specified bandwidth and application of the frequency segment. The non-voice digital embedded content must be an ancillary data, not the main purpose of the communication, except during emergency communications. Digital Voice users should first check if the channel is already in use by other stations and modes (including analog) >From above information, I can say 1. We can respect IARU recommended CoA as our FreeDV operation frequency if IARU globally provides the protection to CoA FreeDV stations. 2. Unfortunately, R3 band plan does not include 80m and 160m CoAs. Therefore, we have the opportunity to provide the recommendation to IARU if we have common CoA of FreeDV. 3. Large discrepancy exists between IARU recommended CoAs and actual FreeDV operation frequencies such as “Presets” in FreeDV QSO Finder i.e. “28.7200, 24.9330, 21.3130, 18.1190, 14.2400, 14.2360, 7.1900, 7.1770, 5.4035, 3.8170, 3.7320, 1.9970”. Obviously, we have to recognize the local environments and can not exactly follow IARU recommended CoAs. For example, we can not operate 60m band and we can not operate above 1.875MHz at 160 meter band and therefore, 5.4035 and 1.9970 must be eliminated from CoA in Japan. 4. We have to examine which is better for JA FreeDV to prioritize IARU CoAs or FreeDV QSO Finder frequencies. So far, it looks like the decision can be made by JA FreeDV users but I wish to know the above items are satisfactory for you to start our discussion. I am happy to receive your comments soon. Regards, take de JA5AEA Windows 10 版のメール<https://go.microsoft.com/fwlink/?LinkId=550986>から送信
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