I listened in via a South Korean SDR shared on globaltuners.com to some of these transmissions. A couple of corrections to report:
On May 26th, V24 heard on 5715 at 1500, not 1430. (Per chobi.net log, this was the case on March 26 and April 26.)
On May 27th, V24 heard on 4900 at 1530. (Per chobi.net log, this was the case on March 27 and April 27.)
I forgot to check on May 28th, but the chobi.net log has them transmitting on 5715 at 1500 for March 28th and April 28th. They stopped logging back on May 7, but it seems likely they were on at 1500 this time around as well.
Thanks Token!
Thanks for the reports.
As always, V24 is in constant change. This station has done this as long as I have been watching it. As soon as a prediction chart is put out the next month there are typically some small changes, and V24 always has a few transmissions that do not fit any pattern each month, that is why I never say these charts are more than about 80% or so accurate at the time of publication. And I also typically say "at the time of publication", because as time goes on they get less and less accurate. Typically I try to put out 2 to 4 charts a year to somewhat keep up with the changes.
Re May 26, 5715 kHz, at 1500z. Yes, in March and April V24 transmitted this time slot, but previously they had used 1430z. Note that the chart is called "1Q 2016", for first quarter, 2016 and I published it on April 26, before 1200z. The end of March was the end of the first quarter. It appears V24 was in the process of changing this time slot schedule across the end of the data collection for this chart.
I typically wait until I have at least two examples of a time / frequency slot before adding it to the chart, and at publication the second transmission confirming the change of operations had not happened yet.
This time slot (26 and 28 day of the month, 5715 kHz at 1500z) will appear in the next chart, assuming V24 is still using it when I put the chart up, as I have the March, April, and May transmissions recorded for 5715 kHz, 1500z.
Re May 27, 4900, at 1530. I was out of the country and my recording system failed from May 26 to June 3 for this frequency, so I have no data for May 27, 4900 kHz. However I do have the recordings for March and April. The same problem again. The change in schedule may have been happening at the time I put the chart out. At that time only the single March transmission had happened, with no second transmission yet sent to back it up.
Further, my April 27 recording does NOT show 4900 kHz, 1530z active, although my March recording does. Of course it could be a case of propagation killing the signal for me, however based on the presence of other Asian signals in the recording I do not think this is the case. Looking at the chart on chobi.net (here
http://radio.chobi.net/DX/data/V24KoreanNumbers.html ) I see several suspect entries. I am less sure that is a day to day logging than someone building a chart from compiled previous information. For example, they show the 5900 kHz / 1600z time slot as active on 15 April, but it was not used that month, and it was used the previous month (15 March, 5900 kHz, 1600z). 15, 18, 22, and 25 day, 5900 kHz, 1600z was used in March, but only 18, 22, and 25 day was used in April. I reported the March operation to them in early April, and they appear to have inserted it in the April reports.
This time slot (27 day of the month, 4900 kHz at 1530z) will appear in the next chart if V24 is still using it at that time. However, because of the 23 and 25 day of the month same freq / time usage there may be some flexing going on here. I have often suspected that V24 uses several time slots as "catch up" slots, and the station appears less rigidly fixed in those slots.
T!