This is a good opportunity to give a little primer about Chinese jamming.
The Chinese are determined to keep undesired broadcasts from reaching their citizens' ears. To that end, they seem to use very high power jamming signals, at least in comparison to the ones being blocked, and I think that they may use multiple transmitters on a single frequency when they do. This is based on the fact that sometimes I hear echoes that are reminiscent of what you hear when you get both short and long path, but the delay seems just a bit shorter. Not at all a scientific observation, I realize.
Anyway, why does this matter? Because most of the time China uses a stream of China National Radio 1 (CNR1) to jam. (If you hear the Firedrake, then you know right away. Most stations transmitting from outside of China to that country don't have music - and if they do, it's not an uninterrupted hour of it.)
If you don't speak Mandarin, you're not likely to know the difference. So, how can you tell if you're hearing RFI or VOA or something else that the schedule lists? You have to tune in to other frequencies and make comparisons. And you may need to get on some online SDRs located in East Asia to check. Another good thing to do, in the case of RFA, is go to their site and find the Mandarin language stream. The delays make comparing the audio a little tricky, but usually the difference is pretty obvious, especially after a minute or so.
The thing I do is look either for CNR1 on the schedule, or any listing of "CNR1/Firedrake Jammer" on the Eibi schedule, and see if they're playing the same thing that I'm hearing. This is valuable if the "CNR1/Firedrake jammer" listing is concurrent with a DIFFERENT station than the one listed. The main ones that get jammed are VOA in Mandarin, RFA in Mandarin or Tibetan, and Radio Taiwan International (RTI) in Mandarin. The Firedrake is often used against RFA, but not the others.
Sadly, 99% of the time you're hearing jamming. That has to be your assumption when you first find a broadcast that's supposed to be RFA, RTI, VOA, or some others that have Mandarin broadcasts with the Far East as its target, and you have to work to prove that it's NOT a jamming signal before you log it.
The way I came to realize how much effort China puts in this is.... last year, RTI had an English broadcast on either 7445 or 7455 (I'm forgetting which - it's not on anymore) at 1100 UTC, which I could copy with a fair signal most mornings here in Denver. At 1200, they switched to Mandarin, while staying on the same antenna with the same power and direction. And at that time all of a sudden, came in this HUGE signal, which I could find in many other frequencies, primarily in the 49m band. It was the CNR1 jammer. It showed me how much more power they use than Taiwan, which I think was listed as having a 100 kW signal.
Topic: UNID 9965 khz 1837 UTC 18 July 2018 (Read 4550 times)