QTH在杭州，接收BPM的5/10/15/MHz都没问题，但2.5MHz没有收到过。发射时间范围应该是每天15:30-09:00吧。使用PL-368（原装拉杆与磁棒天线）、G90N（MA-01 7M加感天线）、UV-K6（RH795天线）等都收不到。这个频点的传播是不是得当成中波？是因为传播特点或城市干扰收不到吗？有什么接收的技巧呢？

2.5？晚上高纬度地区优势较大参考80米~

按照BPM给我的返卡，2.5MHz的确是在 BJT 15:30-09:00发射

有场地就拉个beverage天线

@"Ken"#p46574 我之前也是集齐了其余几个波段，唯独2.5M始终收不到。直到有一次深夜突发停电，急忙从床上爬起来打开机器，终于听到了微弱的声音。总而言之还是城市干扰太严重

@"BG2EWI"#p47073 还是马可尼时代的优势

What are some tips for receiving BPM 2.5MHz signals?

Ken

QTH is located in Hangzhou, and I can receive signals on 5/10/15 MHz without any issues. However, I haven't been able to receive anything on 2.5 MHz. The transmission time range should be between 15:30-09:00 daily. I have tried using PL-368 (with the original joystick and magnetic loop antenna), G90N (MA-01 7M with a whip antenna), and UV-K6 (RH795 antenna), but haven't been able to receive anything. Is this frequency band considered shortwave? Could it be that I'm not receiving signals due to the propagation characteristics or urban interference? What are some tips for receiving on this frequency?

BG2EWI

Ken I had previously managed to receive signals from the other segments, but I consistently failed to pick up the 2.5M frequency. It was only during one late-night power outage that I finally heard a faint signal when I rushed to turn on the equipment. In short, the interference in the city is simply too strong.

BG2EFX

2.5？
In the evening, high-latitude regions have a significant advantage. Refer to 80 meters.

BA7LIX

According to the return card provided by BPM, the 2.5 MHz transmission was indeed from BJT between 15:30 and 09:00.

Ken

今天接收BPM 2.5MHz成功了，使用UV-K6（加SI4732芯片、RH795天线）。应该就是城市电磁环境原因，在小区楼顶收不到，但在偏僻开阔的区域能勉强接收，底噪较大。

BG2KAJ

If you have a suitable location, set up a beverage antenna.

BG5GXL

BG2EWI Still, the advantages of the Marconi era remain.

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