如题（长波135.7khz-137.8khz)

设备有一些，ICOM 7610 的欧版是可以137k发射，另外你得有功放，长波天线效率很低

@"tudoubocai"#p92271 长波这个频宽除了CW也没别的能用了吧

@"BI7BST"#p92675 是不是可以通联大黑鱼？

@"BI7BST"#p92675 想整点RTTY或者FT8也不是不行，反正带宽是足够的

长波那天线是国家级玩的，普通人就别想了！

@"tudoubocai"#p92271 长波是AM调制！

@"BI9DCL"#p92719 长波的业余频段135.7kHz—137.8kHz，只有2.1k带宽，没法AM，只能PSK31、RTTY、CW这些窄带模式吧，连SSB（含FT8）都不够全带宽操作的。

Do you have any equipment for long-range communication?

BI3TSY

As the title indicates (long wave 135.7 kHz - 137.8 kHz)

BI4PMQ

Can be handmade.

tudoubocai

What modulation modes are commonly used for long wave?

BI7BST

tudoubocai Besides CW, there doesn't seem to be any other frequency range that can be used for long wave communication.

BI9DCL

tudoubocai Long wave is AM modulation!

BH3PTS

tudoubocai The most common longwave modes are FST4 and FST4W, specifically designed for modulating weak signals in the longwave band. QRSS and WSPR are also used, but their signals are too weak for CW, and AM cannot fit into the 2.1 kHz bandwidth.

BI1NIZ

There are some equipment available, and the European version of the ICOM 7610 can transmit at 137 kHz. However, you also need a transmitter, and long-wave antennas have very low efficiency.

BI4MIG

BI7BST
Is it possible to connect with the "Da Hei Yu"?

BH9DWE

BI7BST I could also try RTTY or FT8, since I have enough bandwidth.

BI9DCL

For long-wave communication, you need a national-level setup; ordinary people can't do it!

BI1KPO

BI9DCL The longwave amateur band, from 135.7 kHz to 137.8 kHz, has a bandwidth of only 2.1 kHz, making it unsuitable for AM operation. It can only support narrow-band modes such as PSK31, RTTY, and CW. Even SSB (including FT8) cannot operate at full bandwidth.

BI3SVM_Rinko

Pulse modulation

BH3PTS

The most mature DIY machine is the JUMA TX136.
The "商品机icom" includes some machines, specifically the iCOM 7610 European version, which has a frequency of 136 kHz.

BI4PYM

It's rare to find someone who wants to play long wave.

BD7PPA

Even with kW-level input, it's not guaranteed to achieve a full 1W EIRP.🌚

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