感觉我的电台发射功率变小了

就是80W到功率计上一开始有70左右，后面只有50了，FT8

电源带不动或者电池带不动导致降压了你用的电源是什么😧

摸摸巴伦或磁环热不热，也可以用sdr看看是不是输出杂散劣化。如果机器没问题那有可能是磁环发热变成非线性元件了。

用功率计看看swr，驻波上去了就是天馈问题，驻波没变就是电源供电不行或者机器散热不行。也可以电源上再并个电压表，电压掉了就是供电，电压没掉就是机器散热。

至少要提供一下什么台子、什么天线、怎样供电吧不过呢，什么都不提供也能解决这个问题——FT8，把功率设置成5～10W就行，够用了，50～80W功率实在太大了等你被日本大佐集体围殴，要打突围战时，再考虑适当加大功率吧😂

@"BG4IJK"#p94081 FTDX10，750V天线，钻石GSV3000电源供电

可以用仪器测试下发射功率到底是多少

Will shortwave radio stations experience a decrease in power over time?

BG5JVM

I feel like my radio's transmission power has decreased.

BG5JVM

Initially, the power meter showed around 80W, but later it only read 50W. This was while using FT8.

BG2GFC

The power supply or battery was unable to provide enough voltage, resulting in a voltage drop.
What power supply are you using?😧

BG5JVM

BG2GFC Diamond GSV3000

bg7nzl

Check if the Baren or magnetic ring is hot, or use an SDR to see if there's any degradation in the output. If the machine itself is fine, it could be that the magnetic ring is overheating and becoming a non-linear component.

ba7ck

Vague

bg7nzl

Use a power meter to check the SWR. If the SWR is high, it indicates a problem with the antenna or transmission line. If the SWR remains unchanged, it suggests that the power supply is not functioning correctly or that the equipment is overheating. You can also add a voltmeter to the power supply to check the voltage. If the voltage drops, it indicates a power supply issue. If the voltage remains unchanged, it suggests that the equipment is overheating.

YofoaStudio

The operating conditions need to be clearly specified.

BG4IJK

At a minimum, please provide information about the type of equipment, antenna, and power supply.

However, there's a solution that doesn't require providing anything – use FT8 and set the power to 5-10 watts. That should be sufficient. A power of 50-80 watts is simply too high.

Wait until you're being collectively beaten by a group of Japanese majors, and then consider increasing the power if you need to engage in close-quarters combat.😂

BG5JVM

BG4IJK FTDX10, 750V antenna, powered by Diamond GSV3000 power supply

debain

You can use instruments to measure the actual transmit power.

BG5JVM

debain I'm considering buying a used comprehensive test instrument? ( )

BH4GQD

Is the antenna setup okay? In FT8 mode, the computer's output volume can also affect power.

BG5JVM

BH4GQD The pressure is fine, below 1.5.

BeToDoing

Regarding the DX10, be careful when transmitting FT8 for extended periods, as it has already overheated significantly. Furthermore, since you've noticed a decrease in power, I recommend having it checked by the manufacturer. This particular radio is not well-suited for prolonged FT8 operation. If one of the two antennas fails, the entire unit will likely fail.

BA7NQ

To rule out the possibility of insufficient power from the radio itself, we need to use a dummy load and a power meter to check.

Connect a dummy load and a power meter to the radio, transmit at full power in CW mode, and check if the power output is normal and if the voltage of the power supply remains within an acceptable range (less than 0.2V). This will help rule out any external issues.

Do not use SSB and microphone volume, FT8 and sound card input level settings, or other software settings to detect power.

If a simulated load plus CW mode transmission detection reveals insufficient power, this is usually related to the radio's PA (power amplifier) section. This could be due to aging components in the amplifier, issues with surrounding parts, or even problems with the circuit board itself, such as incorrect biasing, relay contact problems, etc.

If the initial transmit power is normal, but the power decreases after continuous transmission for a period of time, it may be due to saturation of some magnetic cores in the LPF (Low-Pass Filter) section.

BG5JVM

BA7NQ Okay, I'll try it later and see if the new radio station has any issues with aging.

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