目前有一个RTL-SDR V4。我把附带的偶极拉杆天线固定在防盗网外，把天线和防盗网用导线连起来，用于收听短波。效果我感觉还行，传播好的时候20米、15米的单边带也能收到一点（楼下电动车还没开始充电的时候），FT8最远也能收到一些欧洲美洲的电台。（20米干扰强的时候会有广播出现在业余段中，不知道原理？）现在我想提升一点短波接收的效果，但是我不知道我这套的瓶颈究竟是接收机还是天线。我这边楼层（4F）不高，旁边也有一些楼(10F)遮挡。升级接收机那就是买个RSP1了，听说这个短波效果好，但是不知道比现在的V4好多少。升级天线的话可能是买个类似K180这样的小环伸出窗外吧。

如果要听短波，建议上RSP1，灵敏度要更高一些，另外k180远没有宣传那么厉害，它能用，也有一定的接收效果，但很容易导致信号过载，一旦所处位置有电磁干扰，哪怕在乡下，频谱也是各种干扰信号，严重影响接收体验。

@"BI7ALG"#p72194 感谢！rsp1家晨那个就可以吗

@"BG7ZJK"#p72231 家晨RSP1在用，短波还可以的

@"BA7NNC-JOE"#p72232 那个现在降下来了吗，前阵子看因为MSI001涨价直接比以前一开始的价格涨了两百块钱（

@"BH2VSQ"#p72235 淘宝店没留意呢，估计没有吧，MSI停产导致涨价的，看咸鱼简陋呗

没有好天线，巧妇难为无米之炊

RTL原版的SDR UV可以 HF就有点为难了如果喜欢HF 买个原版的RSP也不是不行~ 最起码比国产的保值点国产的就北京那家是最好的可惜不做了

串广播是SDR过载导致互调了，直采就有这种问题，先升级一下进SDR的BPF。然后升级天线

Should I upgrade my receiver or my antenna?

BG7ZJK

I currently have an RTL-SDR V4. I've attached the included dipole antenna to the outside of the anti-theft mesh, and connected the antenna and mesh with a cable for shortwave listening. The performance seems okay; when propagation is good, I can receive some on the 20m and 15m bands (when the electric car downstairs hasn't started charging), and I can also receive some European and American radio stations using FT8 (although there are strong 20m band interference, which causes broadcasts to appear in the amateur band – I don't understand the principle?).

Currently, I want to improve my shortwave reception performance, but I'm not sure whether the bottleneck lies in the receiver or the antenna. My current location is on a higher floor.（4F）It's not very tall, and there are also some buildings nearby.(10F)Blocking. Upgrading the receiver means buying an RSP1, which I've heard has good shortwave performance, but I don't know how much better it is than my current V4. If I upgrade the antenna, I might buy something like a K180 and extend it out the window.

feng

Antenna

BI7ALG

If you want to listen to shortwave, I recommend using the RSP1. It has higher sensitivity. Also, the K180 is not as impressive as advertised; it can be used and does have some receiving capabilities, but it's very prone to signal overload. If your location experiences electromagnetic interference, even in a rural area, the spectrum will be filled with various interfering signals, which severely affects the reception experience.

BG7ZJK

BI7ALG Thank you! Does rsp1's morning service work?

BA7NNC-JOE

BG7ZJK I'm using a Ham Radio RSP1, and the shortwave performance is acceptable.

BI7ALG

BG7ZJK I recommend buying a used one, which usually costs around 200 yuan. The price on Taobao was originally 188 yuan, but due to the shortage of chips, it has increased to 388 yuan. This is not very cost-effective, and besides, this product is prone to causing fever, so there's no need to buy a new one.

BH2VSQ

BA7NNC-JOE Has the price come down since then? I noticed that the MSI001 increased in price recently, and it went up by two hundred yuan compared to its initial price.

BA7NNC-JOE

BH2VSQ I didn't notice it on Taobao, I guess it probably doesn't exist. The price increase is likely due to MSI discontinuing production. Let's check the "Xianyu" (second-hand goods platform) for a basic version.

BG8KUQ

Without a good antenna, even a skilled person cannot make something out of nothing.

BG2EFX

The RTL-SDR UV dongle can handle VHF/UHF frequencies, but HF frequencies are a bit more challenging.
If you like HF, buying an original RSP isn't a bad idea either. At least it will retain its value better than domestic brands.
The best one made in China is located in Beijing, but they no longer produce it.

BI7ALG

BG2EFX What will the one in Beijing be like?

BG5EIB

Satellite feed

BH7JUO

The issue of cross-modulation occurs due to SDR overload, which affects both direct reception and SDR. First, upgrade the BPF (Baseband Processor) in the SDR system. Then, upgrade the antenna.

dxs660

From a practical standpoint, the environment is the most important factor. If the surrounding electromagnetic environment is poor, having a better antenna will increase the sensitivity of your receiver and also increase the amount of noise and interference it picks up. If you can't change the environment, try changing the antenna, but this essentially just amplifies both noise and signal.

BG7ZJK

dxs660 This isn't feasible in practice, so relying on a small collar with directional shielding to block out some interference is unrealistic.

BG2EFX

BI7ALG Very close to the original version ~ There are no words or images above.

dxs660

BG7ZJK I've used this small loop antenna, and it wasn't particularly amazing or high-tech. It's just a powered antenna with an amplifier, and it performs synchronous amplification of both noise and signals. You could also try a passive small loop antenna made from coaxial cable – they are very inexpensive and readily available on Taobao.

xunyu

Location>Antenna>Equipment
I have used a DE (德生) radio to compare the shortwave reception performance of RTL-SDR v4. The results were similar, regardless of my location.

BI4MIG

Under conditions where the location environment remains unchanged, it is recommended to upgrade the antenna system. This is because the environment>Satellite feed>Equipment
Initially, I also wanted to buy a smart TV stick and use it with my computer to display waterfall charts. However, I eventually bought the De Sheng 330.😅
Later, I got a B on my exam and started saving money, so I bought a shortwave radio. It can both receive and transmit signals – how great!
Actually, if you think about it this way, once you buy the device, you can continue to use it even when setting up shortwave radio. Right?

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