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- *****- Feedback left by buyer.More than a year agoVerified purchaseGood buyer, prompt payment, valued customer, highly recommended.
Reviews (2)
03 Feb, 2018
Excellent amplifier in kit, but not for beginners.
4 of 4 found this helpful This class AB RF amplifier is sold widely on Chinese Webs. It really works perfectly, but it is not suitable for beginners. First: It is not accompanied by a scheme.
Second, the SMD components are not identifiable with the naked eye, so you have to use measuring devices, in the case of capacitors, of those used in a laboratory. There is a lack of instructions such as that parts of the printed circuit must be cut to make the support of the ferrite transformers. Fortunately, on the Internet it is easy to find blogs and videos that describe the problems to build this Kit, a symptom that is very popular and sold.
The most important: It can not be used without a low pass filter attached to the emission band. That detail is very important and is omitted by the sellers.
In my case, it worked perfectly, although it does not really reach 70 W of antenna power. For the price of the Kit, which does not exceed the price of the components, I am very satisfied.
EA8ARX, Álvaro Felipe Hernández.
07 May, 2019
Cheap an useful
The item is as promised by the seller. It works correctly with SDR Touch (Android) and SdrSharp (W10). The only problem that I have detected is that if there are powerful FM stations they are able to pass through the HF front-end low pass filter and create false reception in the range of 1...8 Mhz, corresponding to the frequencies of 100...108 Mhz (upconvertion activated). It can be checked by selecting broadband FM. It only happens with powerful commercial FM stations. I'm using it in a multifunctional HF QRP GO-BOX.