开云体育

Hi Simon,

I am not in Consumer Test Business testing all amplifiers designed for active antennae.
However, I have by training and schooling an acknowledge by looking at schematic diagram and having on hands available data sheets to weigh whether that electronic device was designed for proper application.
For example, I bought Nooelec Lana HF amplifier thinking that this device with 50 ohms input will be an appropriate device for AirSpy Youloop-2t.
Later I learned it was not so...Of course, I am not interested to invest in purchasing Vector Network Analyzer? retesting all available work done by others.
Another good example I only recently started of using SDR.
I purchased a chineese maded Dongy type SDR with White Dolphin trade mark on it which was advertised as inexpensive but well performing. By reverse engineering I discovered that chineese "experts" copied someone's design but
installed solid-state switches for pre-selector filters that could not be switched on/off because of wrong logic signals beinge applied from processor to those switches. I could cut on PCB certain paths fixing the problem or switching over other available in trade switches. Instead I? decided to turn back the SDR to the vendor buying? SDR RSP1A with AirSpy Loop Antenna experiencing a new headacke with the loop antenna.

Regards,

(retired telecommunications engineer )
Raphael
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