1. Due to the fact that the LNA of ULTRA is only effective below 3.5GHz, some users hope to improve high-frequency sensitivity, which is very useful for users who need to measure 5.8GHz applications. We have checked some widely used modules in the market, and most of the broadband LNA modules with a nominal 6GHz have very poor flatness. Some standard 20dB LNA modules have a gain of less than 10dB at 6GHz. 2. And these modules do not provide actual test data, only chip data manuals are provided, but most of the modules are not completely consistent with the circuits in the chip manual, which causes difficulties for users when using them in practice, especially for some cascaded modules that claim high gain. At low frequencies, there may be a risk of high gain, low k value, and self excitation damage to the receiver. For ease of use, we have designed a series of LNA modules with USB interfaces. 3. The for UM series is a USB interface powered RF low-noise amplifier launched by for , featuring a convenient power interface, moderate gain, high IP3, and low noise. This series uses a USB type-C interface for power supply, with a built-in high PSRR LDO that can effectively reduce power noise. 4. Compared with other vendors' USB directly fed modules, it effectively reduces background noise. The UM series LNA adopts a very compact design and uses a system shielding cover. It may rust due to moisture, so please pay attention to moisture prevention when using it outdoors. 5. The for ZeenkoBM series is a USB interface powered RF low-noise amplifier with built-in battery launched by for . Adding batteries and reducing power consumption on the basis of for UM is suitable for portable use. Compared with other merchants' built-in battery modules, it has a flatter consistent gain, lower background noise, smaller size, and longer battery life. The higher the amplifier gain, the better. As a preamplifier or antenna amplifier, it should be based on the post amplifier feeder loss+receiver noise figure+(3-6) dB, usually 20dB is sufficient. For the preamplifier of a spectrum analyzer, due to the wide bandwidth of the front-end circuit, the larger the gain, the worse the anti blocking performance, and the stronger the intermodulation products, making it more susceptible to interference. If there are no special requirements, please do not use both the built-in LNA and external LNA of ULTRA at the same time. Model Number:LNA :ELECTRICAL Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Type:ZK09-UM Colour:As Shown Material:Metal Package Contents: 1 * Low Noise Amplifier 1 * USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.