is there any thing missing in this rtlsdr board.

Hi all,

I buy this SDR "https://m.aliexpress.com/s/item/32750237291.html?trace=wwwdetail2mobilesitedetail&productId=32750237291&productSubject=100KHz-1-7GHz-VHF-UHF-Band-RTL-SDR-UpConverter-SDR-Receiver-NFM-FM-DSB-LSB-CW&spm=2114.01010208.3.7.bmojBa&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10065_10151_10208_10068_10136_10137_10060_10155_10062_437_10154_5300011_10056_10055_10054_10059_303_100031_10099_10103_10102_10096_10052_10053_10142_10107_10050_10051_5030011_10084_10083_10080_10082_10081_10110_519_10175_10111_10112_10113_10114_10182_10078_10079_10073_10123_10189_142,searchweb201603_13,ppcSwitch_5&btsid=5b59118d-fbe9-4845-a3a0-191810690f39&algo_expid=797cda62-b9f7-4747-bfba-52122b16ad19-0&algo_pvid=797cda62-b9f7-4747-bfba-52122b16ad19" Inner images of board

"https://i.imgur.com/oYKeJq5.jpg " "https://i.imgur.com/pDb2Rin.jpg " as advertise built-in up converter but it converter not good after comparison with rtlsdr v3 at HF. Is some thing missing on this board or it works normal as other generic SDR does? It works good on UHF and vhf band. Sensitivity of this board is not good, noise level create mountain like curve in FFT window when increasing gain. It is deef on LF & MF. Are there any improvement which can be done on this board.

However, it pick up some am station on hf but not good as V3 does with same anteena.