How to debug the passband of a tunable filter with typical bandwidth？

Kuitira kugutsa zvikumbiro zviri nyore, Jingxin inogadzira mafirita anobatika ekuti mutengi azvigadzirise ega, uye inopa gwara rekuti riite nemazvo semuenzaniso unotevera weVHF sefa.

1. Re-tuning nzira yetunable sefaJX-SF1-152174-215N
Iwo mafirita akagadzirirwa kuridza pamusoro pegumi neshanu MHz renji uye ane yakajairwa passband bandwidth ye8 MHz.

2. Equipment inodiwa
A network analyzer inogona kuratidza kurasikirwa kwekupinza uye kurasikirwa kwekudzoka.
Mukati yepassband, kurasikirwa kwekuisa kunofanira kuva ≤ 1.7dB; kurasikirwa kwekudzoka kunofanira kuva ≥20dB
Ruoko Zvishandiso: 6mm yakavhurika-kuguma spanner; Yakarurama screwdriver

3. Re-Tuning Method
Maitiro aya anotsanangura maitiro akashandiswa kune imwe unit yakamborongedzerwa kune yepakati frequency ye160.3MHz, uye bandwidth 8 MHz renji.
Sezvinoratidzwa mumufananidzo 1, iyo resonator tuning screws inosarudzwa seF1, F2, F3, F4, uye F5. Aya matuning screws anotarisisa iyo yepakati frequency yedanda rega rega, sezvo tuning screws ichipinda mukati, frequency ichaita kunge yakadzikira, nepo tuning screws ichienda kunze, uye frequency ichakwira.
F12, F23, F34, F45 mascrews ekubatanidza, aya screws anotarisisa bandwidth yepassband, screws inoenda mukati, uye inogona kuwedzera kurudyi rwepassband, zvikumbiro zvinoenda kunze zvinogona kutetepa rutivi rwekurudyi rwepassband.

Mufananidzo 1

Danho 1: Batanidza sefa JX-SF1-152174-215N kune yakagadziriswa network analyzer, sezvakaratidzwa mumufananidzo 2.

Mufananidzo 2

Danho 2: Seta inodiwa yepakati frequency ye160.3MHz uye bandwidth ye8MHz

Nhanho ye3: Iyo yekutanga frequency ye160.3MHz ± 4MHz, Kunze-kwe-bhendi rejection frequency 160.3±9MHz uye 160.3±14MHz inogona kuoneka mu frequency band renji, sezvakaratidzwa mumufananidzo 3.

Mufananidzo 3

♦Matanho anotevera ndiwo maitiro ekugadzirisa epakati frequency kubva 160.3MHz kusvika152MHz

1) Iyo frequency inoenda kubva kumusoro kusvika yakaderera, munhevedzano tenderera clockwise screws F1, F2, F3, F4, F5 kusvika 152MHz ± 4MHz, ese tuning screws anoenda mukati, kuwanda kwegomba kuchachinja kubva kumusoro kuenda pasi, iyo passband. inofamba kuruboshwe.

Mufananidzo 4 unoratidza shanduko yega yega tuning screw pane frequency ye152MHz±4MHz.

Mufananidzo 4

1) Mushure mekutenderera kune tuning screw F5, ramba uchishandisa 6mm spanner zvishoma kusunungura nati; screwdriver inotenderedza tuning screws, gadzirisa kurasikirwa kwekudzoka kune kukosha kwakatarwa, Kana kurasikirwa kwekuisa uye kurasikirwa kwekudzoka kuruboshwe kusingakwanise kusvika kune yakatarwa kukosha, iyo kurasikirwa kwekuisa uye kurasikirwa kwekudzoka kunogona kudzikiswa nekutenderedza wachi kana kuti newachi maseruru ekubatanidza F12, F23, F34 uye F45, sezvakaratidzwa mumufananidzo 5.

Mufananidzo 5

Mufananidzo 6 igirafu yakazara yepakati frequency pa152MHz; bandwidth pa8MHz

Mufananidzo 6

♦Matanho anotevera ndiwo maitiro ekugadzirisa epakati frequency kubva160.3MHzku174MHz

1) Iyo frequency inoenda kubva pasi kuenda kumusoro, munhevedzano tenderera clockwise screws F1, F2, F3, F4, F5 kusvika174MHz ± 4MHz, ese tuning screws anoenda kunze, kuwanda kwegomba kuchachinja kubva pasi kuenda kumusoro, iyo passband inofamba. kurudyi.

Mufananidzo 7 unoratidza shanduko yega yega tuning screw pane frequency ye174MHz±4MHz

Mufananidzo 7

2）Mushure mekutenderedza ku tuning screw F5, ramba uchishandisa 6mm spanner zvishoma kusunungura nati; screwdriver inotenderedza tuning screws, gadzirisa kurasikirwa kwekudzoka kune kukosha kwakatarwa, Kana kurasikirwa kwekuisa uye kurasikirwa kwekudzoka kusingakwanise kusvika kukosha kwakatarwa, kurasikirwa kwekuisa uye. kurasikirwa kwekudzoka kunogona kudzikiswa nekutenderedza wachi kana kuti kuchinjika masiruuru ekubatanidza F12, F23, F34 neF45, sezvaratidzwa mumufananidzo 8.