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

Txhawm rau txhawm rau txheeb xyuas cov ntawv thov hloov pauv, Jingxin txhim kho cov ntxaij lim dej tunable rau tus neeg siv khoom los daws qhov teeb meem ntawm lawv tus kheej, thiab muab cov lus qhia kom haum raws li cov piv txwv hauv qab no ntawm VHF lim.

1. Rov kho cov txheej txheem rautunable limJX-SF1-152174-215N
Cov ntxaij lim dej yog tsim los kho dua 15 MHz ntau yam thiab muaj ib qho kev sib txuas ntawm bandwidth ntawm 8 MHz.

2. Cov khoom siv yuav tsum tau ua
Lub network analyzer uas tuaj yeem pom qhov poob thiab rov poob.
Tsis pub dhau lub passband, qhov kev poob qis yuav tsum yog ≤ 1.7dB; rov poob yuav tsum yog ≥20dB
Cov cuab yeej tes: 6mm qhib-kawg spanner; Ncaj ntswj ntsia hlau

3. Txoj kev rov kho dua
Cov txheej txheem no yuav piav qhia txog cov txheej txheem siv rau ib chav tsev yav dhau los tau hloov mus rau qhov chaw nruab nrab ntawm 160.3MHz, thiab bandwidth 8 MHz.
Raws li pom nyob rau hauv daim duab 1, lub resonator tuning screws raug xaiv raws li F1, F2, F3, F4, thiab F5. Cov ntsia hlau ntsia hlau no txiav txim siab qhov nruab nrab zaus ntawm txhua tus ncej, vim tias cov ntsia hlau ntsia hlau txav mus rau sab hauv, qhov zaus yuav qis dua, thaum cov ntsia hlau tig tawm sab nraud, thiab qhov zaus yuav siab dua.
F12, F23, F34, F45 yog cov ntsia hlau txuas, cov ntsia hlau no txiav txim siab qhov bandwidth ntawm passband, screws txav mus rau sab hauv, thiab tuaj yeem nthuav sab xis ntawm tus passband, cov ntsia hlau txav mus rau sab xis tuaj yeem nqaim sab xis ntawm lub passband.

Daim duab 1

Kauj Ruam 1: Txuas lub lim JX-SF1-152174-215N rau lub teeb tsa network analyzer, raws li qhia hauv daim duab 2

Daim duab 2

Kauj Ruam 2: Teem lub nruab nrab zaus ntawm 160.3MHz thiab bandwidth ntawm 8MHz

Kauj ruam 3: Thawj zaus ntawm 160.3MHz ± 4MHz, Tawm-ntawm-band rejection zaus 160.3 ± 9MHz thiab 160.3 ± 14MHz tuaj yeem pom nyob rau hauv ntau zaus band, raws li qhia hauv daim duab 3

Daim duab 3

♦Cov kauj ruam hauv qab no yog cov txheej txheem debugging ntawm nruab nrab zaus ntawm 160.3MHz mus rau152MHz

1) Lub zaus mus los ntawm qhov siab mus rau qis, nyob rau hauv ib theem tig clockwise screws F1, F2, F3, F4, F5 mus rau 152MHz ± 4MHz, tag nrho cov tuning screws txav mus rau sab hauv, qhov zaus ntawm kab noj hniav yuav hloov tag nrho los ntawm siab mus rau qis, passband txav mus rau sab laug.

Daim duab 4 qhia txog kev hloov ntawm txhua qhov ntsia hlau ntsia ntawm qhov zaus ntawm 152MHz ± 4MHz.

Daim duab 4

1) Tom qab rotating rau tuning ntsia hlau F5, txuas ntxiv siv 6 hli spanner me ntsis loosen cov txiv ntoo; ntsia hlau tig tig cov ntsia hlau, kho qhov rov qab poob rau cov nqi teev, Yog tias qhov poob qis thiab rov qab poob ntawm sab laug tsis tuaj yeem ncav cuag tus nqi, qhov Kev poob qis thiab rov qab poob tuaj yeem raug txo los ntawm rotating clockwise los yog counterclockwise lub coupling screws F12, F23, F34 thiab F45, raws li qhia nyob rau hauv daim duab 5.

Daim duab 5

Daim duab 6 yog ib daim duab tiav ntawm qhov nruab nrab zaus ntawm 152MHz; bandwidth ntawm 8 MHz

Daim duab 6

♦Cov kauj ruam hauv qab no yog cov txheej txheem debugging ntawm central zaus los ntawm160.3 MHzrau174 MHz

1) Lub zaus mus los ntawm qhov qis mus rau siab, nyob rau hauv ib theem tig clockwise screws F1, F2, F3, F4, F5 mus rau 174MHz ± 4MHz, tag nrho cov tuning screws txav mus rau sab nraud, qhov zaus ntawm kab noj hniav yuav hloov tag nrho los ntawm qis mus rau siab, passband tsiv. mus rau sab xis.

Daim duab 7 qhia txog kev hloov ntawm txhua qhov ntsia hlau ntsia ntawm qhov zaus ntawm 174MHz ± 4MHz

Daim duab 7

2) Tom qab rotating rau tuning ntsia hlau F5, txuas ntxiv siv 6 hli spanner me ntsis loosen cov txiv ntoo; ntsia hlau tig tig cov ntsia hlau, kho qhov rov qab poob rau tus nqi teev, Yog tias qhov poob thiab rov qab poob tsis tuaj yeem ncav cuag tus nqi, qhov poob thiab rov qab poob tuaj yeem raug txo los ntawm kev tig clockwise los yog counterclockwise cov coupling screws F12, F23, F34 thiab F45, raws li qhia hauv daim duab 8