Yaesu Musen 20581X50 HF/50 MHz Transceiver User Manual FTDX1200 Operating Manual

Yaesu Musen Co., Ltd. HF/50 MHz Transceiver FTDX1200 Operating Manual

Users Manual 4

Page 44 FT DX 1200 OPERATING MANUALCONVENIENCE FEATURESRECEIVER OPERATION (FRONT END BLOCK DIAGRAM)The FTDX1200 includes a wide range of special features to suppress the many types of interference that may be encoun-WHUHGRQWKH+)EDQGV+RZHYHUUHDOZRUOGLQWHUIHUHQFHFRQGLWLRQVDUHFRQVWDQWO\FKDQJLQJVRRSWLPXPVHWWLQJRIWKHFRQWUROVLVVRPHZKDWRIDQDUWUHTXLULQJIDPLOLDULW\ZLWKWKHW\SHVRILQWHUIHUHQFHDQGWKHVXEWOHHIIHFWVRIVRPHRIWKHFRQWUROV7KHUHIRUHWKH IROORZLQJLQIRUPDWLRQ LVSURYLGHG DVD JHQHUDOJXLGHOLQH IRUW\SLFDO VLWXDWLRQVDQG DVWDUWLQJpoint for your own experimentation.The FTDX1200LQWHUIHUHQFH¿JKWLQJ FLUFXLWU\EHJLQV LQ LWV ³5)´VWDJHV DQG FRQWLQXHVWKURXJKRXW WKH HQWLUHUHFHLYHUsection. FTDX1200DOORZVFRQ¿JXUDWLRQRIWKHIHDWXUHVGHVFULEHGEHORZR. FLT ()7KUHH5RRILQJILOWHUVRIN+]N+]DQGN+]EDQGZLGWKVDUH SURYLGHGLQ WKH)LUVW ,)ULJKWDIWHU WKHfirst mixer. These filters are automatically selected to provide narrow-band selectivity to protect the following ,)DQG'63VWDJHV7KHDXWRPDWLFDOO\VHOHFWHG¿OWHUPD\EHPDQXDOO\FKDQJHGE\WKHRSHUDWRULIGHVLUHGIRUVSH-cial operating circumstances.CONTOUR Filter7KH'63 &RQWRXUILOWHUKDVWKHXQLTXHDELOLW\ WRSUR-vide either a null or a peak in tunable segments of the receiver passband. You may suppress interference and H[FHVVLYHIUHTXHQF\FRPSRQHQWVRQDQLQFRPLQJVLJQDORU\RXPD\SHDNWKRVHWXQDEOHIUHTXHQF\VHJPHQWV7KHOHYHORIWKHQXOORUSHDNDQGWKHEDQGZLGWKRYHUZKLFKLWLVDSSOLHGDUHDGMXVWDEOHYLDWKH0HQXIF SHIFT7KHSDVVEDQGFHQWHUIUHTXHQF\RIWKH,)'63¿OWHUPD\be moved up or down by adjusting this control.IF WIDTH7KHZLGWKRIWKH,)'63¿OWHULQJPD\EHDGMXVWHGXVLQJthis control.IF NOTCH7KH,)1RWFK¿OWHULVDKLJK4QRWFK¿OWHUWKDWFDQHOLP-LQDWHRUVLJQL¿FDQWO\UHGXFHDQLQWHUIHULQJFDUULHUDNF ()When multiple interfering carriers are encountered dur-LQJUHFHSWLRQ WKH'LJLWDO 1RWFK)LOWHU FDQVLJQL¿FDQWO\reduce the level of these signals.DNR (Digital Noise Reduction)7KH'63¶V'LJLWDO 1RLVH5HGXFWLRQ '15IHDWXUHXWL-OL]HVGLIIHUHQW PDWKHPDWLFDODOJRULWKPVWRDQDO\]HDQGVXSSUHVVGLIIHUHQWQRLVHSUR¿OHVHQFRXQWHUHGRQWKH+) 0+] EDQGV &KRRVH WKH VHOHFWLRQ WKDW SURYLGHVWKHEHVWQRLVHVXSSUHVVLRQDQGDOORZVWKHVLJQDOWRULVHup out of the noise.AGC7KH$*&V\VWHPLVKLJKO\DGDSWDEOHWRFKDQJLQJVLJQDODQGIDGLQJFKDUDFWHULVWLFVPDNLQJUHFHSWLRQSRVVLEOHXQGHUWKHPRVWGLI¿FXOWFRQGLWLRQV40.455 4553rd IF3rdFRONT END BLOCK DIAGRAM
Page 45FT DX 1200 OPERATING MANUALINTERFERENCE REJECTIONATT:KHQH[WUHPHO\VWURQJORFDOVLJQDOVRUKLJKQRLVHGHJUDGHVUHFHSWLRQ\RXFDQXVHWKH[ATT]EXWWRQWRLQVHUWRUG%RI5)DWWHQXDWLRQLQIURQWRIWKH5)DPSOL¿HU 3UHVV WKH [ATT] button several times to set the de-VLUHGDWWHQXDWLRQOHYHOSHUWKHFKDUWEHORZOFF $WWHQXDWRULV2II-6dB 7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\G%6LJQDOYROWDJHUHGXFHGE\-12dB7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\G%6LJQDOYROWDJHUHGXFHGWR-18dB7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\G%6LJQDOYROWDJHUHGXFHGWR The selected attenuation level will be indicated in the $77 FROXPQ RI WKH %ORFN 'LDJUDP 'LVSOD\ RQ WKHTFT display. 7R UHVWRUH IXOO VLJQDO VWUHQJWK WKURXJK WKH$WWHQXD-WRUFLUFXLWDUHDSUHVVWKH[ATT] button to restore the $77GLVSOD\WRWKH³2))´SRVLWLRQADVICE: ,IEDFNJURXQGQRLVHFDXVHVDKLJK6PHWHULQGLFDWLRQRQFOHDUIUHTXHQFLHVSUHVVWKH[ATT] button until the S-meter GURSVWRDERXW³6´7KLVVHWWLQJRSWLPL]HVWKHWUDGHRIIEHWZHHQVHQVLWLYLW\QRLVHDQGLQWHUIHUHQFHLPPXQLW\$OVRRQFH\RXKDYHWXQHGLQDVWDWLRQ\RXZDQWWRZRUN\RXPD\ZDQWWRUHGXFHVHQVLWLYLW\IXUWKHUDGGPRUHDWWHQXD-tion) by pressing the [ATT]EXWWRQWRDKLJKHUVHWWLQJ7KLVUHGXFHVWKHVWUHQJWKRIDOOVLJQDOVDQGQRLVHDQGFDQPDNHUHFHSWLRQPRUHFRPIRUWDEOHLPSRUWDQWHVSHFLDOO\GXULQJORQJ462V:KHQORRNLQJIRUZHDNVLJQDOVRQDTXLHWEDQG\RXZLOOZDQWPD[LPXPVHQVLWLYLW\VRWKH,32VKRXOGEHGLVDEOHGDQGWKH[ATT]EXWWRQVKRXOGEHVHWWR³2))´7KLVVLWXDWLRQLVW\SLFDOGXULQJTXLHWWLPHVRQIUHTXHQFLHVDERYH0+]DQGZKHQXVLQJDVPDOORUQHJDWLYHJDLQreceiving antenna on other bands.[ATT] Button
Page 46 FT DX 1200 OPERATING MANUALμ-TUNE FILTER (REQUIRES THE OPTIONAL RF μ TUNING KIT)7KH5)7XQLQJ.LWSURYLGHVXOWUDVKDUS5)VHOHFWLYLW\IRUWKHIURQWHQGRIWKHWUDQVFHLYHU9HU\KLJK4LVPDGHSRV-VLEOHE\WKHQDUURZEDQGGHVLJQ7KUHH5)7XQLQJ.LWVDUHDYDLODEOH7KHMTU-160FRYHUVWKH0+]EDQG7KHMTU-80/40FRYHUVWKHDQG0+]EDQGV7KHMTU-30/20FRYHUVDQG0+]EDQGV:KHQDQ\RUDOORIWKHWKUHHRSWLRQDOXQLWVDUHFRQQHFWHGWKH\ZLOOEHDXWRPDWLFDOO\DGMXVWHGWRFHQWHURQ\RXURSHUDW-LQJIUHTXHQF\7KHQDUURZEDQGZLGWKLVHVSHFLDOO\XVHIXORQWKHORZEDQGVZKHQPDQ\VWURQJ VLJQDOVDUHEHLQJUHFHLYHGYLD19,6SURSDJDWLRQ1HDU9HUWLFDO,QFLGHQFH6LJQDOVZLWKLQDQDUURZEDQGZLGWK7KHDGGHGSURWHFWLRQIRUWKH5)VWDJHLVHV-SHFLDOO\KHOSIXOLQSUHYHQWLQJ,0'DQGEORFNLQJμ-Tune Operation 3UHVVDQGKROGLQWKH[MHz/μT] button for one sec-RQGWRDFWLYDWHWKH7XQH¿OWHU7KH³μ-Tune´ZLOOappear on the TFT display. The [VFO-B/CLAR] NQREZRUNVDVWKH781,1*NQREADVICE: 7KH7XQHFLUFXLWZLOODXWRPDWLFDOO\DOLJQLWVHOIWRWKHRSHUDWLQJIUHTXHQF\ 5HPHPEHU WKDW 7XQH RQO\ RSHUDWHV RQ WKH 0+]DQGORZHUEDQGV 5RWDWHWKH[VFO-B/CLAR] knob to peak the re-VSRQVHEDFNJURXQGQRLVHRUUHGXFHLQWHUIHUHQFHADVICE: You may observe the relative peak point of the 7XQH ILOWHULQWKH7XQLQJ2IIVHW,QGLFDWRURQWKH9)2% IUHTXHQF\ GLVSOD\ ZKLOH WXQLQJ WKH[VFO-B/CLAR] knob. 7KHDPRXQWRIFKDQJHLQWKHFHQWHUIUHTXHQF\RI WKH 7XQHILOWHUZKHQURWDWLQJWKH [VFO-B/CLAR] NQRE FDQ EH FRQ¿JXUHG XVLQJ 0HQXLWHP³045 uTUNE DIAL STEP´ ,I WKH ȝ7XQH ILOWHU KDV EHHQ PDQXDOO\ DGMXVWHGDZD\IURPWKHFHQWHUIUHTXHQF\\RXPD\SUHVVthe [CLEAR] button to re-center the filter re-VSRQVHRQWKHFXUUHQWRSHUDWLQJIUHTXHQF\ 3UHVVDQGKROGLQWKH[MHz/μT] button for one sec-RQGWRGLVHQJDJHWKH7XQH¿OWHUADVICE: $OWHUQDWHSUHVVHVRIWKH[MHz/μT] button will switch WKH7XQH¿OWHUEHWZHHQRQRURIIADVICE:<RXPD\FKDQJHWKHLQGLFDWLRQRIWKH7XQLQJ2IIVHW,QGLFDWRUWRGLVSOD\ WKH7XQHILOWHUFRQWLQXRXVO\ZKLOHWKH7XQHILOWHULVDFWLYDWHG7KLV LV0HQXLWHP³010 BAR DISPLAY SELECT´6HHWKH%R[RQthe next page for details of the setting. 7KH 7XQH ¿OWHUV DUH WKH PRVW DGYDQFHG VHOHFWLYH5)SUHVHOHFWRU¿OWHUVHYHULQFRUSRUDWHGLQWRDQ$PD-WHXU 5DGLR WUDQVFHLYHU 7KH 5) VHOHFWLYLW\ SURYLGHGINTERFERENCE REJECTION[MHz/μT] Button[VFO-B/CLAR] ButtonE\7XQHFDQEHRIWUHPHQGRXVYDOXHLQHQVXU-LQJ TXLHW LQWHUPRGIUHH UHFHSWLRQ HYHQ LQ WKH PRVWFURZGHG EDQGV RQ D FRQWHVW ZHHNHQG 7KH 7XQH¿OWHUV SURYLGH 5) VHOHFWLYLW\ RQ WKH RUGHU RI D IHZGR]HQN+] DW G% DWWKH H[SHQVHRI DIHZ G% RIV\VWHP JDLQ RQ EDQGV ZKHUH QRLVH ¿JXUH LV VHOGRPDQLVVXH<RXZLOOQRWLFHWKDWWKH6PHWHUGHÀHFWLRQZKHQ7XQHLVHQJDJHGLV VOLJKWO\OHVV WKDQZKHQLWLVRXWRIWKHFLUFXLWWKLVLVQRUPDO,I\RXUDQWHQQDsystem gain is so low that you cannot hear the band QRLVHZKHQ7XQHLVHQJDJHGKLJKO\XQOLNHO\MXVWVZLWFKLWRXWWRHOLPLQDWHWKHVOLJKWLQVHUWLRQORVVTUNING OFFSET INDICATOR
Page 47FT DX 1200 OPERATING MANUALINTERFERENCE REJECTION-TUNE FILTER (REQUIRES THE OPTIONAL RF  TUNING KIT) $V\RXWXQHDURXQGRQDQDPDWHXUEDQGZLWKȝ7XQHHQJDJHGWKHPLFURSURFHVVRUDXWRPDWLFDOO\FRPPDQGVWKHVWHS-SHUPRWRUGULYLQJWKHWRURLGFRUHWRFHQWHUWKH¿OWHURQWKHFXUUHQWRSHUDWLQJIUHTXHQF\+RZHYHU\RXPD\XVHWKH[VFO-B/CLAR]NQREWRVNHZWKH¿OWHUUHVSRQVHWRRQHVLGHRUWKHRWKHURIWKHRSHUDWLQJIUHTXHQF\WRGHDOZLWKKHDY\LQWHUIHUHQFHRQRQHVLGH7RUHFHQWHUWKH7XQH¿OWHURQWKHRSHUDWLQJIUHTXHQF\DQGHOLPLQDWHDQ\RIIVHWpress the [CLEAR] button.Changing the Tuning Offset Indicator 3UHVVWKH[MENU] EXWWRQWRHQJDJHWKH0HQXmode. 5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKHSTEXWWRQWRVHOHFW0HQXLWHP³010 BAR DIS-PLAY SELECT´ 3UHVVWKH[SELECT] button. 5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKHSTEXWWRQWRVHOHFW³µTUNE7XQH´UH-SODFLQJ WKH GHIDXOW ³CW TUNE &:781,1*´selection). 3UHVV WKH [SELECT]EXWWRQWKHQSUHVVWKH[MENU] button to lock in the new setting and exit to normal operation.[MENU] Button[VFO-B/CLAR] Knob
Page 48 FT DX 1200 OPERATING MANUALIPO (INTERCEPT POINT OPTIMIZATION)7KH,32IHDWXUHDOORZVWKHRSHUDWRUWRRSWLPL]HWKHFKDUDFWHULVWLFVRIWKHUHFHLYHUIURQWHQGGHSHQGLQJRQWKHFXUUHQWnoise level and the strength of incoming signals.3UHVV WKH [IPO]EXWWRQUHSHDWHGO\WRVHWWKHGHVLUHGFKDUDFWHULVWLFRIWKHUHFHLYHUIURQWHQGDFFRUGLQJWRWKHchart below.AMP1$PSOL¿HVWKHLQFRPLQJVLJQDOVXVLQJDORZGLVWRUWLRQ5) SUHDPSOL¿HUJDLQ DSSUR[dB).AMP2$PSOLILHVWKHLQFRPLQJVLJQDOVXVLQJDVWDJHORZGLVWRUWLRQ5)SUHDPSOL¿HUWRWDOJDLQDSSUR[G%IPO %\SDVVHVWKH5)SUHDPSOL¿HU\LHOGLQJGLUHFWIHHGWRWKH¿UVWPL[HU7KHVHOHFWHGUHFHLYHU5)SUHDPSOL¿HUZLOOEHLQGLFDWHGLQWKH,32FROXPQRIWKH%ORFN'LDJUDP'LVSOD\RQWKHTFT display.ADVICE: 2QWKH0+]DQGORZHUEDQGVLWJHQHUDOO\LVQRWQHFHVVDU\WRXVHDQ\SUHDPSOL¿HUDWDOOVHOHFWLQJWKH³,32´SRVLWLRQDV GHVFULEHGDERYHZLOOLQFUHDVH WKHVWURQJVLJQDOKDQGOLQJFDSDELOLW\RIWKHUHFHLYHUDQGgenerally will result in more pleasant reception due to reduced noise. If you can hear band noise with the SUHDPSOL¿HUVGLVHQJDJHGWKHQDSUHDPSOL¿HULVJHQ-erally not needed.NOTE:7KH,32IHDWXUH LVDOZD\VRQ³,32´ 1R5)SUHDPSOL-¿HUEHWZHHQN+]DQG0+]INTERFERENCE REJECTION[IPO] Button
Page 49FT DX 1200 OPERATING MANUALINTERFERENCE REJECTIONR.FLT (ROOFING FILTERS)1DUURZEDQG5RR¿QJ)LOWHUVRIN+]N+]N+]EDQGZLGWKVDUHSURYLGHGLQWKH¿UVW,)ULJKWDIWHUWKH¿UVWPL[HU7KHVH¿OWHUVSURYLGHSURWHFWLRQIRU WKHQGPL[HU'63DQG RWKHUFLUFXLWU\WKDWIROORZDQGFDQGUDPDWLFDOO\LPSURYHUHFHSWLRQRQDYHU\FURZGHGEDQGGXULQJDFRQWHVWHWF7\SLFDOO\WKH$872VHOHFWLRQPRGHLVVDWLVIDFWRU\IRUPRVWoperating situations.3UHVV WKH [R.FLT] EXWWRQWRWRJJOH WKH5RRILQJ )LOWHUselection.AUTO*1 Æ 3 kHz Æ 6 kHz Æ 15 kHz Æ AUTO ..... 7KH ³$872´ VHOHFWLRQ PRGH VHOHFWV WKH RSWLPXP EDQGZLGWK RIWKH5RR¿QJ¿OWHUIRUWKHUHFHSWLRQPRGH ,Q WKLV FDVH WKH VHOHFWHG EDQGZLGWK LQ WKH 5)/7 FROXPQ RI WKH%ORFN'LDJUDP'LVSOD\JORZV\HOORZ1RUPDOO\JORZV%OXHADVICE: ,QWKH$0)0PRGHRQO\WKHN+]5RR¿QJ)LOWHULVXWLOL]HG $V\RXUHSHDWHGO\SUHVVWKH[R.FLT]EXWWRQWKHVHOHFWHG5RR¿QJ)LOWHU EDQGZLGWKZLOOEH GLVSOD\HGLQWKH5)/7FROXPQRIWKH%ORFN'LDJUDP'LVSOD\RQWKH7)7GLVSOD\GHQRWLQJWKH5RR¿QJ)LOWHUFXU-rently in use. 7\SLFDOO\WKLVVHOHFWLRQZLOOEHVHWWR³$872´QUICK POINT:7KH³$872´VHOHFWLRQRIWKH5RR¿QJ)LOWHULVEDVHGRQWKHRSHUDWLQJPRGH+RZHYHU\RXPD\RYHUULGHWKHDX-WRPDWLFVHOHFWLRQLIEDQGFRQGLWLons warrant a different XVXDOO\DWLJKWHUVHOHFWLRQ[R.FLT] ButtonTERMINOLOGY:$³5RR¿QJ)LOWHU´DVLWVQDPHLPSOLHVSODFHVD³5RRI´over the receiver IF system bandwidth. Starting at the ¿UVWPL[HUWKH5RR¿QJ¿OWHUSURWHFWVWKHFLUFXLWU\GRZQ-VWUHDPIURPVWURQJVLJQDOVMXVWDVDURRIRQDKRXVHprotects the contents from rain and snow.
Page 50 FT DX 1200 OPERATING MANUALIF NOISE BLANKER (NB) OPERATIONThe FTDX1200LQFOXGHVDQHIIHFWLYH,)1RLVH%ODQNHUZKLFKFDQVLJQL¿FDQWO\UHGXFHQRLVHFDXVHGE\DXWRPRWLYHLJQL-tion systems. 3UHVVWKH [NB]EXWWRQEULHÀ\ WRUHGXFH short dura-tion pulse noise VXFK DV IURP VZLWFKLQJ WUDQVLHQWVDXWRPRELOHLJQLWLRQVDQGSRZHUOLQHV7KH³NB ON´ZLOODSSHDULQWKHGLVSOD\WRFRQ¿UPWKDWWKH1DUURZ1%LVRSHUDWLQJ 3UHVVWKH[NB] button again to reduce longer-dura-tion man-made pulse noise 7KH ³NBW ON´ ZLOODSSHDULQWKHGLVSOD\WRFRQ¿UPWKDWWKH:LGH1%LVoperating. ,I GHVLUHG \RX PD\ DGMXVW WKH 1RLVH %ODQNHU OHYHOYLD 0HQX LWHP ³033 NB LEVEL´ WR WKH SRLQW ZKHUHthe offending noise is best reduced or eliminated. See box below for details. 7RHQG1RLVH%ODQNHURSHUDWLRQSUHVVWKH[NB] but-WRQ RQFH PRUH 7KH ³NB OFF´ ZLOO DSSHDU LQ WKHGLVSOD\FRQ¿UPLQJWKDWWKH1RLVH%ODQNHULVQRORQ-ger in operation.ADVICE:7KH1RLVH%ODQNHU OHYHOLVWKHVDPH IRUERWK9)2$DQG9)2%Adjusting the Noise Blanker Level 3UHVVWKH[MENU] EXWWRQWRHQJDJHWKH0HQXmode. 5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKHSTEXWWRQWRVHOHFW0HQXLWHP³033 NB LEV-EL´ 3UHVVWKH[SELECT] button 5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKHST button) to the point where the offending noise is best reduced or eliminated. 3UHVV WKH [SELECT]EXWWRQWKHQSUHVVWKH[MENU] button to lock in the new setting and exit to normal operation.INTERFERENCE REJECTION[NB] Button[MENU] Button[VFO-B/CLAR] Knob
Page 51FT DX 1200 OPERATING MANUALINTERFERENCE REJECTIONCONTOUR CONTROL OPERATION7KH&RQWRXU¿OWHUV\VWHPSURYLGHVDJHQWOHSHUWXUEDWLRQRIWKH,)¿OWHUSDVVEDQG7KH&RQWRXULVVHWWRHLWKHUVXSSUHVVRUERRVWVSHFL¿FIUHTXHQF\FRPSRQHQWVDQGWKXVHQKDQFHVWKHVRXQGDQGUHDGDELOLW\RIDUHFHLYHGVLJQDO 3UHVVWKH [CONT/APF] button to activate the Con-WRXU ¿OWHU 7KH '63 JUDSKLF GLVSOD\ ZLOO LOOXPLQDWHDQGWKH FXUUHQW³QXOO´ RU³SHDN´ SRVLWLRQRI WKH&RQWRXU¿OWHUZLOODSSHDULQWKH&217285LQGLFDtor on the display. 5RWDWH WKH [CONT/APF] knob to achieve the most natural-sounding audio reproduction on the incom-ing signal.ADVICE: 7KH GLVSOD\ ZLOO VKRZ WKH &RQWRXU IUHTXHQF\ IRU seconds whenever the [CONT/APF] knob is turned. 7R FDQFHO &RQWRXU WXQLQJ SUHVV WKH [CONT/APF] button momentarily.ADVICE: $OWHUQDWHSUHVVHVRI WKH[CONT/APF] button will VZLWFKWKH&RQWRXU¿OWHUEHWZHHQRQDQGRIIADVICE: 7KH&RQWRXU¿OWHUOHYHOHLWKHUDQXOORUDSHDNPD\EH DGMXVWHG XVLQJ 0HQX LWHP ³107 CONTOUR LEV-EL´7KH IDFWRU\GHIDXOW VHWWLQJ LV IRUD QXOO RI±G% 7KH EDQGZLGWK RYHU ZKLFK WKH &RQWRXU ¿OWHU HIIHFWLVDSSOLHGPD\ EHDGMXVWHGXVLQJ 0HQXLWHP³108 CONTOUR WIDTH´7KHIDFWRU\GHIDXOWVHWWLQJLV5HIHUWR)LJXUH³B´ WKLVLOOXVWUDWHVDQ³LQGHQWDWLRQ´RIWKH&RQWRXUILOWHULQWKHFHQWHURIthe passband. The Contour filter places a low-4³QRWFK´ LQ WKHSDVVEDQGSHUWKHVHWWLQJVRI0HQXLWHPV³107 CONTOUR LEVEL´ DQG ³108 CONTOUR WIDTH´UHIHUHQFHGDERYH&RXQWHUFORFNZLVHURWDWLRQWRWKHOHIWRIWKH[CONT/APF] knob causes the notch to move toware D ORZHUIUHTXHQF\ZLWKLQWKHSDVVEDQGZKLOHFORFNZLVHURWDWLRQWRWKHULJKWFDXVHVWKHQRWFKWRPRYH WRZDUGD KLJKHUIUHTXHQF\ ZLWKLQWKHpassband. By removing interference or unwanted IUHTXHQF\FRPSRQHQWVRIWKHLQFRPLQJVLJQDOit is possible to make the desired signal rise out RI WKH EDFNJURXQG QRLVHLQWHUIHUHQFH HQKDQFLQJintelligibility.QUICK POINT:%\MXGLFLRXVXVHRIWKH&RQWRXU¿OWHUWKH³VKRXOGHU´RIWKHSDVVEDQGUHVSRQVHPD\EHDOWHUHGRUFRPSRQHQWVPD\EHUHPRYHGIURPZLWKLQWKHSDVVEDQGDOORZLQJWKHGHVLUHGVLJQDOWRULVHDERYHWKHEDFNJURXQGQRLVHDQGLQWHUIHUHQFHLQDPDQQHUQRWREWDLQDEOHZLWKRWKHU¿OWHULQJV\VWHPV[CONT/APF] ButtonIF BANDWIDTH IF BANDWIDTH IF BANDWIDTHCONT/APF CONT/APF CONT/APF[CONT/APF] Knob A B CCONTOUR INDICATOR
Page 52 FT DX 1200 OPERATING MANUALIF BANDWIDTHDesired Signal Desired Signal Desired SignalQRMQRMIF BANDWIDTH IF BANDWIDTHSHIFT SHIFT SHIFTINTERFERENCE REJECTIONIF SHIFT OPERATION (SSB/CW/RTTY/PKT/AM MODES),)6+,)7DOORZV\RXWRPRYHWKH'63¿OWHUSDVVEDQGKLJKHURUORZHUZLWKRXWFKDQJLQJWKHSLWFKRIWKHLQFRPLQJVLJQDODQGWKXVUHGXFHVRUHOLPLQDWHVLQWHUIHUHQFH%HFDXVHWKHFDUULHUWXQLQJIUHTXHQF\LVQRWYDULHGWKHUHLVQRQHHGWRUHWXQHWKHRSHUDWLQJIUHTXHQF\WRHOLPLQDWHWKHLQWHUIHUHQFH7KHWRWDOSDVVEDQGWXQLQJUDQJHIRUWKH,)6+,)7V\VWHPLVN+] 5RWDWH WKH [SHIFT] knob to the left or right to re-duce the interference.ADVICE: The display will show the shift value of the IF SHIFT for 3 seconds whenever the [SHIFT] knob is turned.ADVICE:The center position of the IF passband will be memo-UL]HGLQGHSHQGHQWO\ RQ HDFK9)2VWDFNRI9)2$ DQG9)2%5HIHUULQJWR)LJXUH³A´QRWHWKHGHSLFWLRQRIWKH,)'63¿OWHUDVWKHWKLFNOLQHZLWKWKH[SHIFT] NQRELQWKHR¶FORFNSRVLWLRQ,Q)LJXUH³B´DQinterfering signal has appeared inside the original SDVVEDQG ,Q )LJXUH ³C´ \RX FDQ VHH WKH HIIHFWof rotating the [SHIFT] knob. The interference OHYHOLVUHGXFHGE\PRYLQJWKH¿OWHUSDVVEDQGVRthat the interference is outside of the passband.[SHIFT] Knob A B CSHIFT INDICATOR
Page 53FT DX 1200 OPERATING MANUAL A B CINTERFERENCE REJECTIONWIDTH (IF DSP BANDWIDTH) TUNING (SSB/CW/RTTY/DATA MODES)7KH,):,'7+WXQLQJV\VWHPDOORZV\RXWRYDU\WKHZLGWKRIWKH'63,)SDVVEDQGWRUHGXFHRUHOLPLQDWHLQWHUIHUHQFH0RUHRYHUWKHEDQGZLGWKPD\DFWXDOO\EHexpandedIURPLWVGHIDXOWVHWWLQJVKRXOG\RXZLVKWRHQKDQFHLQFRPLQJVLJQDO¿GHOLW\ZKHQLQWHUIHUHQFHRQWKHEDQGLVORZ 5RWDWHWKH [WIDTH] knob to the left or right to re-duce the interference.ADVICE: 7KH IUHTXHQF\ GLVSOD\ ZLOO VKRZ WKH EDQGZLGWK RIthe IF passband for 3 seconds whenever the [WIDTH] knob is turned.[WIDTH] Knob5HIHUULQJWR)LJXUH³B´\RXFDQVHHWKHGHIDXOWbandwidth on the SSB mode.By rotating the [WIDTH]NQREWRWKHOHIW WKHEDQGZLGWKZLOO QDUURZVHH)LJXUH ³A´ZKLOHrotation of the [WIDTH] NQRE WRWKHULJKW DVGHSLFWHG LQ )LJXUH ³C´ ZLOO LQFUHDVH WKH EDQGwidth. A B C7KHGHIDXOWEDQGZLGWKVDQGWRWDOEDQGZLGWKDGMXVWPHQWUDQJHZLOOYDU\DFFRUGLQJWRWKHRSHUDWLQJPRGH66%0RGHN+]aN+]GHIDXOWN+]&:0RGH+]aN+]GHIDXOWN+]577<'$7$0RGHV+]aN+]GHIDXOW+]Using IF SHIFT and WIDTH Together7KH,) 6+,)7DQG9DULDEOH ,):,'7+IHDWXUHVWRJHWKHUIRUPDYHU\HIIHFWLYHLQWHUIHUHQFH¿JKWLQJ¿OWHULQJV\VWHP)RUH[DPSOHLQ )LJXUH³A´\RXFDQVHHKRZinterference has appeared both on the high DQGORZVLGHVRIWKHGHVLUHGVLJQDO 5RWDWHWKH[WIDTH]NQREWKHLQWHUIHUHQFHIURP RQHVLGHFDQEH HOLPLQDWHG)LJXUH³B´ 1H[WURWDWH WKH[SHIFT]NQREWRUHSRVLWLRQWKHSDVVEDQG)LJXUH³C´WKHLQWHUIHUHQFHRQWKHRSSRVLWHVLGHFDQEHUHPRYHGZLWKRXWUHLQWURGXFLQJWKHLQWHUIHUHQFHSUHYLRXVO\HOLPLQDWHGLQ)LJXUH³B´ADVICE: )RUEHVWLQWHUIHUHQFHUHGXFWLRQWKH:,'7+DQGSHIFT features are the primary tools you should XVHDIWHUQDUURZLQJWKHEDQGZLGWK:,'7+DQGRUDGMXVWLQJWKHFHQWHURIWKHSDVVEDQG6+,)77KH&RQWRXUFRQWUROPD\ WKHQ\LHOGadditional signal-enhancement benefits on WKH QHW UHVLGXDO EDQGZLGWK (YHQ PRUH WKH ,)127&+)LOWHUGHVFULEHGODWHUPD\DOVREHXVHGLQFRQMXQFWLRQZLWKWKHVH¿OWHUV\VWHPVWRVLJQL¿FDQWDGYDQWDJHWIDTH INDICATORIF BANDWIDTH IF BANDWIDTH IF BANDWIDTHSHIFT SHIFT SHIFT Desired Signal Desired Signal Desired SignalQRMQRMQRMQRMQRMQRMIF BANDWIDTH IF BANDWIDTH IF BANDWIDTH

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