Yaesu Musen 20581X50 HF/50 MHz Transceiver User Manual FTDX1200 Operating Manual
Yaesu Musen Co., Ltd. HF/50 MHz Transceiver FTDX1200 Operating Manual
Contents
Users Manual 4
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Page 44 FT DX 1200 OPERATING MANUAL
CONVENIENCE FEATURES
RECEIVER 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-
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FRQWUROVLVVRPHZKDWRIDQDUWUHTXLULQJIDPLOLDULW\ZLWKWKHW\SHVRILQWHUIHUHQFHDQGWKHVXEWOHHIIHFWVRIVRPHRIWKH
FRQWUROV7KHUHIRUHWKH IROORZLQJLQIRUPDWLRQ LVSURYLGHG DVD JHQHUDOJXLGHOLQH IRUW\SLFDO VLWXDWLRQVDQG DVWDUWLQJ
point for your own experimentation.
The FTDX1200LQWHUIHUHQFH¿JKWLQJ FLUFXLWU\EHJLQV LQ LWV ³5)´VWDJHV DQG FRQWLQXHVWKURXJKRXW WKH HQWLUHUHFHLYHU
section. FTDX1200DOORZVFRQ¿JXUDWLRQRIWKHIHDWXUHVGHVFULEHGEHORZ
R. FLT ()
7KUHH5RRILQJILOWHUVRIN+]N+]DQGN+]
EDQGZLGWKVDUH SURYLGHGLQ WKH)LUVW ,)ULJKWDIWHU WKH
first mixer. These filters are automatically selected to
provide narrow-band selectivity to protect the following
,)DQG'63VWDJHV7KHDXWRPDWLFDOO\VHOHFWHG¿OWHUPD\
EHPDQXDOO\FKDQJHGE\WKHRSHUDWRULIGHVLUHGIRUVSH-
cial operating circumstances.
CONTOUR Filter
7KH'63 &RQWRXUILOWHUKDVWKHXQLTXHDELOLW\ WRSUR-
vide either a null or a peak in tunable segments of the
receiver passband. You may suppress interference and
H[FHVVLYHIUHTXHQF\FRPSRQHQWVRQDQLQFRPLQJVLJQDO
RU\RXPD\SHDNWKRVHWXQDEOHIUHTXHQF\VHJPHQWV7KH
OHYHORIWKHQXOORUSHDNDQGWKHEDQGZLGWKRYHUZKLFK
LWLVDSSOLHGDUHDGMXVWDEOHYLDWKH0HQX
IF SHIFT
7KHSDVVEDQGFHQWHUIUHTXHQF\RIWKH,)'63¿OWHUPD\
be moved up or down by adjusting this control.
IF WIDTH
7KHZLGWKRIWKH,)'63¿OWHULQJPD\EHDGMXVWHGXVLQJ
this control.
IF NOTCH
7KH,)1RWFK¿OWHULVDKLJK4QRWFK¿OWHUWKDWFDQHOLP-
LQDWHRUVLJQL¿FDQWO\UHGXFHDQLQWHUIHULQJFDUULHU
DNF ()
When multiple interfering carriers are encountered dur-
LQJUHFHSWLRQ WKH'LJLWDO 1RWFK)LOWHU FDQVLJQL¿FDQWO\
reduce the level of these signals.
DNR (Digital Noise Reduction)
7KH'63¶V'LJLWDO 1RLVH5HGXFWLRQ '15IHDWXUHXWL-
OL]HVGLIIHUHQW PDWKHPDWLFDODOJRULWKPVWRDQDO\]H
DQGVXSSUHVVGLIIHUHQWQRLVHSUR¿OHVHQFRXQWHUHGRQWKH
+) 0+] EDQGV &KRRVH WKH VHOHFWLRQ WKDW SURYLGHV
WKHEHVWQRLVHVXSSUHVVLRQDQGDOORZVWKHVLJQDOWRULVH
up out of the noise.
AGC
7KH$*&V\VWHPLVKLJKO\DGDSWDEOHWRFKDQJLQJVLJQDO
DQGIDGLQJFKDUDFWHULVWLFVPDNLQJUHFHSWLRQSRVVLEOH
XQGHUWKHPRVWGLI¿FXOWFRQGLWLRQV
40.455 455
3rd IF
3rd
FRONT END BLOCK DIAGRAM
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Page 45FT DX 1200 OPERATING MANUAL
INTERFERENCE REJECTION
ATT
:KHQH[WUHPHO\VWURQJORFDOVLJQDOVRUKLJKQRLVHGHJUDGHVUHFHSWLRQ\RXFDQXVHWKH[ATT]EXWWRQWRLQVHUWRU
G%RI5)DWWHQXDWLRQLQIURQWRIWKH5)DPSOL¿HU
3UHVV WKH [ATT] button several times to set the de-
VLUHGDWWHQXDWLRQOHYHOSHUWKHFKDUWEHORZ
OFF $WWHQXDWRULV2II
-6dB 7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\
G%6LJQDOYROWDJHUHGXFHGE\
-12dB7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\
G%6LJQDOYROWDJHUHGXFHGWR
-18dB7KHLQFRPLQJVLJQDOSRZHULVUHGXFHGE\
G%6LJQDOYROWDJHUHGXFHGWR
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-
WRUFLUFXLWDUHDSUHVVWKH[ATT] button to restore the
$77GLVSOD\WRWKH³2))´SRVLWLRQ
ADVICE:
,IEDFNJURXQGQRLVHFDXVHVDKLJK6PHWHULQGLFDWLRQRQFOHDUIUHTXHQFLHVSUHVVWKH[ATT] button until the S-meter
GURSVWRDERXW³6´7KLVVHWWLQJRSWLPL]HVWKHWUDGHRIIEHWZHHQVHQVLWLYLW\QRLVHDQGLQWHUIHUHQFHLPPXQLW\$OVR
RQFH\RXKDYHWXQHGLQDVWDWLRQ\RXZDQWWRZRUN\RXPD\ZDQWWRUHGXFHVHQVLWLYLW\IXUWKHUDGGPRUHDWWHQXD-
tion) by pressing the [ATT]EXWWRQWRDKLJKHUVHWWLQJ7KLVUHGXFHVWKHVWUHQJWKRIDOOVLJQDOVDQGQRLVHDQGFDQ
PDNHUHFHSWLRQPRUHFRPIRUWDEOHLPSRUWDQWHVSHFLDOO\GXULQJORQJ462V:KHQORRNLQJIRUZHDNVLJQDOVRQDTXLHW
EDQG\RXZLOOZDQWPD[LPXPVHQVLWLYLW\VRWKH,32VKRXOGEHGLVDEOHGDQGWKH[ATT]EXWWRQVKRXOGEHVHWWR³2))´
7KLVVLWXDWLRQLVW\SLFDOGXULQJTXLHWWLPHVRQIUHTXHQFLHVDERYH0+]DQGZKHQXVLQJDVPDOORUQHJDWLYHJDLQ
receiving antenna on other bands.
[ATT] Button
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Page 46 FT DX 1200 OPERATING MANUAL
μ-TUNE FILTER (REQUIRES THE OPTIONAL RF μ TUNING KIT)
7KH5)7XQLQJ.LWSURYLGHVXOWUDVKDUS5)VHOHFWLYLW\IRUWKHIURQWHQGRIWKHWUDQVFHLYHU9HU\KLJK4LVPDGHSRV-
VLEOHE\WKHQDUURZEDQGGHVLJQ7KUHH5)7XQLQJ.LWVDUHDYDLODEOH7KHMTU-160FRYHUVWKH0+]EDQG7KH
MTU-80/40FRYHUVWKHDQG0+]EDQGV7KHMTU-30/20FRYHUVDQG0+]EDQGV
:KHQDQ\RUDOORIWKHWKUHHRSWLRQDOXQLWVDUHFRQQHFWHGWKH\ZLOOEHDXWRPDWLFDOO\DGMXVWHGWRFHQWHURQ\RXURSHUDW-
LQJIUHTXHQF\
7KHQDUURZEDQGZLGWKLVHVSHFLDOO\XVHIXORQWKHORZEDQGVZKHQPDQ\VWURQJ VLJQDOVDUHEHLQJUHFHLYHGYLD19,6
SURSDJDWLRQ1HDU9HUWLFDO,QFLGHQFH6LJQDOVZLWKLQDQDUURZEDQGZLGWK7KHDGGHGSURWHFWLRQIRUWKH5)VWDJHLVHV-
SHFLDOO\KHOSIXOLQSUHYHQWLQJ,0'DQGEORFNLQJ
μ-Tune Operation
3UHVVDQGKROGLQWKH[MHz/μT] button for one sec-
RQGWRDFWLYDWHWKH7XQH¿OWHU7KH³μ-Tune´ZLOO
appear on the TFT display. The [VFO-B/CLAR]
NQREZRUNVDVWKH781,1*NQRE
ADVICE:
7KH7XQHFLUFXLWZLOODXWRPDWLFDOO\DOLJQLWVHOI
WRWKHRSHUDWLQJIUHTXHQF\
5HPHPEHU WKDW 7XQH RQO\ RSHUDWHV RQ WKH
0+]DQGORZHUEDQGV
5RWDWHWKH[VFO-B/CLAR] knob to peak the re-
VSRQVHEDFNJURXQGQRLVHRUUHGXFHLQWHUIHUHQFH
ADVICE:
You may observe the relative peak point of the
7XQH ILOWHULQWKH7XQLQJ2IIVHW,QGLFDWRURQ
WKH9)2% IUHTXHQF\ GLVSOD\ ZKLOH WXQLQJ WKH
[VFO-B/CLAR] knob.
7KHDPRXQWRIFKDQJHLQWKHFHQWHUIUHTXHQF\
RI WKH 7XQHILOWHUZKHQURWDWLQJWKH [VFO-
B/CLAR] NQRE FDQ EH FRQ¿JXUHG XVLQJ 0HQX
LWHP³045 uTUNE DIAL STEP´
,I WKH ȝ7XQH ILOWHU KDV EHHQ PDQXDOO\ DGMXVWHG
DZD\IURPWKHFHQWHUIUHTXHQF\\RXPD\SUHVV
the [CLEAR] button to re-center the filter re-
VSRQVHRQWKHFXUUHQWRSHUDWLQJIUHTXHQF\
3UHVVDQGKROGLQWKH[MHz/μT] button for one sec-
RQGWRGLVHQJDJHWKH7XQH¿OWHU
ADVICE:
$OWHUQDWHSUHVVHVRIWKH[MHz/μT] button will switch
WKH7XQH¿OWHUEHWZHHQRQRURII
ADVICE:
<RXPD\FKDQJHWKHLQGLFDWLRQRIWKH7XQLQJ2IIVHW
,QGLFDWRUWRGLVSOD\ WKH7XQHILOWHUFRQWLQXRXVO\
ZKLOHWKH7XQHILOWHULVDFWLYDWHG7KLV LV0HQX
LWHP³010 BAR DISPLAY SELECT´6HHWKH%R[RQ
the next page for details of the setting.
7KH 7XQH ¿OWHUV DUH WKH PRVW DGYDQFHG VHOHFWLYH
5)SUHVHOHFWRU¿OWHUVHYHULQFRUSRUDWHGLQWRDQ$PD-
WHXU 5DGLR WUDQVFHLYHU 7KH 5) VHOHFWLYLW\ SURYLGHG
INTERFERENCE REJECTION
[MHz/μT] Button
[VFO-B/CLAR] Button
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LQJ TXLHW LQWHUPRGIUHH UHFHSWLRQ HYHQ LQ WKH PRVW
FURZGHG EDQGV RQ D FRQWHVW ZHHNHQG 7KH 7XQH
¿OWHUV SURYLGH 5) VHOHFWLYLW\ RQ WKH RUGHU RI D IHZ
GR]HQN+] DW G% DWWKH H[SHQVHRI DIHZ G% RI
V\VWHP JDLQ RQ EDQGV ZKHUH QRLVH ¿JXUH LV VHOGRP
DQLVVXH<RXZLOOQRWLFHWKDWWKH6PHWHUGHÀHFWLRQ
ZKHQ7XQHLVHQJDJHGLV VOLJKWO\OHVV WKDQZKHQ
LWLVRXWRIWKHFLUFXLWWKLVLVQRUPDO,I\RXUDQWHQQD
system gain is so low that you cannot hear the band
QRLVHZKHQ7XQHLVHQJDJHGKLJKO\XQOLNHO\MXVW
VZLWFKLWRXWWRHOLPLQDWHWKHVOLJKWLQVHUWLRQORVV
TUNING OFFSET INDICATOR
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Page 47FT DX 1200 OPERATING MANUAL
INTERFERENCE REJECTION
-TUNE FILTER (REQUIRES THE OPTIONAL RF TUNING KIT)
$V\RXWXQHDURXQGRQDQDPDWHXUEDQGZLWKȝ7XQHHQJDJHGWKHPLFURSURFHVVRUDXWRPDWLFDOO\FRPPDQGVWKHVWHS-
SHUPRWRUGULYLQJWKHWRURLGFRUHWRFHQWHUWKH¿OWHURQWKHFXUUHQWRSHUDWLQJIUHTXHQF\+RZHYHU\RXPD\XVHWKH
[VFO-B/CLAR]NQREWRVNHZWKH¿OWHUUHVSRQVHWRRQHVLGHRUWKHRWKHURIWKHRSHUDWLQJIUHTXHQF\WRGHDOZLWK
KHDY\LQWHUIHUHQFHRQRQHVLGH7RUHFHQWHUWKH7XQH¿OWHURQWKHRSHUDWLQJIUHTXHQF\DQGHOLPLQDWHDQ\RIIVHW
press the [CLEAR] button.
Changing the Tuning Offset Indicator
3UHVVWKH[MENU] EXWWRQWRHQJDJHWKH0HQX
mode.
5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKH
STEXWWRQWRVHOHFW0HQXLWHP³010 BAR DIS-
PLAY SELECT´
3UHVVWKH[SELECT] button.
5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKH
STEXWWRQWRVHOHFW³µTUNE7XQH´UH-
SODFLQJ WKH GHIDXOW ³CW TUNE &:781,1*´
selection).
3UHVV WKH [SELECT]EXWWRQWKHQSUHVVWKH
[MENU] button to lock in the new setting and
exit to normal operation.
[MENU] Button
[VFO-B/CLAR] Knob
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Page 48 FT DX 1200 OPERATING MANUAL
IPO (INTERCEPT POINT OPTIMIZATION)
7KH,32IHDWXUHDOORZVWKHRSHUDWRUWRRSWLPL]HWKHFKDUDFWHULVWLFVRIWKHUHFHLYHUIURQWHQGGHSHQGLQJRQWKHFXUUHQW
noise level and the strength of incoming signals.
3UHVV WKH [IPO]EXWWRQUHSHDWHGO\WRVHWWKHGHVLUHG
FKDUDFWHULVWLFRIWKHUHFHLYHUIURQWHQGDFFRUGLQJWRWKH
chart below.
AMP1$PSOL¿HVWKHLQFRPLQJVLJQDOVXVLQJDORZ
GLVWRUWLRQ5) SUHDPSOL¿HUJDLQ DSSUR[
dB).
AMP2$PSOLILHVWKHLQFRPLQJVLJQDOVXVLQJD
VWDJHORZGLVWRUWLRQ5)SUHDPSOL¿HUWRWDO
JDLQDSSUR[G%
IPO %\SDVVHVWKH5)SUHDPSOL¿HU\LHOGLQJGLUHFW
IHHGWRWKH¿UVWPL[HU
7KHVHOHFWHGUHFHLYHU5)SUHDPSOL¿HUZLOOEHLQGLFDWHG
LQWKH,32FROXPQRIWKH%ORFN'LDJUDP'LVSOD\RQWKH
TFT display.
ADVICE:
2QWKH0+]DQGORZHUEDQGVLWJHQHUDOO\LVQRW
QHFHVVDU\WRXVHDQ\SUHDPSOL¿HUDWDOOVHOHFWLQJWKH
³,32´SRVLWLRQDV GHVFULEHGDERYHZLOOLQFUHDVH WKH
VWURQJVLJQDOKDQGOLQJFDSDELOLW\RIWKHUHFHLYHUDQG
generally will result in more pleasant reception due
to reduced noise. If you can hear band noise with the
SUHDPSOL¿HUVGLVHQJDJHGWKHQDSUHDPSOL¿HULVJHQ-
erally not needed.
NOTE:
7KH,32IHDWXUH LVDOZD\VRQ³,32´ 1R5)SUHDPSOL-
¿HUEHWZHHQN+]DQG0+]
INTERFERENCE REJECTION
[IPO] Button
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Page 49FT DX 1200 OPERATING MANUAL
INTERFERENCE REJECTION
R.FLT (ROOFING FILTERS)
1DUURZEDQG5RR¿QJ)LOWHUVRIN+]N+]N+]EDQGZLGWKVDUHSURYLGHGLQWKH¿UVW,)ULJKWDIWHUWKH¿UVWPL[HU
7KHVH¿OWHUVSURYLGHSURWHFWLRQIRU WKHQGPL[HU'63DQG RWKHUFLUFXLWU\WKDWIROORZDQGFDQGUDPDWLFDOO\LPSURYH
UHFHSWLRQRQDYHU\FURZGHGEDQGGXULQJDFRQWHVWHWF7\SLFDOO\WKH$872VHOHFWLRQPRGHLVVDWLVIDFWRU\IRUPRVW
operating situations.
3UHVV WKH [R.FLT] EXWWRQWRWRJJOH WKH5RRILQJ )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
WKH5RR¿QJ¿OWHUIRUWKHUHFHSWLRQPRGH
,Q WKLV FDVH WKH VHOHFWHG EDQGZLGWK LQ WKH 5)/7 FROXPQ RI WKH
%ORFN'LDJUDP'LVSOD\JORZV\HOORZ1RUPDOO\JORZV%OXH
ADVICE:
,QWKH$0)0PRGHRQO\WKHN+]5RR¿QJ)LOWHU
LVXWLOL]HG
$V\RXUHSHDWHGO\SUHVVWKH[R.FLT]EXWWRQWKH
VHOHFWHG5RR¿QJ)LOWHU EDQGZLGWKZLOOEH GLVSOD\HG
LQWKH5)/7FROXPQRIWKH%ORFN'LDJUDP'LVSOD\
RQWKH7)7GLVSOD\GHQRWLQJWKH5RR¿QJ)LOWHUFXU-
rently in use.
7\SLFDOO\WKLVVHOHFWLRQZLOOEHVHWWR³$872´
QUICK POINT:
7KH³$872´VHOHFWLRQRIWKH5RR¿QJ)LOWHULVEDVHGRQ
WKHRSHUDWLQJPRGH+RZHYHU\RXPD\RYHUULGHWKHDX-
WRPDWLFVHOHFWLRQLIEDQGFRQGLWLons warrant a different
XVXDOO\DWLJKWHUVHOHFWLRQ
[R.FLT] Button
TERMINOLOGY:
$³5RR¿QJ)LOWHU´DVLWVQDPHLPSOLHVSODFHVD³5RRI´
over the receiver IF system bandwidth. Starting at the
¿UVWPL[HUWKH5RR¿QJ¿OWHUSURWHFWVWKHFLUFXLWU\GRZQ-
VWUHDPIURPVWURQJVLJQDOVMXVWDVDURRIRQDKRXVH
protects the contents from rain and snow.
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Page 50 FT DX 1200 OPERATING MANUAL
IF NOISE BLANKER (NB) OPERATION
The FTDX1200LQFOXGHVDQHIIHFWLYH,)1RLVH%ODQNHUZKLFKFDQVLJQL¿FDQWO\UHGXFHQRLVHFDXVHGE\DXWRPRWLYHLJQL-
tion systems.
3UHVVWKH [NB]EXWWRQEULHÀ\ WRUHGXFH short dura-
tion pulse noise VXFK DV IURP VZLWFKLQJ WUDQVLHQWV
DXWRPRELOHLJQLWLRQVDQGSRZHUOLQHV7KH³NB ON´
ZLOODSSHDULQWKHGLVSOD\WRFRQ¿UPWKDWWKH1DUURZ
1%LVRSHUDWLQJ
3UHVVWKH[NB] button again to reduce longer-dura-
tion man-made pulse noise 7KH ³NBW ON´ ZLOO
DSSHDULQWKHGLVSOD\WRFRQ¿UPWKDWWKH:LGH1%LV
operating.
,I GHVLUHG \RX PD\ DGMXVW WKH 1RLVH %ODQNHU OHYHO
YLD 0HQX LWHP ³033 NB LEVEL´ WR WKH SRLQW ZKHUH
the offending noise is best reduced or eliminated.
See box below for details.
7RHQG1RLVH%ODQNHURSHUDWLRQSUHVVWKH[NB] but-
WRQ RQFH PRUH 7KH ³NB OFF´ ZLOO DSSHDU LQ WKH
GLVSOD\FRQ¿UPLQJWKDWWKH1RLVH%ODQNHULVQRORQ-
ger in operation.
ADVICE:
7KH1RLVH%ODQNHU OHYHOLVWKHVDPH IRUERWK9)2$
DQG9)2%
Adjusting the Noise Blanker Level
3UHVVWKH[MENU] EXWWRQWRHQJDJHWKH0HQX
mode.
5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKH
STEXWWRQWRVHOHFW0HQXLWHP³033 NB LEV-
EL´
3UHVVWKH[SELECT] button
5RWDWH WKH[VFO-B/CLAR]NQRERU SUHVVWKH
ST button) to the point where the offending
noise is best reduced or eliminated.
3UHVV WKH [SELECT]EXWWRQWKHQSUHVVWKH
[MENU] button to lock in the new setting and
exit to normal operation.
INTERFERENCE REJECTION
[NB] Button
[MENU] Button
[VFO-B/CLAR] Knob
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Page 51FT DX 1200 OPERATING MANUAL
INTERFERENCE REJECTION
CONTOUR CONTROL OPERATION
7KH&RQWRXU¿OWHUV\VWHPSURYLGHVDJHQWOHSHUWXUEDWLRQRIWKH,)¿OWHUSDVVEDQG7KH&RQWRXULVVHWWRHLWKHUVXSSUHVV
RUERRVWVSHFL¿FIUHTXHQF\FRPSRQHQWVDQGWKXVHQKDQFHVWKHVRXQGDQGUHDGDELOLW\RIDUHFHLYHGVLJQDO
3UHVVWKH [CONT/APF] button to activate the Con-
WRXU ¿OWHU 7KH '63 JUDSKLF GLVSOD\ ZLOO LOOXPLQDWH
DQGWKH FXUUHQW³QXOO´ RU³SHDN´ SRVLWLRQRI WKH
&RQWRXU¿OWHUZLOODSSHDULQWKH&217285LQGLFD
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:
$OWHUQDWHSUHVVHVRI WKH[CONT/APF] button will
VZLWFKWKH&RQWRXU¿OWHUEHWZHHQRQDQGRII
ADVICE:
7KH&RQWRXU¿OWHUOHYHOHLWKHUDQXOORUDSHDNPD\
EH DGMXVWHG XVLQJ 0HQX LWHP ³107 CONTOUR LEV-
EL´7KH IDFWRU\GHIDXOW VHWWLQJ LV IRUD QXOO RI±
G%
7KH EDQGZLGWK RYHU ZKLFK WKH &RQWRXU ¿OWHU HIIHFW
LVDSSOLHGPD\ EHDGMXVWHGXVLQJ 0HQXLWHP³108
CONTOUR WIDTH´7KHIDFWRU\GHIDXOWVHWWLQJLV
5HIHUWR)LJXUH³B´ WKLVLOOXVWUDWHVDQ³LQGHQ
WDWLRQ´RIWKH&RQWRXUILOWHULQWKHFHQWHURI
the passband. The Contour filter places a low-
4³QRWFK´ LQ WKHSDVVEDQGSHUWKHVHWWLQJVRI
0HQXLWHPV³107 CONTOUR LEVEL´ DQG ³108
CONTOUR WIDTH´UHIHUHQFHGDERYH&RXQWHU
FORFNZLVHURWDWLRQWRWKHOHIWRIWKH[CONT/
APF] knob causes the notch to move toware
D ORZHUIUHTXHQF\ZLWKLQWKHSDVVEDQGZKLOH
FORFNZLVHURWDWLRQWRWKHULJKWFDXVHVWKHQRWFK
WRPRYH WRZDUGD KLJKHUIUHTXHQF\ ZLWKLQWKH
passband. By removing interference or unwanted
IUHTXHQF\FRPSRQHQWVRIWKHLQFRPLQJVLJQDO
it is possible to make the desired signal rise out
RI WKH EDFNJURXQG QRLVHLQWHUIHUHQFH HQKDQFLQJ
intelligibility.
QUICK POINT:
%\MXGLFLRXVXVHRIWKH&RQWRXU¿OWHUWKH³VKRXOGHU´RIWKHSDVVEDQGUHVSRQVHPD\EHDOWHUHGRUFRPSRQHQWVPD\EH
UHPRYHGIURPZLWKLQWKHSDVVEDQGDOORZLQJWKHGHVLUHGVLJQDOWRULVHDERYHWKHEDFNJURXQGQRLVHDQGLQWHUIHUHQFHLQD
PDQQHUQRWREWDLQDEOHZLWKRWKHU¿OWHULQJV\VWHPV
[CONT/APF] Button
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
CONT/APF CONT/APF CONT/APF
[CONT/APF] Knob
A B C
CONTOUR INDICATOR
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Page 52 FT DX 1200 OPERATING MANUAL
IF BANDWIDTH
Desired Signal Desired Signal Desired Signal
QRMQRM
IF BANDWIDTH IF BANDWIDTH
SHIFT SHIFT SHIFT
INTERFERENCE REJECTION
IF SHIFT OPERATION (SSB/CW/RTTY/PKT/AM MODES)
,)6+,)7DOORZV\RXWRPRYHWKH'63¿OWHUSDVVEDQGKLJKHURUORZHUZLWKRXWFKDQJLQJWKHSLWFKRIWKHLQFRPLQJVLJ
QDODQGWKXVUHGXFHVRUHOLPLQDWHVLQWHUIHUHQFH%HFDXVHWKHFDUULHUWXQLQJIUHTXHQF\LVQRWYDULHGWKHUHLVQRQHHGWR
UHWXQHWKHRSHUDWLQJIUHTXHQF\WRHOLPLQDWHWKHLQWHUIHUHQFH7KHWRWDOSDVVEDQGWXQLQJUDQJHIRUWKH,)6+,)7V\VWHP
LVN+]
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]HGLQGHSHQGHQWO\ RQ HDFK9)2VWDFNRI9)2$ DQG
9)2%
5HIHUULQJWR)LJXUH³A´QRWHWKHGHSLFWLRQRIWKH
,)'63¿OWHUDVWKHWKLFNOLQHZLWKWKH[SHIFT]
NQRELQWKHR¶FORFNSRVLWLRQ,Q)LJXUH³B´DQ
interfering signal has appeared inside the original
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of rotating the [SHIFT] knob. The interference
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that the interference is outside of the passband.
[SHIFT] Knob
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SHIFT INDICATOR
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Page 53FT DX 1200 OPERATING MANUAL
A B C
INTERFERENCE REJECTION
WIDTH (IF DSP BANDWIDTH) TUNING (SSB/CW/RTTY/DATA MODES)
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5RWDWHWKH [WIDTH] knob to the left or right to re-
duce the interference.
ADVICE:
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the IF passband for 3 seconds whenever the [WIDTH]
knob is turned.
[WIDTH] Knob
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bandwidth on the SSB mode.
By rotating the [WIDTH]NQREWRWKHOHIW WKH
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rotation of the [WIDTH] NQRE WRWKHULJKW DV
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width.
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Using IF SHIFT and WIDTH Together
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interference has appeared both on the high
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ADVICE:
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SHIFT features are the primary tools you should
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additional signal-enhancement benefits on
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WIDTH INDICATOR
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
SHIFT SHIFT SHIFT Desired Signal Desired Signal Desired Signal
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