Yaesu FT DX 1200 Operation Manual

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Page 47FT DX 1200 O PERATING M ANUALμ-TUNE FILTER (R EQUIRES THE OPTIONAL RF μ TUNING KIT)The 5F Tuning .it provides ultra-sharp 5F selectivity for the front end of the transceiver. Very high Q is made pos-sible by the narrow-band design. Three 5F Tuning .its are available. The MTU-160 covers the 1.8 0H] band. TheMTU-80/40 covers the 3. and 7 0H] bands. The MTU-30/20 covers 10.1 and 14 0H] bands.When any or all) of the three optional units are connected, they will be automatically adjusted to center on your operat-ing freTuency.The narrow bandwidth is especially useful on the low bands, when many strong signals are being received via 1VISpropagation 1ear Vertical-Incidence Signals) within a narrow bandwidth. The added protection for the 5F stage is es-pecially helpful in preventing I0' and blocking.μ-Tune Operation1. 3ress and hold in the [MHz/μT] button for one sec-ond to activate the -Tune ¿lter. The “μ-Tune” willappear on the TFT display. The [VFO-B/CLAR]knob works as the -TU1I1G knob.A DVICE : The -Tune circuit will automatically align itselfto the operating freTuency. 5emember that -Tune only operates on the 140H] and lower bands.. 5otate the [VFO-B/CLAR] knob to peak the re-sponse background noise) or reduce interference.A DVICE : You may observe the relative peak point of the-Tune filter in the Tuning 2ffset Indicator onthe display, while tuning the [VFO-B/CLAR]knob. The amount of change in the center freTuencyof the -Tune filter, when rotating the [VFO-B/CLAR] knob, can be con¿gured using 0enuitem “046 uTUNE DIAL STEP”. If the ȝ-Tune filter has been manually adjustedaway from the center freTuency, you may pressthe [CLEAR] button to re-center the filter re-sponse on the current operating freTuency.3. 3ress and hold in the [MHz/μT] button for one sec-ond to disengage the -Tune ¿lterA DVICE :$lternate presses of the [MHz/μT] button will switchthe -Tune ¿lter between on or off.A DVICE : You may change the indication of the Tuning 2ffsetIndicator to display the -Tune filter continuouslywhile the -Tune filter is activated. This is 0enuitem “011 BAR DISPLAY SELECT”. See “Changingthe Tuning 2ffset Indicator” on the next page for de-tails of the setting. The -Tune ¿lters are the most advanced, selective5F preselector ¿lters ever incorporated into an $ma-teur 5adio transceiver. The 5F selectivity providedI NTERFERENCE R EJECTION[MHz/μT] Button[VFO-B/CLAR] Buttonby -Tune can be of tremendous value in ensur-ing Tuiet, intermod-free reception even in the mostcrowded bands on a contest weekend. The -Tune¿lters provide 5F selectivity on the order of a fewdo]en kH] at -6 dB, at the expense of a few dB ofsystem gain on bands where noise ¿gure is seldoman issue. You will notice that the S-meter deÀection,when -Tune is engaged, is slightly less than whenit is out of the circuit this is normal. If your antennasystem gain is so low that you cannot hear the bandnoise when -Tune is engaged highly unlikely), justswitch it out, to eliminate the slight insertion loss.TUNING OFFSET INDICATOR