Yaesu RF UTUNING KIT OPERATING MANUAL

RF μTUNING KIT OPERATING MANUAL

Congratulations on your purchase of the YAESU RF μTUNING KIT. This operating manual will help you discover the full capability of the RF ƒÊTUNING KIT. Please read this manual before beginning installation of the Kit.

NOTICE

 Do not modify or change the μTUNE UNIT  Be Carefully to avoid miss-connections  3 Do not place the μTUNE UNIT on an unstable loca-

tion and where objects will fall onto it from above

 Ensure adequate ventilation around the RF μTUNING

KIT

 Do not stretch or pinch the cables

INTERCONNECTIONS

(

PLEASE TURN OFF THE TRANSCEIVER BEFORE CONNECTING CABLES

SINGLE CONNECTION

ANT

GND

µ-TUNE TO

µ-TUNE

FROM

RF Cable (Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF CABLE

の付属品

RF Cable (Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF CABLE

~AC IN

µ-TUNE

CNTL Cable (Supplied with RF μTUNING KIT)

CNTL CABLE

(RF µTuning Kit )

の付属品

RF IN

の付属品

 6 Do not apply any incorrect voltage to the μTUNE

UNIT

 Do not install this apparatus in a location with exposure

to direct sunshine

 Keep this equipment out of the reach of small children  Do not wipe the case with chemicals such as thinner or

benzene

ADVICE

 The RF connecting cables are color coded

(black and gray) to assist in properly connecting the RF IN and RF OUT jacks. (see illustration)

 Miss-connection will not damage the RF

μTUNING KIT. However, improper operation

CNTL IN

may occur.

 Connect the color-coded control cable(s) be-

tween the CNTL OUT and CNTL IN jacks (see illustration). Confirm all connections before

RF OUT

turning on the transceiver.

 If the FT-2000 does not operate and the fre-

quency display blinks sometimes, confirm and correct the “CNTL IN” and “CNTL OUT” connections.

 The order of connecting multiple RF μTUN-

ING KITS is not important.

)

No portion of this manual may be reproduced without the permission of VERTEX STANDARD CO., LTD.

Printed in Japan

EAE97X720

MULTI CONNECTION

GND

µ-TUNE

FROM

µ-TUNE TO

RF Cable (Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF CABLE

RF Cable (Supplied with RF TUNING KIT)

ANT

の付属品

~AC IN

µ-TUNE

CNTL Cable (Supplied with RF μTUNING KIT)

CNTL CABLE

(RF µTun ing Kit )

RF Cable (Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF CABLE

RF IN

の付属品

CNTL IN

CNTL OU T

RF OUT

RF Cable

(Supplied with RF μTUNING KIT)

CNTL Cable

CNTL CABLE

(Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF IN

の付属品

CNTL IN

CNTL OU T

RF OUT

RF Cable

(Supplied with RF μTUNING KIT)

CNTL Cable

CNTL CABLE

(Supplied with RF μTUNING KIT)

(RF µTuning Kit )

RF IN

の付属品

CNTL IN

RF OUT

The RF μTUNING KIT provides ultra-sharp RF selectivity for the front end of the transceiver. Very high Q is made possible by the narrow-band design. Three RF μTUNING KITS are available. The MTU-160 covers the 1.8 MHz band. The MTU-80/40 covers the 3.5 and 7 MHz bands. The MTU-30/20 covers 10.1 and 14 MHz bands.

When any (or all) of the three optional units are installed, they will be automatically adjusted to center on your operating frequency.

The narrow bandwidth is especially useful on the low bands, when many strong signals are being received via NVIS propagation (Near Vertical-Incidence Signals) within a narrow bandwidth. The added protection for the RF stage is especially helpful in preventing IMD and blocking.

The RF μTUNING KIT, provides a Q and shape factor much higher than that afforded even by VRF. It can also be manually adjusted to provide relief from interference as close as 10 kHz away. The insertion loss of the RF μTUNING KIT is higher than that of the VRF circuit, so if Noise Figure is a concern you may select the VRF circuit, instead of RF μTUNING KIT, via the Menu of the FT-2000 transceiver.

1. Press the [VRF] button momentarily. The “

” icon will appear at

“VRF” icon

Tuning Offset Indicator

[

VRF] button

the FLT column of the Receiver Configuration Indicator on the FT2000 display, and the μ-Tune circuit will be engaged.  The μ-Tune circuit will

automatically align itself to your operating frequency.

µ-Tune Filter is activated

 The VRF circuit will engage when you choose an amateur band

[

which is not connected to a μ-TUNE UNIT.

Main Tuning Dial knob

VRF] knob

2. Now rotate the [VRF] knob to peak the response (background noise) or reduce interference.  You may observe the relative peak point

Top Band Edge

of the μ-Tune filter in the Tuning Offset Indicator on the display while tuning the [

VRF] knob.

Bottom Band Edge

 The amount of change in the center fre-

quency of the μ-Tune filter, when rotating the [VRF] knob by one click, can be configured using Menu

035 GEnE μT DIAL035 GEnE μT DIAL

item “

035 GEnE μT DIAL.”

035 GEnE μT DIAL035 GEnE μT DIAL

3. Press the [VRF] button (momentarily) once more to disengage the μ- Tune filter. The “ ” icon will turn on in place of “ ” icon. In this mode, only the fixed bandpass filter for the current band will be engaged.

QUICK NOTE

The permeability-tuning concept utilized in the μ-Tune circuit dates back many decades, as it was incorporated in such classic transceivers as the FT-101 and FT-901 series, in addition to the FTDX 401 and similar models. The μ-Tune circuit in this RF μTUNING KIT is the highest development of this circuit concept ever employed in an Amateur transceiver, and is adopted in our highest-grade transceiver FT DX 9000 series.

OPERATION

µ-TUNE AND VRF: COMPARISONS TO FIXED BANDPASS FILTERS

µ-Tune

Inspection of the illustrations to the right will demonstrate the profound advantage of the μ-Tune circuit. In illustration [A], the gray area represents the passband of a typical fixed bandpass filter covering the 1.8 ~ 3 MHz range; this is typical of the kind of bandpass filter found in many high-quality HF receivers today. Note also the hypothetical distribution of signals across the 160-meter band. In illustration [B], note the narrow white segment within the gray passband of the fixed BPF. These narrow segments represent the typical bandwidth of the μ-Tune filter, and one can see that the passband has been reduced from about 750 kHz in the case of the fixed BPF) to a few dozen kHz when μ-Tune is engaged. The vast majority of the incoming signals are outside the passband of the high-Q μ-Tune filter, and they will not impinge on any of the RF/IF amplifiers, the mixers, or the DSP. Very strong out-of-band signals like this can cause Intermodulation, blocking, and an elevated noise floor for a receiver.

VRF

In this example, illustration [a] depicts a typical fixed bandpass filter covering 14.5 to 22 MHz, and once again the gray shaded area depicts the fixed bandpass filter’s frequency coverage. The vertical lines in the illustration represent hypothetical signals throughout this frequency range. Figure [b] shows the same fixed BPF, with the white area representing the typical passband of the VRF filter operating in the same frequency range. Although the selectivity of the VRF is not as tight as that of the μ-Tune filter, the RF selectivity of the VRF preselector is still magnitudes better than that of the usual fixed bandpass filter, affording significant protection against the ingress of high signal voltage from strong out-of-band signals.

1.8MHz 2.5MHz

FRONT-END BAND WIDTH

1.8MHz 2.5MHz

TUNE BAND WIDTH

14.5MHz 22MHz

FRONT-END BAND WIDTH

14.5MHz 22MHzVRF BAND WIDTH

ADVICE

 The μ-Tune filters are the most advanced, selective RF preselector filters ever incorporated into an Amateur Radio transceiver. The

RF selectivity provided by μ-Tune can be of tremendous value in ensuring quiet, intermod-free reception even in the most crowded bands on a contest weekend. The μ-Tune filters provide RF selectivity on the order of a few dozen kHz at -6 dB, at the expense of a few dB of system gain on bands where noise figure is seldom an issue. You will notice that the S-meter deflection, when μ-Tune is engaged, is slightly less than when it is out of the circuit. This is normal. If your antenna system gain is so low that it is impossible to hear band noise when μ-Tune is engaged (highly unlikely), just switch it out or revert to the VRF system, which has slightly less insertion loss.

 As you tune around on an amateur band with μ-Tune engaged, the microprocessor automatically commands the stepper motor to

drive the toroid core stack and center the filter on your current operating frequency (the tuning resolution is 5 kHz). You may, however, use the [VRF] knob to skew the filter response to one side or the other of your operating frequency, to deal with heavy interference on either side. To re-center the μ-Tune filter on the operating frequency, and eliminate any offset, press and hold in the [

VRF] switch for two seconds.

 You can use the μ-Tune circuit on the Sub Band Receiver (VFO-B). However, in this case, the stepper motor does not drive the

toroid core to center the filter on your operating frequency. You must adjust the peak response (background noise) or reduce interference by rotating the [VRF] knob.

 You may always observe the peak point of the μ-Tune filter in the Tuning Offset Indicator on the display via Menu item “

BAR SELBAR SEL

BAR SEL.”

BAR SELBAR SEL

 While μ-Tune is a superior RF preselection circuit, it may be disabled via the Menu on the FT-2000; if this is done, the VRF circuit

will engage when the [VRF] button is pressed. To disable μ-Tune, enter the Menu item “

035 GEnE μT DIAL035 GEnE μT DIAL

035 GEnE μT DIAL” of the FT-2000 then

035 GEnE μT DIAL035 GEnE μT DIAL

set the selection to “OFF.”

010 diSP010 diSP

010 diSP

010 diSP010 diSP

ADVICE

With μ-Tuning, the center frequency of the filter is continuously adjustable throughout its operating range. The quality L/C components ensure high Q of the circuit and a tight passband. The RF preselection design task required the selection of quality L/C components, but the crafting of a tuning mechanism and tuning concept that preserves system Q while providing consistent smooth automated tuning over a wide operating frequency range. The smooth tuning is achieved by varying the inductance over a wide range; this is accomplished by motor-driving a large 1.1” (28 mm) ferrite core stack through a 2” high (50 mm) coil structure. The Q of the μ-Tune circuit is over 300, and yields unmatched RF selectivity for outstanding rejection of undesired signals.

ア

アンテナ

Antenna

1 2

ンテナセレクター

Antenna Selector

VRF

THRU

SPECIFICATIONS

Case Size (WxHxD): Weight (Approx.): 5.7 lbs (2.6 kg

4.7” x 5” x 12.9” (

バンドパスフィルター

Bandpass Filter

45-60 MHz

20.9-30.1 MHz

13.9-20.9 MHz

9.9-13.9 MHz

6.9-9.9 MHz

4.7-6.9 MHz

3.4-4.7 MHz

1.7-2.5 MHz

120 x 127 x 328 mm

)