Yaesu FT-950 User manual
FT-950
Yaesu again brings you innovation, quality, functions and features
that you will find nowhere else!
The FT-950 is the newest radio in the direct lineage of the FT DX 9000 and FT-2000 series radios.
It has been developed to fit the needs of both casual and serious DX enthusiasts
as well as new HF licensees eagerly seeking to discover the magic of the HF and 50 MHz bands.
Triple-conversion super-heterodyne receive architecture uses 69.450 MHz 1st IF,
with powerful 1st IF 3 kHz/6 kHz/15 kHz selectable roofing filters (MCF). You will enjoy
the advanced technology of the multi-function 30 kHz 32-bit Floating Point IF DSP.
Add the optional DMU-2000 Data Management Unit that provides an array of display capabilities,
and include the optional, ultra-sharp, fully-automatic, RF µ-Tuning Preselector System.
You may customize your FT-950 with the same great options that are available
with the FT DX 9000 and FT-2000 Series Transceivers!
The DXer's Choice : FT-950
HF/50MHz 100 W Transceiver
FT-950
High-speed Direct Digital Synthesizer (DDS) and High-spec Digital PLL
for Outstanding Local Oscillator Performance
Factory installed selectable 1st IF 3, 6, & 15 kHz Roofing Filters
Triple-Conversion Receiver Design using 69.450 MHz 1st IF
Ultra-strong Receiver Front End Includes 8 Bandpass Filters
Built-in TCXO for State-of-Art Stability (0.5 ppm @ room temperature)
Advanced Multi-function 30 kHz 32-bit Floating Point IF DSP
IF WIDTH, IF SHIFT, NOTCH, and CONTOUR Features
The 69.450 first IF stage features three roofing filters (15 kHz, 6 kHz, and
3kHz automatically selected by mode for best performance on today's
most crowded bands. Each roofing filter is a four-pole, fundamental-mode
monolithic crystal filter design to produce excellent shape factor.
Under busy band conditions, the roofing filters are positioned right after
the first mixer of the FT-950, and significantly improve the 3rd-Order
Intercept Point performance for all stages that follow.
While leaving the pitch of the incoming signal and bandwidth of the IF
passband unchanged, the IF Shift system allows you to vary the actual
passband higher or lower in frequency, eliminating interference that you
encounter outside the passband. You can also improve your reception by
choosing to narrow the bandwidth of the IF WIDTH function and then
varying the passband with the IF SHIFT by selecting these settings with
the SELECT dial. (The IF SHIFT control is concentric with the IF
WIDTH control. The variable IF WIDTH system has a default center
bandwidth of 2.4 kHz for SSB and CW, and 500 Hz for RTTY and PSK
operation. By simply rotating the IF WIDTH control counterclockwise,
the passband may be reduced to as little as 500 Hz (or 1.8 kHz on SSB .
If you like to listen in a wider bandwidth for greater fidelity on SSB, the
SSB bandwidth may be expanded to 3000 Hz to possibly improve the
audio-quality of the station you are working. And for improved AM
Broadcast reception, you may use the one-touch NAR function to toggle
between 9 kHz (wide and 6 kHz
(narrow , depending on interference,
for better audio. While the IF WIDTH
is generally used for setting the IF
DSP bandwidths, you may also utilize
the one-touch NAR (Narrow function
to reduce the passband further to your
pre-selected center bandwidth (SSB:
selections available from 200/400/600/
850/1100/1350/1500/1650/1800 Hz CW:
selections available from 100/200/ 300/
400/500 Hz, Factory preset default :
1800 Hz/SSB, 500 Hz/CW, 300 Hz/RTTY
and PSK .
The IF Digital Signal Processing system of the FT-950 is based on the TI
TMS320C6713 32-bit floating point DSP IC. Select the best DSP function
by simply rotating the SELECT dial located to the left side of the main dial.
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An ultra-low-noise local oscillator system that produces a very clean
first IF signal is essential to improve the strong-signal-handling
capabilities of the receiver section, in a multi-signal environment. The
spurious-free dynamic range and close-in blocking performance are
substantially enhanced with the high Carrier-to-Noise (C/N ratio of
the FT-950 high-speed digital PLL.
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The RF amplifier stage is designed for low and high intercept. Two
strong series-connected 2SC3356 bipolar transistors with negative
feedback assure consistent, repeatable performance. The low noise
figure and carefully controlled stage gains ensure that only the precise
amount of gain needed is actually utilized. The front panel "IPO"
switch lets you select direct feed to the first mixer (IPO , Preamp 1 (RF
AMP1 , or Preamp 2 (RF AMP2 which adds a second preamplifier
stage in series. Adapt the RF front end according to the antenna in use
and the noise and interference conditions present at the time.
IPO (Intercept Point Optimization allows you to set the total front-end
gain to optimize RF stage performance. The ultra-strong first mixer of
the FT-950 features SPM5001 FETs in an active, doubly-balanced
configuration optimized for a severe multi-signal environment. The
active design results in no net loss of gain in the mixer circuit itself,
thus eliminating the need for pre-amplification and permitting direct
feed of received signals to the first mixer.
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The triple-conversion design features a 1st IF of 69.45 MHz, a 2nd IF of
450 kHz, and a 3rd IF of 30 kHz (FM: 24 kHz . Each stage's advanced
filtering protects the stages that follow from unwanted signal voltage, creating
a quiet, robust receiver with unmatched total system performance.
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High-performance Receiver Design inherited from the proud lineage of the FT DX 9000/FT-2000 Series radios
The legendary Yaesu 32-bit floating point IF DSP - legendary known and reputed among the serious DXers
and enthusiasts - will give you the edge over all other DSP-based radios
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The incredibly sharp "brick wall" filters of the IF DSP system can reveal
characteristics of incoming signals that you have never heard before,
and not all of them are really pleasant to listen to all the time Using
the
CONTOUR control, you can roll off low-frequency or high-frequency
components to shape the receiver passband differently, or null out part
of the mid-range area With continuous adjustment throughout the
passband, you may null out interfering or irrelevant frequency components
The desired frequency components will significantly rise out of the
background noise, improving fidelity and signal-to-noise (S/N) ratio
For reduction of random noise types, the FT-950 utilizes a powerful
Digital Noise Reduction filter, that contains fifteen different noise
analysis parameters specially created after thousands of hours of on-
the-air testing You may choose any of these parameters to effectively
reduce most noise under nearly any given conditions
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The YAESU DSP digital modulation technique not only provides an
analog-sounding high-quality digital SSB modulation envelope, but
also allows the transmission bandwidth to be adjusted by the operator
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Selecting the NOTCH function with the SELECT dial will enable the
FT-950's very high "Q" IF Notch Filter, producing a deep notching effect
typically in excess of 70 dB Using the Menu mode to choose the "digital"
NOTCH function, a uniquely designed DSP Auto Notch (DNF) filter
can also be engaged Independently from the "manual" Notch function,
the Auto Notch (DNF) can reduce multiple carriers within the passband
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The Secret of superior performance of the FT DX 9000/FT-2000 Series
on the lower bands is the RF µ-Tuning system This same system is now
available as an option for the FT-950!
On the lower Amateur bands, the signal voltages impinging on a receiver
can create noise and intermodulation effects that can cover up weak
signals you're trying to pull through Three modules (MTU-160, MTU-
80/40, and MTU-30/20) are available Ð these modules may be connected
externally with no internal modification required!
The RF µ-Tuning filters utilize a stack of large 1 1" (28 mm) Ni-Zn
Ferrite cores, driven through a silver-plated coil assembly by a precision
stepper motor The resulting high Q (typically over 300) provides a very
steep resonance peak near your operating frequency (On the 160 m
band, typically -3 dB@±12 kHz, -30 dB@±450 kHz ) And the 3rd order
Intercept Point (IP3) is increased by 4 dB with the RF µ-Tuning system
The ferrite cores utilized in the µ-Tune filters are driven by a high-
resolution, high torque stepper motor (4-phase unipolar motor/2-phase
magnetization system) with angular resolution of 1 8deg, and the
synchro belt drive has an estimated lifetime of more than 10,000 hours
of actual operation For 160-meter operation, the ferrite core diameter is
2 2" (55 mm)! The RF µ-Tune system tracks your operating frequency,
although you can manually skew the frequency response when special
interference conditions require it
If you turn the RF µ-Tune system off when leaving your frequency or
QSYing to other bands, the RF µ-Tune system will be re-centering the
µ-Tune filter on your current operating frequency when the µ-Tune is
re-engaged
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The Secret of the FT DX 9000/FT-2000/FT-950 on the lower bands
RF µ-Tuning Ultra Sharp Preselector System (option)
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