Yaesu FT-991 Features

The Yaesu FT-991 Transceiver is capable of operating SSB, CW, AM, FM, Packet and System Fusion C4FMDigital. The legendary tradition of Yaesu design is a legacy of excellence established decades ago, providing quality, stability and durability.

The Yaesu FT-991 is designed for the most competitive operating situations, with a suite of new features to’enhance the experience. Whether you primarily operate at home, mobile or in the field, the FT-991 will provide outstanding fundamental performance and an inviting expansion into a full featured base station.

^{Radio Features;}

• ^{160 Meters through 70 Centimeters – SSB/CW/FM/C4FM Digital/AM/RTTY/PSK}
• ^{100 Watts (2 Meter / 70 Centimeter: 50 Watts) of Solid Performance}
• ^{3.5 inch TFT Full-Color Touch Panel Operation for Superior Operability and Visibility}
• ^{High Speed Spectrum Scope with ASC (Automatic Spectrum-Scope Control) built-in}
• ^{Roofing Filter 3 kHz and 15 kHz}
• ^{High Accuracy TCXO ±0.5 ppm and high resolution DDS and PLL local oscillator}
• ^{32-bit High Speed Floating Point IF DSP}
• ^{IF WIDTH and IF SHIFT provides great QRM Rejection}
• ^{CONTOUR, DNR, IF Notch and APF (Audio Peak Filter, CW only)} 

• 160 - Meters High Speed Automatic Antenna Tuner included 

Yaesu FT-991 Two Tone Test

The following images depict the results of a two tone test I ran on the repaired FT-991.  The rear data port was used to inject the signal from a PC running SpectrumLab. Tones where set to 1000Hz and 1575Hz respectively. The RF out of the Yaesu FT-991 was fed into the SM-220.
This image shows the transmitter flat topping, settings where 100W and ALC  increased slightly to peak RF output (a few bars visible).  The maximum output power achieved and observed on the external power meter was 90W (10% accuracy at full scale). Flat topping is a symptom of the PA being over-driven.

With reduced ALC, i.e. no visible ALC indication in fact one step (click) below zero observable ALC and with the FT-991 set to 100W, the following output was observed.

Yaesu FT-991 Programming the Memory Channels

Yaesu FT-991 - Programming the Memory Channels
Talks us through how to program and access the user memory channels of the Yaesu FT-991 transceiver.

Yaesu-FT-991 Memory Recall

[Yaesu-FT-991] Memory Recall

I'm sure I'm missing something in the manual. I have programmed some memories with no problem. When I try to recall a memory, I hit the MCH softkey and nothing happens when I turn the multi knob. I can see the list of memory channels, but I can't recall one. Otherwise, I'm really enjoying my new FT991.

When I have the normal Frequency and S-Meter up on the FT-991 TFT screen, I just hit the V/M button and the rig goes the the last memory channel I last used. Then just use the MULTI knob to scroll through the memory channels. 

Press the M/V button to be in memory mode, MEM ## in upper left of touch screen. Touch the MCH touch key. Rotate the Multi knob and memories will scroll thru the frequency window, MEM # changing.
You cannot recall memories when screen shows the Grey memory list.

To recall memories you press the V/M button. To change from memory channel to memory channel, you press the MCH Icon on the screen, then rotate the MULTI knob.

Yaesu FT-991 - Programming the Memory Channels

Yaesu FT-991 - Programming the Memory Channels