Check out this video to learn more.
Yaesu FT-991(A) Users Group (groups.io)
https://groups.io/g/Yaesu-FT-991
Yaesu FT-991(A) Users Group (groups.io)
https://groups.io/g/Yaesu-FT-991
Showing posts with label Yaesu 991 Problems. Show all posts
Showing posts with label Yaesu 991 Problems. Show all posts
Yaesu FT-991a Review Overview Demonstration HF/VHF/UHF/C4FM
FT-991 The Final Analysis
The final analysis of the ill-fated FT-991. But wait, is there a golden lining? Can you turn their mistake into a benefit for you?
Yaesu FT-991(A) Users Group (groups.io)
https://groups.io/g/Yaesu-FT-991
FT-991 The Final Analysis
Yaesu FT-991(A) Users Group (groups.io)
https://groups.io/g/Yaesu-FT-991
FT-991 The Final Analysis
Yaesu FT-991 vs FT-991A why buy
I am wondering if the FT-991A is worth the extra 600.00 over the FT-991. I believe that there were some quality issues with the FT-991, but Yaesu corrected the issues with units manufactured in 2016.
I am open to other radios that are similar. I want 160-10 HF, UHF/VHF. and 6 meters including FM.
I believe Yaesu is the only one that has the complete package in the price range of $1500 and under.
I am open to other radios that are similar. I want 160-10 HF, UHF/VHF. and 6 meters including FM.
I believe Yaesu is the only one that has the complete package in the price range of $1500 and under.
FT-991 Weak HF Receive - Receiver fault
Bugger me, the dam think blew again, I was in the WPX contect with my FTdx3000 with the amp and the FT-991A was on 40m. I noticed that in IPO mode on the 991A nothing heard. Lucky I had bought 50 of those little 150 ohm surface mount resistors.
Pulled the bottom off the 991A and found R1005 just next to RL1001. The resistor had broken in two and the cct board was burnt where is sits. Its not worth trying to solder the bloody thing in there as its too small. I tacked a small piece of wire onto the relay pad where one side of the 150 ohm resistor connects and a small piece of wire onto the terminal of J1001. The ends of these two wires sat above the board a little and I soldered one side of the new 150 ohm resistor to one wire, bent the other wire over to touch the other side of the resistor and soldered it.
Pulled the bottom off the 991A and found R1005 just next to RL1001. The resistor had broken in two and the cct board was burnt where is sits. Its not worth trying to solder the bloody thing in there as its too small. I tacked a small piece of wire onto the relay pad where one side of the 150 ohm resistor connects and a small piece of wire onto the terminal of J1001. The ends of these two wires sat above the board a little and I soldered one side of the new 150 ohm resistor to one wire, bent the other wire over to touch the other side of the resistor and soldered it.
FT-991 Weak HF Receive
I seem to have a big drop in sensitivity on all HF bands. It has been a superb receiver for the past year. Transmit is normal.
On a strong signal with ATT off and IPO the S- meter is at 0. The spectrum display is near the bottom line. The same signal with ATT off and AMP1 is S9+5dB and the spectrum display is above the first bar. With ATT off and AMP2 the S-meter reads about S9+15dB and the spectrum display is on the second (middle) line. The difference between IPO and AMP1 is an almost inaudible signal to S9+.
A signal that is S-9 on my FT-897D (with that rigs ATT and IPO both off) is barely S9 on the FT-991 with ATT off and AMP2 on and at S0 with no amps (IPO). With the amps off it is S zero. VHF/UHF is normal. Looks like I have a receiver problem.
Back to Yaesu for repair???
On a strong signal with ATT off and IPO the S- meter is at 0. The spectrum display is near the bottom line. The same signal with ATT off and AMP1 is S9+5dB and the spectrum display is above the first bar. With ATT off and AMP2 the S-meter reads about S9+15dB and the spectrum display is on the second (middle) line. The difference between IPO and AMP1 is an almost inaudible signal to S9+.
A signal that is S-9 on my FT-897D (with that rigs ATT and IPO both off) is barely S9 on the FT-991 with ATT off and AMP2 on and at S0 with no amps (IPO). With the amps off it is S zero. VHF/UHF is normal. Looks like I have a receiver problem.
Back to Yaesu for repair???
Yaesu FT-991a Review Overview Demonstration HF/VHF/UHF/C4FM
Yaesu FT-991a Review Overview Demonstration HF/VHF/UHF/C4FM
Yaesu FT-991 AM Issue Resolution
Yaesu FT-991 AM Issue Resolution
Glenn/WA3LAB found the fix below on the net to resolve the issue with the Yaesu FT-991 in AM mode. The techs at Yaesu they said they’re aware of it, but Yaesu has not put out a bulletin on it.
Both Glenn & I have followed this procedure and it appears to work. I wouldn’t want it put out there without letting people know that they should proceed with care, and not to change anything else unless they really know what they’re doing. Since there’s not many people running AM anymore most people have no idea there’s a problem.
(Warning: once you put the radio into the service mode you can really screw things up, so do this at your own risk.)
Glenn/WA3LAB found the fix below on the net to resolve the issue with the Yaesu FT-991 in AM mode. The techs at Yaesu they said they’re aware of it, but Yaesu has not put out a bulletin on it.
Both Glenn & I have followed this procedure and it appears to work. I wouldn’t want it put out there without letting people know that they should proceed with care, and not to change anything else unless they really know what they’re doing. Since there’s not many people running AM anymore most people have no idea there’s a problem.
(Warning: once you put the radio into the service mode you can really screw things up, so do this at your own risk.)
USB Cable to the YAESU FT-991
When I plug in my USB Cable to the FT-991, the radio powers off
Cause/Symptom:
Radio powers off when USB cable is plugged in.
Solution:
Check your Power supply ground, The ring on the power supply ground post terminal may have come out or has gotten loose. It is getting ground from the USB connection which can cause radio failure.
Cause/Symptom:
Radio powers off when USB cable is plugged in.
Solution:
Check your Power supply ground, The ring on the power supply ground post terminal may have come out or has gotten loose. It is getting ground from the USB connection which can cause radio failure.
YAESU FT991 MARS modification
I did the MARS modification but the 6m, 2m & 70cm frequencies are not expanded
Cause/Symptom:
I did the MARS mod but the 6m, 2m & 70cm frequencies are not expanded.
Solution:
The MARS mod only opens the HF 160-10m bands.
Cause/Symptom:
I did the MARS mod but the 6m, 2m & 70cm frequencies are not expanded.
Solution:
The MARS mod only opens the HF 160-10m bands.
My FT-991 does not stop scanning
My FT-991 does not stop for 5 seconds when scanning
Cause/Symptom:
My FT-991 does not stop for 5 seconds when scanning
Solution:
The FT-991 does stop on the received signal when scanning, but you must first adjust the squelch to level 9.
There are 2 settings for scan, one is TIME and the other is PAUSE. If the radio is set for TIME, the FT-991 will stop on the received signal for 5 seconds and then resume scanning even if the signal is still present. If set for PAUSE, the FT-991 will stop and remain on the signal until it is no longer present.
Cause/Symptom:
My FT-991 does not stop for 5 seconds when scanning
Solution:
The FT-991 does stop on the received signal when scanning, but you must first adjust the squelch to level 9.
There are 2 settings for scan, one is TIME and the other is PAUSE. If the radio is set for TIME, the FT-991 will stop on the received signal for 5 seconds and then resume scanning even if the signal is still present. If set for PAUSE, the FT-991 will stop and remain on the signal until it is no longer present.
Setup Wires-x and YAESU FT-991 with HRI-200
Setup Wires-x and YAESU FT-991 with HRI-200
It is possible to connect to another node via RF but it will depend on your antenna, the other stations antenna, power out, distance, etc. Plus some nodes are not on the air 24/7.
The best way to use Wires-x is to buy another rig as a node rig, like the FTM-100d and a HRI-200, then connect to it using your FT-991 in wires-x mode, doing this you will be connected via the internet to the the Wires-x system and then you can connect to any active node anywhere. If you use C4FM rigs you can do this digital which gives you more functions and better audio.
The best way to use Wires-x is to buy another rig as a node rig, like the FTM-100d and a HRI-200, then connect to it using your FT-991 in wires-x mode, doing this you will be connected via the internet to the the Wires-x system and then you can connect to any active node anywhere. If you use C4FM rigs you can do this digital which gives you more functions and better audio.
Tech Video - FT-991 Digital Modes
Tech Video - FT-991 Digital Modes
http://www.youtube.com/watch?v=xPCwFNc3gyQ&sns=em
FT-991 Software Update and Version Identification
The latest versions are listed below with the release dates.
MAIN Software Version 02-02 (07/24/15)
DSP Software Version 01-04 (07/24/15)
TFT Software Version 02-01 (07/24/15)
*If you already have MAIN: Ver. 02-02, DSP: Ver. 01-04 and TFT: Ver. 02-01 software versions, it is not necessary to update the FT-991 again.
There are four different Software installations. Each one must be followed carefully. Installing the wrong type software may cause difficulties. Check your radio before installing software to be sure which updates are needed. Please read the FT-991 Firmware Upgrade Manual before proceeding.
If multiple software installations are required the MAIN software should be installed first, as it is the only one that requires a press and hold in the [F(M-LIST)] key while turning the radio back on. This resets the radio and locks in the new software.
Before installing new firmware, please verify your current version firmware with the following procedure:
MAIN Software Version 02-02 (07/24/15)
DSP Software Version 01-04 (07/24/15)
TFT Software Version 02-01 (07/24/15)
*If you already have MAIN: Ver. 02-02, DSP: Ver. 01-04 and TFT: Ver. 02-01 software versions, it is not necessary to update the FT-991 again.
There are four different Software installations. Each one must be followed carefully. Installing the wrong type software may cause difficulties. Check your radio before installing software to be sure which updates are needed. Please read the FT-991 Firmware Upgrade Manual before proceeding.
If multiple software installations are required the MAIN software should be installed first, as it is the only one that requires a press and hold in the [F(M-LIST)] key while turning the radio back on. This resets the radio and locks in the new software.
Before installing new firmware, please verify your current version firmware with the following procedure:
FT-991 Software Update and Version Identification
Yaesu FT-991 - SSB AM CW receiving around
Yaesu FT-991 - SSB AM CW receiving around
The new Yaesu FT-991 receiving in SSB, CW an AM, around on the band. AM reception is always done with a HF Yagi.
The new Yaesu FT-991 receiving in SSB, CW an AM, around on the band. AM reception is always done with a HF Yagi.
Yaesu FT-991 and Yaesu FTdx3000 side by side DNR test
Yaesu FT-991 and Yaesu FTdx3000 side by side DNR test
Test et comparaison du DNR entre le FT-991 et le FTdx3000
Test et comparaison du DNR entre le FT-991 et le FTdx3000
Yaesu FT-991 Unboxing
FT-991 100W HF/50 MHz, 50W VHF/UHF Compact Base Station Transceiver.
This New Generation All-Mode Transceiver is capable of operating SSB, CW, AM, FM, Packet and System Fusion C4FM Digital. The 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 plus give you easy access to the full range of exciting modes available on the ham bands today.
The FT-991 provides solid transmitter performance with up to 100 Watts on HF/50MHz and 50 Watts on 144/430 MHz. Recognizing an all-important Amateur Radio Golden Rule - “You cannot work them if you cannot hear them”– the FT 991 features a rugged state-of-the-art highly balanced receiver circuit configuration. The highspeed floating point DSP chip TMS320C6746 (3000 MIPS / 2250 MFLOPS) from Texas Instruments used in the receiver design guarantees excellent interference rejection with actual signals under real-world conditions, not only on HF but also in the VHF and UHF bands.
The 1st IF frequency is protected by selectable robust 3 kHz and 15 kHz roofing filters that effectively attenuate interfering signals. The triple conversion circuit structure allows highly flexible gain distribution at each stage. This proven receive design architecture enables elimination of unwanted signals through filters at each stage as well as optimized gain distribution.
A built-in 3.5-in TFT full color touch screen high resolution display with loads of information provides stress-free operability and visibility for the FT-991 user. Advanced Spectrum Scope with ASC (Automatic Spectrum-Scope Control) located just below the LCD display gives the operator all the information for comfortable QSO on the DXing scene.
The new FT-991 also has Automatic Mode Select (AMS) function that instantly recognizes digital mode or FM analog mode and enables mutual communication.
This New Generation All-Mode Transceiver is capable of operating SSB, CW, AM, FM, Packet and System Fusion C4FM Digital. The 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 plus give you easy access to the full range of exciting modes available on the ham bands today.
The FT-991 provides solid transmitter performance with up to 100 Watts on HF/50MHz and 50 Watts on 144/430 MHz. Recognizing an all-important Amateur Radio Golden Rule - “You cannot work them if you cannot hear them”– the FT 991 features a rugged state-of-the-art highly balanced receiver circuit configuration. The highspeed floating point DSP chip TMS320C6746 (3000 MIPS / 2250 MFLOPS) from Texas Instruments used in the receiver design guarantees excellent interference rejection with actual signals under real-world conditions, not only on HF but also in the VHF and UHF bands.
The 1st IF frequency is protected by selectable robust 3 kHz and 15 kHz roofing filters that effectively attenuate interfering signals. The triple conversion circuit structure allows highly flexible gain distribution at each stage. This proven receive design architecture enables elimination of unwanted signals through filters at each stage as well as optimized gain distribution.
A built-in 3.5-in TFT full color touch screen high resolution display with loads of information provides stress-free operability and visibility for the FT-991 user. Advanced Spectrum Scope with ASC (Automatic Spectrum-Scope Control) located just below the LCD display gives the operator all the information for comfortable QSO on the DXing scene.
The new FT-991 also has Automatic Mode Select (AMS) function that instantly recognizes digital mode or FM analog mode and enables mutual communication.
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