Yaesu-FT-991-group database

Yaesu-FT-991-group database

The serial numbers being forwarded. From what normally occurs is the failure transceiver 'group' usually will coincide with a production run of a specific device's supplier of the failing component or components ..... That is why I am interested in the specific FT991 serials - to see if this is occurring . As we all should know is that sometimes a failed RF output fet / transistor can effect a rig's overall failure ( i.e - from just no RF output to a absolutely 'dead' rig due to a blown circuit trace from a transistor's shorting out ) Anyway , thanks again for taking the time to send out the serial numbers ! 

The list of serial numbers I have is:
Serial No.   S/N:

4M020150 Nov 2014
4MN020430 Nov 2014
4N020473 Dec 2014
4N020461 Dec 2014
5E50011 Mar 2015
5C030022 Jan 2015
5C030067 Jan 2015
5C021122 Jan 2015
5C030021 Jan 2015
5D030216 Feb 2015

5E050178 Mar 2015

5F070468 Apr 2015
5F070389 Jun 2015
5G080451 July 2015
5G080467 JUL 2015
5G080506 JUL 2015

5I150370 July 2015

There have been thousands of FT991's sold, so the chance of getting a bad one would seem to be very small. Of course as usual the people with good rigs are quietly happy (like me) and the the people with dead rigs quite rightly complain, so that's what we hear. It doesn't necessarily mean the FT991 is any worse than any other model or brand.

DATABASE....
Yaesu FT-991 frequency of failures

Yaesu FT-991(A) Users Group (groups.io)
https://groups.io/g/Yaesu-FT-991

Yaesu FT-991 Final Stage

For background information please refer to my previous posts and the comments received on the FT-991 ALC problem and HF PA issue.

The following procedure for setting the Yaesu FT-991 final stage idling current has not been verified against Yaesu’s technical supplement for the FT-991.  Use this procedure at your own risk.

Having noticed that the idling current measured on the working FT-991 was circa 2.5A and studying the FT-450 technical supplement for similarities (thanks to Dave Bird G6JED for that pointer), I noted that the FT-450 technical supplement specifies 1A (+/- 100ma) for each RD100HFF1.  If you set the FT-991’s idling current accordingly, max RF output is on the low side circa (90W) on 20m USB.  My conclusion from testing is that the idling current for each of the RD100HFFI’s should be circa 1.25A to achieve full output or at least it gets the radio to the total idle current of 2.5A originally set by Yaesu.  While I initially opted to set the idling current to 2.5A, but have subsequently decided to revisit that decision and have chosen to set each RD100HFF1 for 1A giving a total idling current of 2A.

Alignment Procedure Yaesu FT-991 Final Stage Idling Current

The following procedure assumes the top covers of the Yaesu FT-991 have been removed. Click on the image to enlarge to view test and adjustment points.

1. Ensure a dummy load is connected to the HF antenna

[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] Power Used on Standby | Receive

Does anyone know how much power the FT991 uses on standby or in receive mode.

Or more specifically how would it work running off of a battery if I dial the power down to 5 or 10 watts.

Ham Radio Deluxe – Yaesu FT-991 settings

Ham Radio Deluxe – Yaesu FT-991 settings

Anyone using HRD with your FT-991?

When I go to new set up under Yaesu they do not have FT-991,  so what does use, or is there an update for this program?

The newer versions have it. I'm using 6.3.0.429 which has it. It does not have all the menu options or C4FM as a mode however.

just want to let you folks know that the FT-991 does not require any interface devices to work digital modes.
The built in USB port combined with the Yeasu USB port drivers works directly with your PC.

You must install the Yeasu USB drivers first.
Connect the USB cable and 2 com ports are created
Select the enhanced com port for the Cat Control

There will be on new USB Audio Codec installed - this provides the mic input and speaker output for the Digital modes.

In HRD software. (thanks to Chuck Martin, ko1i )

Use 38400, 8,2,N and for flow control I have RTS enabled (default) on the FT-991 menu and I checked the box for RTS on the HRD setup screen (it did not work until I set up the correct RTS mode).

Yaesu FT-991 settings Property of COM-port
- Use the Enhanced COM Port

FT-991 Menu;
Menu
- 031 CAT RATE – 38400bp

Yaesu FT-991 inputting the Manual Call Sign

Yaesu FT-991 Operating Manual (Page 11 of 155)

When turning on the power for the first time after purchase, or after resetting the transceiver, enter your own call sign.

The call sign will be displayed on the start screen when turning on the power and will be used to identify the station when sending messages during digital communication.

1. Press and hold the MENU(SETUP) button.
2. Touch [ MY CALL ] on the LCD.

Advice
The time duration of the initial call sign start upscreen display may be changed from the Menu item
"005 MY CALL INDICATION".

3. Touch a character key. The touched character will be displayed at the top of the screen. Enter each character of your call sign.

Advice
Up to 10 characters (letters, numbers, and symbols) can be entered.

4. Touch [ ENT ] on the LCD. The call sign setting is completed and the display will switch to the frequency display screen.