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#11
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Yaesu FT-991 AM transmission defective
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#12
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Yaesu FT-991 AM transmission defective
In article ,
Fred McKenzie wrote: I recently updated the FT-991 firmware to the July 24, 2015, version. The update fixed some minor problems, but did not affect AM operation as far as I can tell. A new update to the FT-991 "Main" firmware was posted on August 17. The only obvious improvement was the addition of another GPS option. I can not tell any difference in AM operation. One thing I did notice, was an occasional event where the radio stops responding to its controls. One way to correct it is to cycle power. Another is to keep trying different controls until you find one that does something. Afterward, the others seem to start working again. I suspect the problem may be time related, and it would start working again if I just waited a minute or two! Fred K4DII |
#13
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Yaesu FT-991 AM transmission defective
On Thu, 20 Aug 2015 23:32:58 -0400, Fred McKenzie wrote:
A new update to the FT-991 "Main" firmware was posted on August 17. The only obvious improvement was the addition of another GPS option. I can not tell any difference in AM operation. One thing I did notice, was an occasional event where the radio stops responding to its controls. One way to correct it is to cycle power. Another is to keep trying different controls until you find one that does something. Afterward, the others seem to start working again. I suspect the problem may be time related, and it would start working again if I just waited a minute or two! Yikes!! *Not A Good Thing* (tm) for a contesting rig. Jonesy -- Marvin L Jones | W3DHJ | W3DHJ | http://W3DHJ.net/ Pueblo, Colorado | @ | Jonesy | __ 38.238N 104.547W | jonz.net | DM78rf | 73 SK |
#14
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Yaesu FT-991 AM transmission defective
In article ,
Fred McKenzie wrote: In article , Fred McKenzie wrote: I recently updated the FT-991 firmware to the July 24, 2015, version. The update fixed some minor problems, but did not affect AM operation as far as I can tell. A new update to the FT-991 "Main" firmware was posted on August 17. The only obvious improvement was the addition of another GPS option. I can not tell any difference in AM operation. One thing I did notice, was an occasional event where the radio stops responding to its controls. One way to correct it is to cycle power. Another is to keep trying different controls until you find one that does something. Afterward, the others seem to start working again. I suspect the problem may be time related, and it would start working again if I just waited a minute or two! Another "Main" Firmware Update was released August 25. I installed it today. The only response problem was when I first fired it up after the update. So far, it seems to be working OK. I have not tried to check AM operation yet. Fred K4DII |
#15
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Yaesu FT-991 AM transmission defective
On Friday, January 30, 2015 at 2:30:06 AM UTC-6, wa7kgx wrote:
My initial testing on an FT-991 I bought Tuesday indictaes AM transmission is severely distorted. I tried everything in the manual that seemed relevant to AM transmission without any improvement. Transmitting into a Cobra Senior perfectly matched with a Nye Viking MBII on 3885 showed pronounced downward modulation even on a peak reading MFJ 870 meter. Normally a peak reading watt meter will show strong upward movement as the peak power is 4 times carrier power. I called Yaesu tech support. The tech was not aware of any prolbems with AM on the 991. He suggested I reset the processor. After the processor reset returned the 991 to its factory defaults, the 3885 morning crowd confirmed the transmitted signal was still terrible. I have been able to get good results transmitting AM with many oher radios including IC706mkiiG, 756Pro, and FlexRadio 5000a. A quick check on 2 meters showed the same profound downward modulation on the FT-991. Anyone having better luck with AM on the FT-991? -de WA7KGX I just got the FT-991, and have the same poor audio on transmission in AM mode. Has there been any luck in finding a fix? Thanks, N4RCC, Richard |
#16
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Yaesu FT-991 AM transmission defective
On Sunday, December 27, 2015 at 10:48:46 PM UTC-5, N4RCC - Richard wrote:
On Friday, January 30, 2015 at 2:30:06 AM UTC-6, wa7kgx wrote: My initial testing on an FT-991 I bought Tuesday indictaes AM transmission is severely distorted. I tried everything in the manual that seemed relevant to AM transmission without any improvement. Transmitting into a Cobra Senior perfectly matched with a Nye Viking MBII on 3885 showed pronounced downward modulation even on a peak reading MFJ 870 meter. Normally a peak reading watt meter will show strong upward movement as the peak power is 4 times carrier power. I called Yaesu tech support. The tech was not aware of any prolbems with AM on the 991. He suggested I reset the processor. After the processor reset returned the 991 to its factory defaults, the 3885 morning crowd confirmed the transmitted signal was still terrible. I have been able to get good results transmitting AM with many oher radios including IC706mkiiG, 756Pro, and FlexRadio 5000a. A quick check on 2 meters showed the same profound downward modulation on the FT-991. Anyone having better luck with AM on the FT-991? -de WA7KGX I just got the FT-991, and have the same poor audio on transmission in AM mode. Has there been any luck in finding a fix? Thanks, N4RCC, Richard I have same problem with my 991 bought in June 15.it sound a little better when I use MD100 desk mic on hi emphasis Bob Meyer WA9M |
#17
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Yaesu FT-991 AM transmission defective
Dr OM,
It's likeley that the AM carrier level in the service menu is set wrong. Maybe interesting to read: http://www.amateurtele.com/index.php...el=168&id=#752 This is an article about the FT-991 and how to adjust the AM carrier level. 73 de PE2CJ. |
#18
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Yaesu FT-991 AM transmission defective
On Monday, February 8, 2016 at 3:13:48 PM UTC-5, wrote:
Dr OM, It's likeley that the AM carrier level in the service menu is set wrong. Maybe interesting to read: http://www.amateurtele.com/index.php...el=168&id=#752 This is an article about the FT-991 and how to adjust the AM carrier level. 73 de PE2CJ. GM OM With my 991 I cannot set the alc level it is at max no matter where the carrier level or mic gain is set on 6m.On hf bands it seems to work properly u can set the alc level.I have not been able to get audio rpts on 10 AM yet. I am wondering if there are enough complaints to Yaesu if they will look in to problem.Probably maybe a recall would be in order,that would invole sending radios back to factory. I have been on website and left a email,but have had no reply.I think a phone call from 991 owners might alert them to the problem. 73 Bob WA9M |
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