Problems with LSB on IC706MKII
 

hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

Your injection frequency for the LSB mode probably isn't set correctly. You
didn't say how your audio sounded. If it is lacking low frequency response,
the injection frequency is too far down on the filter slope. This would also
account for the lower output power.
I am not familiar with the innards of this rig..............it is possible
that this could be corrected through a softkey menu. I am sure that this rig
probably has a service menu mode.

Pete

"mongo" wrote in message
...
On 15 May 2004 02:38:03 -0700, (chafik
CN8JV) wrote:

hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV
AM , FM & RTTY Tx OK?
Tried a CPU reset?
Might be the PLL or main board.
Service manual here;

http://www.acc.umu.se/~nor/.manual/i...ice_Manual.pdf

Your injection frequency for the LSB mode probably isn't set correctly. You
didn't say how your audio sounded. If it is lacking low frequency response,
the injection frequency is too far down on the filter slope. This would also
account for the lower output power.
I am not familiar with the innards of this rig..............it is possible
that this could be corrected through a softkey menu. I am sure that this rig
probably has a service menu mode.

Pete

"mongo" wrote in message
...
On 15 May 2004 02:38:03 -0700, (chafik
CN8JV) wrote:

hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV
AM , FM & RTTY Tx OK?
Tried a CPU reset?
Might be the PLL or main board.
Service manual here;

http://www.acc.umu.se/~nor/.manual/i...ice_Manual.pdf

I have a similar problem on USB. My receive audio dropped to barely
audible, and it sounded like people are talking from within a tin can. Got
a friend on air, we compared AM, FM, CW USB and LSB, and I listened to RTTY.
Everything received well except USB; LSB was a little off, I think.
Transmit was fine (5-8, 5-9). Wrote ICOM, they had 'no ideas for
troubleshooting.' Sent it back Friday (5/14) as it's still under warranty.

Will let'cha know what ICOM says!

73

Joe
N2LJD
"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

I have a similar problem on USB. My receive audio dropped to barely
audible, and it sounded like people are talking from within a tin can. Got
a friend on air, we compared AM, FM, CW USB and LSB, and I listened to RTTY.
Everything received well except USB; LSB was a little off, I think.
Transmit was fine (5-8, 5-9). Wrote ICOM, they had 'no ideas for
troubleshooting.' Sent it back Friday (5/14) as it's still under warranty.

Will let'cha know what ICOM says!

73

Joe
N2LJD
"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

Is the radio aligned properly? It's easy to check but if it's out of
alignment, it needs to go to a radio shop to be fixed since proper
calibration tools are needed.

To hear if it's aligned right:
- In AM mode, tune to a time station, such as CHU or WWV.
- Now listen to the station in both LSB and USB modes. Is the sound of the
clock tick the same, or close? If so the rig is aligned properly. If they
don't sound the same, the rig is out of alignment.

"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

Is the radio aligned properly? It's easy to check but if it's out of
alignment, it needs to go to a radio shop to be fixed since proper
calibration tools are needed.

To hear if it's aligned right:
- In AM mode, tune to a time station, such as CHU or WWV.
- Now listen to the station in both LSB and USB modes. Is the sound of the
clock tick the same, or close? If so the rig is aligned properly. If they
don't sound the same, the rig is out of alignment.

"Bob M." wrote:

"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

Is the radio aligned properly? It's easy to check but if it's out of
alignment, it needs to go to a radio shop to be fixed since proper
calibration tools are needed.

To hear if it's aligned right:
- In AM mode, tune to a time station, such as CHU or WWV.
- Now listen to the station in both LSB and USB modes. Is the sound of the
clock tick the same, or close? If so the rig is aligned properly. If they
don't sound the same, the rig is out of alignment.


Don't try it on CHU. They transmit a carrier and USB only.

Dave

"Bob M." wrote:

"chafik CN8JV" wrote in message
m...
hello my friends
I am using icom 706 MKII
on LSB, I get bad reports about
audio and modulation quality, and the output power is too low.
but on USB the output power is normal with good audio quality
and modulation!
any idea please
thanks 73 CN8JV

Is the radio aligned properly? It's easy to check but if it's out of
alignment, it needs to go to a radio shop to be fixed since proper
calibration tools are needed.

To hear if it's aligned right:
- In AM mode, tune to a time station, such as CHU or WWV.
- Now listen to the station in both LSB and USB modes. Is the sound of the
clock tick the same, or close? If so the rig is aligned properly. If they
don't sound the same, the rig is out of alignment.


Don't try it on CHU. They transmit a carrier and USB only.

Dave

"Bob M." ) writes:

To hear if it's aligned right:
- In AM mode, tune to a time station, such as CHU or WWV.
- Now listen to the station in both LSB and USB modes. Is the sound of the
clock tick the same, or close? If so the rig is aligned properly. If they
don't sound the same, the rig is out of alignment.


I think this check won't work using CHU. CHU transmits partial carrier
and upper sideband only, no LSB. Should be OK with WWV though.
.... Martin VE3OAT