K3 - Strange problem on 10 Meter SSB with power

[Roy Morris-6]

Hello Lyle,
I personally am not experiencing the low SSB output on any band, but I am considering going from the 2.7K filters in the K3 and KRX3 (matching filters) to the 2.8K filters.  I may be asking for trouble by doing this.  Is there any indication as far as you know that the filters may be a part of the "10 meter SSB output power problem"?  Thanks.  Roy Morris  W4WFB
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[KK7P]

> ...Is there any
> indication as far as you know that the filters may be a part
> of the "10 meter SSB output power problem"?

The problem I have been aware of is the LSB/USB power output difference.
  That seemed to be confined to 2.7 kHz filters, was related to the
center frequency offset, and should be fixed in the latest beta firmware.

73,

Lyle KK7P

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[Mike Kasrich]

I have the 2.8 filter installed so the problem is not limited to the 2.7.

Mike/aj9c

---- Lyle Johnson <[hidden email]> wrote:

> > ...Is there any
> > indication as far as you know that the filters may be a part
> > of the "10 meter SSB output power problem"?
>
> The problem I have been aware of is the LSB/USB power output difference.
>   That seemed to be confined to 2.7 kHz filters, was related to the
> center frequency offset, and should be fixed in the latest beta firmware.
>
> 73,
>
> Lyle KK7P
>
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[dj7mgq]

Hi Lyle,

I do not know if we all might be talking about various ills with similar
symptoms. It might be that more than effect might be behind the various
observations, imho.

What I have, to the best of my memory, observed in various firmware
versions is that there is/was a tendency for the K3 to have lower output
in SSB on both(?) sidebands than in CW or tune modes. The output is at
times 1dB less and at times 6 or more dB lower. This effect is stronger
at lower power levels than at higher and usually occurred after changing
the power level request while in SSB.

This was at times a major fubar, but in the newer versions of the K3
firmware on my K3 (#67) the situation has greatly improved. Because I
had sent more than one mail to Elecraft, in the distant past, about this
and the situation, at least for me, has been improving, I did not want
to harp about it.

For example, during our expedition to OY in early July such weirdness
only popped up very rarely. I have not tested the newest beta firmware
for this (yet).

I have the 2.7kHz filter in my K3.

vy 73 de toby, dd5fz



Lyle Johnson wrote:
> The problem I have been aware of is the LSB/USB power output difference.
>  That seemed to be confined to 2.7 kHz filters, was related to the
> center frequency offset, and should be fixed in the latest beta firmware.
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[Ian Maude]

Toby Deinhardt wrote:

> Hi Lyle,
>
> I do not know if we all might be talking about various ills with
> similar symptoms. It might be that more than effect might be behind
> the various observations, imho.
>
> What I have, to the best of my memory, observed in various firmware
> versions is that there is/was a tendency for the K3 to have lower
> output in SSB on both(?) sidebands than in CW or tune modes. The
> output is at times 1dB less and at times 6 or more dB lower. This
> effect is stronger at lower power levels than at higher and usually
> occurred after changing the power level request while in SSB.

Have you tried setting Config: TXG VCE to 3.0dB?

73 Ian

--

Ian J Maude, G0VGS
SysOp GB7MBC DX Cluster
Member RSGB, GQRP
K2 #4044 |K3 #455

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[Alexandr Kobranov]

Friends,
maybe we have to sort problems with SSB power level to permanent
problems and temporary problems.
Permanent lower level is possible to cure via VCE gain setting (I
suppose & hope).
Temporary problems are more complicated. I remember my problems with
miliwat output levels via KRX3 vith certain version of F/W, when firts
(after switching on) SSB TX attempt was 6 - 10dB lower below CW or
TUNE level. Just after one dit or dash in CW mode and going back to
SSB it was OK, level was like on CW (measured in 2tone test). It was
caused by combination of f/w level (maybe corrupted) and using TUN PWR
level other then -norm-.
Shortly after u/g to 2.10 (if I remember correctly) and switching TUN
PWR to -norm- this problem on miliwat output level dissapered. (and
now I am using 100mW on ANT port so not checked miliwat KXV3 output
intensively during last weeks with newest f/w).
Also I am not sure if such kind of temporary problems are also
reported with 10W version. (SSB power temporary dropped).
Or is it mainly with 100W version? Any other experience with miliwat
output?
Hope in Elecraft support they are tracking all reports and testing
reported behaviour to keep clear picture and plans for possible f/w
updates/bug elimination.
Maybe will be good to see some more comments from Elecraft support to
reduce individual doubts etc...

73!
lexa, ok1dst
K3/10 #727




Ian Maude napsal(a):

> Toby Deinhardt wrote:
>> Hi Lyle,
>>
>> I do not know if we all might be talking about various ills with
>> similar symptoms. It might be that more than effect might be behind
>> the various observations, imho.
>>
>> What I have, to the best of my memory, observed in various firmware
>> versions is that there is/was a tendency for the K3 to have lower
>> output in SSB on both(?) sidebands than in CW or tune modes. The
>> output is at times 1dB less and at times 6 or more dB lower. This
>> effect is stronger at lower power levels than at higher and usually
>> occurred after changing the power level request while in SSB.
> Have you tried setting Config: TXG VCE to 3.0dB?
>
> 73 Ian
>

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[Alexandr Kobranov]

> Temporary problems are more complicated. I remember my problems with
> miliwat output levels via KRX3 vith certain version of F/W,

correction -  should be KXV3 ....

my waiting for KRX3 is so intensive....
:-)

L. -dst-
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[dj7mgq]

> Have you tried setting Config: TXG VCE to 3.0dB?

It did not solve the problem. But as I said, at least the recent
frimware has been much better.

vy 73 de toby
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