Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[dan edwards]

welcome to Flex world Brian! 73 OT, w5xz, dan...

--- On Tue, 2/14/12, Brian Miller  wrote:

From: Brian Miller 
Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER
To: t...@flexradio.com, "Jim Jannuzzo" 
Cc: flexradio@flex-radio.biz
Date: Tuesday, February 14, 2012, 12:07 PM

Thanks to everyone for the comments.

It does seem that the fluctuations in the output power meter readings are an 
artefact of the sampling/averaging process that drives the meter display. I 
will have a play with the multimeter options to see if there is a setting which 
provides a more meaningful result when sending CW.

73, Brian VK3MI ZL1AZE

-Original Message- From: Tim Ellison, W4TME
Sent: Tuesday, February 14, 2012 3:38 AM
To: Jim Jannuzzo
Cc: flexradio@flex-radio.biz ; t...@flexradio.com
Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

You can try lowering those time values and see what happens.

Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com <mailto:t...@flexradio.com>
Web: www.flexradio.com <http://www.flexradio.com>

logo


On 2/13/2012 11:31 AM, Jim Jannuzzo wrote:
> So, you could go to Setup | Display tab, and change the Multimeter options, 
> correct?  Which option would most effectively show the almost real time 
> power-  decrease Multimeter Average Time, or increase one of the related 
> Refresh rates, or decrease one of hte Peak Hold times?
> Jim KJ2P
> > Date: Mon, 13 Feb 2012 10:44:36 -0500
> > From: t...@flex-radio.com
> > To: flexradio@flex-radio.biz
> > Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER
> >
> > Ray hit the nail on the head. It does have to do with the sampling
> > cycle frequency and the RF at that point in time.
> >
> > Tim Ellison, W4TME
> > Product Management, Sales & Support
> > FlexRadio Systems^(TM)
> > 4616 W Howard Ln, Suite 1-150
> > Austin, TX 78728
> > Phone: 512-535-4713 Ext. 223
> > Email: t...@flexradio.com <mailto:t...@flexradio.com>
> > Web: www.flexradio.com <http://www.flexradio.com>
> >
> > logo
> >
> >
> > On 2/13/2012 8:32 AM, Ray, K9DUR wrote:
> > > Brian,
> > >
> > > I believe that that is normal. Without looking into the code to be
> certain,
> > > I would guess that the meter samples the output at some interval&
> averages
> > > the result. Depending upon how the samples line up with the cw
> waveform,
> > > the average power during any one sample period will vary.
> > >
> > > 73, Ray, K9DUR
> > > http://k9dur.info
> > >
/ 

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Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Brian Miller]

Thanks to everyone for the comments.

It does seem that the fluctuations in the output power meter readings are an 
artefact of the sampling/averaging process that drives the meter display. I 
will have a play with the multimeter options to see if there is a setting 
which provides a more meaningful result when sending CW.


73, Brian VK3MI ZL1AZE

-Original Message- 
From: Tim Ellison, W4TME

Sent: Tuesday, February 14, 2012 3:38 AM
To: Jim Jannuzzo
Cc: flexradio@flex-radio.biz ; t...@flexradio.com
Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

You can try lowering those time values and see what happens.

Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com <mailto:t...@flexradio.com>
Web: www.flexradio.com <http://www.flexradio.com>

logo


On 2/13/2012 11:31 AM, Jim Jannuzzo wrote:
So, you could go to Setup | Display tab, and change the Multimeter 
options, correct?  Which option would most effectively show the almost 
real time power-  decrease Multimeter Average Time, or increase one of the 
related Refresh rates, or decrease one of hte Peak Hold times?

Jim KJ2P
> Date: Mon, 13 Feb 2012 10:44:36 -0500
> From: t...@flex-radio.com
> To: flexradio@flex-radio.biz
> Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER
>
> Ray hit the nail on the head. It does have to do with the sampling
> cycle frequency and the RF at that point in time.
>
> Tim Ellison, W4TME
> Product Management, Sales & Support
> FlexRadio Systems^(TM)
> 4616 W Howard Ln, Suite 1-150
> Austin, TX 78728
> Phone: 512-535-4713 Ext. 223
> Email: t...@flexradio.com <mailto:t...@flexradio.com>
> Web: www.flexradio.com <http://www.flexradio.com>
>
> logo
>
>
> On 2/13/2012 8:32 AM, Ray, K9DUR wrote:
> > Brian,
> >
> > I believe that that is normal. Without looking into the code to be
certain,
> > I would guess that the meter samples the output at some interval&
averages
> > the result. Depending upon how the samples line up with the cw
waveform,
> > the average power during any one sample period will vary.
> >
> > 73, Ray, K9DUR
> > http://k9dur.info
> >
/ 



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Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Tim Ellison, W4TME]

You can try lowering those time values and see what happens.

Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com <mailto:t...@flexradio.com>
Web: www.flexradio.com <http://www.flexradio.com>

logo


On 2/13/2012 11:31 AM, Jim Jannuzzo wrote:
So, you could go to Setup | Display tab, and change the Multimeter 
options, correct?  Which option would most effectively show the almost 
real time power-  decrease Multimeter Average Time, or increase one 
of the related Refresh rates, or decrease one of hte Peak Hold times?

Jim KJ2P
> Date: Mon, 13 Feb 2012 10:44:36 -0500
> From: t...@flex-radio.com
> To: flexradio@flex-radio.biz
> Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER
>
> Ray hit the nail on the head. It does have to do with the sampling
> cycle frequency and the RF at that point in time.
>
> Tim Ellison, W4TME
> Product Management, Sales & Support
> FlexRadio Systems^(TM)
> 4616 W Howard Ln, Suite 1-150
> Austin, TX 78728
> Phone: 512-535-4713 Ext. 223
> Email: t...@flexradio.com <mailto:t...@flexradio.com>
> Web: www.flexradio.com <http://www.flexradio.com>
>
> logo
>
>
> On 2/13/2012 8:32 AM, Ray, K9DUR wrote:
> > Brian,
> >
> > I believe that that is normal. Without looking into the code to be 
certain,
> > I would guess that the meter samples the output at some interval& 
averages
> > the result. Depending upon how the samples line up with the cw 
waveform,

> > the average power during any one sample period will vary.
> >
> > 73, Ray, K9DUR
> > http://k9dur.info
> >
> >
> >
> > ___
> > FlexRadio Systems Mailing List
> > FlexRadio@flex-radio.biz
> > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
> > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
> > Knowledge Base: http://kc.flexradio.com/ Homepage: 
http://www.flexradio.com/

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http://www.flexradio.com/

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Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Jim Jannuzzo]

So, you could go to Setup | Display tab, and change the Multimeter options, 
correct?  Which option would most effectively show the almost real time power-  
decrease Multimeter Average Time, or increase one of the related Refresh rates, 
or decrease one of hte Peak Hold times? Jim KJ2P > Date: Mon, 13 Feb 2012 
10:44:36 -0500
> From: t...@flex-radio.com
> To: flexradio@flex-radio.biz
> Subject: Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER
> 
> Ray hit the nail on the head.  It does have to do with the sampling 
> cycle frequency and the RF at that point in time.
> 
> Tim Ellison, W4TME
> Product Management, Sales & Support
> FlexRadio Systems^(TM)
> 4616 W Howard Ln, Suite 1-150
> Austin, TX 78728
> Phone: 512-535-4713 Ext. 223
> Email: t...@flexradio.com <mailto:t...@flexradio.com>
> Web: www.flexradio.com <http://www.flexradio.com>
> 
> logo
> 
> 
> On 2/13/2012 8:32 AM, Ray, K9DUR wrote:
> > Brian,
> >
> > I believe that that is normal.  Without looking into the code to be certain,
> > I would guess that the meter samples the output at some interval&  averages
> > the result.  Depending upon how the samples line up with the cw waveform,
> > the average power during any one sample period will vary.
> >
> > 73, Ray, K9DUR
> > http://k9dur.info
> >
> >
> >
> > ___
> > FlexRadio Systems Mailing List
> > FlexRadio@flex-radio.biz
> > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
> > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
> > Knowledge Base: http://kc.flexradio.com/  Homepage: 
> > http://www.flexradio.com/
> ___
> FlexRadio Systems Mailing List
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> Knowledge Base: http://kc.flexradio.com/  Homepage: http://www.flexradio.com/
  
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Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Tim Ellison, W4TME]

Ray hit the nail on the head.  It does have to do with the sampling 
cycle frequency and the RF at that point in time.


Tim Ellison, W4TME
Product Management, Sales & Support
FlexRadio Systems^(TM)
4616 W Howard Ln, Suite 1-150
Austin, TX 78728
Phone: 512-535-4713 Ext. 223
Email: t...@flexradio.com 
Web: www.flexradio.com 

logo


On 2/13/2012 8:32 AM, Ray, K9DUR wrote:

Brian,

I believe that that is normal.  Without looking into the code to be certain,
I would guess that the meter samples the output at some interval&  averages
the result.  Depending upon how the samples line up with the cw waveform,
the average power during any one sample period will vary.

73, Ray, K9DUR
http://k9dur.info



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Re: [Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Ray, K9DUR]

Brian,

I believe that that is normal.  Without looking into the code to be certain,
I would guess that the meter samples the output at some interval & averages
the result.  Depending upon how the samples line up with the cw waveform,
the average power during any one sample period will vary.

73, Ray, K9DUR
http://k9dur.info



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[Flexradio] FLEX-3000 FLUCTUATING CW OUTPUT POWER

[Brian Miller]

I have recently acquired a new Flex-3000 radio (running SDR v2.2.3) and have 
been giving it a test drive into a dummy load. All seems well except that 
the output power reading on the TX meter fluctuates from about 70W to 105W 
when transmitting CW dots or dashes at 30 wpm and 100% drive. Is this degree 
of fluctuation normal? Or is it an artefact of the meter design?


I note that there is no significant fluctuation when operating in the TUNE 
mode or when transmitting an unmodulated AM carrier. I also note that the 
problem is evident at low and high drive levels so does not seem to be 
related to RFI.


Any advice would be appreciated.

Thanks and 73, Brian VK3MI 



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