[Flexradio] [SPAM] Frequency change by "slidingacrosspanadapter"

Rhett Isley kb4hg at windstream.net
Sat May 23 13:30:16 EDT 2009 

To the List,

So can the communication that is accomplished today over FireWire be  
accomplished over Gig-Ethernet?

Has anyone tried this? What would you do, build a two node flat IP  
network?

Could this also be a solution in lieu of  FlexWire. Using an  
inexpensive Gig-E switch and Cat 6e wires, build a little LAN for  
your SDR and peripherals?

Just thinking out loud... Comments?

73,
Rhett, KB4HG
Sanford, NC


On May 23, 2009, at 10:54 AM, Clay W7CE wrote:

> Based on my early experience with the 5000A, it seems like the  
> FireWire interface is source of many of the latency and hanging  
> issues, although I'm not sure if that is the case here.  Firewire  
> seems to work best when sending single threaded data streams, like  
> from a video camera.  I have no doubt that the Firewire-related  
> issues that cause so many problems would totally disappear if Flex  
> were to abandon it in favor of an Gigabit Ethernet interface.  The  
> PC and software vendors make Ethernet performance a much higher  
> priority than Firewire performance.  Given the small number of  
> Firewire-compatible devices available on the market, I doubt if  
> that will ever change.
>
> 73,
> Clay  W7CE
>
> ----- Original Message ----- From: "Tim Ellison" <tellison at itsco.com>
> To: "Clay W7CE" <w7ce at curtiss.net>; "Flexradio at Flex-Radio. Biz"  
> <flexradio at flex-radio.biz>
> Sent: Saturday, May 23, 2009 6:53 AM
> Subject: RE: [SPAM] Re: [Flexradio] [SPAM] Frequency change by  
> "slidingacrosspanadapter"
>
>
> It really isn't a problem but more of an anomaly dependent on the  
> PC and how well it performs with PowerSDR.
>
> Unfortunately, this condition is not only a function of raw  
> processing power and I/O throughput in your computer, but also of  
> timing when things happen in the software which all factors into  
> the computational overhead used by PowerSDR.
>
> Setting the process priority to "Real Time" might help, but doing  
> so can also cause other problems by taking away priority from  
> operating system level processes that need to run when needed so  
> that the entire computer operates correctly. The display thread is  
> a low priority thread for a reason - to ensure that you have  
> consistent audio out of the radio.   There is no "silver bullet"  
> fix as there are way to many inter-related variables in play from  
> the hardware to the operating system and to the software itself  
> that one setting fixes all systems.  I know that Dudley wishes  
> there was a silver bullet fix for PowerSDR and PC performance  
> related issues.  His life would get exponentially simpler.
>
> The bottom line is that if that trick works for your particular  
> system, then that is great. Use it by all means.
>
>
> -Tim
>
> -----Original Message-----
> From: flexradio-bounces at flex-radio.biz [mailto:flexradio- 
> bounces at flex-radio.biz] On Behalf Of Clay W7CE
> Sent: Saturday, May 23, 2009 3:03 AM
> To: Flexradio at Flex-Radio. Biz
> Subject: [SPAM] Re: [Flexradio] [SPAM] Frequency change by "sliding  
> acrosspanadapter"
>
> Thanks Eric.  Now I understand the issue.  Could setting the  
> PowerSDR process priority to "Real Time" be a possible solution?  I  
> found that my setup runs very well with this setting and I haven't  
> seen any problems with the Panadapter when SR is off.  My computer  
> is a 1.8G Dual Core Centrino Laptop using the built-in Firewire  
> adapter, so it's not exactly at the high power end of the computing  
> spectrum.
>
> 73,
> Clay  W7CE
>
> ----- Original Message -----
> From: "Eric Wachsmann" <eric at flex-radio.com>
> To: "Clay W7CE" <w7ce at curtiss.net>
> Cc: "Flexradio at Flex-Radio. Biz" <flexradio at flex-radio.biz>
> Sent: Friday, May 22, 2009 10:45 PM
> Subject: Re: [Flexradio] [SPAM] Frequency change by "sliding  
> acrosspanadapter"
>
>
>> This is a function of raw processing power and what else is going on
>> in the machine.  The point is that with SR off, dragging the spectrum
>> is much more expensive computationally as it sends a tuning command
>> for each pixel dragged.  This can cause lower priority threads (like
>> the display) to stall if the CPU can't keep up.
>>
>>
>> Eric Wachsmann
>> FlexRadio Systems
>>
>> On Fri, May 22, 2009 at 7:44 PM, Clay W7CE <w7ce at curtiss.net> wrote:
>>
>>> I'm confused.  I can "click and drag" the panadapter for the full
>>> width of my computer screen (even outside the PowerSDR window once I
>>> start
>>> dragging)
>>> regardless of the Spur Reduction setting.  What am I missing here?
>>>
>>> 73,
>>> Clay  W7CE
>>>
>>> ----- Original Message ----- From: "NZ8J" <nz8j at woh.rr.com>
>>> To: "'Tim Ellison'" <tellison at itsco.com>
>>> Cc: "Flexradio at Flex-Radio. Biz" <flexradio at flex-radio.biz>
>>> Sent: Friday, May 22, 2009 2:12 PM
>>> Subject: Re: [Flexradio] [SPAM] Frequency change by "sliding
>>> acrosspanadapter"
>>>
>>>
>>>
>>>  Now I feel foolish.. Yes it was off and when I turned it on it  
>>> works
>>>> like I was accustomed to.
>>>>
>>>> Thanks Tim...
>>>>
>>>> 73
>>>> Tim
>>>> NZ8J
>>>>
>>>> -----Original Message-----
>>>> From: Tim Ellison [mailto:tellison at itsco.com]
>>>> Sent: Friday, May 22, 2009 5:08 PM
>>>> To: NZ8J; Flexradio at Flex-Radio. Biz
>>>> Subject: RE: [SPAM] [Flexradio] Frequency change by "sliding across
>>>> panadapter"
>>>>
>>>>
>>>> Is spur reduction turned off?
>>>>
>>>>
>>>>
>>>> -Tim
>>>>
>>>> -----Original Message-----
>>>> From: flexradio-bounces at flex-radio.biz
>>>> [mailto:flexradio-bounces at flex-radio.biz] On Behalf Of NZ8J
>>>> Sent: Friday, May 22, 2009 5:05 PM
>>>> To: Flexradio at Flex-Radio. Biz
>>>> Subject: [SPAM] [Flexradio] Frequency change by "sliding across
>>>> panadapter"
>>>>
>>>> Wasn't really sure how to title this. Up until a day or so ago I  
>>>> was
>>>> able to smoothly change the freq on my Flex 5K (1.18.0) by  left
>>>> clicking and holding while sliding across the panadapter. Now  
>>>> all of
>>>> a sudden it will slide part way and then hang up. If I let up on  
>>>> the
>>>> mouse and click again I can continue fine.
>>>>
>>>> I haven't changed anything that I can recall.  Changing the freq
>>>> this way on "Betty" works fine, no problems.  The CPU usage is down
>>>> around 10% to 15%.  It doesn't change when the slider hangs up.
>>>>
>>>> Any suggestions?
>>>> Thanks
>>>> Tim
>>>> NZ8J
>>>> _______________________________________________
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>>>>
>>>>
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>>>> FlexRadio Systems Mailing List
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>>>> Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/
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>>>> http://www.flex-radio.com/
>>>>
>>>
>>>
>>> _______________________________________________
>>> FlexRadio Systems Mailing List
>>> FlexRadio at flex-radio.biz
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>>> http://www.flex-radio.com/
>>>
>>
>
>
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