One watt out is no small amount of power.

You must have less than 5milliwatts of in power,
then you have small out power.
So long as you are not building the power
with a bank of capacitors or ???

You can never have a total combined power
of more coming out than you put
into it.
So says entropy.not me.

Regards,
geoff





----- Original Message ----- 
From: 
To: 
Sent: Monday, September 12, 2011 8:04 PM
Subject: Re: Re: WinSDR Wireless Interference?


> Hi Robert
>             strange problem,  I also wouldnt suspect the VERY low power from Wi Fi to cause a problem, its less than 1Watt. With 
> all my amateur radio gear in my shack with power levels from 10W to 150W  it has never caused the A-D board to loose connection 
> with the SDR computer. The worse that happens, particularly on frequencies less than 450MHz is that I get big spikes ( up to ~ 
> 2000 data points) on the SDR trace as the cable from the sensor to the preamp acts as an antenna and picks up induced RF. I dont 
> see any of those problems on the 1.2, 2.4, 5.7 or 10GHz bands.
> WiFi is on 2.4GHz
>
>  Loosing all traces infers that either the A-D card is loosing power or there is a connection problem between the A-D card and the 
> SDR computer.
> Will be interesting to see what the eventual cause and remedy is  :)
>
> cheers
> Dave N
> Sydney
>
>
>> Robert Thomasson  wrote:
>>
>> Jerry,
>>
>> Thanks for your reply.  No, there is not a totally blank screen.  The
>> WinSDR
>> screen stays there but there are no seismometer wiggles (hope we're not
>> losing our layman audience here)  on it.  There are no lines at all, no
>> straight lines and no seismo wiggly lines.  I have to reboot WinXP to
>> get it
>> up and running again and when it comes back, there are the straight
>> green
>> lines for the time period that WinSDR was having it's problem.   But
>> again,
>> when the problem happens there are no lines at all, just the blank
>> WinSDR
>> system window as if I'd opened the program without a seismometer
>> connected.
>>
>> I have checked the cable connections and all other connections literally
>> dozens of times and I also don't get the same symptoms of a blank WinSDR
>> screen when I disconnect a cable.
>>
>> When WinSDR goes into its problem mode, I can't just close it and
>> re-open it
>> to get it running again.  It will open but not connect to the seismo.  I
>> have to reboot WinXP to get WinSDR running again.
>>
>> I agree that it seems unlikely that it's a frequency/antenna problem but
>> I've convinced myself that it only happens when the router or wireless
>> computer starts transmitting data.
>>
>> Thanks,
>>
>> Bob
>>
>>
>>
>> Now that I've gone public with this problem, I can rest assured that the
>> solution will be something embarrassingly simple.
>>
>> Bob
>>
>> On Mon, Sep 12, 2011 at 3:40 PM,  wrote:
>>
>> >   By "loosing trace", do you mean totally blank screen or a line drawn
>> *without
>> > the seismometer wiggles?*
>> > **
>> > I ask because I had a connection problem arise between my sensor and
>> > Larry's A/D box.  For convenience, I had added right-angle adapters at
>> the
>> > box connectors.  One adapter frequently lost the connection from the
>> sensor
>> > and all that was displayed on the computer was a straight green line.
>> I
>> > removed the adapter and it worked fine.
>> >
>> > I too am using an old Dell running XP, but do have it connected to the
>> > LAN.  I know that this probably does not answer your problem, but I
>> doubt
>> > seriously that it is frequency / antenna problem.
>> >
>> > Regards,
>> > Jerry Payton
>> > ------------------------------
>> >
>> >  *From:* Robert Thomasson 
>> > *Sent:* Monday, September 12, 2011 5:01 PM
>> > *To:* psnlist@..............
>> > *Subject:* WinSDR Wireless Interference?
>> >
>> >
>> > I have had some trouble keeping my WinSDR up and running.  It
>> frequently
>> > shows just a blank screen, with all helicord traces gone.  Just as if
>> I'd
>> > just opened the software without a seismometer connected to the
>> computer.
>> > The computer is an older Dell with a 2 GHz processor and 512 Mb RAM,
>> running
>> > WinXP with I think service pack 3.
>> >
>> > What is interesting about this phenomenon is that there is a wireless
>> > router in the house (the seismo server has no wireless capability and
>> is not
>> > connected to the network) and WinSDR will work fine until someone sits
>> down
>> > at another computer and the wireless network starts exchanging
>> traffic.
>> > Then the WinSDR screen loses the displayed data and goes blank.
>> >
>> > Is it possible that somehow the USB cable from the seismometer to the
>> > seismo server computer  is acting as an antenna and picking up enough
>> > interference from the 2++GHz wireless LAN system to crash WinSDR?
>> WinSDR
>> > does not actually crash, it just loses the data traces, which
>> disappear.  My
>> > next step is to dig out some old books and see if I can figure out
>> what
>> > length the seismo cable would have to be to resonate at the wireless
>> LAN
>> > frequency.   But I think it would have to be very short?
>> >
>> > This is another unexpected educational aspect of this hobby!   Just
>> > wondering if anyone else has experienced this issue?
>> >
>> > Thanks,
>> >
>> > Bob
>> >
>> >
>> >
>> >
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSNLIST)
>
> To leave this list email PSNLIST-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> 

__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.