[amsat-bb] Re: Cheap S-band Analyzer

Anthony Monteiro aa2tx at comcast.net
Fri Sep 29 06:57:31 PDT 2006

At 12:30 PM 9/28/2006 -0400, Bob McGwier wrote:

>This device is cute and looks like a really neat thing to play with.
>With a USB A-B cable extension,  this could find widespread usage for 
>Microwave and satellite types.  I only want to sound a small note of 
>caution before folks jump and buy.
>Signals that would cover up a signal on S band from either the P3E S band 
>system or even the (proposed louder) Eagle S band system will be beneath 
>this device's noise floor.  An 802.11, Blue Tooth,  microwave 
>oven,  cordless phone signal, etc. could be tens of dB louder than the 
>signals of interest in the proposed P3E or Eagle transponder downlinks and 
>this device would have no detectable response to them.
>What that note of caution, for $99,  it will be a really neat thing to 
>play with and it will be able to find the largest interlopers on your S 
>band passband for P3E and Eagle or AO-51.

Hi Bob,

Yes, this device is not even close to being able to receive
a satellite signal as-is. The built-in antenna is less than
1/2" long and WiFi is not a weak-signal mode anyway.

PE2ER has a mode to add an sma connector so you can use an
external antenna. The RF xcvr IC is useful to around -95 dBm0
so you need a good preamp and a good size antenna to get near
satellite signal levels.

I checked out the WiSpy web site and they are working on
a dual-band 2.4 and 5 GHz version with an external antenna connection.
It is not avialble yet but unless you need one now, it might
be better to wait for the new one.

Tony AA2TX

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