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Re: [Discuss-gnuradio] Question Regarding GMSK2 examples

From: Elaine Garbarine
Subject: Re: [Discuss-gnuradio] Question Regarding GMSK2 examples
Date: Tue, 02 May 2006 00:34:50 -0400
User-agent: Microsoft-Entourage/

On 5/2/06 12:29 AM, "Eric Blossom" <address@hidden> wrote:

> On Tue, May 02, 2006 at 12:01:47AM -0400, Elaine Garbarine wrote:
>> That makes sense to me.  Is there anyway to access the payload even if the
>> data is not decoded correctly?  I know this seems like a useless concept but
>> it's something we would like to do.
> Yes, the payload (with errors) is passed even if ok is False.
>> Also, a quasi-related question, the README file included in the GMSK2
>> directory makes a note that the boards must be at least 3m apart in order
>> for the rx to work properly.  Why is it necessary to place the boards at
>> least 3m apart?
> It's so that the transmitter doesn't drive the receiver's front end
> into a seriously non-linear zone.  The Flex 400 Tx section will put
> out about 100 mW, which is enough to cause intermodulation distortion
> (IMD) on most receivers if they're close by.  For demos using amateur
> handhelds as receivers, we've replaced the transmit antenna on the
> Flex 400 (oops, that's the daughterboard formerly known as the Flex
> 400) with a 50 ohm load to avoid the problem.
> Bottom line, it's the non-ideal analog stuff ;)
> Eric

Got it.  

Am I safe to assume the 3m distance would also apply to the daughterboard
formerly known as the Flex 2400?


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