[linrad] Re: MAP65 and Linrad Network

[Joe Taylor <Princeton.EDU; joe@xxxxxxxxxxxxxxxx>]

HI Leif and all,

Many thanks for your most helpful response.

I had more or less figured out your explanation of userx_no, 
and now I understand that I *do* have a high-side LO in the 
RX10700.  Well and good.

I should have remembered that FFT Version 5 is floating 
point.  I will use it in future for FFT1, since my computer 
supports the SSE instructions.  I will try setting up the 
amplitude margins for the downstream processing as you describe.

I've noticed one interesting thing while playing with MAP65 
today.  Even though I have assigned its "recvpkt" thread an 
"ABOVE_NORMAL" priority, I can cause it to drop UDP packets 
by having Windows do various things.  (For example, starting 
up the Windows Task Manager.)  The number of lost packets is 
normally small (say 1-5), and since there are some 33000 
packets in a one-minute data block, the losses are probably 
negligible.  I will watch it, and probably put in a warning 
flag or something.

If anyone is interested in testing an early version of 
MAP65, please let me know.  I can probably make one 
available fairly soon.  You will need two computers with a 
network connection between them.  The MAP65 computer should 
have 1 GB or more of memory.

	-- 73, Joe, K1JT

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