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Hi Jan,
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<div>I believe DIFX basically ignores this anyhow and certainly has no way to handle arbitrary “track” mapping, (ie all 8 bit have to be contagious). I may have forgotten the details, but I am pretty sure “CH01” is assumed to be the first channel, so I don’t
think it matters much. Certainly I never create a proper track mapping and definitely not with all 8 bits defined.</div>
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<div>Cheers</div>
<div>Chris</div>
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<blockquote type="cite">
<div>On 3 Nov 2023, at 21:43, Jan Wagner via Difx-users <difx-users@listmgr.nrao.edu> wrote:</div>
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<div dir="ltr">Hi list,<br>
<br>
vex2difx has gotten pickier about VEX syntax, when a VDIF station is missing fanout_def's from $TRACK the station is dropped from correlation.
<br>
<br>
With 1-bit or 2-bit VDIF recordings the $TRACK fanout_def's work. For 8-bit VDIF data, however, vex2difx complains "Note: getBits: Mode=... differing number of bits: 8,2" and that "some metadata may be incorrect".<br>
<br>
v2d: <br>
format=VDIF/8224/8
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VEX:<br>
def VDIF.1Ch8bit1to1;<br>
track_frame_format = VDIF8224;</div>
<div> fanout_def = : &CH01 : sign : 1: 1;<br>
fanout_def = : &CH01 : mag : 1: 2;<br>
fanout_def = : &CH01 : mag : 1: 3;<br>
fanout_def = : &CH01 : mag : 1: 4;<br>
fanout_def = : &CH01 : mag : 1: 5;<br>
fanout_def = : &CH01 : mag : 1: 6;<br>
fanout_def = : &CH01 : mag : 1: 7;<br>
fanout_def = : &CH01 : mag : 1: 8;<br>
enddef;<br>
<br>
Is there a correct way to declare it?<br>
<br>
I didn't find any mention of 8-bit (or 4-bit, or 2-bit Complex) or generic cases under
<a href="https://safe.nrao.edu/wiki/bin/view/VLBA/Vex2doc">https://safe.nrao.edu/wiki/bin/view/VLBA/Vex2doc</a><br>
<br>
regards,<br>
Jan</div>
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