Index: src/fill_fblock.c
===================================================================
--- src/fill_fblock.c	(revision 9894)
+++ src/fill_fblock.c	(working copy)
@@ -23,6 +23,7 @@
         ibandB,
         irfAfid,
         irfBfid,
+        idfABfid,
         ants[64],
         swapped,
         present,
@@ -44,7 +45,8 @@
     DifxBaseline *pbl;
     DifxDatastream *pdsA,
                    *pdsB;
-    DifxFreq *pfr;
+    DifxFreq *pfr,
+             *pdfr;
 
 
                                     // first fill in the frequency block structure
@@ -55,6 +57,8 @@
         pdsB = D->datastream + pbl->dsB;
         for (i=0; i<pbl->nFreq; i++)
             {
+            idfABfid = pbl->destFq[i];
+            pdfr = D->freq + idfABfid;
             for (j=0; j<*pbl->nPolProd; j++)
                 {
                 ibandA = pbl->bandA[i][j];
@@ -76,6 +80,13 @@
                     irfAfid = pdsA->zoomFreqId[irbAfid];
                     pfr = D->freq + irfAfid;
                     }
+                if (irfAfid != idfABfid)
+                    {               // bandA is member of outputband; register the output instead!
+                    //printf("info: .inp baseline %d pol %d: A fq %d != destFq %d, using destFq instead and mark as Zoom\n", i, j, irfAfid, idfABfid);
+                    pfr = pdfr;
+                    zoom = TRUE;
+                    irfAfid = idfABfid;
+                    }
                                     // stuff ref station fblock structure
                 pfb[nprod].stn[0].pol      = pol;
                 pfb[nprod].stn[0].ant      = pdsA->antennaId;
@@ -105,6 +116,13 @@
                     irfBfid = pdsB->zoomFreqId[irbBfid];
                     pfr = D->freq + irfBfid;
                     }
+                if (irfBfid != idfABfid)
+                    {               // bandB is member of outputband; register the output instead!
+                    //printf("info: .inp baseline %d pol %d: B fq %d != destFq %d, using destFq instead and mark as Zoom\n", i, j, irfBfid, idfABfid);
+                    pfr = pdfr;
+                    zoom = TRUE;
+                    irfBfid = idfABfid;
+                    }
                                     // stuff rem station fblock structure
                 pfb[nprod].stn[1].pol      = pol;
                 pfb[nprod].stn[1].ant      = pdsB->antennaId;