Index: src/difx2mark4.h
===================================================================
--- src/difx2mark4.h	(revision 9481)
+++ src/difx2mark4.h	(working copy)
@@ -31,7 +31,7 @@
 #define NUMFILS 500                 // max number of type 1 output files
 #define MAGLIM 10000.0              // threshold magnitude for vis. rejection
 #define MAX_FPPAIRS 5000            // dimensioned for b-lines x chans x pol_prods
-#define MAX_DFRQ 100                // allowed max number of *DiFX* frequencies
+#define MAX_DFRQ 200                // allowed max number of *DiFX* frequencies
 #define NVRMAX 4000000              // max # of vis records
 
 enum booleans {FALSE, TRUE};
Index: src/fill_fblock.c
===================================================================
--- src/fill_fblock.c	(revision 9481)
+++ src/fill_fblock.c	(working copy)
@@ -23,6 +23,7 @@
         ibandB,
         irfAfid,
         irfBfid,
+        idfABfid,
         ants[64],
         swapped,
         present,
@@ -39,12 +40,13 @@
          buff[6];
 
     double temp,
-           freqs[128];
+           freqs[MAX_DFRQ];
 
     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;
@@ -171,7 +189,7 @@
                     if (!present)
                         freqs[nfreq++] = pfb[n].stn[k].freq;
                                     // sanity check
-                    if (nfreq > 128)
+                    if (nfreq > MAX_DFRQ)
                         {
                         printf ("too many frequencies; redimension\n");
                         return -1;
Index: src/normalize.c
===================================================================
--- src/normalize.c	(revision 9481)
+++ src/normalize.c	(working copy)
@@ -58,6 +58,11 @@
     nf = -1;
     while (pfb[++nf].stn[REF].ant >= 0) // check for end-of-table marker
         {
+        if (nf >= MAX_DFRQ)
+            {
+                printf ("too many frequencies, exceeding MAX_DFRQ; redimension\n");
+                return;
+            }
         if (pfb[nf].stn[REF].find != pfb[nf].stn[REM].find)
             {
                                     // found matching channels with different freq id's