Good Morning Marty, Unlike typical digital and analog circuit card assemblies, Rf CCAs require tweaking and fine tuning especially with solder joint geometries. Rf does not like bulbous or concave joints -- the preference is to go back in time and look at the old Mil specs/stds which describe the desired connection "the soldered connections shall be of a smooth metallic luster, no excess solder, globules, peaks and the angle formed by the solder to the basis metal at the periphery and intersecting points of the solder shall be no greater than 60 degrees". The acceptance criteria contained in J-STD-001 and IPC-A-610 is not acceptable for some Rf applications -- my experience is that supplementation of these requirements is necessary. I suggest you look at the geometry of the "as received" product and compare that to the "in-house reworked" geometries. One thought is with the suspect Xceiver having bottom only terminations -- does this pose a reflow challenge that your supplier hasn't overcome? Another thought with the Xceiver -- what are the metallized terminations and surface platings? Steve Sauer Manufacturing Engineer Xetron Corporation Cincinnati, OH -----Original Message----- We are experiencing a concerning variation from board to board in the performance of our RF product. We have investigated several causes of the problem and are currently of the opinion that soldering quality of the transceiver chip is the most significant contributing factor. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------