Charles, The Mini-Circuits part number SBL-1MH+ is a direct replacement to the CM1 in the Drake TR7. I have replaced several of those double balanced mixer modules and that one works perfectly. Ron / WB4HFN
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Charles Kaross Sent: Friday, April 23, 2010 7:20 AM To: [email protected] Subject: [Drakelist] TR-7 RX blown due to lapse of sanity In a moment of carelessness, I inadvertently transmitted into the RX input of my recently acquired TR-7 while testing the transmitter output last week. OK - I can hear the laughter now, and it is well deserved! So far I have determined: The rig had zero (or near zero) RF output when purchased - I will move this problem to the bottom of the list. The diodes in the CM-1 mixer module on the upconverter board are shorted - hopefully this the limit of the damage caused by my negligence. I cut open the CM-1 module with a Dremel, and the diode ring is a discrete part, encapuslated in what appears to be a ferrite bead, so the module will have to be replaced. I have ordered a MiniCircuits SRA-1 mixer from RF Parts, which I hope will be a direct replacement for the CM-1. I will post the results of my efforts to repair this rig to the list. Any comments, questions and or razzing is now being accepted .... Thanks, Charles K5QED
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