Its size and location in the RF path suggests that it is an optional preselector. It should have five adjustment screws with locknuts, and bear the designation TFD1011 or TFD1012.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wb5oxq Sent: Sunday, September 05, 2010 8:11 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Unidentified part in msf5000 vhf station I just aquired a second msf5000 to make a 2 meter repeater our of and it has a part not present in the first station. I suspect it could be a rx preamp due to the fact it has coax input and output and it is wired in series between the duplexer rx port and the receiver rf input. It appears to be an aluminum block rack mounted just below the power supply and is about 1.5" thick and about 8 or 9 inches wide. I did not see any electrical connections so if it is a preamp it must get power from the coax into the receiver. I am not familiar with this device. My other station did not have this part. Perhapps it is sopme kind of filter? Both stations are the digital capable models which I program with the rib and old laptop. Any ideas please! Pictures on request if needed.
