Tony, I happen to have a GR300 repeater open on the bench. The fan in this unit is a Nidec Beta V device carrying several part numbers: TA450DC, B33211-63A, and 93014 MOT. It is rated at 12 VDC and 0.49 A.
Curiously, none of the above part numbers are listed on MOL, and the GR300 service manual does not list the fan as a replacement part. Of major significance is the fact that the fan has been modified by Motorola to include a thermistor to sense the heat-sink temperature of the transmit radio. Although the fan was sitting in a cool environment, it ran at full speed when I applied 12 VDC to its power plug. Maybe there's a problem in this fan circuit! I think you should be able to replace the existing fan with a good-quality, low-EMI unit from Panasonic that runs at a very low speed. Otherwise, install a simple thermal switch on the transmit radio's heat sink to control the fan. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Tony L. Sent: Tuesday, November 13, 2007 8:44 AM To: [email protected] Subject: [Norton AntiSpam] [Repeater-Builder] GR300 Repeater Housing - Fan Replacement Has anyone here ever replaced a fan in a GR300 repeater housing? If so, how tough of a job is it, and is the fan stock? Thanks.
