Another Lucent cell site item appearing surplus is shown at: http://g4fre.com/lucent.htm
it seems to do simiar things to the RFTG-m-RB (10MHz osc, gps, 15MHz filter) but information is scarce Anyone any info/ideas? David Robinson > Message: 2 > Date: Tue, 9 Jan 2007 22:35:50 -0600 > From: "Bill Hawkins" <[EMAIL PROTECTED]> > Subject: [time-nuts] Some Lucent RFTG-m-RB data > To: "'Discussion of precise time and frequency measurement'" > <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="us-ascii" > > Received two of the subject units, one built in 96 and one in 97. > The dates are the first two numbers in the serial number. > > Took the 96 apart and learned that the LPRO-101 is not physically > connected to the main board, except through a pin connector. When > the unit is turned upside down, you can see a pattern of 6 screws > in two rows of three. These secure the LPRO. The rest of the screws > hold the main board. Do not turn the unit upside down but stand it > on its rear fins as you remove the screws. This keeps the LPRO from > dropping away and bending the pins. > > The LPRO has a thermal plate that provides good conductivity to the > case, so it can dissipate about 15 watts. There is no thermal goo > between the plate and the box, but the plate may be stuck to the box. > Put a screw in a hole and push on it to release the LPRO. Then, if > you have removed the 10 screws that hold the panel to the box, it > should all lift out easily, with the LPRO hanging by its connector. > I'd recommend laying the box down in its normal position and sliding > the innards out horizontally. > > Imagine my surprise when what I'd learned didn't work on the 97 box. > That assembly has a clamp that holds the LPRO in place, so pushing on > a screw doesn't work. There are four screws on the back, between the > fins. Loosen them to loosen the clamp, but don't remove them. > > Reassembled both - you don't want to run the LPRO without a heat sink. > The 97 unit drew 1.4 amps at 24 VDC at startup. The NO GPS and Fault > lights were lit. The current dropped to .7 amp but the Fault light was > still lit. Got 10 MHz at the J1 test point but nothing at the 10 MHz > output. Went away for an hour, came back to find the ON light, got 10 > MHz at J2, didn't check 15 MHz. The 96 unit had the same behavior, but > the 10 MHz was more accurate. The box got quite warm, but you could > keep your hand on it. (How's that for quantitative?) > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
