[time-nuts] Some Lucent RFTG-m-RB data

[fre_eng at g4fre.com]

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" <bill at iaxs.net>
> Subject: [time-nuts] Some Lucent RFTG-m-RB data
> To: "'Discussion of precise time and frequency measurement'"
> 	<time-nuts at febo.com>
> Message-ID: <000c01c73470$ceae2810$0900a8c0 at cyrus>
> 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?) 
>