[time-nuts] Adding 10Mhz to Lucent RFTGm XO GPSDO

[Charles Osborne]

Skip, others,

I have the RFTGm-II-Rb and RFTGm-II-XO redundant pair working at 10 MHz on 
the main outputs. Its been six or eight years, so I don't remember all the 
details and don't want to take the system offline to refresh my memory right 
now since its working well. But as I recall I took the 15 MHz bandpass 
filter out of line and jumpered across. The buffer amp in the unit then 
produces a nice low distortion 10 MHz sine wave out at about +23 dBm to feed 
the splitter. The unit I have also has the TNC 10 MHz passive splitters 
which then put out +9 dBm per port.

So it must have had a divide by 2 and x3 multiplier (or mixer with the 10 
MHz) function to get from the LPRO Rubidium's 10 MHz output or the 10 MHz 
OCXO in the other unit in order to get 15 MHz. But poking around in the 
circuitry associated with that 15 MHz bandpass filter / buffer amp and 
bypassing the 15 MHz filter should result in a good high level sine wave 
10MHz output on each unit.

73,
Charles, K4CSO

----- Original Message ----- 
From: "Skip Withrow" <skip.withrow at gmail.com>
To: <time-nuts at febo.com>
Sent: Wednesday, January 16, 2013 10:45 AM
Subject: [time-nuts] Adding 10Mhz to Lucent RFTGm XO GPSDO


> Hello nuts,
>
> I have added a 10MHz output to the Lucent GPSDO several times over the 
> last
> several years, and have finally documented the modification.  I'm throwing
> it out to the public domain for all nuts to enjoy.  If there are any
> changes that should be made please let me know.
>
> I have uploaded a MS-Word document to KO4BB's manual site (it should be
> under recent uploads).  Or, you can access it from the following link
> - http://207.224.127.233/RFTGm/Lucent
> RFTGm Modification.doc .
>
> Enjoy,
> Skip Withrow
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