In a message dated 07/10/2009 08:17:32 GMT Daylight Time, [email protected] writes:
Oops. It has been a long time since I read the manual for the Spectracom 8140, or used it. I forgot that the rear outputs are fixed at 10MHz and only the single front output changes with the push buttons. You re-learn something every day :-) --------------------- Morning Joe Don't forget either that the 8140 as supplied has a DC supply for the line taps superimposed on the rear panel sinusoidal outputs. However, the A4 distribution amp/output PCB was also used in several other Spectracom products, including the 8130 and 8164, with component identification always remaining the same, as far as I can tell anyway, but with link placement and filter values changing to suit the application. If you compare, for example, the A4 schematics from the 8140 and 8164 manuals you will see that removing the DC bias is quite straightfoward. It would also be straightforward to set the divider output links on the 8140 A4 as per the 8164 A4 to provide the four different sinusoidal output frequencies to the rear panel although three of the four output filters would also need to be modified to suit the changed frequencies. The good news is that all the required component values are also in the 8164 manual:-) I assume you have the 8140 manual but if not it's available for download from the Spectracom site, a simple registration is required, or I've uploaded both for anyone that might be interested..... _http://rapidshare.com/files/289729072/Spectracom_8140_2v1_0594.pdf_ (http://rapidshare.com/files/289729072/Spectracom_8140_2v1_0594.pdf) _http://rapidshare.com/files/289730121/Spectracom_8164_3v1_0893.pdf_ (http://rapidshare.com/files/289730121/Spectracom_8164_3v1_0893.pdf) regards Nigel GM8PZR _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
