> It appears that the 10mHz output from the > Trimble (+12.5dBm) is a little hot for the Flex, which wants to see > *<*+10dBm. > I've been told that the simplest, cheapest way to tame the Trimble is to > insert a splitter in the output, put a 75 ohm terminator on one side and > connect the other side to the Flex.
The Flex wants 0 to +10 max on the reference port, per the manual. Using a two way splitter between the Thunderbolt and the F5K drops the level about 3 dB, which is still close to the upper limit for the F5K. A better "losser" is a three or four way splitter. These will lose more power than the two way splitter. Using the terminators on the unused ports of the splitter is optional if there is nothing connected to the unused ports. If you were using the splitters to feed long lengths of coax cable from the splitter ports. than you would need to terminate the far end of the cables to prevent reflections which could change the splitter's loss, or, in the case of NTSC TV signals, cause severe ghosting in the picture. Or you could use an in-line 6 or 10 dB coax attenuator. 73, Ralph W5JGV - WD2XSH/7 _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
