Hi Bruce, these are very nice indeed. I used these conical inductors in our 2004 FireFox broad-band synthesizer prototype (working from DC to 1.64GHz), they are quite amazing.
But: * you need a microscope and a VERY stable hand to solder them down, and cut-off the unused wire. I damaged quite a few before I figured out how to solder them. And once soldered, they need to be physically protected because they are so extremely fragile * if I remember correctly they won't sell to everyone due to military applications (their main use) * their current handling capacity is limited * And they are very expensive. I ended up designing the FireFox with a series connected bias-t using a 120nH inductor in series to a 150 Ohm power resistor in series to a 2.2uH/270 Ohm resistor combination. That works very well up to over 1.6GHz, and costs pennies compared to $$. bye, Said In a message dated 10/8/2009 19:33:06 Pacific Daylight Time, [email protected] writes: For broadband use a powdered iron filled conical choke such as: http://www.piconics.com/BC/bc.pdf May be more useful, provided it is oriented correctly with respect to the microstrip transmission line. Bruce _______________________________________________ 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.
