WB6BNQ wrote: > Hi Jose, > > If you trace out the power feed (the bottom direction from the coax > connection) it supplies the transistor (most likely a MMIC) and the black 6 > legged active device (no idea on it). The silver square looks like a filter > device of some sort between what you call the transistor and the 6 legged > active device. The silver square has no voltage going to it. > > The 30 milliamps does not sound out of range to me, but then I have no > experience with the hp system. What makes you think it is the antenna that > is the problem ? If the voltages appear to be about right (your > statement) my guess would be that the antenna might be working correctly. > > So I would not be shorting anything out without getting a lot more > information first. Is there anyone else in your area that has such a system > that you could compare with ? > > Good luck, > > 73....Bill....WB6BNQ > > Jose Manuel wrote: > > Actually the 4 leaded input device is more likely to be a depletion mode FET (not Si but GaAs, or other III-V semiconductor) with the gate connected to ground via the . The 2 wide leads are both source connections.
The 6 leaded device is likely to be a MMIC. Try an old HP semiconductor (or an Avago) catalog for likely candidates. 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.
