EMRFD Message Archive 11476
Message Date From Subject 11476 2015-08-10 08:58:19 Rod R.E +60 dBm IP3 - forgot to mention, 12 volt system Please pardon the extra posts:
The +60 dBm IP3 device will be in a 12 volt environment.
11484 2015-08-10 10:55:34 Ashhar Farhan Re: R.E +60 dBm IP3 - forgot to mention, 12 volt system the RD16HHF01 that i used exhibited 40 db IMDR at 4 watts. This already puts it in the 56dbm output intercept. i suspect that this can be even higher but for the driver chain. the circuit is in the emrfd's pictures at https://groups.yahoo.com/neo/groups/emrfd/photos/albums/646547507- f 11487 2015-08-10 18:32:07 kb1gmx Re: R.E +60 dBm IP3 - forgot to mention, 12 volt system Looked at the picture...I hope this is a drawing error. The gate of the RD16 is not returned to a bias source or ground.When I've actually made that error it either worked and sometimes not or crowbars the power supply.Allison 11488 2015-08-10 20:32:48 Ashhar Farhan Re: R.E +60 dBm IP3 - forgot to mention, 12 volt system oh, yeah i didn't capture that one. the bias is supplied through a 10k resistor reading off a pot that goes from 0-5v, regulated and bypassed at RF and AF.- f 11490 2015-08-11 06:01:24 bobtbobbo Re: R.E +60 dBm IP3 - forgot to mention, 12 volt system What bias current do you have your RD16HHF01 set for in this circuit, Ashhar?
11491 2015-08-11 07:53:30 firstname.lastname@example.org... Re: R.E +60 dBm IP3 - forgot to mention, 12 volt system
i used 600 ma. the critical stage is the driver. if you have cascade.exe from th3 EMRFD then play with it by simulating a power chain.