EMRFD Message Archive 1289

Message	Date	From	Subject
1289	2008-01-02 10:26:10	Ed Almos	Substitution of MRF586 In High IP3 Front End
Dear All I have a design for a high IP3 front end but this uses the MRF586 which is now difficult to obtain. Would a 2N3866 be a suitable alternative or can anyone suggest a better (modern) device? Edward Almos HA6SST
1290	2008-01-02 16:34:48	Allison Parent	Re: Substitution of MRF586 In High IP3 Front End
1291	2008-01-02 16:51:34	Johan H. Bodin	Re: Substitution of MRF586 In High IP3 Front End
Ed, BFW16A may be a good choice. It is often used as a "european replacement" for 2N5109 in low distortion amplifiers for HF. 73 Johan SM6LKM Ed Almos skrev: > Dear All > > I have a design for a high IP3 front end but this uses the MRF586 > which is now difficult to obtain. Would a 2N3866 be a suitable > alternative or can anyone suggest a better (modern) device? > > Edward Almos HA6SST
1292	2008-01-02 16:51:44	bobtbobbo	Re: Substitution of MRF586 In High IP3 Front End
I have had excellent results in two different receiver designs using the Analog Devices AD831. The data sheet shows an IP3 of +24 dBm with -10 dBm LO drive. I have found an LO drive of -35 dBm to be optimum in my designs, virtually eliminating birdies. I don't have a lot of expensive test equipment to get numerical data, but I A/B my receivers against my PRO III, switching the antenna between the two. I find that all characteristics (to my ears) of any signal are exactly the same between the two. If I can just barely discern a signal on the PRO III, then I can just barely discern the same signal