On 15/09/06, Kevin Hobbs <[EMAIL PROTECTED]> wrote: > On > the SDR-1000RFE v1.4 PCB, I found 2 diodes attached to a trace between K14 > and C47 . the other end of both diodes go thru the PCB near T2, but they > aren't soldered top or bottom . the PCB bottom solder mask has been scraped > away where the diode leads thru to the bottom, but no solder. Is this a > factory thing or a mod / upgrade that the previous owner got part way thru? > I do not see these diodes in the RFE schematic? I assume soldering them in > is a good idea? I doubt this is the problem I was looking, but who knows.
Kevin, It seems to me that the previous owner has not done the modification properly. The diodes before the RX preamplifier should clip any high voltage spikes before they damage the sensitive amplifier. See the Engineering Change Order (ECO-001): <http://www.flex-radio.com/Download/Hardware%20Documentation/ECO/ECO001%20RFE%20Input%20Protection.pdf> Good luck and 73, Ahti OH2RZ > _______________________________________________ > FlexRadio mailing list > [email protected] > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Homepage: http://www.flex-radio.com > _______________________________________________ FlexRadio mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
