Re: [Flexradio] Help - Hardware Guys
Thanks Ahti ... that's it ... I'll finish the modification that someone else started! With only a few days into this, I can see it is going to take a little while to catch up on the history. 73 de Kevin -Original Message- From: Ahti Aintila [mailto:[EMAIL PROTECTED] Sent: September 15, 2006 1:40 AM To: Kevin Hobbs Cc: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Help - Hardware Guys 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%20RF E%20Input%20Protection.pdf Good luck and 73, Ahti OH2RZ ___ FlexRadio mailing list FlexRadio@flex-radio.biz 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 FlexRadio@flex-radio.biz 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] Help - Hardware Guys
Hi All; Thanks for all the replies so far with ideas to help to get my receiver SDR running right. Tonight I had few more spare minutes, so I decided to tear it all apart and make sure all looked good after shipping. I found one curious concern. 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. The oscillator didn't seem to be seated all that well, but I am going to put the external ref in its place anyway before reassembly. 73 de Kevin VE3KH -- next part -- An HTML attachment was scrubbed... URL: /pipermail/flexradio_flex-radio.biz/attachments/20060914/508f1ccc/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz 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
Re: [Flexradio] Help - Hardware Guys
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 FlexRadio@flex-radio.biz 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 FlexRadio@flex-radio.biz 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
