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Andrey Sviyazov andreysviyaz at gmail.comHi all! > As far as I understand, the IF frequency should be 360 MHz as the UmSEL > uses > > the TB0130A IF SAW filter. Its center frequency is 360 MHz. > Yes, IF freq can be 360MHz (TB0130A) or 400MHz (TB0448A), matching components there is for both variants (C32/C38, C46/C51). > > By the way, why do you say it would be a problem if IF was above 380 MHz > ? > > Because of interferences ? In this case, would it still be problem if we > > install the UmTRX + UmSEL boards inside an enclosure ? > > Well, the original question was from Harald, but the concern was with > interference, yes. > I thought about these well known problems like strong mirror (image) freq's with their interfer's, direct passthrough, LO-ANT emission and so on. So, month ago I made measures of RF SAW filter TA1003A (see pics here). Actually, I chose quite typical method - additional highpass filter (Z6 - HFCN-740+). I hope it can help to avoid most of those low-frequencies problems. It will be much better if Taiyo Yuden RF filters would be used (those filters also known as Fujitsu brand). > I think it depends on the type of enclosure we use. Andrey should be > able to comment here. > Yes, of course, tower-mounted enclosures should be not only IP65, but also EMI isolated. Best regards, Andrey Sviyazov. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120824/b688cfb7/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: TA1003_near_band.jpg Type: image/jpeg Size: 413664 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120824/b688cfb7/attachment.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: TA1003_wide_high.jpg Type: image/jpeg Size: 298537 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120824/b688cfb7/attachment-0001.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: TA1003_wide_low.jpg Type: image/jpeg Size: 282089 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120824/b688cfb7/attachment-0002.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: TA1003+HFCN740.jpg Type: image/jpeg Size: 307780 bytes Desc: not available URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20120824/b688cfb7/attachment-0003.jpg>