> 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.