[Discuss-gnuradio] Re: WBX hardware problem

[Matt Ettus]

On 06/05/2010 02:53 AM, address@hidden wrote:
> Dear Matt,
>
> I have a hardware failure in the RX part of WBX: I wanted to use USRP/WBX to
> check the output of some LNA antenna amplifier, but presumably it was
> oscillating
> due to some defect and generated too much power to be bearable by the RX
> circuits of WBX.
>
> Now, the receiving in principle works, but with>=40 dB attenuation both
> on the RX/TX and RX2 inputs of WBX.
> Transmitting works fine, so I guess the RF switches are not affected and the
> problem might most probably be a burned MGA-6x563 LNA on the
> granddaughterboard,
> in the worse case some other RF component on the main WBX board.
>
> May I have a few questions:
> 1. is there a simple possibility to make sure the problem is localized on
> the granddaughterboard only?
> (e.g. connecting an antenna directly to the (from factory empty) SMA socket
> on the main WBX board)?

Maybe.  You can try it and see.

> 2. If so, would it be possible to order just replacement granddaughterboard?

Yes.  If you just need a gdb, contact me offline.

> 3. In the schematics the LNA on granddaughterboard is denoted MGA6x563.
>     Does it mean it does not matter exactly which one is used and Agilent
> MGA-61563
>     would be a good replacement?

It is a 62563, not a 61563, and it should be commonly available.

Matt