[Hackrf-dev] I lost the pre-amp on the HackRF. How to get it back ?

[scateu]

You may need something named ‘hot air gun’, (热风枪 in Chinese), which heats the whole component at one time, then you can replace it.

You can find it on the assembly document. 

    https://github.com/mossmann/hackrf/raw/master/doc/hardware/hackrf-one-assembly.pdf

There are two amplifier, one for TX, one for RX.

TX: 
    
    U25;MGA-81563;Avago;MGA-81563-TR1G;0.1-6 GHz 3 V, 14 dBm Amplifier;;;;;

RX: 

    U13;MGA-81563;Avago;MGA-81563-TR1G;0.1-6 GHz 3 V, 14 dBm Amplifier;;;;;

在 2014年8月26日，下午10:05，Guan Yang <guan at yang.dk> 写道：

> On Mon, Aug 25, 2014, at 21:14, scateu wrote:
>> The preamp is electrostatic sensitive device. It seems to be broken
>> easily. 
>> 
>> I had to replace it with soldering iron.
>> 
>> I think the other reason maybe transmitting while antenna port connects
>> nothing, the reflection of RF signal breakdown the MGA-81563 preamp.
> 
> My preamp might be broken too. When I check with a broadcast FM station,
> it goes from -24dBFS without preamp to -36dBFS with preamp. (Identical
> IF and BB gain settings.) I don't have any weak signals I know well to
> test with, but my local NOAA broadcast station can be received without
> preamp and I can't hear it with preamp.
> 
> Are there instructions for replacing it somewhere, including a photo of
> where it's located? Is Digi-Key part 516-1586-1-ND the correct part?
> 
> I'm not very good at de-soldering. What's the best way? I'm thinking
> that maybe I can cut the legs on the existing part, and then de-solder
> each leg separately.
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