[hpsdr] Mercury sensitivity problem

[Jose V. Gavila]

Hi Greg,

> Just make sure you check the soldering before changing the chip. The
> soldering is much more likely to be the problem.
>
> 73, Greg, ZL3IX

This amplifier gets pretty hot, almost the same than the A/D. Is this OK?

Soldering job, even with magnification, _seems_ OK. But I understand 
there could be some problem which is not visible even that way...

Regards,

JOSE

> On 2012-09-09 06:58 a.m., Jose V. Gavila wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi all,
>>
>> I have uploaded a video of the problem. Sorry, comments are in
>> Spanish, but it is easy to understand what happens if you read below.
>> It is at:
>>
>> http://jvgavila.com/hpsdr/samples/mercury_preamp_failure.mpg
>>
>> I start the unit and sensitivity is way down the right one. Then, I
>> apply cooling spray (you will hear the noise) to the Mercury preamp
>> and, suddenly, it comes to life. In short time, once it gets hot, it
>> fails again.
>>
>> I think I have a culprit :-)!
>>
>> Regards,
>>
>> JOSE
>
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-- 
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