[Elecraft] K2 - signal loss in band-pass filter

[Kurt Pawlikowski]

Are, Et Al,

    JAT: It could be that the act of removing/reseating the MC1350 fixed 
the problem. Sometimes sockets "don't"!

    Regards,

    kurtt

    Kurt Pawlikowski, AKA WB9FMC
    The Pinrod Corporation
    kurtt at pinrod.com
    (773) 284-9500
    http://pinrod.com

Are LB3SA wrote:
> It was actually one of your earlier posts (thanks!) that prompted me to
> inject the IF signal before and after the IF Amp. At that point I had pulled
> out lot of hair and lost sleep over a low sensitivity K2.
>
> As to when the solder bridge got there... I'm not 100% certain that a bridge
> was the problem. But after I realized that the IF Amp was not amplifying I
> went over the solder points around the chip (I actually removed the chip and
> installed it again). The radio then started to work. It was actually a bit
> of a surprise since I never saw the problem - especially since I looked very
> closely at all the points through an amplifying glass many times before AND
> since all the voltages at MC1350 measured at specs while I had the problem.
> It was just the IF signal that wasn't amplifying leading me to at first
> think that the chip itself was defect.
>
> I only assume it was a solder bridge. And if that's the case it was probably
> made by me.
>
> Are - LB3SA
>
>
>
> TF3KX wrote:
>   
>> Just out of curiosity...
>>
>> Where was that solder bridge on the MC1350?  Was it already on the SMD
>> assembly when you received it, or was it something you caused by your
>> soldering?
>>
>> The reason I ask is that I had a problem with my SMD MC1350, never found
>> out what caused it, and just replaced it.  If there is something there to
>> watch out for, it may help others...
>>
>> 73 - Kristinn, TF3KX
>>
>>     
>
>