[hpsdr] Hermes/Anan 10 Drift?

[Lyle Johnson]

Or just solder down another 100 ohm SMT resistor on top of the present 
100 ohm, yielding 50 ohms and no removals.

73,

Lyle KK7P

>
> On Thu, Mar 14, 2013 at 3:12 PM, Mike Monnier <w8bac at comcast.net 
> <mailto:w8bac at comcast.net>> wrote:
>
>     "There was a bad value in the Schmidt-trigger squaring circuit for
>     the 10MHz reference input. R141, the emitter resistor of the
>     differential pair, has the wrong value. It should be 50?©, not
>     100?©. Change that an you won't have any problems with using your
>     external reference.? "
>     I see some odd type from time to time on this reflector. In your
>     post (cut and pasted above) you are talking about R 141. A
>     resistor I assume and it should be 50 ohm? Not 100 ohm? Is that
>     right?
>
>
> Yes, yes, and yes.
>
>     I am not able to replace an SMT component on a 5 layer board.
>
>
> Why not? Hot-air rework tools are pretty cheap now. This is what I used:
>
> http://www.circuitspecialists.com/csihotgun-2.html
>
> You can't go too far wrong for $89.
>
> Heat up the resistor with the hot-air rework tool; remove the resistor 
> with tweezers; use an iron and solder wick to get rid of that wicked, 
> nasty RoHS solder crap; put down a couple of dabs of good PbSn solder 
> paste; heat again with the hot-air tool; put it all back together; and 
> go play radio.

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