Quote from: amix on April 06, 2014, 04:26:10 PM

Quote from: nemercry on April 06, 2014, 11:56:47 AM

Quote from: smracer on April 05, 2014, 12:57:48 AM

I bought these.

Yageo 47.5K ohm 100ppm SMD (Surface Mount) Thick Film Resistor 0402 1% 1/16W RC0402F (Continuous strip of 500)

I have modded 3 GS's so far and they are running fine at 1150Mhz for 4 hours.

I need to get a better magnifying glass to do the rest of these. It's like soldering a grain of sand. Are these OK to use? Is 1/16 ok?

http://i.imgur.com/u8M5Y8K.jpg

Good work sir!

The resistor will work fine.

@Amix:
The idea behind the 47kOhm 1 % resistors was that we wanted to have same results for all of our modded units.
With 47kOhm 5% resistors we had the problems with bad units not operating good at 1150mhz. Due to high variance in ashresistors base resistor value.

yeah i see your point and agree with you. i checked mine before hand to check the variance on them. .2 so it was in line wiht a 1% resistor anyway. but yes as a control 1% is better. 1% is better full stop i was just saying 5% will do as long as your aware of the variance and its potentail for impact - better or worse.

Quote from: simon66 on April 05, 2014, 10:09:13 PM

Quote from: volum4 on April 05, 2014, 08:39:39 PM

Quote from: amix on April 05, 2014, 04:59:28 AM

Instead of usig a solidering iron i highly suggest getting access to a hot air station. i soldered smd before but never this small.
Hats off to ANYONE soldering these, thats serious skill. im using my hot air station on them

May i ask what's the safe temperature setting when soldering these using hot air station? I plan to use hot air station as well but i'm not so experienced on this stuff yet..

You wanna use Kapton tape to cover the SMT units and just leave the exposed area. Kapton tape it's a heat resistant tape, so its perfect for hot air solder. Use experiment on a dummy board before using it on your GDS units.

Tape?! Blown Away?!!! Hot powerfull a rework kit do you have? industrial?. Mine never even twitched at blower set to just under half power. the heat was set at about 200 c. i had the preheater plate on underneath so probably didnt need to be as high as 200. apply the flux will stick it in place, wiht some solder paste if you have it.
The temputure you use will vary, depending on the size of the nozel your using, how far from the smd the hot air blower is, the force of the air, these can all affect the temperture reaching the smd. I couldve connected up my temperture probe to check the surface temputre of the smd, but i had the soldering iron connected up so didnt - inconvience that its one or other (temperture probe or soldering iron. yes just been a bit lazy. next time ill stick the probe on to check the surface temperture when it goes.

got a few more to do but i not had time what wiht work and home.

i think it can be blowed away for sure if you use wrong size nozzle and apply too much air flow. specially cheapo stations may have problems on regulating air flow precisely. using a tape is a very good idea! just to be sure that something unnecessary isn't blowing away..

volum4

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