Hi Hans, I have fried one BS170 in the UQRSS kit #1 (which by the way is still working well with V1.3) before I noticed my mistake, I now am using those sockets I cant remember what they are called they are like the arduino sockets but with a notch so you can break them off for the transistors.
I am not a programmer and have only just started with aurduino uno I have had a look at the sketch but cannot see where to change the frequency the callsign was easy, I take it I can add stuff like 73 and my locator or is there a limit to the size?
Thanks again for a great kit, I will let you know when I finished the UQRSS 2.
73 Colin.
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--- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:
Hi Colin
Thanks for the update, you are the first person to report having completed
the construction of the Arduino kit. Although you are also the only one to
have yet received it, as there is a gap in the shipping and the next
shipping date is 27'th May 2013!
Regarding the transistors - note that 2N7000's are used in the Arduino kit,
as in the earlier QRSS/Ultimate kits. You can use BS170, they are a more
powerful transistor apparently. If you do that though, you have to remember
to rotate them 180-degrees compared to the 2N7000, since the pinout is
reversed.
For more power you could put more transistors in parallel with Q3, though
there isn't board space for this, so you'd have to be creative. You could
also disconnect the +5V end of the FT37-43 and connect it to a higher PA
voltage. Put some heatsinks on Q3 for that. Just various ideas for
modifications, in case you are inclined! :-)
73 Hans G0UPL
On Sun, May 19, 2013 at 12:53 PM, dd5cf_colin <jobaco@...> wrote:
**
Hi to all members of the group,
I have just finished the QRSS Arduino shield for 40m, all went well the
instruction manual was a usual excellent and the PBC well made, I am only
able to get 50 mW output at 40m I can get 60mW but the transistor get too
hot, I am txing on ca 700645 Hz any reports would be appreciated:
jobaco@...
Vy 73 Colin DD5CF / G1ZOS
