Re: QRSS Arduino shield finished
|
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
|
