[hpsdr] Janus Alpha Construction

[Lyle Johnson]

Janus Alpha notes:

1) The optional 100K resistors at the DIN conenctor should be 0603. 
0805 won't fit.

2) The PCB footprint for the oscillator is too large.  It is possible to 
fit the oscillator by first putting blobs of solder on its four pads, 
then pre-tinning the four PCB pads, then carefully placing and 
soldering.  We should find a different oscillator (to match the PCB) 
and/or change the PCB layout in the next round.

3) Resistor values for the power supplies are incorrect, resulting in 
wrong voltages.

Corrected values are:

R21: change to 120 ohms.
R25: change to 866 ohms.
R34: change to 120 ohms.

4) Electrolytic capacitor footprints could use larger pads to make 
soldering easier.

5) I changed C27, C44 and C62 from 10 nF (0.01 uF) to 100 nF (0.1 uF).

***

Where's Ozy when you need him?

Enjoy!

73,

Lyle KK7P


 1149730670.0