Juan:
One difficulty in your suggested “little daughter board”
is that while the circuitry may not take much space, getting the cooling of
that PCB to the module baseplate may require much more volume and it is restrictive
as to where you place this daughter board. In the current design of the URx
that is one of the three areas needing the added heat sinks.
Dick Jansson, KD1K
From: [email protected]
[mailto:[email protected]] On Behalf Of Juan Rivera
Sent: Wednesday, 18 July, 2007 05.06
To: 'Jim Sanford'
Cc: 'David Smith'; 'Dave Black ((Work))'; 'Dave Black ((Home))'; 'Louis
McFadin'; 'AMSAT Eagle'; 'Samsonoff@Mac. Com'; 'Juan.Rivera ((Work))'
Subject: [eagle] Re: Jim's comments
(snip)
What if we just disable the CAN-Do module’s step-down
converter and create a small PCB that would attach to the 40-pin header and be
the home for the power supplies for whatever was in the other side of the
enclosure – in this case the receiver analog circuitry. The CAN-Do
module would get its power from that little board and so would the
receiver. In the case of this receiver we could put all the power
supplies on a PCB about the size of a large postage stamp.
1)
2)
Moves the 157 kHz receiver switching power supply to the separate
compartment in the front on that little daughter board and gets rid of that
spur in the passband
(snip)