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: eagle-bounces@amsat.org [mailto:eagle-bounces@amsat.org] 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)
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