[hpsdr] Hermes Relay

[Phil Harman]

The snubbing diode is D1 on sheet one.  K1 is powered off  3P3VA so we don't 
have to bring the digital 3.3v line near the front end. I expect you  can 
guess how we found that out!

In which case one end of D1 should be returned to 3P3VA rather than 3P3VD. I 
see that we have it connected to 3P3VD on Mercury so perhaps best to leave 
as is.

Also pin  1 on U50 and U51 should be connected to ground.

L3 should be connected to 3P3VD.

Any more feedback before Tony starts the PCB layout?

73's Phil ....VK6APH





----- Original Message ----- 
From: <lstoskopf at cox.net>
To: <hpsdr at lists.openhpsdr.org>
Cc: <hpsdr-request at lists.openhpsdr.org>
Sent: Sunday, September 20, 2009 1:45 PM
Subject: Re: [hpsdr] Hermes Relay


> ***** High Performance Software Defined Radio Discussion List *****
>
> Just scanning Hermes' schematic.  I see the Attenuator RY doesn't have a 
> snubbing diode (reputed to possibly decrease relay life if on is 
> installed) and is connected AFTER L8 and directly to the LTC6400.  Assume 
> that all of the 100 nF caps will take care of inductive decay?  N0UU
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