[hpsdr] Hermes - parts changes for PCB builders

[Kjell Karlsen]

Just a few comments on some of the points:

2: On the pre-production boards it is difficult to replace C37 with LFCN  
80+. I´ll take a look at this when I am back home (May 20th).
On the boards that TAPR is going to deliver in the future, the layout will  
be for LFCN 80+.

6: The easiest way to install the two resistors are at J15 pin 1 and 8.

73, Kjell






På Sun, 13 May 2012 13:28:22 +0200, skrev Phil Harman <phil at pharman.org>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> For those building Hermes from bare PCBs please note the following  
> component changes:
>
> 1.  R37 = 470 ohms
> 2. C37 - replace with Minicircuits  LFCN 80+
> 3.  L28 = 4.7uH TDK part number SLF6045T-4R7N2R4-3PF, DigiKey part  
> number 445-4571-1-ND
> 4. R113 = 56k
> 5. Q3, Q4 = MMBT3906
> 6.  Add a 10k resistor to ground on U20 pins 6 & 7.
> 7. C13 - an alternative is  Digikey part no. SG2020CT-ND  which is  
> easier to tune and sturdier
>
> 73 Phil...VK6APH
>
>
>
>
>
>
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