[hpsdr] Hermes BOM FL1 substituted by RLP-50+???

[Ian Guffick]

Hi Dave,

I think it's safe to assume the 'E' in e.g. 51E is a replacement for an ohm
symbol. It's probably been mangled due to differing fonts.
I've been working from the BOM, but there are a few differences between the
board and the BOM/schematic. For instance, C70 and C228/C229 (0603s) are
not on either the BOM or schematic.

BR,
Ian G7JXY.

On 2 November 2012 18:14, Dave <kdcarlso at gmail.com> wrote:

> Same issue. Do I trust the schematic or BoM?
> On the BoM spreadsheet line 66 & schematic says resistors are 22E which
> makes them 1.65M ohm. The part number indicates a 22 ohm resistor.
>
> Even worse is line 128 showing a value of 51E (3.32 M ohm) but the part
> number is for a 51 ohm resistor and the schematic shows a 50E (3.24M ohm)
> resistor.
>
> Can I trust the schematic to be accurate and just work from there?
>
> Dave
>
>
> On Nov 2, 2012, at 11:01 AM, Ian Guffick <iguffick at iee.org> wrote:
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Andrew,
>
> I've been trying to build from the BOM on the Apache Labs site, it has a
> few omissions and errors. It is not the BOM that has been used for the TAPR
> build. The BOM that TAPR used is obviously around somewhere, but I don't
> know where it is available, does anybody have a link?
>
> From pictures I've seen of the TAPR built boards, they have one each of
> RLP-40+ and RLP-50+.
> I think it would be wise to stick with the RLP-40+ (i.e. one of each).
>
> BR,
> Ian G7JXY.
>
> On 1 November 2012 21:08, Andrew <irbsurfing at yahoo.co.uk> wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>> Hi,
>> I see in the latest Hermes production BOM on the Apache Labs website, FL1
>> which was an RLP-40+ has been substituted for an RLP-50+.
>> The schematic still shows an RLP-40+.
>> Is the BOM correct?
>> This is not a very good move as it will degrade the Tx spurious.
>> Please can someone explain why this has been done?
>> Thanks,
>> Andrew
>> G4XZL
>>
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