[hpsdr] Any difference between Apache and TAPR built Hermes boards?

[Helmut]

Hi,

can anybody please tell me why in the TX path of Hermes a 40MHz LPF (RLP40+)
is used, while a 50 MHz (RLP50+) is provided in the RX path. Approx. 1 dB
more of insertion loss on 6m could explain a portion of the 3 dB decline of
output power between 10m and 6m band.

73, Helmut, DC6NY

  

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Dick Faust
Gesendet: Montag, 10. März 2014 17:56
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Any difference between Apache and TAPR built Hermes
boards?

***** High Performance Software Defined Radio Discussion List *****

The Schematics are identical but the parts that are included are 
different. If you look on my Hermes page, you will find large format 
pictures of both TAPR build and Apache.
http://www.k9ivb.net/hermes/
The most significant differences are those parts associated with Anan10 
and J15 on the Apache board.  The TAPR board is set up for Apollo and 
most of those differences can be seen on the bottom view of the TAPR on 
my web page. The parts on the bottom are not included on the Apache 
version and K15 is not included.  TAPR also has never released an "as 
built BOM" for comparison.

Dick K9IVB

On 3/10/2014 5:43 AM, Chris Wilson wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
>    10/03/2014 12:42
>
> Is there any electronic or physical difference between TAPR produced
> and built Hermes boards and those from Apache Labs? If so, what?
> Thanks.
>

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