AREF bypass capacitance on ATMega2560?

[Joerg]

Piotr Wyderski wrote:

rickman wrote:

When Piotr started talking about SDR he wasn't talking
about car radios anymore.

Yes, something more like this class stuff:

https://en.wikipedia.org/wiki/Joint_Tactical_Radio_System

That's a whole different ballgame. When it comes to spread spectrum,
high frequency agility and similar traits it has to be SDR. But for
those guys cost (and to some extent power consumption) is not a concern.
Because the taxpayer foots the bill.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[rickman]

On 9/14/2013 3:07 PM, Joerg wrote:

Piotr Wyderski wrote:
rickman wrote:

When Piotr started talking about SDR he wasn't talking
about car radios anymore.

Yes, something more like this class stuff:

https://en.wikipedia.org/wiki/Joint_Tactical_Radio_System


That's a whole different ballgame. When it comes to spread spectrum,
high frequency agility and similar traits it has to be SDR. But for
those guys cost (and to some extent power consumption) is not a concern.
Because the taxpayer foots the bill.

Funny that you mention that cost doesn't matter because the "taxpayer"
is footing the bill. I worked at a company making exactly those radios
and the engineering discussions would be about the safety of the
soldiers rather than "who cares, the tax payer is paying for it". The
very best performance is demanded because there are many times when the
mission depends on it including lives. But you are right in that cost
is not a primary factor.

There is waste. But mostly that comes from misdirected government
influences. In the case of these radios the government wanted to "save
money" by reusing designs in multiple platforms. But that usually meant
making the design more expensive to perform a wider mission with more
capabilities. In the end it was a massive effort that may have saved
some money or may well have cost more than it saved.

--

Rick

 

On Sun, 15 Sep 2013 02:26:44 -0400, rickman <gnuarm@gmail.com> wrote:

On 9/14/2013 3:07 PM, Joerg wrote:
Piotr Wyderski wrote:
rickman wrote:

When Piotr started talking about SDR he wasn't talking
about car radios anymore.

Yes, something more like this class stuff:

https://en.wikipedia.org/wiki/Joint_Tactical_Radio_System


That's a whole different ballgame. When it comes to spread spectrum,
high frequency agility and similar traits it has to be SDR. But for
those guys cost (and to some extent power consumption) is not a concern.
Because the taxpayer foots the bill.

Funny that you mention that cost doesn't matter because the "taxpayer"
is footing the bill. I worked at a company making exactly those radios
and the engineering discussions would be about the safety of the
soldiers rather than "who cares, the tax payer is paying for it". The
very best performance is demanded because there are many times when the
mission depends on it including lives. But you are right in that cost
is not a primary factor.

There is waste. But mostly that comes from misdirected government
influences. In the case of these radios the government wanted to "save
money" by reusing designs in multiple platforms. But that usually meant
making the design more expensive to perform a wider mission with more
capabilities. In the end it was a massive effort that may have saved
some money or may well have cost more than it saved.

Nonsense. There is waste from top to bottom, some incompetence, some
because cost just isn't an important parameter, and yes, some because
the whole idea is just dumb. Your admiration for the government's
forward thinking is cute, though.