[McHUG] Real cheap GPS - was Chart with spaces

[n3sb at qis.net]

Hi Pete;

Don't forget that Sparkfun's Free Day is January 7. That'll make GPS  
modules cheap enough to fly on a PICetSAT mission.

73; Steve, N3SB
Happy Holidays!!


Quoting Peter Morton <mortonph at comcast.net>:

> Rich-
>
> To carry your simulation to the next level!!!
>
> LTSpice should allow you to run the simulation at different temperatures.
> The voltage across the diode has a 2 mV per deg. C. negative temperature
> coefficient.  This will affect the voltage measurement accuracy a bit as the
> balloon rises and the electronics cool.  The temperature sensor is outside
> and the 1N914 is inside the insulated package (the styrofoam cup) so there
> will be a longer thermal time lag time at the 1N914.
>
> Something else to mull over is that the PicAxe is only rated to 3V, so, does
> anyone know how well the ADC in the PicAxe behaves below 3V?
>
> But, I'm sure you'll have enough information with what you have to know when
> the voltage is marginal.
>
> I'm just another engineer throwing darts!!  Good luck.
>
> I just bought a Yaesu FT-897 (eBay) Transceiver that has all-modes from 1.8
> through 450 MHz.  So, I'm looking forward to the next launch so I can copy
> your data on a laptop while mobile.  I suppose an antenna like your
> hand-held yagi mounted on a tripod would be neat to have, also.
>
> I wish the GPS modules were a bit cheaper.  Futurlec has them for less that
> $40.  Too expensive to risk losing on a balloon flight per my pocketbook.
>
> -Pete, W3GVX
>
> ----- Original Message -----
> From: "Rich Mitchell" <geobra at att.net>
> To: "McHUG Reflector" <mchug at mailman.qth.net>
> Sent: Wednesday, December 23, 2009 11:57 AM
> Subject: [McHUG] Chart with spaces
>
>
>> This may read better:
>>
>> Voltage     R2 Vdev      R2 %       D1 Vdev        D1 %
>> 5              1.59864       31.97%    0.547757      10.96%
>> 4              1.27891       31.97%    0.536324      13.41%
>> 3              0.959184     31.97%    0.521111      17.37%
>> 2              0.639456     31.97%    0.49834        24.92%
>> 1              0.319728     31.97%    0.45256        45.26%
>>
>> --
>> McHUG - Physical Computing ;)
>> MicroController Ham User Group
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