[OZAPRS] FW: Homebrew HF APRS transmitter

[Ray Wells]

I use my Etrex to check my speedo calibration.

Ray vk2tv

On 09/07/11 08:44, Shaun wrote:
> Now we just use a bunch of satellites whizzing around the globe with
> atomic clocks and passive receivers with intersecting sphere
> calculations and it is extremely accurate all things considered!
>
> Shaun
>
> On Sat, 2011-07-09 at 08:15 +1000, Ray Wells wrote:
>> And both methods fail to take into account the different rolling
>> distance of tyres with slightly different circumferences. A worn tyre
>> will return different results to a new tyre.
>>
>> I ran the circumference exercise a long time ago when buying 750x16
>> tyres for a G60 Nissan Patrol I once owned.
>>
>> Ray vk2tv
>>
>> On 09/07/11 07:49, Damien Gardner Jnr wrote:
>>> I can remember back to a day when I was still at uni, when my speedo died.. and instead of spending the money on a new speedo, I just marked off speeds in cencentric rings around my tacho, for each of the four gears :)   I seem to remember being pulled over for a breatho at one stage, and the copper noticing and asking about it...  And then spending 10 minutes extolling the virtues of a tacho vs a speedo, and how the tacho *has* to be more accurate, as it's a direct electrical drive from the distributor (and calibrated using a frequency counter), compared to the cable driving a revolving magnet, acting on a spring-loaded needle...   He walked away very confused :-p
>>>
>>> --DG
>>>
>>> On 08/07/2011, at 11:32 AM, Nic McLean wrote:
>>>
>>>> 3.375 degrees or 3 degrees 22 minutes and 30 seconds!
>>>>
>>>>
>>>> In fact, your assessment for today is to recalibrate a 270 degree, 80 mph
>>>> speedometer with 1mph divisions, into furlongs per fortnight(fpf). Use a
>>>> suitable scale and mark the speed limits at 30mph and 50 mph. what is the
>>>> subtended angle between each scale division?
>>>>
>>>>
>>>> 73 de Norm, VK3XCI
>>>> Mildura, Australia
>>>> The Wintersun City
>>>> QF15bt.
>>>>
>>>>
>>>>
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>>
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>
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