[OZAPRS] FW: Homebrew HF APRS transmitter

[Ray Wells]

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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