[GreenKeys] Insect Spice Model

[Bob Camp]

Hi

I was actually a bit surprised at just how linear the poor thing was 
over a couple mili volts up to a couple hundred volts. I had thought 
that it would be a bit less predictable.

Of course until another one wanders into a set of contacts we'll never 
know how consistent they are.

	Take Care!

		Bob Camp
		KB8TQ


On Jun 21, 2004, at 2:59 PM, Henry Minsky wrote:

>
> I bet the resistance is non-linear. I'm guessing at 100 Amps, it would 
> either be zero or infinity...
>
>
> At 07:00 PM 6/19/2004, Bob Camp wrote:
>
>> Hi
>>
>> In the continuing quest to adequately model all the aspects of a 
>> conventional teleprinter loop we nave established a working model for 
>> another aspect of the loop. A common back yard ant crushed in a set 
>> of contacts runs about 6.5 K ohms at 240 volts. Capacitance and 
>> inductance is negligible. The model seems to hold for voltages down 
>> to the milivolt region and up at least to 330 volts peak (the limit 
>> of the measurement setup). While extensive modeling over frequency 
>> was not performed it is assumed that the model is valid at least up 
>> to a few tens of KHz (or tens of Kcps ...).
>>
>> Both wet and dry keying of the the loop were attempted with the ant 
>> in place and results were not encouraging. Further experimentation 
>> with contact enhancement in this manner are not anticipated unless 
>> our application for a federal grant comes through ....
>>
>>         Enjoy!
>>
>>                 Bob Camp
>>                 KB8TQ
>>
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>