[Ronja] Plastic bolt availability
Bruce M Simpson
bms at incunabulum.net
Fri Nov 7 22:40:31 GMT 2008
Karel Kulhavy wrote:
> Hello
>
> I have created a special coil for Ronja RX which improves the range. It's made of
> 3 M5x40 plastic screws, cable ties and 0.3mm diameter enamel copper wire. Are M5x40 or longer plastic screws available at your place?
>
http://uk.farnell.com/allthread/306-2685/screw-kit-cheese-head-m5-sizes/dp/3062685
is this it?
this chap seems to have M5x40 as Nylon under model fixings:
http://www.modelfixings.co.uk/nylon_screws.htm
various 0.2mm copper wire available on farnell...
> The coil is wonderful has 2.63uH and 1.26pF, always the same, because they are
> defined by the exact geometry of the thread. It gives 5dB more gain compared to Bourns
> coil 1.5uH/0-3.45pf and doesn't suffer from Barkhausen noise!
>
> In case these M5 are not available worldwide someone will have to buy a bag and send them with TX diodes or RX PCB's.
>
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