[Ronja] Plastic bolt availability

Karel Kulhavy twibright at hispeed.ch
Fri Nov 7 08:46:50 GMT 2008


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?

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.
 
Karel




More information about the Ronja mailing list