My Iler 20 is finally taking shape . The IF has changed to 4.000 MHz and the vxo has 10.250 MHz cristals.(Ebay) The VXO coil now holds 64 turns no.26 (0.31mm) magnet wire and the tuning range with the polyvaricon is 14.180 - 14.248 MHz . 5 Capacitors of 10 pF now serve in the 4 MHz cristal filter.
But the cabinet was not fit for the field for it had toomany switches and knobs...
This is a better choise :
As you can see, even the mike was to bulky and was replaced by a home made model.
Audio now sounds verry good and the rf power is 6 Watts PEP at 13.8V. In order to lift the microphone input R6 was changed to 470K The counter comes from Hendricks QRP. and the cabinet was ordered from Qrp Project in Berlin http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Kuehlr168x110x54 It fits the board like a glove . For smooth tuning a 1:10 ball drive is added .
The latest boards have a litle bug causing a shortcut to ground of C37 and R22 .This prevents the noisefilter from doing his job and could create audio distortion . Before installing C37 take a 3 mm drill and make a smal cone in the board surface to remove the ground connection .
I noticed that the noise filter even causes the noise levell to rise , so i desided to remove C37 and R22 permanently.
More info about this nice kit : http://ea3gcy.blogspot.nl/