GW3UEP

 

472 kHz VFO

475 Xtal    1W QTX PA    25W QTX PA    100W QTX PA

 

 

Notes:

L1: coil lacquered, then hot-glued in place ~4mm above ground-plane & clear of metalwork.

Tune capacitor alternative: 30pF B-hive - see 501-504kHz CMOS VFO & GW4HXO B-Hive VFO

 Dielectric info: NPO ceramic.  N150 ceramic or polystyrene.  C1: 148pF total.  N150 range  68-82pF.

Hardware: brass screws/fixings [non-ferrous] used in vicinity of toroid [affected by magnetised materials].

 


 

 

 

 

Temperature Test Chamber

GW3UEP

 

15/4/12

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