_____ Da: Carlo Bianconi [mailto:[email protected]] Inviato: lunedì 19 luglio 2010 18.11 A: '[email protected]' Oggetto: I: XV144 _____ Da: Carlo Bianconi [mailto:[email protected]] Inviato: lunedì 19 luglio 2010 12.15 A: '[email protected]' Oggetto: XV144 Hi folks, Ive just assembled my first XV-144 and it works fine, but it lacks the possibility of setting the local oscillator to an exact frequency. This is not a problem with K2 or K3, both have the offset correction, but from the moment that this transverter can be used also with any other rig, this is an annoyng matter. I think that this issue can limit the use of this nice piece from the OMs . Nobody likes to do cumbersome additions or subtractions to calculate the exact frequency; the idea is to tune the rig at 28.300 and transmit at 144.300. Most of the Japanese rigs cant correct internally the IF offset. Usually, all transveters, German or Japanese made, have internal trimmer to bring the O.L to the exact frequency. By the way, this transveter was out of frequency of 11.5 KHz, too much also for the K3, that has a +/- 10 KHz offset correction. Twiddling and fiddling with the oscillator, I discovered that the type of xtal employed is not sensitive to added capacitors, but is very sensitive to an inductance placed in series with it. The inductor I used comes to the junk box and I dont know the inductance. But with this little coil I can adjust the xtal frequency to exactly 116.000 MHz. In the pcb there is room for the inductor, so the mod is really easy to implement. I think that this few cents mod should be added to all XV144, so they can be used with any non Elecraft rig. 73 de Carlo Bianconi IK4ISQ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
