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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: OK! Hans. All right. Well, meanwhile my VFO is ready, the output waveform is available as a low impedant rectangular voltage. But i have to choose the caps for getting and covering the right frequency range. 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Hans. All right. Well, meanwhile my VFO is ready, the output waveform is available as a=20 low impedant rectangular voltage. But i have to choose the caps for=20 getting and covering the right frequency range. Yes, Roelof, VFO building is fun, like all that stuff. Thanks to all for the input! I like the Clapp oscillator. Here a picture of the D.U.T.:=20 https://dl.dropbox.com/u/19882028/MF/VFO%20under%20construction.jpg 73, Stefan/DK7FC Am 05.07.2012 22:44, schrieb hajo.brandt.dj1zb@t-online.de: > Dear Stefan, > > Yes. xtal 7,02 MHz will run stable, and xtal 6,5536 MHz must be pulled > down by 12,6 kHz to 6,5410 MHz. A coil in series to the crystal and th= e > tuning capacitor will do this, in its simpiest form by using a molded r= f > choke. > > Or 7,0200 MHz is adjusted for 7,0256 MHz, then 6,5536 Mhz will deliver = a > difference frequency of 472 kHz. And when 6,5536 MHz is pulled down to > 5.6466 MHz, the difference will be 479 kHz. > > OK? > > 73 Ha-Jo, DJ1ZB > > > "Stefan Sch=E4fer" schrieb: > =20 >> Hello Ha-Jo, >> >> Can you pull one of the xtals to cover the whole band? >> >> 73, Stefan >> >> Am 05.07.2012 20:57, schrieb hajo.brandt.dj1zb@t-online.de: >> =20 >>> Dear all, >>> >>> the only parts I have bought so far for MF (still beeing engaged in >>> other developments) are two crystals: 6,5536 MHz and 7,0200 MHz, to b= e >>> mixed with each other. The mixer is another bipolar transistor, and i= ts >>> emitter current is being keyed. A final source follower after the >>> low-pass filter will deliver the output to 50 ohms. >>> >>> The same solution I have also used on LF. >>> >>> 73 Ha-Jo, DJ1ZB >>> >>> >>> >>> =20 >> >> =20 > =20