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#4
January 10th 07, 10:26 PM
posted to rec.radio.amateur.homebrew
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Electronic inductor bandswitching using ADF4360-8 VCO / PLL
wrote in message ups.com... I'm playing with a homebrewed receiver design and need a LO which covers 120 to 240 MHz. What's the feasibility of using something like the MAX4545 to electronically switch the ADF4360-8 VCO's inductors in order to cover that range? What other approaches are recommended for a homebrewed digitally controlled LO which covers that range? -- John ------------------------------------------------------------------------- | Feith Systems | Voice: 1-215-646-8000 | Email: | | John Wehle | Fax: 1-215-540-5495 | | ------------------------------------------------------------------------- (ADF4360 L's don't appear accessible?) Done a bog standard, single transistor Colpitts, that covers 110-220Mhz using a cheap SMV1255-000 varicap. It's part of a BFO arrangement and intentionally limited to a 110MHz swing (1.5 to 4.5V) but there's a bit of steam left in the Varicap and 120-240 seems not unreasonable. Present plan is to feed the VCO to a LMX2306 synth run as always, by a PIC. (BFO design started after rooting round for a now unobtanium /100 frequency count prescaler for another project and noticed the cheap LMX2306 can act as all things to all men ). john -- Posted via a free Usenet account from http://www.teranews.com |
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