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
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(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
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