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On a sunny day (Sat, 21 Feb 2004 19:22:15 +0000) it happened Paul Burridge
wrote in : On Sat, 21 Feb 2004 18:22:44 +0000, Leon Heller wrote: Paul Burridge wrote: Anyone care to nominate an RF mixer chip for 100Mhz that's readily available in the UK? What sort of performance is required? "Good." :-) Diode mixers are easy to obtain and have good IMD characteristics. The impedances on the ports need to be properly matched. What - the sort of crossed diode config one often sees in the ham design books? Do you think I might as well just make one up from discretes? I'm basically just trying to combine 60Mhz with 20Mhz to end up with the difference frequency in this case. JJ suggested a chip, but looking at the data sheet, it seemed to be designed more as a modulator than a mixer. Let's not get into an argument over semantics but y'all know what I mean, I'm sure. BTW, thanks for a good steer with the Pulsonix suggestion, Leon. I'm making good progress getting to grips with it. I do this with a dual gate MOSFET, osc on second gate, signal on first. A voltage divider on gate 2 to set it in teh non-linear part. This works very well, is not critical, very cheap and extremely reliable. Also the noise figure is good. So tuned 40MHz in drain I did one some weeks agao, but cant remember what that was for? Anyway that sceme works up to a GHz , from kHz up. If you need diagram and part example I could draw up one here. Copyright Jan Panteltje 2004 All Right Reserved By reading this you agree to pay me 1 fc. |
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