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I think the PIN diodes are just fine for the job. but the
reverse bias needs to be used, it think. Mini circuits filter chips are really only designed for very very slow rolloffs- you cannot get miracles in a 1206 package I'd recommend a 3 section helical filter from Temwell- off the shelf and about $12-$20. I use them in all my commercial equipment.. Or a BPF built with say T25 size toroids, 3 section would be enough ... Just relax the filter you had in LT spice, so that the coupling caps come up to around 2-3 pF and then see what it all looks like. The LNA/switches offered by most vendors are only characterised 800-2700 but may be worth while looking at 2m... g On 15/04/2015 4:37 AM, Shane Burrell
wrote:
-- - Glen English RF Communications and Electronics Engineer CORTEX RF & Pacific Media Technologies Pty Ltd ABN 40 075 532 008 PO Box 5231 Lyneham ACT 2602, Australia. au mobile : +61 (0)418 975077 |
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