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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Receiver protection |
| From: | DK7FC <[email protected]> |
| Date: | Tue, 10 Jul 2018 14:27:54 +0200 |
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Hi Paul, It strongly depends on how your front end is designed. Am 10.07.2018 14:04, schrieb N1BUG: I don't think so. They work until several 100 MHz so they are extremely fast. Further you can switch a small R (depending on the design) in front of the diodes. This also builds a RC lowpass which can help to rise the performance.Now I have a pair of back to back 1N4148 diodes across the receiver front end but I don't think this offers real protection because they allow too high voltage before conducting. I'm also using 1N4148 diodes but not back to back, rather one against ground, the other against +, while the center is at V/2. How? The output voltage of the preamp can't be higher than the supply voltage.Also there is a preamp after the didoes which can bring the RF to dangerous levels! 73, Stefan |
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