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| Subject: | Re: LF: PA0RDT antenna near a TX? Front end OK? |
| From: | John Andrews <[email protected]> |
| Date: | Thu, 15 Oct 2015 13:14:31 -0400 |
| In-reply-to: | <D7C6DA4CB2A44BD7BCAA6CA222B95DDB@MichaelSappPC> |
| References: | <[email protected]> <[email protected]> <A1F434BCA1554D73B62CD8C5DA92018C@MichaelSappPC> <[email protected]> <D7C6DA4CB2A44BD7BCAA6CA222B95DDB@MichaelSappPC> |
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One trick that I have used on several preamps:Put a small PC-mount relay (such as those used on telephone lines) at the front end of the preamp. Connect the relay coil to the preamp power feed. Wire the relay to short the input using the normally-closed connections (i.e., powered off). Then route the preamp power through your T/R switching in the shack. This protects well against RF-swamping and nearby lightning hits. The down-side is that you have to supply the current to run the relay. German ops who hang such electronics in distant tree-tops would probably not be interested. John, W1TAG |
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