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| To: | [email protected] |
|---|---|
| Subject: | LF: Re: VE7TIL TX Loop tests continue............. |
| From: | Bill de Carle <[email protected]> |
| Date: | Fri, 03 Sep 2010 15:06:40 -0400 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <[email protected]> <03CB7191C69D4F29AA7D6E5E4AB10D62@JimPC> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
At 09:58 AM 9/3/2010, I wrote: [..]One idea I am kicking around is to pass the 50-ohm signal at the antenna connector through the centre of a toroid with a lot of turns on the secondary - enough that we see millivolts instead of microvolts. Then I would do the clipping on the hi-Z side using a couple of fast op-amps with a variable threshold setting, hoping the hi-Z clipping gets reflected back thru the toroid to the 50 ohm side. Not good for HF but at 137 Khz it might work well enough. Oops.. think it'd take 3 windings on the transformer: 50 ohms in, 50 ohms out, plus a third winding to shunt excess energy to ground so it doesn't couple into the receiver. I reserve the right to make more mistakes :-) Bill VE2IQ |
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