To: | [email protected] |
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Subject: | Re: LF: Receiver protection |
From: | N1BUG <[email protected]> |
Date: | Wed, 11 Jul 2018 10:08:26 -0400 |
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Hi Stefan, I did not yet measure the voltage across the diodes. When I finish the power supply and put my LF TX back on line I will make some measurements like voltage across the diodes while TXing, and RF voltage coming from the RX antenna into a 50 ohm load when TXing. I think there is no worry here about the diodes conducting during receiving. We don't have very strong signals (like DFC39) near either the LF or MF band. The preamps are preceded by reasonably good band pass filters which keeps away strong signals far removed from the band of interest. Oh, and there are no LF or MF amateur stations within a few hundred km. 73, Paul On 07/10/2018 04:49 PM, DK7FC wrote: > Hi Paul, > > Looks not critical for me. Just for interest, did you measure the > voltage across the diodes during TXing on the TX antenna? > > I would leave it as it is. It is just fine i think. > > But beware of conducting diodes during receiving! This can happen with > strong local transmitters at any band. The diodes become conductive at > much lower voltages, maybe 0.5V. If this level is reached there will be > much distortion, i.e. QRM. > > 73, Stefan |
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