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| To: | [email protected] |
|---|---|
| Subject: | LF: Re. LF Receivers |
| From: | Alberto di Bene <[email protected]> |
| Date: | Thu, 24 Jan 2008 23:03:51 +0100 |
| In-reply-to: | <012420081531.5467.4798AF54000325AB0000155B22155688849C9D01CD05@comcast.net> |
| References: | <012420081531.5467.4798AF54000325AB0000155B22155688849C9D01CD05@comcast.net> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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| Z-usanet-msgid: | XID242maXwD20181X29 |
[email protected] wrote: Back to the AGC issues, Rob Sherwood of Sherwood Engineering has published a slide presentation on how poorly ALL DSPreceivers perform under QRN conditions due to the DSP handling of AGC: I don't know which receivers he tested, but the problem he reported is simply caused by a too fast attack time of the AGC, which reacts to narrow spikes and pulses, lowering unnecessarily the gain of the receiver and causing a sort of pumping effect. In software that can be fixed quite easily. That the manufacturers of blazoned DSP radios haven't done it, that is a different discourse... 73 Alberto I2PHD |
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