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| To: | [email protected] |
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| Subject: | Re: LF: Re: DSP Question I/Q inputs? |
| From: | Wolf DL4YHF <[email protected]> |
| Date: | Wed, 15 Feb 2006 21:37:08 +0000 |
| Delivery-date: | Wed, 15 Feb 2006 21:36:43 +0000 |
| Envelope-to: | [email protected] |
| In-reply-to: | <[email protected]> |
| References: | <021520061715.18320.43F361A7000959930000479022007613940B97010D0A020E06979D0E03@comcast.net> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Mozilla Thunderbird 0.9 (Windows/20041103) |
Hi Warren, Just returned from a QRL trip to Bavaria so sorry for the delay.Not much to add to what Alberto said.. it's nice to have I/Q output from the frontend of an image-cancelling DC receiver, and to effectively double the bandwidth of the soundcard input (for example, observe a 96 kHz wide spectrum band if the soundcard supports a true sample rate of 96 kSamples per second). But for LF... well .. To decode a PSK(31) signal from such a receiver, you could use SpecLab with I/Q inputs (stereo mode), use the mixer/multiplier block in "I/Q" mode to convert the signal back into a single-channel audio signal (can be done but tricky to set up; please ask if you need further instructions). The PSK decoder (aka "digimode terminal") must be connected to label L5 in the circuit diagram, after combining the downconverted I- and Q channels. Cheers, Wolf . |
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