|
From: | Ian Wraith |
Subject: | Re: Subject: [Discuss-gnuradio] APCO 25 |
Date: | Mon, 20 Jan 2003 23:12:39 +0000 |
Hello >Not familiar with the RF2711. Who makes it? It was made by RF Micro Devices but doesn't seem to be in production anymore. I was given a few samples last year. Basically you give it an IF and LO which is twice the IF and out comes an amplified I & Q.
Have you considered just an appropriate bandbass filter centered at 10.7 MHz (if not already suitably band limited), followed by mixing with 10.7 MHz (or there about) to convert to (or near) baseband, followed by low pass, then soundcard? This setup could then be used to demod pretty much anything that will fit within the bandwidth limits of the sound card. We've already got a quadrature demod block: VrQuadratureDemod
This sounds like a better route. I can take my IF from the output of the WFM ceramic filter rather than its input so I will then only have a bandwidth of 200 KHz or so. I have 10.8 MHz xtal somewhere and have some SBL-1 mixers in my junkbox. Now you have set me thinking .. Regards Ian
[Prev in Thread] | Current Thread | [Next in Thread] |