Re: Subject: [Discuss-gnuradio] APCO 25

[Ian Wraith]

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