[600MRG] ARC5 Receiver on 630m Question

[DANA MYERS]

>     On 08/03/2021 1:36 PM Dwight Blevins via 600MRG <600mrg at mailman.qth.net> wrote:
>      
>      
>     I've been tempted to buy one of those China
> 
> 
>     ATS-25 dsp receivers
> 
>     just to see how it performs. Goes down to about 150 khz. One of the eBay stores threw me an offer of $99.00, free shipping. I passed. Think I'll wait to see what gets posted in the online reviews. Great price but I'm a bit skeptical.......KW7T
> 
These inexpensive receivers use the SiLabs Si4732 receiver chip, which is remarkably good. The same family of chips has AM/FM broadcast receivers which are at the heart of many AM/FM portables (most of the modern Sangeans, for example).

Silicon Labs did some very clever tricks in these receivers; for one, they auto-tune the AM BCB loopstick using an internal capacitor array (you can tell when this happens if you listen with another receiver at the same frequency, you hear a burst of pulses as it auto-tunes). The receiver automatically changes internal clock rates so that internally-generated birdies are always removed from the passband, so on.

The Si4732 receiver is really very good.

73,
Dana  K6JQ

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