Re: AM radio that use a chip for the receive circuitry


Tom Crosbie G6PZZ <tom@...>
 

Thanks Peter,
I've had a quick read of the AN400 document and couldn't see an external varicap listed on the BOM's. I'm guessing the varicap might well be on-board the chip, which may be another reason for a decline in production, leading to a possible shortage. Of course it might just be a rumour.

Tom G6PZZ

-----Original Message-----
From: main@UltralightDX.groups.io <main@UltralightDX.groups.io> On Behalf Of Peter Laws
Sent: 07 April 2020 16:03
To: main@ultralightdx.groups.io
Subject: Re: [UltralightDX] AM radio that use a chip for the receive circuitry

On Tue, Apr 7, 2020 at 8:08 AM lamontcranston17 <nojunk@knology.net> wrote:

Maybe I need to refine my question a bit. The discuss was about if a
radio is designed today, will it incorporate a receive chip.
It all started with someone saying Varicap availability is
dwindling, (especially large sizes) and it was because of lack of
demand in AM radio because of receive chips.
The radio is on a chip. You put power in, RF in, get audio out.
Everything is done by the chip. Your only job is to tell the chip what you want.

https://www.silabs.com/documents/public/application-notes/AN400.pdf

https://www.silabs.com/documents/public/application-notes/AN332.pdf



--
Peter Laws | N5UWY | plaws plaws net | Travel by Train!

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