[hpsdr] QEX covers

[Chris Testa]

Here's the service manual for a wouxun kg-uv6d, which goes into pretty good
details about how this cheap Chinese HT works.  It does have a quadrature
detector in it, and does some DSP on the microcontroller.  The 8-bit
microcontroller looks to be tailored for just this purpose - it has a 2
tone generator built into it for CTCSS.

I'm not sure if this classifies as an SDR.  They do use some very clever
ideas to keep BOM down.

www.wouxun.us/images/KG-UV6D-UserManual.pdf‎

FM Detector - TA31136F
VCO - LM2336
MCU - EM78P568

(you will need ghostview or another nice PDF viewer to zoom in far enough
to see on the schematics on the last page.)

73,
Chris KD2BMH


On Thu, May 1, 2014 at 10:54 AM, <mstangelo at comcast.net> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Don't those cheap Chinese VHF/UHF handi-talkies use SDR technology?
>
> Does anyone know the chipset?
>
> Mike N2MS
> ----- Original Message -----
> From: lstoskopf at cox.net
> To: hpsdr at openhpsdr.org
> Sent: Thu, 01 May 2014 04:16:32 -0000 (UTC)
> Subject: [hpsdr] QEX covers
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Congrats.  Kind of sad though.  Below is an article on how to measure
> crystals.  Over the years I gathered boxes of crystals, measured bunches
> and made filters.  Now the fast A/D chips have nearly made that technology
> an historical footnote. Soon VHF transverters also.   N0UU
> _______________________________________________
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20140501/bc5bff1a/attachment-0003.htm>