[DSP-10] still no PLL locks

[Steven Bible]

Hello Jiro san,

You have a wonderful web page.  May I suggest a link to Babelfish at
http://babelfish.altavista.com/.  It translates your web page well.

May I ask your personal opinion of the Bitscope that I see you are using.
It looks like a nice piece of test equipment.  I have seen it advertised in
Circuit Cellar Magazine here in the U.S.  I would like to get an opinion on
its use before I order one from Australia.

73,

- Steve, N7HPR
 (n7hpr at tapr.org)


> -----Original Message-----
> From: dsp-10-bounces at mailman.qth.net
> [mailto:dsp-10-bounces at mailman.qth.net]On Behalf Of Yamamoto Jiro
> Sent: Sunday, March 06, 2005 3:15 AM
> To: Discussion of DSP-10 2-meter transceiver
> Subject: Re: [DSP-10] still no PLL locks
>
>
> > Courtney Duncan a écrit :
> >
> >>  Removed the slug from L102 and bent L103 and Q101 around a
> bit.  At this
> >>  point, when I inject ground at the junction of C113 and R105, I get
> >>  123.62 MHz.  When I inject 5V at the junction of C113 and R105, I get
> >>  129.07 MHz.  This should be precisely the desired tunable range.
> >
> > I just changed C117 from 10 pF  to 6.8 pF to center PLL range.
> >
> >
> > --
> > 73 Gérard F6FGZ
>
> In my case, I changed C117 from 10pF to 7pF and adjusted L102 in order
> to increase the LO freq  But it  did not cover all the tunable range
> needed. I then changed C141 from 10pF to 7pF, too. This time PLL locked
> at the range from 124MHz up-to 126MHz. While it still did not lock over
> 126MHz it is enough for me since  under Japanese regulations 2m amateur
> band must be 144MHz to 146MHz! For this reason, I also modified the
> original 144-148MHz band pass filter to comply with the 144-146MHz
> regulation. For more details please refer to my DSP-10 web page at
> <http://bagdad-cafe.homedns.org/mono/dsp10/construction/>. Sorry for
> non Japanese readers, that page is written only in Japanese.
>
> Regards,
> Jiro JQ2LMG
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