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Date: Wed, 13 May 2009 10:23:44 -0400
Message-ID: <57a24ca70905130723h48c7f9a1jcb0a37047d5a594a@mail.gmail.com>
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: AW: Low freq DDS VFO any ideas / for sale etc ?
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Rik,

   Yes, I believe that would work. However I couldn't find a cost
effective 50MHz OCXO, TCXO etc AND my dds developed problems with the
optical encoder so I decided to get a used HP 3325A synthesizer which
included a built in ovenized oscillator for less money than a 50MHz
TCXO which needed to be added to the dds.

--=20
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1


On Wed, May 13, 2009 at 9:59 AM, Rik Strobbe
<rik.strobbe@fys.kuleuven.be> wrote:
> Warren,
>
> I guess this problem can be solved by removing the onboard xtal and
> injecting a signal from a stable frequency source.
>
> 73, Rik =A0ON7YD - OR7T
>
>
> At 15:29 13/05/2009, you wrote:
>>
>> Graham, Gerhard,
>>
>> =A0 =A0This is EXACTLY the dds that I used and observed considerable
>> temperature drift when operating QRSS 60 on 137 kHz.
>>
>> --
>> 73 Warren K2ORS
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0WD2XGJ
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0WD2XSH/23
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0WE2XEB/2
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0WE2XGR/1
>>
>>
>>
>> On Tue, May 12, 2009 at 5:46 PM, Beckmann, Gerhard
>> <beckmann.erlangen@freenet.de> wrote:
>> > Hello Graham,
>> >
>> >
>> >
>> > the DDS-Oscillator under this link may partial meet your requirements=20=
=85
>> >
>> >
>> >
>> > http://www.box73.de/catalog/pdf/FA0407_694-695.pdf?osCsid=3D983aae56f38=
3b
>> >
>> >
>> >
>> > 73 de Gerhard / =A0DK6NI
>> >
>> >
>> >
>> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> >
>> >
>> >
>> >
>> >
>> > ________________________________
>> >
>> > Von: owner-rsgb_lf_group@blacksheep.org
>> > [mailto:owner-rsgb_lf_group@blacksheep.org] Im Auftrag von Graham
>> > Gesendet: Dienstag, 12. Mai 2009 23:25
>> > An: rsgb_lf_group@blacksheep.org
>> > Betreff: LF: Low freq DDS VFO any ideas / for sale etc ?
>> >
>> >
>> >
>> >
>> >
>> > Looking for a low frequency , 100k > 30 Mhz ish dds vfo, possibly a kit
>> > ,
>> >
>> > better a part completed kit =A0would be =A0better ...second hand workin=
g
>> >
>> > even better !
>> >
>> >
>> >
>> > Ideal would be a box with a frequency =A0display and a key pad to
>> >
>> > enter the =A0frequency , preferable to a pc addressed device
>> >
>> >
>> >
>> > Couple of volts sine wave out , nothing fancy , simple master
>> >
>> > oscillator =A0for =A0tx
>> >
>> >
>> >
>> > Any =A0ideas or =A0links (any for =A0sale ?)
>> >
>> >
>> >
>> > Tnx- Graham .
>
>
>