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Date: Tue, 12 May 2009 23:48:57 -0400
Message-ID: <57a24ca70905122048u75f7dde4re9b182360a86651@mail.gmail.com>
From: Warren Ziegler <wd2xgj@gmail.com>
To: rsgb_lf_group@blacksheep.org
DomainKey-Status: good (testing) 
Subject: Re: LF: Low freq DDS VFO any ideas / for sale etc ?
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Graham,

      Be aware that some of the available DDS kits use a
non-temperature compensated reference oscillator and may not be
suitable for longer duration QRSS work unless you take care to keep
them in a constant temp environment.
 I ran an inexpensive DDS driving my 137kHz transmitter, and you could
tell when I turned the thermostat up or down in the hamshack by the
direction of drift of my QRSS 60 signals!
 The worst case was when I had it sitting in a rack above my
oscilloscope, you should have seen the drift after using the scope and
turning it off!
--=20
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1



On Tue, May 12, 2009 at 5:25 PM, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:
>
> Looking for a low frequency , 100k > 30 Mhz ish dds vfo, possibly a kit ,
> better a part completed kit=A0 would be=A0 better ...second hand working
> even better !
>
> Ideal would be a box with a frequency=A0 display and a key pad to
> enter the=A0 frequency , preferable to a pc addressed device
>
> Couple of volts sine wave out , nothing fancy , simple master
> oscillator=A0 for=A0 tx
>
> Any=A0 ideas or=A0 links (any for=A0 sale ?)
>
> Tnx- Graham .