Message-ID: <833DED11D10C4FC1ADE8913FAA0FFE59@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <00f001c9d336$e20b35d0$0301a8c0@mal769a60aa920> <8C9A146733714A4BAFA422AEE4A99851@DR2> <010201c9d33a$d8907700$0301a8c0@mal769a60aa920> <FAAF6D7090564E3B901358FFFAC508D1@DR2> <AFD97937EF924E8B9E7EBF1BE2406777@AGB> <57a24ca70905122048u75f7dde4re9b182360a86651@mail.gmail.com>
In-Reply-To: <57a24ca70905122048u75f7dde4re9b182360a86651@mail.gmail.com>
Date: Wed, 13 May 2009 21:51:56 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Re: LF: Low freq DDS VFO any ideas / for sale etc ?
Content-Type: text/plain;
	format=flowed;
	charset="iso-8859-1";
	reply-type=original
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Ok Warren,

Yes  ..its not the dds , but the rock that runs it hihi , first one i saw in 
use was fed with nearly  1 ghz clock , before the  ppl clock systems .. dont 
think the ppl systems wander .. but  do seem to  produce more 'spurs ..  all 
my  kit is conventional xtla ref /ppl  , this vfo is run some old xtal 
controlled marine equipment  mf/hf .. so will be behind quite a few tuned 
cct's

(you  should of seen the traces from my  4 mtr (70 mhz)  wspr tx a while 
back .. now that was drift)

tnx- G ..

This one  seems to  fit the bill  , link from Gerhard ,

http://www.box73.de/catalog/product_info.php?cPath=112_115&products_id=119&osCsid=9nk30edle1v6k0oooub8e4fjs2

--------------------------------------------------
From: "Warren Ziegler" <wd2xgj@gmail.com>
Sent: Wednesday, May 13, 2009 4:48 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Low freq DDS VFO any ideas / for sale etc ?

>
> 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!
> -- 
> 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  would be  better ...second hand working
>> even better !
>>
>> Ideal would be a box with a frequency  display and a key pad to
>> enter the  frequency , preferable to a pc addressed device
>>
>> Couple of volts sine wave out , nothing fancy , simple master
>> oscillator  for  tx
>>
>> Any  ideas or  links (any for  sale ?)
>>
>> Tnx- Graham .
>
>



>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.287 / Virus Database: 270.12.26/2110 - Release Date: 05/12/09 
> 06:22:00
>