To: | [email protected] |
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Subject: | Re: LF: Low freq DDS VFO any ideas / for sale etc ? |
From: | Warren Ziegler <[email protected]> |
Date: | Tue, 12 May 2009 23:48:57 -0400 |
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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! -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 On Tue, May 12, 2009 at 5:25 PM, Graham <[email protected]> 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 . |
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