Yep...
The newer DDS chips 99xx family with 14bit D/A are much better and
suitable for use in tube radios and as mixer inputs because the spectral
purity is sufficient. earlier DDS systems would produce all sorts of
birdies and products.
Curt
Jim Shorney wrote:
On Mon, 16 Mar 2009 23:12:06 -0400, Garey Barrell wrote:
I have no quarrel with external modifications or accessories such
as your DDS VFO,
I will admit the DDS VFO idea looks interesting, and I understand they
have made great strides in the DDS area in the past few years. To me,
there's something about a digital VFO that doesn't *feel* like a radio!
But that's personal preference. I don't think I'll do the DDS thing for
Drake. Although I do have some wild ideas about multiple RV7s on the
TR7/R7 combination.... I think the switching capability is there to do
some interesting stuff. Can you say "four independant analog VFOs"? Who
needs memories. :)
However, considering the relative rarity and expense of the external
VFO for my HyGain 3750, I may look at the DDS idea down the road for
that application.
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and he will
learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://radiojim.exofire.net
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
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