Yep..
The N3ZI DDS kit has all the capability you might need with the
exception of a buffer/isolator.
And its cheap.
The packaging costs more than the board. It is a cost effective
alternative to additional band crystals.
Curt
KU8L
Kihwal Lee wrote:
Hi Dale,
I once connected a DDS directly to my R-4A's fixed freq crystal
connector on the side, replacing the premix signal (band xtal + VFO).
You just need to inject 5645 KHz (IF) + desired frequency. The DDS
had an option to set any arbitrary offset for display (-5645 in this
case), so it worked very nice. One of the obvious benefits is that
you don't need extra band xtals or something like FS-4/crystal
eliminator to cover other bands. But for it to be really usable, it
needed a buffer amp and probably more customized firmware. I didn't go
that far. By doing this I also learned that the 5995 KHz LO and/or
50Kc BFO drifts quite a bit and adding a digital dial or using a DDS
does not make too much sense unless something in the receiver is
broken. So, I decided not to pursue any further.
73,
Kihwal, K9SUL
------------------------------------------------------------------------
*From:* "[email protected]" <[email protected]>
*To:* [email protected]
*Sent:* Thursday, May 12, 2011 9:28 AM
*Subject:* [Drakelist] 4 -Line vfo
I have been looking at the 5-6 digital vfo kits that are on the
market. I have written all of them about adapting to the drake 4 line.
None have offered any info or help ,other than they make a vfo kit but
have no applications info to give. Has anyone in the group done such a
conversion> would like to build up a digital remote vfo. I don't want
to reinvent the wheel if some one has worked this out,and also I do
not have the background to design a interface circuit if needed. With
all the kits out there sure seems like a do able project.
thanks
dale WT4T
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