Bob -
Not particularly difficult. You need about 2-3 V p-p from it, maybe less, which means you may need
a transistor, or possibly an MMIC. I'm not familiar with the IQPro, but for this duty you'll need
to cover from about 11.6 to 40.6 MHz in 500 khz steps. It would be more convenient if you could
program the 500 kHz steps, but not necessary. If you plan to use it for transmitting you'd probably
need a low pass filter on the output, depending upon how clean your DDS is.
The FS-4 output is about 300 ohms, so your 50 ohm output should drive it ok. The BAND oscillator
stage is configured as a common Base (grounded grid!) amplifier when you select an 'empty' crystal
socket and feed your RF to the 'common' lead that connect all of the crystal sockets together. The
shield of the RF cable goes to the chassis, NOT the 'other' crystal socket pin.
Let us know what you come up with!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Robert Fish wrote:
Hi Guys,
I have an IQPro VFO that I built for a Direct conversion receiver I am building. It is a 9854
based DDS VFO designed by Craig AA0ZZ. I have decided to go a different route with the DC receiver
LO.
That leaves me with a perfectly good VFO to find a use for. I thought that maybe it would work as
a crystal eliminator to give me general coverage for my R-4C (and R-4B).
What do you guys think, will this work? What levels and impedance do those receivers look for at
the accessory crystal sockets? I don't mind a few birdies as long as I know where they are and
there aren't thousands of them.
My first thought was; This is probably more difficult than it seems or I would have heard about
more people doing it.
Thanks as always,
Bob K6GGO
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