[HomeBrew] NE602 mixer replies

[Steven Weber]

>The crystals I have appear to be fundamental, not overtone.

That may be possible, though 72 is a little high for a fundamental crystal.
In any event, the caps should be on the order of 10p. If it oscillates at
1/3d of 72, then it is an overtone and you have to add a L/C tuned circuit
at 72 MHz, cap coupled to pin 7 to make it oscillate at the overtone. 


>I will be injecting the VFO ( AD9851 DDS controlled 1-30 MHz ) into pins 1 
>and 2  of the NE602.

In which case you have to couple into those pins with a transformer.
Otherwise, inject the signal into one of the input pins and bypass the
other to ground. 

>
>Richard VA3NDO 
>
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72,
Steve, KD1JV
"Melt Solder"
White Mountains of New Hampshire
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