[DSP-10] 10 MHz ref

[ww2r at mgef.org]

I tried using the 1V p-p out of my 10M locked reference and found
unreliable operation, so i fed it through a 74ls04 and now use the 5V
signal

As i got irritated having to take the ez-lite board out every time i
wanted to change the link to go from internal to external reference, i
used the remaining sections of the 04 to detect when 10MHz is being
supplied externally and do the switch over automatically using a small TO5
DPDT can relay, at the same time disabling the internal oscillator. Its a
small board that fits on the 3 pin oscillator plug under the ezlite
enclosure. I must get round to writing it up someday!

Dave

ww2r

change from inter> Hi folks,
>
> I just picked up a used DSP-10 and I would like to get it on the air.
> It is configured for an external 10 MHz reference and I would like to
> use it with my 10 MHz OCXO that I scrounged from a "mystery microwave
> box" this summer.   According to the scope, the OCXO is giving me just a
> little over 2V P-P at the output.  Can I just dump this in via a
> capacitor or am I going to need to build myself a little amp?
>
> I have the software working--it comes up and beeps at me telling me that
> it doesn't have PLL Lock, so everything else seems ready to go.  I'm
> really looking forward to playing with this!
>
> Andy K0SM/2
>
>
>
>
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