Ron,
You are so kind to send them, and I got them... I will use your
suggestions in construction! Thank you again sir!
--
Thanks and 73's,
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On Fri, 2015-07-31 at 01:32 -0400, Ron Watson wrote:
> David, Frank may not have some pictures I have and will email to you.
>
> The RE units (238, 240A and 242 that I have) have digital filters in them
> that come off the IF and gate at 120 Hz. then amplified and shaped for video
> and audio, so the 60 Hz. components are well above any other source sounds or
> frequencies.
>
> As seen in the pictures, you can make a pretty fair stab at similar results
> just by hooking a common O-scope to the audio output of an AM receiver, Icom
> 746 used in the pictures, also a comparison is the output of the Sprague 700
> type units.
>
> On the O-scope you will need to trigger on the line frequency, I have done
> fairly well by using a sine wave inverter in the car and triggering on it. A
> sweep speed of 1 ms./div gets close to the same display as the RE units but I
> prefer to sweep at 2 ms. (see pics). I also prefer to use a separate scope
> when convenience is not a big factor, triggered scopes give a lot more stable
> and defined view.
>
> Feel free to email me directly with any questions.
>
> Also attached a block diagram of an earlier RE unit.
>
>
> Ronald E Watson
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