[BC] Inovonics model 520

[Mike McCarthy]

Some scopes are better than others.  But any decent, properly operating 
scope of recent vintage with a bright display is better than a typical 
mod-monitor for analog measurements.

The "best" scope you can use is one which can "zoom" in on a stable trace 
to examine the trough in the envelope so as to set the -100% modulation 
level.  Assuming you have a good "linear" amplifier which is the generating 
test device, the same can be done for the +100% modulation on the same 
waveform. Both should be equal at that point. If the scope can be operating 
in a manner with a peak indicator adjusting for the carrier at 50% and the 
+ peaks at 100%, then 125%, that's all the better.  As for the +125, that 
get's a bit trickier. I have a HP modulation analyzer which I can set up to 
parallel the monitor and set the +125 that way.   Either that or a peak 
reading scope is your best bet if ever questioned.

Otherwise, any scope with a decent triggering circuit can be used, but with 
the caveat that your reference measurements are only as good as that 
scope.  Therefore, I don't use anything older than a known working TEK 
465.  Old by today's standards, but still a GREAT scope in it's own right.

OTOH, the trapezoid display on a super bright screen through a TCT sample 
at the base current/common point is really the BEST tool to set up your AM 
TX and monitor it's performance long term.

MM

At 09:51 PM 1/30/2006 -0700, Robert Reymont wrote
>A scope is best for accuracy..   I calibrate monitors to a scope!  A 
>monitor is only a good as the calibration.
>
>
>At 10:27 AM 1/31/2006 +0800, you wrote:
>>I'm looking  for a mono AM mod monitor, that will give greater accuracy 
>>than a scope.
>>
>>Any thoughts on the 520?
>>
>>Thanks
>>Warren Mead
>>AM1611
>
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