[QuadList] Merlin vs stock Ampex

[Don Norwood]

Hi Park:

More questions than answers....  What are the frequencies of the mutiburst 
packets?  Also, how are the measurements made (EE or playback)?  For some 
reason, 1328 has no color burst, so I'm not sure if the waveform is "valid" 
to compare to 1340.

The performance of the 1200 is related to which filter is installed in the 
signal system.  The best is 4.5 MHz, and the response should be virtually 
flat to that point.  Based on that, I'm guessing that this is not a 
"standard" multiburst with the top packet at 4.2 MHz.  But if the packets 
are higher frequencies, how are the higher frequencies getting past the 
filter?  A more revealing test is to use a 5 MHz sweep instead of 
multiburst.  In any event, for comparison, both machines need to have the 
same filters.

Then you get into what part of the system is doing what.  It's good to look 
at the output of the demods to be sure that they are both correct and 
identical, and then compare it to the output of the machine.  That way you 
establish whether differences are in the signal system or in the processing.

Don

----- Original Message ----- 
From: "C. Park Seward"
Subject: [QuadList] Merlin vs stock Ampex


> Here are some pics I took of the two machines. Same test signals, same 
> scope.
>
> Can you guess which one is which?
>
>