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Eric: What is difference between CS6 and CS7?

A

Anonymous

Guest
Eric,
I understand that the CS7UMD is for underwater use and the CS6 is for land use but I have heard some conflicting bits of information on forum posts.
On some forum posts it is said that they are the same design but in a different case and on other posts it is said that the CS7 has a microprocessor and the CS6 does not. The CS7 is also said to go deeper the the CS6. I assume that operationally they are the same; two knobs with the same functions both using 8 AA batteries and having a low power drain because they are both low pulse power units. Please give us the facts. What is the difference?
 
If you looked at the schematics for the CS6 and CS7, the only difference you would see is the way the timing pulses are generated. Everything else is the same, except for a transformer to boost the audio for the underwater phones, which are less efficient than ordinary phones. The timing pulses in the CS6 are generated by a 555 type timer clocking a 4017 decade counter. In the CS7 it is a PIC that replaces these two plus also the audio generator. One reason for this is that it saves a lot of board space and the CS7 pcb is about 1/3 of the size of the CS6 pcb. Doing the timing in a different way does not change the performance of the detector although the PIC timing should be more accurate. This is particularly relevant for the first sample delay. I noticed that generally it was a bit longer than the recommended 15uS (17 or so) in the case of the CS6, with the Frequency control at its high setting. On the CS7 it was right on 15uS. This would explain small differences in sensitivity, particularly with less conductive objects.
Eric.
 
Eric,
Thanks for the prompt response. I knew that you you know the answer.
This is a great Forum! Thanks for your effort.
bbsailor@aol.com
PS
Is the schemetic for the CS6 available?
 
Hi,
Sorry,I have the schematics because I was involved in the design, but they are C.Scope's property and I am not free to pass copies on. All I can do is discuss the principles in a general way.
Eric.
 
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