Hi John,
If you want to send me one I can test it and compare the results to the two 012-0482-00 cables I have.
Contact me off list at dennis at ridesoft dot com if you are interested.
If I had to guess at what will be the most important factor in duplicating the Tek cable it would be
1) Is the characteristic impedance of the RG-223/U cable really exactly 50.0 ohms?
2) Are the BNC connectors exactly 50.0 ohms and do the attach without any impedance variation?
3) Is the method of attachment so good that it has no reflections and mismatch.
Dennis Tillman W7PF
toggle quoted message
Show quoted text
-----Original Message-----
From: John Ferguson
Sent: Tuesday, April 30, 2019 1:10 PM
Subject: Re: [TekScopes] My TDR Evaluation of the SG503 012-0482-00
Cable has been uploaded
On 4/29/19 1:40 PM, Dennis Tillman W7PF wrote:
This raises another question which none of us may ever have the answer
to: What are the unique qualities the Tek SG503 designer wanted this
cable to have to be the ideal match to the SG503. It may be something as
silly, in retrospect, as the stiffness of the cable. Maybe he/she like
stiff cables. Why is it exactly 36in? Maybe he/she had a scrap piece of
stiff coax exactly that length in his drawer and he/she said "Use this"
to the production people when they asked what kind of cable should ship
with the SG503. Meanwhile we are all guessing at whether using this
cable with an SG503 is really important.
Dennis,Thank you so much for this wonderful informative tests and
discussion of these cables. And it would be interesting to kn ow what
motivated Tek to build this particular cable to this spec, while
wondering what part of the spec, or unwritten assumptions about the
ultimate cable assembly's properties were important.
I blanched at the cost of the real thing, and under advice from one of
our members, bought good BNC (not inexpensive) connectors, the rg223
cable, and built my own. But not having a TDR or any other way to test
the result, I don't know how good mine are.
Thanks again,
john
--
Dennis Tillman W7PF
TekScopes Moderator
