Digital cable optimal length?
Chris, BNC's: Yes. RCA's: Generally no; in a few cases maybe/approximately/sort of. :) See the last few posts in this thread: http://forum.audiogon.com/cgi-bin/fr.pl?icomp&1233658634 As for crimping vs. soldering, I don't know; sorry. Regards, -- Al |
Rodman, I have to admit to a little skepticism about that Canare RCA connector. In the page you link to, a special joining method is cited as part of the 75-ohm connection. The RCA plug itself is not claimed to be a 75-ohm device. Elsewhere I believe I have seen a Canare RCA plug which the company identified as "true 75-ohm", but this claim is in conflict with statements from other sources concerning the impedance inherent to the RCA design. I certainly would like there to be a 75-ohm RCA plug and would be happy to be shown one whose impedance figure could be trusted beyond the shadow of a doubt. |
Tobias- Read the Jan 2,1997 entry in it's entirety: (http://www.soundstage.com/feedback/resp01.htm) You would think that the people marketing, or the thousands that have purchased Canare 75ohm RCAs over the years, would have noticed if they did not deliver a true 75 ohms by now. (http://www.markertek.com/SearchProduct.asp?item=RCAP%2DC3A&off=6&sort=prod&skuonly=0&search=rca&pagesize=20) "Beyond a shadow of a doubt"? Buy a pair(they'll cost you under $10), attach them to some 75 ohm cable, and use an ohmeter on the assembly. I'm certain thousands of others have tested the RP-C4 RCAs, and LV-61S cables, to remove their doubts too. (http://www.avbestbuy.com/webpage/sayaboutcanare.htm) It seems some companies are buying Canare products, disguising/relabeling them, and selling them as their own(interesting)! =8^) |
The link Rodman provided to Markertek's catalog entry for the Canare connector is fairly persuasive, I think ("200MHz performance/vswr less than 1.1"), assuming it is factual. Also, note that the connector is designed to be crimped, which perhaps answers Dazzdax's question. I should point out, though, that an ohmmeter will be of no help in determining the impedance of a connector (or a cable, for that matter). It will indicate an open circuit (infinity ohms), because impedance and vswr (reflection) effects only come into play at high frequencies. Specialized test equipment that feeds a high (e.g., rf) frequency signal into the device under test would be required to make a meaningful measurement. Regards, -- Al |
