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#7
December 4th 05, 04:23 PM
posted to rec.radio.shortwave
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IEEE study on twisted pair.
David wrote: On 3 Dec 2005 19:10:06 -0800, wrote: David wrote: The R-390A has a Twinax RF Input. ------------------------------------- And the R-390 also has the Twinax input. I have had much better sucess feeding it with coax. There is a simple mod to allow an unbalanced connection that is maybe 10dB more sensitive. Terry I used a CATV BalUn for mine. Note: The Unbalanced input bypasses the preselector. ----------------------------------------- A friend uses this scheme:http://www.r390a.com/html/feedpoint.html I use a 7 turn primary to 10 turn, CT to ground, secondary. I tried many different combinaitons and this appears to give the best overall response. The difference is minimal. I own a R-391, synchro motor drive, and my friend has a R-390A. In side by side tests it is difficult to impossible to tell which recever is active. It is cool enough to use the R-390 and my cats love to sleep on top of the receiver. Terry |
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