David wrote:
On 3 Dec 2005 19:10:06 -0800, wrote:
David wrote:
The R-390A has a Twinax RF Input.
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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.
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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