[R-390] LW reception on R390A

[Roy Morgan]

At 01:25 PM 5/3/02 -0600, Bruce wrote:
>Thanks for the info guys. I've got about 700' of antenna stretched out, and
>I am able to hear a few beacons on my other rigs, just wanted to see how the
>'390 faired in this nether-region.

Would-be-longwavers,

I read the article in Hollow State news number two (actually it had a 
different name for the first four issues) and note that it contains 
additional information. I severely summarize here:

1) with no antenna tuner or preselector in use, overload, birdies and odd 
mixing products are present.

2) an antenna tuning and input impedance circuit is described.  Use of this 
network greatly improved both signal strength and reduced the 
interference.  A tank coil/capacitor having multiple taps and a variometer 
link coupling is described.  A capacitor is used to feed the signal into 
the test point.  This may prevent shorting AGC line voltage to ground.

3) suggestions for use of a toroid coil are made.

After the first four issues of the newsletter were published, the editors 
selected some articles to reprint.  The Long Wave article was included in 
that reprint but the diagram of the suggested toroid circuit was omitted.

I think that the bottom line is that a preselector and impedance match 
circuit is very much desired.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
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