[R-390] LW reception on R390A

[blw]

Roy,

I did some experimenting with my RBL-5 with and and without a
preselector/tuner. It makes a big difference. Also, getting the filters down
between 400 and 1200 Hz makes a big difference too with noise (QRN & QRM).
You can't ID most beacons using wider filters.

Bruce- if you have 700' of wire maybe you should look at a loop design for
LW and MW. I made mine out of PVC in a few hours and for under $20. I used
45 degree joints. I stuffed the inside of the PVC with 30 something strand
wire connected at the ends for around the same length you have.

If anyone is interested in how I made a 1000' delta vertical loop by myself
between 2 trees contact me and I'll try  to put together some plans to send
you. Each side was about 24', and I think I had 12 turns of wire. It was
very small, compact, and hard to spot even with orange wire. I think it took
less than 2 hours to build these once I knew how to do it alone.


Barry




> 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