[Antennas] 930 Khz

2003年10月23日 07:09:00 -0700

Ray,
 You've gotten some real bum advice on this one. There is a very good and
easy, though not necessarily cheap possible solution to your problem, but your
problem has many facets.
1. Loop antennas, some with gain and preamps allow you to optimize the
desired signal and/or alternately null the undesired signals. I use passive
radio shack tuneable loops to pick up the Two AM stations where I am Chief
Engineer, one on 920 and one on 1460. Palomar makes a good active loop as do
others. At home I use an older Mckay dymek that is great. I don't think they
make that one any more, but try e-bay.
2. The radio you are using could make a big difference. As a reference radio
in my house, I use a car radio with a power supply and various antennas.
Generally speaking most car radios are much better than typical home radios on
the AM band. A good quality short wave receiver will be the exception to that.
3. The place you are using. Inside my house with aluminum siding, I get
greatly attenuated signals. When I lived in a Mobile home, again with metal
all around, I had problems. If necessary, locate your antenna outside.
4. It's true that many stations reduce power at night. If the power goes
down significantly, it could be impossible to pickup a station you hear clearly
during the day. Typical power reductions are from 10,000 days to 500 watts
nights. Some are a lot worse.
5. Many stations have different patterns at night and the station you want my
have a null in your direction at night.
6. 200 miles is a stretch for ground wave on 920. Most likely you will
receive skywave, and that varies a lot depending on time of day and time of
year.
Good luck and keep trying. Check out the web sites of the National Radio Club
for more information. These guys are the ultimate DX (Distance) listeners on
the AM band and have many good ideas.
Bill Croghan, CPBE, WB0KSW
Chief Engineer,
KOMP/KXPT/KENO/KBAD
Lotus Broadcasting, Las Vegas, NV
: [Antennas] AM on 930KC
>> I am interested in receiving an AM station from a city 200 miles away on
> 930Kc. I can receive it on my car radio 35 at a distance of 165 miles
> but cannot get it on the home receiver at 200 miles. Because of the low
> frequency, a directional antenna of the conventional sort, a Yagi for
> instance, of even a dipole, just isn't of reasonable size.
>> Is there some sort of directional antenna that I can use at this frequency?
>> The reason for directionality is not because I need gain so much as it
> is needed to reduce interfering stations on the same frequency to either
> side. I can I am sure get enough wire up there to receive the signal,
> but when I do I will be receiving EVERY AM station on 930 as well as the
> one I want.
>go down to as low as *5* watts
> at night, or even have to sign off at sundown.
>> For more info, check out http://www.100000watts.com/ and find the
> station you're looking for... altho they now charge for a subscription
> for key info. (sigh)
>> _Ray_ KB�STN
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