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#7
December 26th 06, 01:02 AM
posted to rec.radio.shortwave
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Hey Steve (sdaniel13), and Ron Hardin
Brian wrote:
"John Barnard" wrote in message news:8w0jh.509499$1T2.376915@pd7urf2no... Brian wrote: I don't have that problem, however I'd be inclined to try a LC series trap in series with the offending antenna, as the cheapest experiment (pick L and C to resonate at the broadcaster's frequency, to remove it perferentially), or even just a resistor, to see if overload is really the problem. Or a MFJ-956 passive antenna tuner, off the shelf. Or swap the antennas, and null the broadcaster with the ALA-1530, which is then the noise antenna, by orienting it. Or you can null the station with the wire antenna, though it's likely to be more inconvenient to reorient. Every antenna has null. A slight disadvantage of tuned traps is that they change the attenuation across the bandwidth of a station, so you can never quite eliminate the entire station across the audio spectrum because the second antenna still has the original shape. -- Ron Hardin On the internet, nobody knows you're a jerk. I compared the board to a schematic I found online which shows the bc trap and jumper components. Apparently the model I have is an earlier version lacking these revisions. Regarding your suggestions, swapping antennas proved ineffective, as the loop generally did not hear the noise, and when it did the level was far lower than on the wire, making canceling difficult. Using a twelve foot dipole I had no overload issues, but found it to be too short in some instances. I'm still looking for instructions on building a trap or bcb filter, but I'll keep experimenting with antennas in the meantime. -Brian Brian, I have plans on how to build a BCB filter that I could send to you as a PDF once I return to work and scan the document. Fortunately, I don't get back to work until Jan. 2. Cheers! John Barnard Thanks John! I sincerely appreciate and readily accept your offer. You can drop the pdf at briancummins at the gmail. Thanks again. -Brian Cummins Brian, No problem! The down side is that I won't get a chance to send it to you until 2 Jan. when I get back to work. I think that Mouser carries all the components needed to make the filter. John Barnard |
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