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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: Yup. Just over South Mountain in Bethlehem. posted by meisterkleef on January 5, 2007 at 08:00:22:
I used to live in Hellertown, right next to Lehigh's saucony athletic fields, in a place called Bella Aqua farm. Those were fun times.Anyway, I still think you have misdiagnosed your problem. I think you have adjacent channel interference from WMUH at 91.7
If you use the radio locator link below, you'll see for you, 91.7 is a stronger signal than 91.9. The stations are only 200kHz apart, and most tuners have standard IF filters that are 280KHz wide. This is why one station adjacent to another interferes with the other on standard tuners.
Click on the "i" link to the left of the station listing, then coverage map, and you'll see the X showing the position of the transmitter. This will give you an idea of the relative position of the two transmitters to your receive location.There are two ways to deal with it. Brute force way is to mod the tuners narrow IF circuit for more narrow filters. I suggest 2 Murata 150's. I assume you don't already have a tuner with ultra narrow filters like an Onkyo T-9090II or Yamaha T-85. Another good one is the Sansui TU-9900.
The finesse way is to use a horizontal antenna to eliminate WMUH. Your vertical omni antenna has no null in the horizontal plane. You do this by tuning the tuner to WMUH and turning the antenna for lowest signal strength. You may be able to use the side null of a horizontal dipole if the two stations are located 90 degrees apart from your receive location. A cheap test could be done by rotating horizontal positioned rabbit ears. If one station is in front, the other behind, roughly 180 degrees apart, you need a multi-element antenna (yagi or log periodic) with a good front to back(F/B) ratio. I suggest at least 6 elements, radio shack sold an FM only model (made by antennacraft called the FM-6) for 25. I think Stark still sells it. The better one is APS-9A for 100. or so.
Bob
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Follow Ups
- Re: Yup. Just over South Mountain in Bethlehem. - BFitz 09:11:42 01/05/07 (1)
- I know it well. - meisterkleef 11:55:44 01/05/07 (0)
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