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5618Re: [BCD396XT] BCD396XT Intermediate Frequencies / image reception

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  • Tony Langdon, VK3JED
    Aug 2, 2011
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      At 10:54 AM 8/3/2011, you wrote:
      >BTW, you can TRY the IF shift, but if the mixing is external the product
      >is already on 147.080 MHz, so nothing will help short of filtering out
      >147.080 MHz (which would adversely affect your reception on-frequency).
      >
      >You COULD also try the ATTenuator on that channel. That may solve it.

      Th issue is to determine if the interference is internal or external
      to the scanner. If it's internal, the attenuator may help, otherwise
      you will need to filter out one or both of the offending
      frequencies. If the source of interference is external, it would
      need to be tracked down, and if under your control (e.g. corroded
      antenna connector), get it fixed, otherwise there's not much you can
      do except use a directional antenna pointing at the desired 147.080
      MHz source, along with CTCSS to minimise unwanted squelch openings.

      73 de VK3JED / VK3IRL
      http://vkradio.com
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