• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:

IFs of BC246, SC230, BC72, BC92

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Apr 2, 2005
Taipei, Taiwan
I had posted following message: "I've received IMD from 139MHz taxi dispatch freq to another freq up 42.6MHz. So maybe 21.3MHz is one of IF for BR330T. Hope this helps! And http://myweb.accessus.net/~090/bc-780xlt.html#interfere shows 3 IFs of BC780XLT can give you some clue! " . Out of curiosity, I find the exact IFs of BC72 and BC92 at page 58 of http://www.racingelectronics.com/bc72manual.pdf . It shows 1st IF 380.7MHz, 2nd IF 21.3MHz, 3rd IF 450kHz. So I conclude that BC246, SC230, BC92, BC72 share such IFs. No wonder I always receive 3rd IMD from 506.775MHz taxi dispatch at 464.175MHz. Hope this helpful!
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