Home › Forums › temp › BH 1415 BH 1417F and BA 1404 CHIPS and Distortion -Need Help › Analog tune digital tune all
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Analog tune digital tune all is the same, and I have checked the frequency of the tranmitters wiht a counter… this seems to be a problem more wiht the 1415 chip than anything else. The 1417 transmitters are clear as a bell.
Most transmitters with the 1415 chip will be ones with full 88-108 coverage, or more. The 1417 chip has frequencys selected by DIP switch. Some frequencies in the low end of the band some frequencies at the high end.
No mater which transmitter I tested, and I have a “few” any of the BH1415 transmitters, will show this distortion except one paticular model and make that I have.
Some one recomended changing the chip but most of these are under another circuit board and up on risers with the boards soderded together, just a lot of hassle for what its worth to take apart.
From what I understand, the 1415 and 1417 are similar chips but the 1415 you need a special controller to change frequencys, its a more advanced chip, but the basics are the same as far as the RF part, so I have heard, but thats part of what Im trying to find out also, because the problem seems to ge with the 1415 chip not the 1417.
The distortion is easy to hear, just turn the input volume down low into the 1415 and listen for it on your FM receiver. the lower the volume is adjusted, the more distortion you will here in the program signal. The same distortion is there if you hit the mono button on the receiver too, and I have listened to the distortion on a few receivers and all have the same distortion so its not the receivers.