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In message , Irv Finkleman
writes "M. J. Powell" wrote: In message , Irv Finkleman writes RB wrote: Brings back scenes from old WWII movies.... Small loops are still used and seem to be very effective for DF. I think that the ARRL antenna book provides information in this direction. One system I saw used a short ferrite dipole array. In most cases, DF sets displayed their goniometer outputs on a CRT or as signal strength on a meter. In this case, the dots and dashes melded into a continous output because of the persistence of the CRT or the AGC delay of the receiver. I don't think there was a swinging goniometer with the CRT DF set. The output of the two loop aerials fed the X and Y plates respectively so that the trace appeared at the right angle and the bearing was read from the screen. Mike There were a number of different types of DF sets. Some, as you point out had x and y plates connected to the loops, another had a mechanically rotating gonio. We had one for radar detection which used horns with crystal detectors in it which went to x and y plates (through amps). That's interesting. I didn't know of microwave DFing. The HFDF used loops feeding a mechanically rotating gonio with output to a crt. Ah! Right. Now I've got it. Thanks. Mike |
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