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Originally Posted by howard
The wavelength of this radio station is 192m MW, the shortwave band on this PR73 is 87 - 197m and the IF is 470 kHz. I notice also that on these Perdios and also with later Perdio PR36s that this local radio station is picked up yet again at around 440m MW ! I guess therefore that this is a quality/design fault of Perdio radios  |
I had a bit of a problem getting used my head round these wavelengths in metres.... Translated to the more usual frequencies:
Local station 192m = 1563kHz
Interference freq 440m = 681kHz
This is probably a straightforward image problem:
1563- 2x470 = 623kHz give or take errors in your dial readouts.
All radios suffer this to some extent, certainly I would expect it to be normal with a very strong local station.
You say 'shortwave' is 87-197m. This is 1523kHz-3448kHz and is not what most of us would call shortwave. In fact there is only one shortwave band in this (90m, around 4000kHz, not widely used in Europe). Are you sure of this range?
In short, I would say this is a general shortcoming of receivers overloading with strong local signals. Very common in all receivers with a single conversion 470kHz IF.
Dave