"Marijan Miletic, S56A" wrote:
> QRN is random short but very strong pulse.
As short as ignition pulses?
> Even today my FT-1000MP has two NB settings...
Is any of them actually effective against QRN?
> >> W8JI RX IMD measurements with 10 kHz spacing seems to be USA tailored.
> >In what sense?
> First IF filters are usually 15 kHz wide and you can squeeze both 10 kHz
> spaced test tones to make life difficult for second mixer. 20 kHz spacing
> is much easier case. Only Orion and K2 use narrow front end IF filters
> until expensive IC-7800 and FT-9000 showed up. Their high BDR claims shoud
> be always checked against image and IF rejection which is within operating
> frequency range!
OK, so the 10 kHz spacing is also IC7800 and FT9000 tailored :-)
73,
Sinisa YT1NT, VA3TTN
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