New in 2003 - 2004:
Orion & IC-7800
Ten-Tec Orion & Icom IC-7800
Until the Orion came out, 99% of modern transceivers
were up conversion radios.
(K2 the exception)
If the first IF is above 10 meters (30 MHz), can you switch
in a narrow CW roofing filter?
The fractional bandwidth of a 600 Hz CW filter at 5 MHz
is the same as a 6 kHz filter at 50 MHz.
Thus most up conversion radios have a first IF at least 6
kHz wide & often as wide as 15 kHz.