"Michael Black" wrote in message
...

"Lucky" ) writes:
Hi Pete

How can that be? You're saying the circuitry was designed that way? They
couldn't do double for all the bands??

Lucky

snip

Why not make it double conversion through all the tuning ranges?
Maybe because the extra conversion always adds problems, so if
you only have it in place when actually needed, you cut down
on unwanted spurs. Double conversion gives two chances for
images, and a mixer is more prone to overload than an amplifier,
so if you don't need the extra conversion for image rejection,
the extra conversion is a liability

Michael

That makes perfect sense. But, if they did it right the first time, there
would not be any added problems. Back in 1970-75, they were still in the
dark ages of radio

Thanks
Lucky