"Diverd4777" wrote in message
...
All:

Inquired about the kaito KA 105 to Kaito USA

http://www.kaitousa.com/KA105.htm

asked if it was single IF or double IF

Got the reply back:

"It is a single IF, but works as a dual conversion radio"

- Is this possible?

Dan





They might meant "Works as well as a dual conversion radio". That's
possible, if they're compairng a poor dual conversion radio to a good
single conversion one. Dual conversion describes a circuit, not a
desirable performance specification such as adjacent channel
selectivity, image rejection or signal to noise ratio. Back in the
dinosaur radio days, they tried to improve the image rejection of single
conversion radios with more high Q RF sections. That worked but it got
much more expensive with increasing frequency. Double conversion proved
to be the cheaper way.

It seems very unlikely an inexpensive single conversion radio will have
more selectivity or a better image rejection ratio than an inexpensive
double conversion radio. It might have fewer birdies or a lower noise
floor, however.

Frank Dresser