"Dave Moorman" wrote in message
...
In article ,
"Joel Levine and Barbara Pickell" wrote:

You cannot generalize about single and double conversion. To simplify a
bit, the designer selects the IF as a trade off between image rejection
and
selectivity. On double coversion sets the first wider IF provides the
required image rejection while the lower frequency 2nd IF provides
improved
selectivity. However, you can also achieve improved selectivity with
the
crystal filter. Since the SX110 has a crystal filter, the relevent
question
is how effective is that filter.



The SX-110 is a step up from a 5-tube superhet. There is on RF stage, a
mixer/oscillator stage followed by the IF strip with 2 IF amps. There
is a xtal filter in the IF strip which will help with adjacent-signal
interference. The RF stage will help a bit with image rejection, but I
wouldn't expect it to be very good.

Dave

It's not all that good. I used to have a 110 and a 111. I have both again.

If you want a ham receiver, for CW and SSB, the 110 is a poor choice. The
111 has ham band only coverage and a product detector. Plus 5 steps of
selectivity. A major step over the 110.

The 110 is a decent AM shortwave receiver, and possibly a decent ham AM
receiver.

Dan/W4NTI

Only the SX-111 Mk 1 has the product detector.

73 Mark K3ZX

"Dan/W4NTI" w4nti@get rid of this mindspring.com wrote in message
hlink.net...

"Dave Moorman" wrote in message
...
In article ,
"Joel Levine and Barbara Pickell" wrote:

You cannot generalize about single and double conversion. To simplify
a
bit, the designer selects the IF as a trade off between image
rejection
and
selectivity. On double coversion sets the first wider IF provides the
required image rejection while the lower frequency 2nd IF provides
improved
selectivity. However, you can also achieve improved selectivity with
the
crystal filter. Since the SX110 has a crystal filter, the relevent
question
is how effective is that filter.



The SX-110 is a step up from a 5-tube superhet. There is on RF stage, a
mixer/oscillator stage followed by the IF strip with 2 IF amps. There
is a xtal filter in the IF strip which will help with adjacent-signal
interference. The RF stage will help a bit with image rejection, but I
wouldn't expect it to be very good.

Dave

It's not all that good. I used to have a 110 and a 111. I have both
again.

If you want a ham receiver, for CW and SSB, the 110 is a poor choice.
The
111 has ham band only coverage and a product detector. Plus 5 steps of
selectivity. A major step over the 110.

The 110 is a decent AM shortwave receiver, and possibly a decent ham AM
receiver.

Dan/W4NTI