[R-390] Image problem solved - Not.

[Roy Morgan]

At 10:15 PM 10/25/2007, Flowertime01 at wmconnect.com wrote:
>Tony,
>
>If you have one and only one station giving you a second harmonic you have no
>problem. Its easy to get enough second harmonic from an AM station.

Just a fine point that may help:  A harmonic from an AM station does not 
sound like the fundmental signal. All the signal is doubled (or trippled) 
including the modulation sidebands. So it won't sound right.

A mixing product will sound right or at least more intelligible.  Some 
other signal combines with the AM station one to produce a signal shifted 
in frequency, just like in the receiver as signals are mixed (usually down 
in frequency) to the lower IF frequency.

I think that in this situation, a lot can be learned with a signal 
generator fed into the antenna jack.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
13033 Downey Mill Road, Lovettsville, VA 20180
Phone 540-822-5911   Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-975-6097
roy.morgan at nist.gov --