[Hallicrafters] SX-111

[Edward B Richards]

Hi Bill et al;

I don't think a small error in alignment will cause images. Just be
certain that the RF and mixer circuits are peaked for the correct
frequency. Dual conversion is to REDUCE images, not necessarily ELIMINATE
them. A strong enough signal will get through any receiver. I see that
the hi IF is 1650, not all that high. That would put the image 3.3 mc
away.

I get the same thing on my Hammarlund HQ-100A. Good strong SW broadcasts
on 20 meters. I saw on a reflector where someone else was getting them
too. Of course my Hammarlund does not have dual conversion so the image
is only 910 kc away. I don't get them on my Hallicrafters SX-42, which is
single conversion, but with 2 RF stages. You may have to live with them
unless you want to trap them out or use a very sharp low pass filter.
Good luck.

73, Ed Richards K6UUZ



On Fri, 24 Dec 2004 12:54:13 -0500 Bill Gerhold <k2wh at optonline.net>
writes:
> Thanks to all who answered the tuning question I had on the SX-111.  
> On
> another issue, I have noticed that I am receiving international 
> shortwave
> broadcasts on my SX-111 where they should not be specifically, the 
> 20 meter
> band.
> 
> I know these are images, and are most pronounced on the 20 meter 
> band.  I
> thought this somewhat strange since the receiver is a dual 
> conversion unit
> and to my understanding, dual conversion exists to eliminate images.
> 
> My question is, since I have just performed an RF and IF alignment 
> on this
> radio, is it possible to foul up the alignment to enhance image 
> signals or
> to cause them by incorrect alignment?  It still receives 20 meter 
> signals
> fine, but some of the shortwave images are quite strong and sound 
> perfect.
> Unfortunately, I have no previous history with this receiver to know 
> if
> these images are normal or not.  Thanks for your help.
> 
>        Bill Gerhold, K2WH 
> Hallicrafters, The Radio Mans Radio
>      http://www.w9wze.org/
>  
> http://groups.yahoo.com/group/The19Group/
>       A VHF/UHF Repeater Group
>  
>  
> 
> 
> 
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