[Kenwood] SM-220

[Peter A Markavage]

Pan Display width is either +/-20 KHz or +/-100 KHz, selectable from the
front panel.

Pete, wa2cwa
 
On Sun, 25 Jan 2009 14:15:31 -0600 Rob <k5uj at sbcglobal.net> writes:
> What is the range of frequencies displayed by the 220 panadapter?  Is 
>  
> it dependent on the width of the 8 MHz IF filter?   To me it seems  
> 
> that would make it so narrow as to not be very useful.
> 
> 
> > Personality, the SM-220 is getting to be
> > less of a value to have in the long run. Visual transmitter 
> monitors  
> > are
> > easily attainable using an off-the-shelf type flea market scope 
> and a
> > simple RF pickup.
> 
> 
> I made an inline RF voltage pickup by taking one of those cheap CB 
> swr  
> meters and drilling a hole in the cabinet and adding a BNC jack, and 
>  
> running a wire from the jack's center to the pot that adjusts the  
> forward set level for the meter.  Since the meter needs a diode to  
> 
> power it off of picked up RF, a tap off the pot that varies this  
> source to the meter gives a variable level to the BNC jack so the  
> scope has a signal from the exciter for that part of the trapezoid  
> 
> display, for making sure the amp is linear.   Cheap five buck flea  
> 
> market swr meter--millions of them were made for Midland, Lafayette, 
>  
> Allied...the older ones in steel cabinets were pretty well made.  
> the  
> pickup on the high power side of the amp can be as little as a coil  
> 
> wrapped around the feedline....
> 
> 73
> 
> rob / k5uj
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