8640Jr Bands
8640Jr Bands
Filed in homebrew on May.19, 2012
My 8640Jr has 5 total bands, covering 850 Khz – 31 Mhz.
I took some measurements with the Bandspread Control in the Maximum, Minimum and Midpoint of its range.
I started with the VFO output frequencies, as all of the other bands are arrived at by dividing these frequencies down.
With the Bandspread Capacitor set to Maximum, I had a range of 13.6 Mhz to 27.858 Mhz.
Lowest Frequency with Bandspread Cap at Max
Highest Frequency with Bandspread Cap at Max
Next, I set the Bandspread Capacitor at Minimum. It is clear that this affects the high end of the range much more than the low end.
Lowest Frequency with Bandspread Cap at Min
Highest Frequency with Bandspread Cap at Minimum
Finally, I set the Bandspread cap to the approximate center of its range, and made more measurements.
Lowest Frequency with Bandspread Cap at Mid
Highest Frequency with Bandspread Cap at Mid
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