It amazes me that there is still so much confusion and misinformation about something so simple. There are two ways to get 80 meters (3.5-4 MHz) and 20 meters (14-14.5 MHz) using a single VFO and IF:

9 MHz IF, 5-5.5 MHz VFO:

   - Sideband direction is the same on both bands
   - VFO tuning direction is inverted on 80, non-inverted on 20

5.25 MHz IF, 8.75-9.25 MHz VFO:

   - Sideband direction is inverted on 80, non-inverted on 20
   - VFO tuning direction is the same on both bands

So the convention about using LSB on the low bands and USB on the high bands has nothing to do with a 9 MHz IF. It may have to do with using a 5.25 MHz IF and a VFO centered on 9 MHz.

Alan N1AL


On 02/14/2018 12:08 PM, Ken G Kopp wrote:
Here's a URL to a website with lots of information:

http://www.ac6v.com/73.htm#LSB

Or, search "BC-458 command set transmitter" and
"Central Electronics 10A" with your browser.

73!

Ken Kopp - K0PP
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