What is my frequency?


 
     | Out of Band   |               |              |
     |      |        |       |       |       |      |
     |               |               |              |
     |      |        |       |       |       |      |
     |               |               |              |
     |      |        |       |       |       |      |
     |               |               |              |
     |      |        |       |       |       |      |
     |               |               |              |
     |     audio     |    audio      |      audio   |
     |3 Khz wide USB |3 Khz wide USB | 3Khz wide LSB|
     ^               ^               ^              ^
   18171           18168           18165          18162
     ^               ^               ^              ^
           
          
       VFO Frequency
      or
        Suppressed Carrier
 
 
  

If you are on USB and your radio is showing 18165, your audio is 3 Khz wide, and above your suppressed frequency. If you are closer than 3 Khz to your upper band edge, and on USB, you are out of band. On the other end of the phone section, if your radio is showing 18110, your USB signal is from 18111-18114, all above 18110 with a safe margin, so you are OK. Operating on 18110.5 would be pushing it, but if equipment is PEREFECT, and not excessive compression, would be OK.

This means if your radio is on 18168, you will be out of band if you transmit. This also applies if you transmit on 20m with your radio showing 14348. This would put your USB signal from 14348 to 14351, thus out of band.

If you are at the bottom of 15m SSB, 21200.5 on USB for a Extra would be very close, but with rig adjusted correctly, it would be OK. Remember, your rig shows Suppressed carrier, not center of emission on SSB. 21201.0 would be a better choice....

This also applies to LSB, but in reverse. You need to stay 3 Khz away from the lower edge on LSB. This information is for a properly adjusted radio.



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