[Elecraft] Elecraft technology

Thu Jan 1 00:01:22 2004

In a message dated 12/31/03 5:59:36 PM Eastern Standard Time, [email protected] 
writes:

> On 12/31/03 8:56 AM, [email protected] at [email protected] wrote:
> 
> >While we're on the subject, the old urban legend that hams use LSB on 75 
> and 
> >USB on 20 because of early rigs with 5 MHz VFO and 9 MHz filter is a myth. 
> >It only works with a 9 MHz VFO and 5 MHz filter
> 
> IF - 9.0 MHz
> LMO - 5.0 .. 5.5 MHz
> 
> 20m: 14.0 MHz - 5.0 MHz = 9.0 MHz
>      14.5 MHz - 5.5 MHz = 9.0 MHz
> 
> 80m:  3.5 MHz + 5.5 MHz = 9.0 MHz
>       4.0 MHz + 5.0 MHz = 9.0 MHz
> 
> Seems to work great. 

That's the tuning range. The sideband inversion is another matter. 

The only side effect is that 80m tunes backwards 
> 
> from 20m. Seems like there was a Swan rig that acted this way.
> 

Most all of the Swans used an IF in the 5 MHz range and a VFO in the 9 MHz 
range for 75 and 20.

See the math in my other post for the proof.

73 de Jim, N2EY

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