[hpsdr] HPSDR Transmit Frequency

[Joe Martin K5SO]

Merv,

The answers are:

2) If you select 14.310000 MHz and LSB your (suppressed) carrier  
frequency is 14.310000 MHz.  The sideband frequencies for the LSB  
transmission will range from 14.310000 MHz - the lower limit audio  
freq you have set in Setup > Transmit > Transmit Filter > Low  down to  
14.3100000 MHz - the upper limit audio freq you have set in Setup >  
Transmit > Transmit Filter > High.

3)  If you select 14.310000 MHz and USB your (suppressed) carrier  
frequency is 14.310000 MHz.  The sideband frequencies for the USB  
transmission will range from 14.310000 MHz + the lower limit audio  
freq you have set in Setup > Transmit > Transmit Filter > Low  up to  
14.3100000 MHz + the upper limit audio freq you have set in Setup >  
Transmit > Transmit Filter > High.

Joe K5SO


On Oct 29, 2010, at 10:32 PM, Merv Thomas wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> There is a CW offset of 200Hz which cannot be lowered so my  
> observations are:
> 1.    If I set the VFO A in PowerSDR at 14.310000Mhz and make a  
> "Tune" transmission I note that the actual measured freq is  
> 14.310000Mhz  on both CWL and CWU- this makes sense to me.
> 2.    If I keep the VFO A freq at the same 14.310000Mhz and select  
> LSB and make a "Tune" transmission my actual transmitted freq is  
> 14.309800Mhz.  The 200Hz offset comes in to the equation.
> 3.    Ditto 2 above but select USB and my "Tune" transmitted freq is  
> 14.310200Mhz.  The same 200Hz CW offset comes in to the equation.
>
> My QUESTION is what is the actual freq I am transmitting on in 2 & 3  
> above when I use the LSB or USB mode but actually speak rather than  
> select the "Tune" button??  Of course I do not transmit voice on LSB  
> at the above mentioned freq!!
>
> Thanks for any help as ever.
>
> Merv  VK6BMT
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