[hpsdr] PowerSDR Transverter Setup Query

[Helmut]

Hi Justin,

As far I know PowerSDR-XVTRs can only handle RX-DOWN-mixing, which generates
positive intermediate frequencies inside the 1. Nyquist zone. In your case
RX-UP-conversion is applied by using a real (positive) 1,33 MHz. Negative LO
would formally lead to negative IF.
But if you're interested in 630m, why you don't use the Hermes for this band
directly without any detours? Hermes offers excellent performance on this
band too.

73, Helmut, DC6NY  

-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Justin
Giles-Clark
Gesendet: Sonntag, 25. September 2016 14:23
An: hpsdr at lists.openhpsdr.org
Betreff: [hpsdr] PowerSDR Transverter Setup Query

***** High Performance Software Defined Radio Discussion List *****

Greetings All,

     I am using PowerSDR V3.3.9 controlling a Hermes board and have a 
630m transverter that mixes down to 1.802-1.809 to cover 472-479kHz 
(-1.33MHz offset).

In the XVTR setup screen I have setup the LO Offset to -1.3MHz and LO 
Error to -30.000kHz for a Begin Freq of 0.472000MHz and End Freq of 
0.479000MHz.

The transverter is designed for rigs that don't have the 630m band 
available but have 160m band.

My question is does the XVTR Setup allow for negative offsets? This is 
the reverse to normal transverters that mix up and have positive offsets.

I have tested and it doesn't appear to work.

Any thoughts?

73, Justin, VK7TW


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