[hpsdr] PowerSDR Transverter Setup Query

[Justin Giles-Clark]

Thanks Helmet,

What I suspected.

I already use the HPSDR natively on 630m.

I have been asked to review a transverter and wondered if I could set it up under the XVTR in powersdr.

I will revert to the FT847.

Thanks for the response.

73, Justin, VK7TW


> On 26 Sep 2016, at 00:14, Helmut <dc6ny at gmx.de> wrote:
> 
> 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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