[hpsdr] Mercury as VHF Receiver

[Gregory W. Ratcliff]

Helmut,

Often wondered the same myself.  I also thought that undersampling of narrowband FM or AM in this spectrum 140-166 would be handy for many uses (airband, amateur, etc)....which then took me toward the FM broadcast band also (is 88-108 too close to the LO?).

Greg
nz8r






>________________________________
> From: "Helmut, DC6NY" <dc6ny at gmx.de>
>To: hpsdr at lists.openhpsdr.org 
>Sent: Wednesday, July 31, 2013 10:31 AM
>Subject: [hpsdr] Mercury as VHF Receiver
>  
>
>***** High Performance Software Defined Radio Discussion List *****
>
>Hi ,
>
>I did some tests with undersampling: For this purpose I bypassed the
>antialiasing LP on one of my Mercuries and added an external helical BP
>together with a low noise high OIP3 preamp. Selecting 122,9 MHz LO offset
>plus error correction in the XVTR settings the entire 2m band can be
>perfectly received. Stop-band attenuation in this preliminary experiment was
>only around 80 dB, but can be certainly improved.
>Moreover I think it makes sense to generate possibly the 2m-TX-signal with a
>simple analog up-converter to get a complete 2m TRX without the classic
>transverter configuration.
>
>Comments and suggestions are welcome.
>
>73, Helmut, DC6NY
>
>_______________________________________________
>HPSDR Discussion List
>To post msg: hpsdr at openhpsdr.org
>Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>HPSDR web page: http://openhpsdr.org
>Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
>
>    
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20130731/35494f09/attachment-0003.htm>