Wondering if a FM encode/decode has been developed - most the folks on 144 use FM for casual comms and SSB for serious stuff
73, Ray, N0FY SKCC 3704 FH 997 _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Terry Sent: Thursday, May 08, 2008 4:32 PM To: [email protected] Subject: [softrock40] Re: softrock for 2m? --- In [EMAIL PROTECTED] <mailto:softrock40%40yahoogroups.com> ups.com, Matt Patterson <[EMAIL PROTECTED]> wrote: > > > I know you could use a 10m softrock and a transverter to get on 2m SSB > but I was curious what would be the feasability of actually designing a > softrock for the 2m band. > > 73 Matt > W5LL > The QSD switches typically don't go that high. Plus, its harder to find a low phase-noise LO that high. But, I just tried a Brainerd 995X receiver board at 144.000MHz with 1/3 subsampling (the 995X board is tuned to 48MHz). The MDS is around - 110dBm. There are quite a few spurs, but my board is sitting out in the open on the bench. Absolutely no shielding or filtering being used. Using 1/5 subsampling (QSD tuned to 28.8MHz) the MDS is around - 100dBm. There are fewer spurs & artifacts there. So, it's possible. Downconverting to around 30MHz is probably a better choice. Terry WB4JFI
