Hank: I only had a chance to take a quick look at the schematic. It appears that there is a thru position in the bandpass circuit that selects bandpass filter. You should be able to use that below 2.1 MHz, but could see harmonic responses. You could also modify on of the other filters to cover below 2.1 MHz. The frequency control is an AD9834, which should go down to audio without problem.
Dave - WB6DHW <http://wb6dhw.com> hank smith wrote: > Hello I ordered mine all ready built > he is not answering my questions either > I don't think this can even go below 2.1 mhz either > is your kis all ready built? > I am visually impaired and am unable to sodder at this point. am reading > articles on how to sodder but at this point don't know how to yet > Hank > ----- Original Message ----- > From: "larryw8er" <[email protected]> > To: <[email protected]> > Sent: Monday, January 25, 2010 9:12 PM > Subject: [soft_radio] Re: LD-1 Discussion on Garage-shoppe.com Blog > > > >> Peter ... The Soft66AD is assembled and shipped at $122. The problems are >> with support and documentation and drivers/software. My experience is that >> emails are often not answered and telephone contact is not possible and >> supplied drivers/software are weak, at best, for WinRad, not supplied. As >> for documentation, go to his website. The LD-1 appears to be a bargain at >> $200. I received mine today and will put it through it's paces tomorrow. >> May order a second one while still at $150. >> >> --- In [email protected], "ni9n" <peg...@...> wrote: >> >>> Hank, the price goes up to $200 in about a week and a half. I think it's >>> worth that. I see that the Soft66AD costs $125, plus shipping from >>> Japan, but you have to put it together yourself. If you do that, I would >>> advise you to use better surface-mount techniques than the ones >>> recommended on the Soft66 website. Never, ever use a soldering iron. I >>> like to use an electric griddle as a hot plate, along with a Weller >>> butane soldering iron with a hot air blower tip. Monitor the temperature >>> using an IR thermometer from Harbor Freight tools. I've described some >>> techniques that work well on my blog, but nothing beats using a solder >>> stencil. >>> >>> The LD-1 works quite well down to about 1 KHz, and does work at lower >>> frequencies but with some spurious responses due to the low LO frequency. >>> That could be fixed by changing the filter bands, and I might consider >>> offering that as an option. I can't quite tell from the Soft66AD docs >>> exactly what the frequency coverage is, he seems to make some claims that >>> don't add up, but his english makes it hard to tell. >>> >>> I do use the AD9834, the same DDS chip that he does, but I actually use >>> two of them. Both are programmed for the same frequency, but one is >>> programmed for a 90 degree phase shift relative to the other. Start them >>> at the same time, and you have an I / Q LO. Also, I've found a simple >>> technique to greatly reduce the spurs from the DDS chips. I'm keeping it >>> close to the vest, but it works. >>> >>> Modes like DRM are a function of the SDR host software you run on your >>> PC. Rocky does not do DRM, but Winrad does. Whatever radio you decide >>> to use, take a look at Winrad. >>> >>> >>> --- In [email protected], "hank smith" <hanksmith5@> wrote: >>> >>>> will my softadh cover these same frequencies? >>>> also what is the normal price after your introduction? >>>> Hank >>>> ----- Original Message ----- >>>> From: "ni9n" <pegood@> >>>> To: <[email protected]> >>>> Sent: Saturday, January 23, 2010 6:11 PM >>>> Subject: [soft_radio] LD-1 Discussion on Garage-shoppe.com Blog >>>> >>>> >>>> >>>>> Thanks to those who have placed orders for or expressed interest in >>>>> the >>>>> LD-1 software defined receiver, which I am now shipping. Two of the >>>>> first >>>>> lot of five are still available (I will be assembling them in the >>>>> morning, >>>>> so they don't show up as in stock yet) and I have just ordered parts >>>>> for >>>>> the second lot. Those should be ready to ship later in the week. >>>>> >>>>> To recap the LD-1's features (which are fully described at >>>>> www.lazydogengineering.com/LD1home.htm ) it is a soundcard-based SDR >>>>> like >>>>> the Softrock-40 and similar SDR's, but with a dual-DDS local >>>>> oscillator >>>>> using two Analog Devices AD9834 DDS chips. It will cover the entire >>>>> 530 >>>>> kHz to 30+ MHz range. On the low end it will probably work below 530 >>>>> kHz, >>>>> but I haven't tested it there. It may go as high as 37 MHz, but I >>>>> haven't >>>>> tried that, eiter. It is USB controlled, either from Winrad or from >>>>> its >>>>> own stand-alone application. While I haven't done any formal >>>>> performance >>>>> measurements, it seems very comparable to my FT-817. Except, of >>>>> course, >>>>> being an SDR it runs rings around any conventional receiver when it >>>>> comes >>>>> to operator convenience and agility. >>>>> >>>>> I don't want to distract from the main topic of this discussion >>>>> group, so >>>>> I would like to encourage anyone who is interested in the LD-1, or >>>>> DIY >>>>> surface-mount projects, small-scale product developement, ham radio >>>>> entrepreneurship, etc. to visit my blog at www.garage-shoppe.com. >>>>> >>>>> >>>>> >>>>> ------------------------------------ >>>>> >>>>> Yahoo! Groups Links >>>>> >>>>> >>>>> >>>>> >> >> >> ------------------------------------ >> >> Yahoo! Groups Links >> >> >> >> > > > >
