Brian, In the Email from James below he has available 1, 2, and 10 Mhz spans when the top end cannot be higher than 14.5 Mhz. I picked 2.5 to 12.5 for my 20a project. Of course you can also pick the usual SSB 5-5.5 range and beat that against a series of rocks for the bands you'd like to cover. Hey the sidebanders do that, why can't we?
Regards, Jim -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Brian Carling Sent: Friday, July 16, 2004 5:16 PM To: Discussion of AM Radio Subject: RE: [AMRadio] dds information How do you get one programmed to cover a wider range of frequencies than just one band? I would like to get one that would generate from 1.8 to 12 MHz I already have an AD9850 chip here. On 16 Jul 2004 at 13:52, Jim candela wrote: > Bill, > > Below is the scoop on the WA1FFL version. His email address is listed > there > at the top. Sure would be nice to have some clean sounding AM rigs on > the air that are also not drifting! This might be perfect for a Class > E solid state rig, as well as some boat-anchors. > > This unit will also power up at the minimum frequency like Don was > saying about his unit. A more sophisticated micro-controller, or > computer interface is needed for more "bells and whistles". For me, a > plain-Jane DDS VFO is my goal. > > Regards, > Jim > > > -----Original Message----- > From: James Hagerty [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 25, 2004 7:57 PM > To: Candela, Jim > Subject: Re: Compact DDS VFO Information Request > > > I still have plenty of boards and parts. Nice to hear from a new > reader. My "kit" is a partial one with the hard-to-get components > only. A programmed microprocessor is included. Note: R1, R8, and R9 > are 1/4 watt, not 1/2 watt as stated in the parts list. Parts Kit > Information: To make the VFO as affordable and simple as possible to > build, I am offering a partial parts kit that includes the following: > 1. High-quality, commercial-grade p.c. board with the AD9835 DDS > surface-mount chip already soldered on (professionally done, not by > me!) > 2. Output op amp (AD811AN) > 3. Microprocessor programmed for your band of choice, including > socket. > This kit is available for a cost of $35.00 plus $5.00 shipping and > handling (overseas orders add $2.00, with payment with a bank check > for U.S.Dollars). The bands available as of today are: > a. 3.5-4.0 MHz. > b. 7.0-7.5 MHz. > c. 5.5-5.0 MHz. (reverse tuning for local-oscillator operation); > 5.0-5.5 MHz. also available > d. 10.0-10.5 MHz. > e. 14.0-14.5 MHz. > f. 1.8-2.3 MHz (160 meters +) > The display reads 000.000-500.000 kHz for all of these band choices. > I also just finished a VFO with a 1 or a 10 MHz. tuning span (up to > 14.5 MHz). I also have a 2 MHz span version. > > ***I strongly advise using some filtering at the output of the VFO. If > you do not have a copy of the W7ZOI/K5IRK receiver article (which > contains some very nice lowpass/bandpass filter info) I can supply a > copy of the filter design data.I also have a CQ article by Doug DeMaw > regarding the use of solid-state VFOs with older vacuum-tube rigs, > which may be of interest to you. ***In addition to the above, I am > offering limited quantities of the following: Industrial-grade, > p.c.-mount BNC connectors for $7.00 each (made by Trompeter) and I > have one shaft encoder for $22.00. > All of the other parts are available from sources like Digi-Key, > Mouser > Electronics, and All-Electronics. The latter has very nice surplus > displays for under $10.00. Anything by Optrex or Varitronix should > work. > My parts kit has only the premium parts which builders would have > trouble getting in small quantities. Selling the kit this way saves > the builder a lot by giving him the flexibility for choosing displays > and enclosures, output connectors, using junk box parts, etc. and it > prevents me from having to stock several thousand dollars worth of > parts. > > ***Please make all checks out to: James Hagerty. > My address is: 64 Nonquit Lane, Tiverton, R.I. 02878, U.S.A. I am > also including a short assembly and applications ideas guide > along > with the premium parts kit. It's about 3 pages. I have built 6 boards > and I had no trouble whatsoever getting any of them working. > 73, Jim WA1FFL > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of BILL WINTER > Sent: Friday, July 16, 2004 1:09 PM > To: amradio > Subject: [AMRadio] dds information > > > where can one obtain pre-programed cpu chips for either (or both) the > wa1ffl or the kg6cyn dds devices? I can handle everything else. Bill > ______________________________________________________________ AMRadio > mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html Post: > mailto:AMRadio@mailman.qth.net --- Incoming mail is certified Virus > Free. 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