[AMRadio] dds information


Jim candela jcandela at prodigy.net
Fri Jul 16 18:57:00 EDT 2004


	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: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net]On 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:jim at buddytone.com]
> 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: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On 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
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