[AMRadio] dds information

Jim candela jcandela at prodigy.net
Fri Jul 16 14:52:01 EDT 2004


	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


-----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.
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