[AMRadio] dds information


Neal Newman groucho at skyweb.net
Fri Jul 16 15:30:34 EDT 2004


 Jim Do you have a website up?
I run a few broadcast transmitters on 160 Meters AM.... looking for a 
crystal replacement to change Frequencys On 160 meters..  any plans on a 
VFO for these type Rigs?
Neal Newman-KA2CAF
Big Iron  collector
http://www.angelfire.com/nj4/wttm/rca.html

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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