[Milsurplus] [ARC5] AD9850 DDS Freq. Syth Module

George Maier george at maiergroup.com
Fri Mar 22 15:25:07 EDT 2013


Sorry for jumping into the middle of this, but it's quite an interesting
thread and probably the best place to get some opinions.  OK, so I was
wondering if anyone has used the Cumbria X-Lock circuit in any of the BC-4XX
or other Mil radios to stabilize what's already there in the first place. 

 

http://www.cumbriadesigns.co.uk/x-lock.htm

 

This is being talked about by a bunch of us that typically use BC-458's as
VFO's for Central Electronics SSB exciters.  Integration looks fairly
simple, but requires cleaning up the inherent BC-458 drift as much as
possible with new passive components, and the strategic addition of a
varactor diode in the VFO to apply the correction voltage from the X-Lock. 

 

Tnx es 73,

 

George - W1LSB

 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
mstangelo at comcast.net
Sent: Thursday, March 21, 2013 1:17 PM
To: David Stinson
Cc: boatanchors at theporch.com; boatanchors at mailman.qth.net; ARC-5 List;
milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] [ARC5] AD9850 DDS Freq. Syth Module

 

Dave,

 

I have used these AD9850 boards with this controller:

 

< <http://www.pongrance.com/DDS-9850.html>
http://www.pongrance.com/DDS-9850.html>

 

You have to build this board but it has thru hole devices so you don't have
to worry about working with SMT devices.

 

It gives you the ability to generate 64 fixed output "channels" but does not
have a tune up/donn or vfo capability.

 

If you prefer having the ability of tuning up and down and you don't want to
spend the time building a kit I would check out this AD9851 DDS board:

 

<
<http://www.ebay.com/itm/New-AD9851-DDS-Function-Signal-Generator-0-50MHz-DD
S-signal-source-DDS-Module-/221189853728?pt=LH_DefaultDomain_0&hash=item337f
f15220>
http://www.ebay.com/itm/New-AD9851-DDS-Function-Signal-Generator-0-50MHz-DDS
-signal-source-DDS-Module-/221189853728?pt=LH_DefaultDomain_0&hash=item337ff
15220>

 

If you want a vfo capability as well as channelized I'd check out K5BCQ's
Si570 Controller and Frequency Generator (Kit #2). It's the best of the lot
but you have to mouny SMD devices and it output's a square wave so,
depending on your application, you have have to place a low pass filter on
the output.

 

I've use's all three and prefer thet last one.

 

I use them to control the frequency of my vintage solid state radios but it
should work well with the appropriate buffer to drive hollow state radios.

 

Have fun,

 

Mike N2MS

 

 

 

----- Original Message -----

From: David Stinson < <mailto:arc5 at ix.netcom.com> arc5 at ix.netcom.com>

To:  <mailto:milsurplus at mailman.qth.net> milsurplus at mailman.qth.net,
<mailto:boatanchors at theporch.com> boatanchors at theporch.com,
<mailto:boatanchors at mailman.qth.net> boatanchors at mailman.qth.net, ARC-5 List
< <mailto:arc5 at mailman.qth.net> arc5 at mailman.qth.net>

Sent: Thu, 21 Mar 2013 14:41:15 -0000 (UTC)

Subject: [Milsurplus] AD9850 DDS Freq. Syth Module

 

Has anyone here actually used one of these DDS modules in a way that can be
duplicated without renting a full-up surface-mount factory for a few hours?

Haven't found much useful on Google:

 

 <http://cgi.ebay.com/ws/140776695890> http://cgi.ebay.com/ws/140776695890

 

If I have to etch a board and add 500 ittsy-bittsy parts and tag-on a PC
through a $200 interface, I pass.

I'll stick with the $5 programmable oscillators.

 

73 Dave S.

 

 

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