6112Re: [softrock40] Use of DDS-60
- Sep 18, 2006Hi Ian,
I have built up 3 DDS-60s using just a small 18 watt iron with the
smallest tip I could find (from Maplin).
I used the method of putting a small amount of solder on the pad for pin
1 and then positioning the ad9851 and then just touched pin 1 to flow
the solder. After checking the alignment I then solder the opposite
corner pin, recheck everything and then put a small amount of solder on
the tip and drag the tip slowly across the pins of one side. I then use
solder wick to clean it up and remove any bridges. Then repeat for the
other 3 sides.
I am in the process of building another DDS using the ad9951 and have
used the same method with that.
ian mcphedran wrote On 09/18/06 17:53,:
> Hi Tom, I am trying to build a dds-60 using a 230v Hexacon SMD--
> soldering iron I bought in the U.K. from a supplier of SMD parts who
> no longer is in business. The tip is o.k. for most smd things but the
> 28 pin analog devices chip is too closely spaced for it. Can I ask
> what is the iron you used for your assembly work?
> Ian Gm3GTQ
> */km5h <km5h@...>/* wrote:
> I finally finished a "production" version of a Softrock receiver. By
> production, I mean everything in one box with proper connectors
> instead of a bunch of pieces scattered around the bench. In the box
> is a SR-6, a DDS-60 and a MS-DDS-60 (Controller).
> I am using a SoundBlaster MP3+ so I can use it with any computer with
> USB (especially laptop).
> The Rocky display looks the same with the DDS-60 or the 28.224
> crystal. The output of the DDS-60 directly replaces the crystal via a
> short piece of small coax.
> One of the nice features of the controller is that it displays 7.056
> but actually puts out 28.224 for the SR-6.
> You set the center frequency on the controller. Then transfer that
> number (like 7.056) on the display to the appropriate field in Rocky
> The DDS-60 goes to 60MHZ so this configuration will work to 15 MHZ.
> This includes lots of ham bands, short wave bands, and most IF's. Now
> I need to do some work on switching the band pass filter for higher
> frequency coverage than the "stock" SR-6.
> Now, if Rocky only supported AM and maybe FM (hint hint).
> There have been several questions lately about the use of the DDS60.
> I have found it very successful.
> Tom KM5H
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> "The new Interface is stunning in its simplicity and ease of use." -
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