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DDS VFO Help

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DDS VFO Help

Postby 4S7LF » Sun Oct 19, 2014 1:43 pm

Dear Ham Radio India ,

I am a Ham operator from Srilanka.
I am interesting to build the DDS VFO built by an Indian ham, Its is very difficult to buy the components here in Srilanka, therefor I will be very much obliged to any one who can help me to buy all the necessary components.
Can any one help me please! Please send me a mail to oz6zv@yahoo.com
Kind Regards 73!
Leonard Fernando.
4S7LF
4S7LF
 
Posts: 2
Joined: Sun Oct 31, 2010 4:35 am

Re: DDS VFO Help

Postby mvs sarma » Sun Oct 19, 2014 2:37 pm

4S7LF wrote:Dear Ham Radio India ,

I am a Ham operator from Srilanka.
I am interesting to build the DDS VFO built by an Indian ham, Its is very difficult to buy the components here in Srilanka, therefor I will be very much obliged to any one who can help me to buy all the necessary components.
Can any one help me please! Please send me a mail to oz6zv@yahoo.com
Kind Regards 73!
Leonard Fernando.
4S7LF


I suppose you can buy the dds module from ebay paying around $10/-
a two row pins module. later you can well use the pcb design by YC3TKM as indicated at [url]pcb.hamradio.in[/url] it would simplify the work rather than assembling the whole dds chip etc.the ebay link that i bought is here

http://www.ebay.com/itm/New-DDS-AD9850- ... 5d36385840

all the best
Regards
Sarma
mvs sarma
 
Posts: 638
Joined: Wed Oct 11, 2006 4:57 pm
Location: Hyderabad, India

Re: DDS VFO Help

Postby 4S7LF » Sun Oct 19, 2014 5:00 pm

Dear Sarma,

Many thanks for the help. I am looking for a DDS with a frequency with around 60 MHz. I want to use it for a VHF surplus Storno unit which has to have 12 MHz range for TX and 50 MHz range for receiving. (Oscillator range and TX multiplication range)

Any way I really appreciated the kind help!

Kind Regards!
Leonard.
4S7LF
4S7LF
 
Posts: 2
Joined: Sun Oct 31, 2010 4:35 am

Re: DDS VFO Help

Postby mvs sarma » Sun Oct 19, 2014 5:31 pm

perhaps then you need to use AD9851which can go upto 40% of ref clock of 180MHz (6 times 30MHz with an internal multiplier)
there are also other devices that output higher frequencies like SI570, perhaps costly.
Even in analog devices range, there are VHF supported DDS chips but costly
Regards
Sarma
mvs sarma
 
Posts: 638
Joined: Wed Oct 11, 2006 4:57 pm
Location: Hyderabad, India


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