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Re: DDS VFO!
Bob, I was responding to Gary WB6OGD when he said "On the other hand if you are adding a VFO to a NC-40 I don't know why...? the NC-40 is amazingly stable and usable." He says he doesn't know why one
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Michael N6MST
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#32
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Re: DDS VFO!
DXpeditions and DX in general sometimes hang out down there.
I like the Novice band
Frequency agility is a nice thing to have
But a DDS VFO that covers everything very inexpensively and very
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Michael N6MST
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#31
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Re: DDS VFO!
You could replace the crystal filter with a LC filter if you want wider BW.
And you can build this basic design with a single crystal at the expense of wider skirts on the IF filter. But you might be
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Bob Macklin <macklinbob@...>
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#30
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Re: DDS VFO!
That wouldn't be a problem using a DDS VFO.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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Bob Macklin <macklinbob@...>
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#29
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Re: DDS VFO!
My NC-40 (homebrew copy) tunes 7014-7066.? Below that they go too fast for me, above that is only
the digital modes and the novice band.? NC-40 filter is too narrow for SSB (though I have listened
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wb6ogd
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#28
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Re: DDS VFO!
7000 kHz to 7300 kHz? My Wilderness NC40A only covers about 40 kHz.
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Michael N6MST
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#27
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Re: DDS VFO!
What do you mean by "FULL BAND COVERAGE"?
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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Bob Macklin <macklinbob@...>
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#26
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Re: DDS VFO!
There is no reason the 49er VFO could not be made to work with any of the NorCal transceivers. I have several NorCal40 boards and the boards for a NorCal Sierra.
I have suggested to Jack that he make
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Bob Macklin <macklinbob@...>
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#25
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Re: Do you have a favorite home brew short wave receiver to build with scouts?
Here is the link - http://iq-technologies.net/projects/rf/007/index.html
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Henrik Stenstrom
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#24
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Re: DDS VFO!
Full band coverage would be nice.
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Michael N6MST
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#23
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Re: DDS VFO!
The Si5351 solution is very good.
Cost (from ebay, including shipping) estimate:
Si5351 board?? $4
Arduino??????????? $3
LCD???????????????????
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wb6ogd
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#22
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Re: Do you have a favorite home brew short wave receiver to build with scouts?
Hi there,
If you¡¯re willing to go to the FM broadcast band, a search for ¡°The Radioshack Special¡± will turn up an interesting superregenerative circuit with ?one active device and a LM386.
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Henrik Stenstrom
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#21
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Re: DDS VFO!
Are you talking about the Jack Purdum / Farrukh Zia board? If so Jack mentioned in the SoftwareControlledHamRadio group that there are lots of boards out there based on their design. Might be worth
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Michael N6MST
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#20
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Re: DDS VFO!
Arduino (uno or nano) , SI5351(many sources), 2 line by 16 char LCD(many many sources).
That will do it all very acceptable and the code to do that is out there.? Its good
to VHF.
The ad9850 is a
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ajparent1/kb1gmx
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#19
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Re: DDS VFO!
Hi
Differences among other things:
- A DDS is way faster than a synthesizer
- A DDS has, often, better frequency resolution
This being said if the choice is between an AD9850 and the Si5351A I will
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Bo, OZ2M
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#18
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Re: DDS VFO!
Why does that matter? It accomplishes the same thing if you use the digital
output of the 9850.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
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Bob Macklin <macklinbob@...>
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#17
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Re: DDS VFO!
If you can find a 49er VFO you could use that.
I don't like the QRP Labs VFO because the serial port is not available and it uses a parallels.
Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The
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Bob Macklin <macklinbob@...>
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#16
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Re: DDS VFO!
The design is for either the QRP Labs SI 5351 module or the AD9850 Type I module.I am planning firmware for both.
I use serial LCDs. I use Newhaven LCD modules. If I must use a parallel LCD I use a
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Bob Macklin <macklinbob@...>
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#15
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Re: DDS VFO!
Hi
Please not that the Si5351A is not a DDS. It is a synthesizer. BIG technological difference.
Bo
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Bo, OZ2M
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#14
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Re: DDS VFO!
I have qrp-tech boards that need building, a DDS VFO would be great!
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Michael N6MST
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#13
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