Feel free to add information to the wiki or make edits as needed. Please respect the work of others by adding your own content rather than editing or removing someone else's content unless doing things like updating URL's etc.?
|
Re: DDS VFO!
I built my NC-40A about a year ago. One of the nice things about the rig is its VFO. I set mine up for 7015 to 7047 kHz. A bit limited in that it doesn't cover the activity around 7112 to 7123, but
By
Nick Kennedy
·
#50
·
|
|
Re: DDS VFO!
What is wrong with the old novice band?? I frequently listen there. Because it is there...errr because I can. There was some comment that a DDS vfo has a pretty low upper frequency but the AD985x
By
Jim Pruitt WA7DUY
·
#49
·
|
|
Re: Group Introduction: If you're going to post on the group, reply here!
Hi, I don¡¯t post much (or ever!) but I do lurk daily and usually learn something in the process. Thanks for carrying the flag! Newt N4EWT
By
Newt N4EWT
·
#48
·
|
|
Re: DDS VFO!
Hi Some but not all Arduinos can count up to 6,4 MHz, i.e. 40% of clock frequency. Empiric data shows a bit higher, ~43%. The Arduino Zero can count up to 90 MHz e.g. as implemented in the RFzero:
By
Bo, OZ2M
·
#47
·
|
|
Re: DDS VFO!
You can put a divide by 10 in front of the 328 counter input and go higher in frequency if you want. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"
By
Bob Macklin <macklinbob@...>
·
#46
·
|
|
Re: DDS VFO!
Arduinos can count to 6.4MHz so Digital dial for a NC-40 is a piece of cake. Resolution to the Hz, accuracy depends on calibration and temp/voltage variation. You COULD GPS discipline it for real
By
wb6ogd
·
#45
·
|
|
Re: DDS VFO!
How about digital tuning accuracy? I have several GOOD HF receivers with analog tuning and they do not have precision readouts. Only good to about 25KHz. There was a digital display for the NorCal
By
Bob Macklin <macklinbob@...>
·
#44
·
|
|
Re: DDS VFO!
And... Though I don't see the need to add a DDS VFO to a NC-40, my own NC-40 does have an Arduino add-on. It functions as: AFA? audio frequency annunciator (in CW) Iambic keyer Keyboard CW sender CW
By
wb6ogd
·
#43
·
|
|
Re: DDS VFO!
Ok guys.? Sometimes a project is worth doing just because its there! An Si5351 VFO is a really good project just to have around so GO DO IT! If you need any help with Arduino coding let me know. 73,
By
wb6ogd
·
#42
·
|
|
Re: Group Introduction: If you're going to post on the group, reply here!
That is my hope as well! -- Ryan Flowers W7RLF https://miscdotgeek.com
By
Ryan Flowers
·
#41
·
|
|
Re: Group Introduction: If you're going to post on the group, reply here!
Thanks for creating this new space. I learned a lot from the old QRP-tech group and I am hoping this learning will continue here. Karl Heinz - K5KHK
By
Karl Heinz Kremer - K5KHK
·
#40
·
|
|
Re: DDS VFO!
BTW: Above 7125 is PHONE space. No one looks for CW between 7125 and 7300. The only time I hear phone activity on 40M is during contests. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"
By
Bob Macklin <macklinbob@...>
·
#39
·
|
|
Re: DDS VFO!
I want the DDS so I can have CAT control. Currently I use CW Get and CW Type for CW operation. I'm 85 years old and my hands don't work very well anymore. They are not the only things that don't work
By
Bob Macklin <macklinbob@...>
·
#38
·
|
|
Re: DDS VFO!
Hi Allison, That is an acceptable price to pay, for me at least!
By
Michael N6MST
·
#37
·
|
|
Re: Group Introduction: If you're going to post on the group, reply here!
Hi all, I like tube technology and building my own things, despite all the people who ask why I don't just go buy something instead. A lot of people on the internet want their hands stapled to their
By
Jon Edwards
·
#36
·
|
|
Re: DDS VFO!
Mike, The cost of a DDS VFO is about 130ma of additional power consumption over the VFO version than can run on small battery for a long time. Allison
By
ajparent1/kb1gmx
·
#35
·
|
|
Re: DDS VFO!
"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 able to do RTTY with 170Hz shift." OK a few things the filter in there can
By
ajparent1/kb1gmx
·
#34
·
|
|
Group Introduction: If you're going to post on the group, reply here!
Hello everyone, Thank you for joining this group! I am new to being an admin of a groups.io group, but not to groups in general. If you see something that needs to be changed, feel free to comment
By
Ryan Flowers
·
#33
·
|
|
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
By
Michael N6MST
·
#32
·
|
|
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
By
Michael N6MST
·
#31
·
|