Hi all, After that,the PIC of DDS was broken suddenly. I changed that and I can see the spurious@7040KHz is almost gone! Any very small spurious can be seen...
Good Morning Franco, Your built/tested QSD kit, Low Band OSC/BPF kit and High Band OSC/BPF kit were shipped on 12/29/05 in a padded envelope. Please let me...
Hi Hidehiko, The RC product in the phase shift network, R25*C25, should be about equal to the period of the lowest frequency in the band of frequencies you...
Joe, Think about it the dds phase modulation is not stable it jerks around as the dac dumps out samples. Driving a dds into logic gate or comparator to square...
... Hi Francis, thank you for your kind comments. It's nice the way that KGKSDR has come on over the last couple of weeks, but there have been quite a few...
Bill and group, A fellow named Brian Davis has put together a very interesting document on spur pile-up in the DDS. If your interested in some of the dirty ...
Francis, There are only two things that can cause new spectral components to developed around a desired signal: amplitude modulation and phase modulation....
Cash, Thanks for your info. I find that the DDS is not clean. I will study more in this new year holidays. I wish to express my gratitude for introducing...
Thanks Joe, Da the anti-alias, I forgot all that crud landed in the filter. My error was thinking the spurs changed over 360 degrees depending on the D/A level...
Now I have my DDS-60 built and running I have changed the Java GUI to better support the DDS. When the DDS is enabled the usual dropdown selection for the the...
... Bill, if you go to the page I referred to in my message, that is: http://www.radioamatore.it/i0cg/add9951.html at the end of the page you will find this...
In response to a few issues with build 21, build 22 has just been uploaded to the website at http://www.m0kgk.co.uk/sdr/ Key changes are: FIXED: Problem with...
Joe, Why does the SR5 have spur problems while SR4 does not? The SR4 has to run at X4 Fo so you would think the spurs would be worse. Since my thought was...
No one has mentioned this but for several versions the 24 bit selection on the setup is grayed out, so if you move it to 16 bits you cant ever get it back to...
Frank, You asked: "Why does the SR5 have spur problems while SR4 does not? The SR4 has to run at X4 Fo so you would think the spurs would be worse. Since my...
... Hi Cecil, There has never been any code in the software to process 24 bit input and output, so not being able to select it shouldn't cause any big loss :-)...
OK, any idea when 24 bit will be supported? Here is something else to consider. The RIT and the CW center frequency do not affect the frequency readout, they...
Hi Cecil, ... Don't know is the honest answer, as I don't have any hardware here that provides a 24 bit output through windows. What card did you have in...
... If you have a Delta 44, you can use its ASIO drivers to get 24 bit sampling under Windows. I know for sure, as I have done it for my yet-to-be-released ...
... The frequency displays on my IC 7561A and IC-781 do not change when the RIT/XIT is changed. The Frequency Delta is displayed. 73 de Lee KM4YY/8 ... From:...
I have a Delta-44, I though you had one also. An inexpensive one is the SB Live 24 it's about $30. The authors of FlexSDR, Rocky, and SDRadio software support...
Joe, the sr4 had a divide by 4 to get i/q lo while I think the sr5 uses lc circuits to generate a delayed lo. I have not seen the sr5 schematic yet but just...
Frank, Thanks, but most of that means nothing to me. What is an SR4? What is an SR5? Joe W3JDR ... From: FRANCIS CARCIA To: softrock40@yahoogroups.com Sent:...
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