That's a good question but impossible to answer from this distance. I'm using A DDS60 which does directly ground pin 22 and I think others are as well, and it does work fine. So I have to shrug. 73- N

No, there's no need for any modificaton. The code pulses the RESET line, which might be of benefit for systems with hardware that have it wired. Although holding that line LOW would probably work just

I got an emailfrom Garey K4OAH asking how I got such good ultimate attenuation on my 500 Hzfilter plot on the PHSNA site. It showsgoing all the way to -80 dBm. I hadn’tnoticed this before and had to q

If it's moving around, I do think grounding it would be a good idea. 73- Nick, WA5BDU

If they aren't connected, it *probably* doesn't matter. It's an active HIGH reset, so a question would be whether it might float high if not connected. I doubt it, since there a couple of test / evalu

Yes, the DDS will start up near 7.040 MHz if no connection to the Windows software has been made. 73- Nick, WA5BDU Nick will need to confirm this... I'm not sure, with the Windows firmware running on

Hello Pravin- I'll make a couple of comments before Jim responds. If you don't see RF with a sensitive diode detector or on a frequency counter, your DDS might not be working properly. It might be use

The first change since August 27th! And this month is PHSNA's 1st birthday (meaning the Windows version). This is a fairly minor change. One user who shall remain nameless but his call is N5IB, reques

I was recently discussing problems N1VC was having with PHSNA - Windows version and I mentioned that his parameters.txt file didn't have linefeeds in part of the file. Actually, a text file usually en

Nice. It's good to see some results after all that building. Now, try zooming in on the bandpass region by doing a response from 2 to 6 MHz or so. You don't have to put a filename in the box -- just c

The dipper thing looks nice. Good sharp peaks. It got me to thinking about an article called "Beyond the Dipper" by Wes Hayward in the May 1986 QST. He showed a resonance indicating probe you can conn

Hi Vince -- If you like you could send your Excel sheet of wide sweep data that you used to determine your coefficients to me at kennnick@... and I can goof around with it and see if I find any

Speaking of alternate approaches, there's an interesting and fairly simple technique for measuring both R and the absolute value of X. I don't think it's anything new but I don't see it discussed much

OK, I posted the library in the Files area under the WA5BDU folder. Thanks / 73- Nick, WA5BDU

Jim, I bought ten of the eBay AD8307s some time back and did use one in my PHSNA. I don't have detailed measurements or comparisons but it seemed to work like the real thing for me. Not derailing your

I've allowed myself to get swept up in the Si5351a synthesizer mania a bit. Poking around, I landed on AK2B's blog ... AK2B: Si5351 Arduino VFO breadboarded AK2B: Si5351 Arduino VFO breadboarded This

I got rid of all the .exe and .ino files that aren't needed. I think there's a good reason to leave the old versions for a short time, in case there's an unforeseen bug or incompatibility with a certa

First, I made a slight revision to the Windows version User's Guide which is now called "PHSNA User's Guide 1r35a.PDF". This document includes a discussion of which source files must be compiled and s

Hello Pravin, As I recall, you just put both files in the same folder and the Arduino IDE will compile them both into one hex file for the Nano. The folder has the same name as your "main" file and co

I forgot to answer the question about the latest revision. I checked the PHSNA site and see that V1r2 is marked "archival" and says to use the two files PHSNA_VB.ino and Morse.ino. Those are the lates