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Finally got the VFO going. First off a big thank you Jack and Farrukh for posting the warning in multiple places about adjusting the buck boost regulator prior to installing the Arduino and AD9850. Mine was set to 11.8v which would have meant the smoke would have leaked out instantly. Had a minor issue with compiling the VFO source code. Not a big deal and it is documented in the Upgrading Displays to I2C thread. Once the unit booted I played with the rotary encoder and it was acting all weird. In another thread here it discusses where to plug in the wires and of course I screwed that all up. Will fix it when I get back to the bench. While I'm at it install debounce capacitors to the encoder. Could do it in software but just as easy to solder in a couple of caps. Hooked up the oscilloscope. Adjusted the amplified wave to 4vpp. Went to measure the frequency and got 7.062mhz with an indicated 7.000. Granted measuring with an oscilloscope isn't the most accurate instrument for this purpose. Also I had just finished soldering the thing together not 30 minutes prior so several of the components were heat soaked. Will let the thing cool and come back to it. Let it run about 30 minutes and it was still clicking along. Rechecked the amplified wave and it had drifted to 4.2vpp. Tweaked that down. Will check it again once it cools. My next bench session besides tweaking and adjusting things here and there I want to let it run for an hour and let everything get to operating temperature. Definitely want to check the buck boost regulator to see if it drifts once it warms up. Anyhow, happy day in the shack. Till later Hank K5HDE

Thanks to the authors, my 49er with DDS vfo is now Alive. Working perfectly!! I don't have it in a case yet, I need to work on that, but all the smoke stayed in the tiny components :) The receive seems very strong. I think I might add a volume control and maybe RIT, not sure if anyone has done an RIT mod yet.

I am building the Forty-9er (VFO is completed) and hit a snag. The PCB shows CP9 as an electrolytic and the schematic shows it as a 0.1uF disc. To make things more confusing, I seem to recall mention of a different value...perhaps a .047uF disc. Can anyone tell me if I should go with the .1uF or some other value? I am about to put in the transistors and then wind and install the toroids, so I still have a bit of time to research this. BTW: I have created a 3-D printed plate with a proper sized hole to mount the LCD (including the mounting bolts) as well as the rotary encoder. It's a mock-up, as I am adding an audio amp, keyer, and other controls when the radio works like I want it to. I can send the Sketchup drawing of the plate if anyone needs it. Perhaps I can post it here under the files section. Not sure how helpful it would be. Wish me luck, Jim - AD4XX

I thought I would add the freq coverage mod, and the original problems/questions popped back up. The ROTARYSWITCHPIN is connected to D4 not D7 it is connected to pin 21 on J1 (nothing) The RIT pin is connected to D8, but I cannot find the RIT pin! D8 is connected to the AD9850 CLK I changed to D4 and added a ....,INPUT_PULLUP line for it and it seems to work normal Now to work on broadcast overload, sensitivity, & audio. :) 73, W4GHV Bo

One of the first posts I made here was for a BCI filter (see early photo). You can see the values in that photo. When I tested that filter, I wound the inductors on small toroids (FT37-61). I wondered what the degradation would be with axial inductors, which I bread boarded today. (See new pix.) The cap values remained the same, but the inductors changed from 1.622uH to 1.8uH and the 1.461uH to 1.5.uH. I plotted the new values in Elsie with a 7-pole Chebyshev and there is very little difference, especially for 40M and it still knocks the slats out of a nearby AM station. Although the bad is horrible today, I compared what I heard on the Forty-9er with my FTdx1200. I am likely imagining things, but I swear it was more clear on the Forty-9er. The insertion loss is next to nothing (-0.04dB). Buying brand new parts, my cost was thirty-five cents! Here's the breakdown: Part Qnty Cost Each Total 1500pF 2 0.03 0.06 560pF 2 0.01 0.02 1.8uH 2 0.09 0.18 1.5uH 1 0.09 0.09 ------------- Total: $0.35 While they don't have minimum orders on these items, I bought 20 of each inductor value and 50 for the caps since I can always use them or give them to friends. It also helps to spread the shipping costs, which are also reasonable. The company is at: http://www.taydaelectronics.com/ and they have pretty good delivery times. I've purchased a lot of parts from them. Jack, W8TEE

The 12V circuit that divides down using a 20K ohm in series with R8, 10K trimmer potentiometer. It apparently adjusts the voltage level on pin 26 (A7) of the Arduino Nano chip. What does this do and what should the voltage be adjusted too using R8? Seems an elabortate circuit simply to condition input pin 26. Should pin 26 be logic HIGH or LOW? Trying to get my 2nd 49er finished yesterday to output audio. Still no luck. Thanks, Jim-Ab1BR

Measurements for the March QST XCVR NE602 1 1.5vdc 2 1.5vdc 3 gnd 4 7vdc 5 N/C 6 VFO 7vdc & 4.0vpp ac 7 7vdc & 4.0vpp ac 8 8.2v dc Audio output 386 pin 6 30mv pp Nice CW sigs tonight before the religious broadcasts take over. Anyone have an idea what frequency they are on? I couldn't find local ones to match. 73, Bo W4GHV

I just got this from Farrukh: Hi, R8 is a 10k 25-turn trim-pot, used to calibrate power supply voltage measurement into Arduino Nano analog input A7. I think someone on the forum is working on code to measure power supply voltage and display on LCD with the power on splash message. And I think Dennis is right about the other problem of not getting NE602 output. There might be a short or open circuit along the path from VFO output via C3 to NE602 input pin 6. In a working circuit a scope should show the VFO 7 MHz sinewave on NE602 pin 6. - Farrukh

I just got this from Farrukh: Hi, R8 is a 10k 25-turn trim-pot, used to calibrate power supply voltage measurement into Arduino Nano analog input A7. I think someone on the forum is working on code to measure power supply voltage and display on LCD with the power on splash message. And I think Dennis is right about the other problem of not getting NE602 output. There might be a short or open circuit along the path from VFO output via C3 to NE602 input pin 6. In a working circuit a scope should show the VFO 7 MHz sinewave on NE602 pin 6. - Farrukh

Thanks Bo... The 386 output is pin 5 not pin 6...I bet you knew that! The Audio output jack on the 49er is a 2 conductor as far as I can tell, just not wired correctly on the PCB, i.e., the LM386 output (pin 5) is grounded if the 2-conductor 3.5mm plug is pushed in all the way. (...wonder why no one else has been bitten by this ?!)... Cheers, Jim -AB1BR

Does any one have a part # (from Digikey or another vendor) for the 22 uH inductor for the mod to the Forty 9er. I do not believe that it was included with Farrukh's DDS parts or the Fory 9er kit. 73, Bob Widmaier K3jop

I have populated the Nano DDS VFO PCB that I have from K2ZIA with the last component remaining; the C8 capacitor 100u-25v. In looking at the PCB outline for the placement of C8, I see two outlines for it and solder pads for it under or nearly so, the mini-360. Not wanting to make any mistakes this far into the build, could someone please clarify the connection points for C8 for me? After I accomplish this, I will be able to continue on with the project. 73, de Karl, KO8S

Good morning/afternoon all, I am having trouble with the software finding/loading the correct driver for my Nano. Yes I have run the driver set-up in the Drivers directory of the Arduino software and the installation reports all OK but when I plug in the nano it says "driver not loaded" I'm wondering if the nanos I bought have "knock-off" FTDI usb chips on the boards (only paid a couple of bucks each for them from china)? Running windoze 7 Any help/suggestions appreciated. Thanks Wayne - NQ0RP

I bought a Forty-9er kit on eBay and was doing a parts inventory. One toroid is red, which would be the T37-2. The other is green. Is that likely to be a FT37-43 or is it maybe the wrong core type? In my experience the ferrite cores are usually black, and a colored one would iron core.

I just finished an article on making your own PCB's and used my BCI filter, a dummy load, and Lou's (W2ROW) offset as the example. I posted a photo. The dummy load is made up of eight 100 ohm, 3W resistors, so it should be good with rigs up to about 20W. While this may seem stupid for the Forty-9er since there's no tuning controls, not really, since you could now use it as a code practice oscillator if nothing else. The other alternative is to make the board and "cut off" the part of the board that is of interest to you. I plan on making a new PCB with just the BCI and DL on it, with the idea of cutting them apart afterwards. I'll then put a BNC connector on the DL and probably wire the BCI filter between the Forty-9er board and the BCN connector.

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the SoftwareControlledHamRadio group. File : /vfo-source-rev6-volt.ino Uploaded by : hankellis1958 <HankEllis@...> Description : Modification to base VFO code to implement the voltmeter option. You can access this file at the URL: https://groups.yahoo.com/neo/groups/SoftwareControlledHamRadio/files/vfo-source-rev6-volt.ino To learn more about file sharing for your group, please visit: https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards, hankellis1958 <HankEllis@...>

Well I finally got to building the nano-DDS kit, Nice, very nice. But I had difficulty with the mini360 regulator board. I could not get it to adjust below 8.7v, I had a few in my stock box so no biggie but I tested the replacement before I swapped out the one I had already fitted, yep, the new one adjusts down to 5v no worries so I went ahead and replaced the original. I tested the original outside of the nano kit and sure enough it would not go below 8.7v. I mention this to prospective builders and suggest that you test the module before you fit it. This is just a heads-up to save prospective builders some potential trouble and is absolutely not a criticism. Thanks again for a great project. Blessings Wayne - NQ0RP

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the SoftwareControlledHamRadio group. File : /CH341SER.zip Uploaded by : fleapowerus <wayne.dillon@...> Description : Driver for the Chinese Arduino boards (Zipped) You can access this file at the URL: https://groups.yahoo.com/neo/groups/SoftwareControlledHamRadio/files/CH341SER.zip To learn more about file sharing for your group, please visit: https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards, fleapowerus <wayne.dillon@...>

I just uoloaded the CH341SER zipped driver for windows 7 and the "non recognised" serial/usb port on the Arduino boards. Hope folks find this useful. Wayne - NQ0RP

I finished assembling my unit on the weekend and it seems to be working quite well. It picks up quite a few CW stations in the evening and I'm getting RF output of close to 2 Watts. I have to find a suitable case and play with some software tweaks.