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Re: 49er transceiver build by W0MNA
I saw Gary's Forty-9er at the Four Days In May (FDIM) conference in Fairborn, OH (suburb of Dayton) that takes place just before the Dayton hamfest. The rig looks even better than the photos. I know it generated a lot of interest at the FDIM Builders Night that showcases individual QRP projects. I kinda thought Gary's Forty-9er would take the grand prize, it was that nice. BTW, if you're interested in QRP, the FDIM should be on your Bucket List. I've attended the last two years and have enjoyed it very much. They also have a build-a-thon plus shuttle buses to the Hamfest on Friday and Saturday. I also enjoy the group's magazine, QRP Quarterly, too. Jack, W8TEE From: "w0mna74@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Tuesday, May 24, 2016 10:43 AM Subject: [SoftwareControlledHamRadio] 49er transceiver build by W0MNA I¡¯ve uploaded to the pictures section two pictures of the 40
Meter CW transceiver I built using the info from the March 2016 QST Magazine
article.? After completing the build as
described in the article, I added two more features I felt would enhance the operation
of this nice little QRP rig.
I added a programmable CW keyer and CW filter.? The keyer is the version 2 that was designed
by Craig Johnson ¨C AA0ZZ and the CW filter is the Hi-Per-Mite kit from 4SQRP
kits.? The version 2 keyer is now a
retired kit from the 4SQRP group but they do still have a few circuit boards
and IC¡¯s available.? They are now
advertising the version 3 kit and it will work very well in this transceiver
also.
Looking at the inside view of the transceiver you will see the
VFO section consisting of the AD9850 DDS and Arduino Nano in the upper
left.? To the right of that board is the
49er kit build exactly as laid out by the guide from the Farrukh Zia
website.? In the lower left is the keyer
board with three buttons to program buffers.?
In the lower right is the CW filter which can be switched in or
out.? It¡¯s nice to be able to switch the
filter out when you tune up into the SSB portions of the band.? The small board on the far lower right is a
voltage regulating board I built to provide the 9vdc and 5vdc required for the
keyer and CW filter.
The transceiver works very well and does a surprisingly good
job on receive when the band is open, but unfortunately band conditions have
been poor lately.? The transmitter will
put out 3.4 watts using a 12vdc battery.
This was a fun project and thanks to Jack Purdum ¨C W8TEE,
Farrukh Zia ¨C K2ZIA and Dennis Kidder ¨C W6DQ for coming up with the
design.? One other note, use only the
files from the Farrukh Zia website when building this project.? They are up-to-date and complete.? I found the ARRL website files not to be the
latest and most accurate.
Gary A. ¨C W0MNA
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Re: In need of some vfo help
I'm not sure where you got the LCD display, but it does look like some of the characters are being displayed correctly. If you bought the display from Yourduino.com, I would suggest loading a sample program from their web site and seeing if the display works properly. It appears that you are getting the '7' from the 7MHz and the 'e' in General. I'm not sure about the rest of the display. I would also suggest you download the code again from Farrukh's site, as there were corrections made to the code but QST didn't change the download files. His site is: www.farrukhzia.com/k2zia? Jack, W8TEE From: "wh6fao@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Tuesday, May 24, 2016 12:59 AM Subject: [SoftwareControlledHamRadio] In need of some vfo help greetings from the Aloha State.. my name is Peter and my call sign is WH6FAO since there has been a backlog on the connecting board I made my own from the schematic. While it does power up I am having a issue with the display I have posted a short video on youtube showing it??.?
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Re: Capacitor for the LC Circuit is a 56pF
Go to the photo section and scroll down almost to the start and the schematic is there as well as a plot that shows the dB cutoff. Jack, W8TEE From: "ad4xx@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Sunday, May 22, 2016 3:40 PM Subject: [SoftwareControlledHamRadio] Re: Capacitor for the LC Circuit is a 56pF I ordered your book and should get it in just a few days.? I look forward to reading it.? As for the filter schematic, I have not been able to find it.? I am brand new to Yahoo Groups so I am sure I will figure out where it's posted shortly.
Thanks! Jim - AD4XX |
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Re: Adding VFO to another radio
There are some thoughts on this in Chapter 16 of the Arduino Projects for Amateur Radio book. Since the basic design of the VFO was from the book, with a few mods by Farrukh, it should be able to work with almost any other type of rig. Jack, W8TEE From: "ad4xx@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Sunday, May 22, 2016 8:32 AM Subject: [SoftwareControlledHamRadio] Adding VFO to another radio I have the VFO section working properly and I'd like to add it to a more substantial QRP kit than the Forty-9er.? Perhaps the OHR 100A, or a MFJ kit.? I wonder if anyone has information about a successful attempt along those lines.? It does not have to be the OHR rig...but something along those lines.?
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Re: DDS VFO TXOffset Function
Hi Lou: This is great...and the exact reason we created this Forum in the first place! I'm up to my butt in alligators right now or I'd volunteer, but I'm sure someone out there will take you up on your offer. It would be a definite improvement! 73, Jack, W8TEE From: "louvoerman@... [SoftwareControlledHamRadio]" To: SoftwareControlledHamRadio@... Sent: Saturday, May 21, 2016 10:43 AM Subject: Re: [SoftwareControlledHamRadio] DDS VFO TXOffset Function I have RX offset working. Unfortunately it requires a hardware mod. Currently you can sense the T/R state of the 49er by reading the RXTXPIN (set pinmode to input (no pullup!)) it will read high for receive and low for transmit. The problem is that by the time you detect the 49er has entered transmit mode it is already transmitting. Changing the frequency on the fly would not be a good idea (bad chirp at best)!
I needed to key the 49er through the Arduino so I could change the frequency before entering transmit mode and change it back when entering receive mode. This requires the key be connected to an Arduino input pin instead of the 49er directly. It also requires that an output pin from the Arduino key the 49er. I used an NPN transistor and a 1K resistor to accomplish this. Pin D7 is used for input and pin D13 is used for output. I uploaded a schematic to the files section - RX_offset_mod.pdf. As for the code, I have it working fine business for my setup but I use a different LCD display and library so can not share the code directly. I did modify the original code but can not test it on my hardware. It does compile without errors. I am looking for a volunteer or two who is willing to do the hardware mods and test the code with standard hardware. I will send the source code to you. I am hesitant to post the code here until it is tested on the standard hardware. I can be reached at the email address I used to join the group. Thanks and 73, Lou? W2ROW |
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Re: Capacitor for the LC Circuit is a 56pF
Probably not. However, an earlier post of mine has an inexpensive Broadcast Interference (BCI) filter that I built and works great. I have an AM station a few miles from my house and that was all I could hear with one of my units. I put that BCI filter on it and there is no trace of the AM station now.
Jack, W8TEE |
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Re: Capacitor for the LC Circuit is a 56pF
Probably not. However, an earlier post of mine has an inexpensive Broadcast Interference (BCI) filter that I built and works great. I have an AM station a few miles from my house and that was all I could hear with one of my units. I put that BCI filter on it and there is no trace of the AM station now.
Jack, W8TEE |
jjpurdum