The insertion loss was not nearly as high as I had expected - a good thing in my case. The insertion loss was about 0.70dB around 14.3MHz, while the attenuation at 28MHz was over 50dB.
Friday, August 30, 2013
Low Pass Filter (About Time!!!)
Using a kitsandparts.com kit - and my own wire - I constructed a 20m low pass filter with the clear intention of putting my radio on the air.
The insertion loss was not nearly as high as I had expected - a good thing in my case. The insertion loss was about 0.70dB around 14.3MHz, while the attenuation at 28MHz was over 50dB.
The insertion loss was not nearly as high as I had expected - a good thing in my case. The insertion loss was about 0.70dB around 14.3MHz, while the attenuation at 28MHz was over 50dB.
Sunday, August 18, 2013
TOO MANY INPUTS!!!!
I woke up this morning with my head spinning. (No, I didn't get drunk last night).
I had a long discussion last night with a fellow VWS member about radio designs and trying to get a kit together as if I had already volunteered. I was so tired, I did not have the defense to argue. He had a lot of good ideas, but he was pushing me to do his design as if it were my own.
I really need to draw the line on that. I am not willing to take on any new designs beyond my own right now. I got a lot of good ideas, but that is why my design is stuck! If a website could feel, I feel like a website that is being overloaded with requests for information and data uploads.
I don't mean to sound ungrateful, but I really need to hit the brakes on volunteering for any kit building designs until I get mine working. I do not have enough time to do any more.
Sorry to my friends at VWS.
I had a long discussion last night with a fellow VWS member about radio designs and trying to get a kit together as if I had already volunteered. I was so tired, I did not have the defense to argue. He had a lot of good ideas, but he was pushing me to do his design as if it were my own.
I really need to draw the line on that. I am not willing to take on any new designs beyond my own right now. I got a lot of good ideas, but that is why my design is stuck! If a website could feel, I feel like a website that is being overloaded with requests for information and data uploads.
I don't mean to sound ungrateful, but I really need to hit the brakes on volunteering for any kit building designs until I get mine working. I do not have enough time to do any more.
Sorry to my friends at VWS.
Sunday, August 11, 2013
Updated DDS-60 controller coming. Working on a EIM377 DDS controller.
Just got a nice email from Far Circuits...they are sending me samples of an updated PCB design for interfacing the AMQRP DDS-60 with a PICAXE 28x2 in an RF-friendly PCB. I had to open up some holes and fix some ground clearances. They had to fix some off-center etching issues from the previous design. If these work out, I will definitely send them an order for a full etch of boards in the hope to make a few of them.
My next big project on the DDS front is an RF-friendly interface for the EIM377 DDS controller. For the un-informed, the EIM377 is one of the AD9850-based DDS oscillators that have been selling for prices as cheap as $5 to $10. I bought four of them to play with. As my previous entry indicates, I was able to interface the EIM377 with the PICAXE 28x2. I did add a encoder interface to demo at the VWS club meeting, but it was taken apart again for a new mechanical layout.
I will forward new photos as the units are coming in for construction.
My next big project on the DDS front is an RF-friendly interface for the EIM377 DDS controller. For the un-informed, the EIM377 is one of the AD9850-based DDS oscillators that have been selling for prices as cheap as $5 to $10. I bought four of them to play with. As my previous entry indicates, I was able to interface the EIM377 with the PICAXE 28x2. I did add a encoder interface to demo at the VWS club meeting, but it was taken apart again for a new mechanical layout.
I will forward new photos as the units are coming in for construction.
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