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DDS and DueDDS Libraries
Here are a pair of libraries to ease the interface of an AD9850 Direct Digital Synthesis Module to an Arduino.The first library, DDS, uses soft SPI to allow any Arduino to control a DDS Module. It is...
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Flying a Kite for TX Factor
I was listening to Roger, g4roj(/p), working SSB on 40m on Saturday from a full-wave vertical kite antenna above a field somewhere in the midlands on my Arduino Due Software Defined Radio.Roger's...
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PSK31 on the BITx
Changes being (reputedly) as good as rests, I decided to try working some PSK31 on my multi-band BITx...I have just acquired an iPad Mini (with which I am delighted) and I stumbled across the PSKer app...
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SDR Front End
Work on developing the Arduino SDR continues with the rationalization of the front end into a plug-in module... This little unit combines the quadrature clock generator section of my DDS shield, as...
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Arduino and the Si570
I've been wanting to experiment with replacing my little AD9850 DDS modules with the Si570 device. Not out of any sense of dissatisfaction with the former - more out of a spirit of adventure and in...
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Short Stay
Just back from an Easter holiday in Pickering...with its special delights for the preserved railway enthusiast and angler. As before, we stayed at High Millbut this time my three daughters and their...
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RF Sweep Generator
Here's some notes about generating RF sweep signals on the Arduino for filter testing - it is really just a digital version of the old Wobbulator concept.First look was a little disappointing because,...
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Sweeping the BITX IF
Having brewed up the little scheme for visualising the magnitude response of filters using RF sweeps generated by the Arduino, I decided to take a look at the crystal filter I made for my SSB rig. That...
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Imprints of Redundancy
I am (as a result of a generous Christmas gift from my daughters) a subscriber to Practical Wireless and had been pleased to see some of Don, g3xtt's "holiday snaps" from the DXpedition to the Austral...
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Walkabout on the beach
I was fortunate to spend last week on the beach at Aldeburgh, Suffolk. I took my FT817 and Walkabout II Antenna, hoping to work some /p.Well - I have to report a pretty poor show - I logged only one...
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Repairing my Walkabout mk II
Last weekend in the North of England was graced by glorious sunshine and radio rallies on both Saturday and Sunday - perfect conditions to take drives in the country...Saturday saw the XYL and I take...
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New BITx Mic PreAmp - for CW !
My new rig (that is to say, the rig that was new in November last year and that has been the subject of continual development) has been sprawled all over the bench for too long, making a general...
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Raspberry Jam for Tea?
It is now 18 months since last I played with my Raspberry Pi and irritated some folk over at Hackaday (I must remember: "There is no such thing as bad publicity").I've become so used to playing with...
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Boxing Clever
Having dealt with the small amount of electronic preparatory work the time had come to cut some metal and put my experimental HF rig into its new enclosure. Or - to be more accurate - into its old...
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Enhancing the Enhanced
I was pleased to use one of the nice new 20 * 4 backlit LCD displays from Kanga in my newly enclosed rig, as reported last week. Having done that, it was only reasonable to re-work the Kanga VFO system...
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Plug-In BITX Modules
Anyone who reads these notes will already know that I like plug in modules for solder-less breadboards. Here's a couple more to add to my fleet...I've been playing around with some ideas for cheap 'n...
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OCM
It is like those snacks - you know, the ones that come in a cardboard tube - "once you pop, you can't stop". Once you've made one plug-in module, you just have to make another.Apparently it is called...
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Breadboard BITX
Having first built a BITX bidirectional amp as a plug-in module then developed a mild obsession for plug-ins associated with the BITX, I found the temptation to build a complete plug-in BITX radio too...
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Power play
I've been meaning to make some kind of RF power meter for a while now. Well, today I made a start...I was inspired (not for the first time) by Eamon "Ed" Skelton, ei9gq, whose monthly "Homebrew"...
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Dummy Load
My recent games with RF peak voltage measurement left me wanting another dummy load...It isn't that I haven't got enough dummy loads already - in fact there seem to be quite a lot of them here at...
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