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Finessing Rotary Encoder Code
My interrupt-driven code for the rotary encoder certainly has made a worthwhile improvement to the "feel" of my rigs - particularly the "Parallel IF" rig. But I've noticed one little wrinkle in the...
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Occam's Si5351
This post describes the application of the Si5351 in a simple QRP CW transceiver from the "Occam" series of rigs...The recently described Si5351 system under development is intended to be a development...
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Online I.F. Alignment
This post presents some new code to allow Online Alignment of single conversion receivers which use digital RF Generators and my Arduino code.The original "RF Generation for Superhets" scheme (SPRAT...
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More Rx Bandwidth Measurement
Way back in 2011 I published a design for an analog AF CW filter in SPRAT 146...The filter was slightly unusual (i.e. it was differentiated from the thousands of other CW filters that already litter...
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Arduino SDR Tx I
Tinkering at the bench this weekend has seen the focus of attention shift back to software defined radio. I am satisfied with operation of my stand-alone Arduino DUE-based HF receiver, but now it is...
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Pluggin' Away
More development of the Plug-In BITX Module concept...Having taken delivery of a bumper bundle of 40 pin 0.1 inch female header connectors from Banggood for the price of a pint of beer (including...
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Parallel IF for the Vero BITX
Last week's new home for the plug-in modules had a Parallel IF path - but needed some more work...Specifically, I was actually only running the ordinary Si5351 code - which doesn't support the...
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Suddenly Direct Conversion
As mentioned recently, there has been a resurgence of interest in the receiver section of the Occam's Microcontroller system - which itself was inspired by George, g3rjv's Sudden...This has inspired...
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New Licences and the 60m Minefield
UK amateurs have been receiving new licences over the past few weeks from our dear licencing authority, OFCOM.The licences arrived (here at m0xpd, at least) by email and are pdf files, named by the...
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ANOTHER Raspberry Pi
Single board computers are coming thick and fast at the moment...No sooner than the Arduino ZERO has just been released, with its interesting ARM core processor...this morning saw the appearance of the...
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New Receiver Shield
The new Kanga / m0xpd Rx Shield is here...I stuffed the first production PCB yesterday evening and had it running on 40 in a matter of moments!There are no great surprises from the original "Sudden Rx...
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Si5351 Shield Production PCBs
After a long gestation, the production version of the Kanga / m0xpd Si5351 Shield PCBs is now back from the delivery room...I just finished populating the first full board and - like all proud fathers...
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Excess Aerial Baggage
Having turned over another page on the calendar and frightened myself by seeing the word "May", there's no avoiding the fact that I soon need to pack my bags and wend my weary way to Dayton.I see with...
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Another Rig for Occam...
The new Si5351 shield, shortly to be launched on an unsuspecting public at FDIM, and the new Rx shield, which made its debut only a few weeks ago at Blackpool, have tempted me to put together a new...
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Parallel IF Code
The Parallel IF idea is getting an airing at QRP-ARCI's Four Days in May convention this week.The Vero demonstrator has accompanied me across the pond and will be available for scrutiny at FDIM (and...
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Heading West
After a great time at Four Days in May, Shack Nasties is heading west...We're heading out on Interstate 80 (as you see) inspired by both the Oregon Trail and by Jack Kerouac. I say "we" because the XYL...
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Contact
I gave up on trying to find a telescopic pole and - instead - got some racquet balls and a ball of twine.The ball is like a squash ball (only bigger) and I've tied the end of the twine to it, so I can...
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Ham Radio in Laramie
I arrived back home yesterday from my trip to the US, my jeg-lagged mind awash with memories of new friends and great experiences. I met a great bunch of amateurs in my old stomping ground in Laramie,...
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Dayton
After a few self indulgent posts of what n2cqr would call "travelogue", its time to post some more useful material about Dayton - particularly as I'd made a fool of myself by speaking at the Four Days...
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Meeting a Master and a Masterpiece
Any QRP enthusiast and CERTAINLY any home-brewer should know of w7el's "Optimized Transceiver for 40m"...It is a beautiful piece of engineering - one of the few places where the word "Optimized" is...
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