ARRL Homebrew Challenge 3 radio update: re-use of an old radio chassis

I picked up this old Nemes Clarke receiver at a local hamfest. It is a VHF FM tube receiver.I then salvaged the chassis of this receiver, removing all internal components and saving those for a later date for re-use in other projects.Some of these salvaged components included a nice power supply transformer for tube gear, two chokes, and...

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update on the MIT Prof Ed 1-week radar course: SAR image of Kresge auditorium

Student results from the final day of the MIT Professional Education 1-week radar course, where everyone learns about radar, then makes one, then uses it in a series of field tests.Shown here is a SAR image using the student-built radar kit of the outside of Kresge auditorium. The railing around the underground garage entrance shows up really...

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What are these lines I wonder.....?

10 metre WSPR 5th August 2011I noticed the 10metre beacons were a bit active this morning, first I heard F5ZWE/B (10:13utc) RST 549 , followed by I0KNQ/B (10:18utc) RST 428.Then I had to go QRT for a few hoursLater in the afternoon I set up WSPR on 10 metres to see if there was anybody about, given the beacon reception this morning.As luck...

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update on the MIT Prof Ed 1-week radar course: RTI plot of Longfellow Bridge

Student results from day 3/5 of the MIT Professional Ed. 1-week radar course.Range time intensity plot of vehicles crossing the Longfellow bridge from Cambridge to Boston. This plot shows both the remarkable range of the coffee cantenna radar kit and this student's ability to make a small radar and use it to acquire real measuremen...

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20m WSPR report de MW0MJB.

I've been rearranging the shack recently and tonight was the first night that all was back to normal.I thought why not try out all the connections and cables with a bit ofWSPRing........These past few weeks I 've been thinking  of trying out a cb vertical on the 20m band By using a cb half wave antenna I could have a fair chance...

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More on The Spiral Challenge

A Homebrew_PCB Yahoo Group User; DJ, suggested that I try to fix my flawed 10 mil Spirals as reported on my previous post. With the aid of a 15 power Microscope I was able to fix each of the "opens". A few were hard to find, but tracing them around-and-around with an Ohm Meter under the Microscope did the trick.Fixing the trace breaks was...

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Tuesday evening RSGB 144MHz Activity Contest de GW0LVH

I make it well known that I’m not a contester or for that matter have any interest in that part of the hobby. For me a 59 and serial number is not what amateur radio is about.Anyway I’d been contacted by a couple of friends from my old club, Macclesfield & District ARS, to try and hook up in the RSGB 144MHz Activity Contest that’s held on the first Tuesday evening of the month. I was intending to operate in the low...

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update on the MIT Prof Ed 1-week radar course: DTI plot of an exercise bike

Student results from Day 2/5 of the MIT Professional Ed. radar course:A first in the history of Radar engineering and measurement: a doppler time intensity (DIT) plot of an exercise bi...

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The Spiral Challenge

I have been making a lot of Homebrew PCB lately, using the Toner Transfer Method. Must of the boards are prototypes, which will be later be fabricated by one of the online PCB suppliers. I have been feeling very good about the Homebrew Process and have created several small boards with high resolution for very dense SMD projects....

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QRP Portable, July 2011 de MW0BBU/p.

Now that July has flown past with great speed I thought I would do a little summary of the QRP portable activities here at MW0BBU. As you all know I am a great fan of SOTA and  it is a great activity to get out of the shack and try out the QRP kit from up high.Anyway, firstly the bands. When Mark, MW0MJB, and myself did...

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MIT prof ed 1-week radar short course update: 35 cantenna radar kits

Here they are, 35 cantenna radar kits prior to distribution as part of the 1-week MIT professional education radar course. Shown on the top figure are the 70 cantennas. Second photo shows the bags of parts for each kit.Each kit contains 6 uwave modules, solderless breadboards, a piece of plywood, 50 ft tape measurer, a handfull of analog...

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