Showing posts from January, 2020

Software Defined Radios for 2020

Some new technology to add to the new technology for 2020 . 2-3-2020 Photos of the day.. First we have a photo of Virginia Hall (from Baltimore), a famous WWII Spy working for the Brits and later the OSS. Here we see her pounding brass on a Paraset. That must be a British version of the GN82 hand crank generator. Notably she had a wooden leg, a result of a self inflicted gunshot wound. She passed in 1982. Our next photo has a deep meaning... Maybe this was about their voting for the emperor (with the small e) After connecting power of the wrong polarity to a circuit how many have said what is on this T Shirt.  I didn't do that but did put a Teensy 3.5 into a socket, one pin over, and did see a ball of flame come out of the top of the chip. Luckily I had two Teensy 3.5's (now only one). Even more lucky it was not the Teensy 4.0! ****************************************************** 2-1-2020 TEENSY 3.5 ala ZL2CTM, Working Again; But ne

You Saw where this was headed ~ A 1930's Style Station Part 3

The PMR6A Receiver itself will now undergo the re-incarnation process. 1-18-2020 ~ when you know stuff, you can do stuff! Not a uBitx v.6; but a trip back 67 years! 73's Pete N6QW 1-17-2020 ~ It is Alive!  More Space Filler. Ham Safety while working with Thermatrons (vacuum tubes).  Most of our homebrewing taking place today uses 12 VDC and that is not high voltage. Although I do know of a case where a constructor had his hand on a 5 VDC 30 amp power supply output -- seems like his ring got shorted across the supply and the ring nearly melted around his finger, which subsequently I think required amputation. So any voltage can be dangerous. The voltages in the PMR6A under load show 260 VDC on the lead to Pin #3 on the power connector. [There is a clue here for those who read every word...] The problem with the HV is that it can start your heart (defibrillator) or stop your heart if applied too long. One of the additional steps I will be u

It is all about our ham radio roots!

A Trip Back to the 1930's. 1/6/2019 ~ A Popular 1930's Transmitter Circuit known as the Jones Oscillator used two tubes in Push Pull. Below is the creation of W9GT, Jack, which uses two 955 acorn tubes and produces in excess of 1 watt to the antenna. The rig  is built into a wooden cigar box, which was a favorite building medium during the 1930's. Dave, K4TWJ an avid QRP enthusiast and author who I now think is a SK published a schematic for a single tube 955 version as well as the Jones two tube 955 version which is shown below.  I have been advised to be wary of simply plugging the output into an antenna as there may be issues in complying with current FCC spectral purity standards. My bent would be to install a Band Pass Filter on the output side ahead of the antenna.  [ For those who built the W1FB "Tuna Tin 2", you may recall that the ARRL revised the original schematic to add additional filtering so that there was compliance with the newe