Periodic Dispatch – November 15th, 2021

The Rittenhouse trial went to the jury today after closing arguments. Wisconsin has already activated a few National Guard troops in advance. Those readers who live near Kenosha, WI might be able to get some interesting COMINT over the next few days. If there is some e-skip or other type of band opening, out of state monitors might also hear something below 50 MHz. The majority of the traffic will probably be on WISCOM. National Guard might also use 138-144 MHz., 148-150.775 MHz., and the Federal portions of 30-50 MHz. If any Sparks31 students from the Horicon, WI class back in 2014 hear something interesting, an email or just an anonymous comment at the end of this post would be greatly appreciated.

The writer’s favorite Army/Navy store had gotten in this little item, and since the price was right it came home with him. It is a WW2 vintage US Navy receiver used for monitoring sono-bouys in anti-submarine warfare. They hit the surplus market in the 1960s after the frequencies used for the bouys changed. PRC68.COM has an article on the early systems for those who are interested. For the writer’s purposes, this is a simple vacuum tube-based FM-mode receiver that runs on DC. Inspection of the circuit revealed, despite the lack of a schematic, that the receiver should be able to be modified to slide down to the upper end of the VHF-Low LMR band and the Six Meter Ham band. It is also interesting to note that the earlier version of this receiver, the ARR-3, was used in early MASINT experiments (Project MOGUL). At present, the frequency range of 62.8-72.1 MHz. is used by TV Channels 3 and 4, as well as by the US Military SINCGARS.

Aliens Are (Probably) Not Broadcasting a Signal from Space |

The R-156/ARR-16 is another good example of junk hacking material. It was an inexpensively-procured piece of electronics, albeit vintage, that can be easily modified and repurposed for something useful. From a self-reliance and preparedness standpoint, it runs on DC, uses EMP-resistant tubes, and is simple enough for a hobbyist to repair. Most hams and monitoring enthusiasts aren’t interested in it because the initial frequency range is of no use.

Those readers who are interested in working on surplus radio gear, especially the old Navy stuff, should visit this site.

Author: Ticom

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