Category: Communications & Receivers

Letter Re: Non-Nuclear Electro Magnetic Pulse Weapons

James: One tidbit I recently learned less than a week ago: non-nuclear EMP bombs are actually easy and cheap to make Its a permanent magnet, a coil, an antenna, and a bomb to push the magnet past the coil. The enormous electrical energy is released through the antenna causes a powerful EMP to be released, depending on the size of the device used. These tend to be heavy so I doubt you’ll see big ones flying around but a truck or railcar sized bomb would be really potent, possibly covering a dozen mile radius. Shipping containers probably won’t work that …


Two Letters Re: EMP Shielding for Electronics

Jim: Maybe I missed something during the acquisition of several undergrad degrees, including one in physics (actually, I probably missed several things)… but how exactly does a Faraday cage have any effect on uncharged particle emissions (neutrons) as suggested by the author of the article that you recently provided a link to? And since when did Einstein claim discovery of an element (Uranium) that was discovered in the 1700’s? His cages might work (hard to actually test anything vs. EMP without doing rather large scale experiments), but that sort of nonsense kinda damages his overall credibility. – Simple Country Doc …


Letter Re: Some Useful Ham Radio, DXing, and CB Radio Web Sites

Hi Jim. While reviewing accessories for the MURS radios, I perused my way onto this Ham radio site that is loaded with links to other sites and/or articles on antenna building for literally all of the radio spectrum.Of particular interest is this site for converting an old outdoor television antenna into a 2 meter (144-148 MHz) Yagi (beam) antenna for very little money: Since many of the readers of SurvivalBlog are interested in communications I feel these other sites would be helpful as well, here are some other useful sites regarding ham and CB radio repairs Radiomods.co.nz Roger Bird Antennas …


Letter Re: Communications and Monitoring for Disasters–Are Scanners Useful?

Hi Jim, Last week you discussed your preference for communication modalities for use in disasters and their order of importance. Obvious by omission were two modes that I thought might have distinct utility: a radio scanner (to monitor weather, traffic accidents and attendant backups, police and fire activity, etc.) and a transceiver with frequencies in the amateur bands (160, 80, 40, 20, 10 and 6 meters and the centimeter bands). Will you please provide your thoughts on the utility of these devices and whether or not you think they are worth the trouble (expense and licensing)? Thanks for your input. …


Letter Re: Solar Charged Walkway Lights –An Option for Battery Charging

Mr. Rawles, In response to what you wrote in the Blog on Friday, November 24th: “The system does has some utility. However, except for people that have an alternative power power system (quite uncommon around Washington, D.C.), in a long term TEOTWAWKI, stations will gradually drop off the air one by one because most folks will not be able to recharge their batteries. (Just another reason why every family should have at least a small photovoltaic (PV) power system.) Contact the folks at Ready Made Resources for details on setting up such a system.“ I read something a while back …


Letter Re: Product Review on MURS Radios

Jim, Hail and well met. – I purchased two of the handheld MURS transceivers from MURS Radios. (A SurvivalBlog advertiser.) First off, they arrived really fast. The shipping only took a few days. They were also packaged very securely. Although you can tell that these radios were used, they do not look abused in any way. I was impressed right off the bat by them. For one thing, they do not feel like a toy in your hand…they have some heft to them. They also came fully charged. In the box along with the radios were the chargers and good …


Two Letters Re: Advice on Disaster Communications

Hello, I am somewhat new to your web site. The information I have been able to get from it is wonderful and greatly appreciated. Have you seen the article from World Net Daily [about the DC Emergency Radio Network]? I have not heard of this type of system before. Respectfully, – B.W. JWR Replies: Yes, I saw the article. The DCERN uses the low power FRS band and thus these radios have very short range. I think that the higher power MURS or CB bands would have been a better choice. The system does has some utility. However, except for …


Letter Re: 12 VDC Wall Outlets and Power Cord Connections

Jim, For anyone using 12 VDC in their vehicle or home, you should strongly consider using Anderson Power Poles. Compared to the standard cigarette lighter plug, these are far more reliable and safer. (Cigarette lighter plugs have no uniform rating, and can melt if used for high [current] load applications.) These connectors come in ratings from 30 Amps (A) to 350 Amps. The 30A size is the de-facto standard for Ham radio operators now, and the larger sizes are what you see used for things like large battery racks in computer rooms and tow truck jumper cables. They are easy …


Four Letters Re: Prowlers and Lighting

James: The subject of handheld lights is as long as it is wide. Ask 20 people what is best, get 40 answers and recommendations! As with many things, today we live in a great time for flashlight technology. My recommendation is to immerse yourself in www.candlepowerforums.com. Some guys there are truly on the cutting edge of lights. Some of the modified lights are incredible. Have fun and enjoy a winter’s worth of reading. – Straightblast   Jim: Just enjoying a last respite prior to retiring in my mountaintop isolated home and read the letter on Prowlers and Lighting at SurvivalBlog. …


Letter Re: MURS Radios, Dakota Alerts, and PIR Sensors

Jim, I for one I’m very happy that your novel “Patriots” back in print. For a long time I gave this book away to friends who I thought might like it, and to some whom I wanted to “feel out” as to whether they thought preparedness was a good idea. I had to stop this of course when your book went out of print, and the cost went skyward. Now I can stock up again. Also I wanted to thank you for turning me on to MURS Radios. I just made an order with Rob, and will be making another …


Letter Re: Clothes Washing Without Grid Power

Shalom Jim: Recently my wife and I have started looking to replace our old [clothes] washer and dryer machines with something more energy-efficient. Since we plan on converting to solar photovoltaic panels in the future what do you suggest we do now? 1.) Lehman’s sells an AC +/ DC operated washer. Is this (DC) feature conducive to solar technology? 2.) What are you and your family doing for your clothes washing needs? B’Shem Yahshua HaMoshiach (In the Name of Yahsua the Messiah) – Dr. Sidney Zweibel   JWR Replies: 1.) With a PV power system, using a DC motor clothes …


Product Review of the MURS Alert Motion Detector/Alarm from Dakota Alert

Mr. Rawles, I saw a mention on your site of the Dakota Alert system, and since I’ve been using one for about a year, I thought I’d sent you a few comments. First, I had tried a previous Dakota Alert system, several years ago, and found it unreliable, then tried several others and also found them either too short ranged or unreliable. I have a 1500′ driveway, about one half of which is blocked by a hill and trees. I ran across the MURS system sold by a company in Canada, and didn’t even know until I got it that …


Two Letters Re: Product Review of the MURS Alert Motion Detector/Alarm From Dakota Alert

Mr. Rawles: My friends and I have been using the MURS band for some time. It generally has better range than FRS/GMRS and is much less crowded. There is an interesting product available that works with these radios as a sort of “perimeter alarm” system. The MURS Alert from Dakota Alert is a small, weatherproof box that combines a PIR motion detector with a 1-watt MURS transmitter and a voice module. It uses six size AA batteries and has an advertised six month battery life. The unit is placed near a road, driveway, trail, etc and set up. When a …


Letter Re: MURS Radios and Microphone Connections

James, Your MURS supplier [MURS Radios] has an excellent product. Regarding inconspicuous microphones and earpieces: We’ve been using this gentleman’s products for the last 5 or 6 years and been very well pleased. About halfway down the page is the Stealth 3-Wire Surveillance Kit, which is what I use. About the only thing I’ve found that I like better is the combination earpiece mike where you talk thru your ear but it definitely has problems in high noise environment and we had trouble with them in helicopters. Every time you open your mouth, the rotor/engine/wind noise overrides your voice. Darned …


Letter Re: A Useful Reference on Amateur Radio Band Designations

Jim, Here is a useful link for a free, downloadable, “.pdf ” format, frequency allocation chart. It is located on the ARRL (American Radio Relay League) web site. It delineates the U.S. amateur bands and their assigned usages from 1.8 MHz to 1.3 GHz. Regards, – Joe from Tennessee JWR Replies: Thanks for sending that link. The radio band designations can be confusing to folks who are newcomers to the short wave listening and amateur radio worlds. I highly recommend that all SurvivalBlog readers at the very minimum buy themselves a short wave radio and a multi-band police scanner, and …