Two Letter Re: MURS Radios and Microphone Connections

Jim, I am considering buying a set of the MURS radios from your advertiser [MURS Radio] but I have a question for you and the readers. I want to use a microphone setup like this but the plugs seem to be incompatible. The radio is a Kenwood K1 plug and the microphone is listed as Motorola Pro Series 2 pin. Are there adapters to connect the two or are there similar or better throat microphone setups that will work with the K1 plug? Thanks, – W. in Wyoming [I forwarded W.’s e-mail to Rob at MURS Radio, and he sent …




Letter Re: Source for AAA to D Cell Battery Upsizers/Adapters

Jim, I trust all is well with you and yours. I recently found a source for a battery adapter. There are a lot of products that will take one AA cell and make a D cell battery. I found somebody makes an adapter that uses two size AA cells to make a D cell battery. (Twice as much battery life.) I’ve even seen a reference to some adapters that use three AA batteries. (That would be neat.) I recently received and tested C cell and D cell upsizers. The C cell is the common type, one AA battery makes one …




Letter Re: My Experience with TA-1042 Field Telephones

I noticed that one of your advertisers is currently selling surplus AN/TA-1042 Digital Non-secure Voice Terminal (DNVT) field telephones. Earlier this year I bought two pair of them and even though I don’t have the hard-to-find circuit switch, (AN/TTC-39D) for terminal to terminal dialing, when a pair is interconnected these phones offer super communications. The full duplex audio is clear and crisp over several hundred feet of wire (easily), has a ringer and audio volume control and a ring indicator LED ( flashing for ringing, steady on signifies in-use) for silent mode operation. I run mine in a local battery …




Note From JWR:

Today we welcome our newest advertiser, MURS Radio. They sell bargain-priced surplus VHF portable two-way radios that operate in the Multi Use Radio Service (MURS) allocated frequencies. These radios come complete and ready to use with antenna, battery, belt clip and drop-in charger for only $49 each. Yes, they have a few scratches and they’ll have a sticker that covers the original emergency service department engravings, but for just $49 for a 2 Watt transceiver, they are a great deal. MURS frequencies and do not require a license in the U.S. These are pre-programmed with five MURS frequencies and three …




Letter Re: Expedient Faraday Cage EMP Protection

Mr Rawles, First…this is an excellent site and, on equal footing, so is your book “Patriots”. In my opinion so much so that in the course of habitually re-reading it I am wearing the book out. In regards to EMP protection: an old refrigerator, chest freezer, unused oven, or for that matter, a metal utility cabinet etc. will work. These appliances will allow the storage of more than a few “delicate” and sensitive electronic devices. Having a redundant radio collection is advisable. These devices will function well as long as all six sides are metal, are electrically connected (a few …




Letter Re: Inexpensive CBs for a Car Emergency Kit?

Jim: You might perhaps solicit some information from other readers relating to inexpensive CB rigs that could be carried in a car emergency kit? Kind Regards, – James C. JWR Replies: My general advice is that I’d rather spend $100 on a used (but guaranteed) SSB rig than I would a brand new-in-the-box rig that doesn’t have SSB capability. Your thoughts, folks?




Letter Re: Recommendations on Solar Battery Chargers?

Jim, Could you maybe put the word out as to where to find a good reasonably priced solar panel for charging Ni-MH batteries? Thanks. – Gung Ho JWR Replies: I recommend Ready Made Resources for solar battery chargers, although there are several other Internet vendors that sell comparable products. But I can vouch for RMR’s reliability and customer service. If you are on a budget RMR’s compact Universal Solar Charger at under $28 is the way to go. But this model charges just two batteries at a time. If you have a bigger budget, any of the Global Solar brand …




Letter Re: U.S. Military Surplus Backpack VHF Transceivers

Jim and Memsahib: I talked with a fellow on 6 meters FM yesterday. He is a military radio collector. I wish that you could have heard this conversation. He collects everything, and has about every military radio. He said that he stopped buying more a few years ago because the prices got too high. After 9-11 prices skyrocketed. He also said the AN/PRC-77 is one of the radios to stay away from. The blow out their finals too easily. The older AN/PRC-25 is much better. Also that the new AN/PRC-168 are superior [in reliability to the AN/PRC-77.] Also, he said …




Letter Re: Rechargeable Batteries for FRS and GMRS Radios

Jim, Just a note on the popular two-way handheld radios sold in many big box and sporting goods stores in the US. I have been trying to standardize my rechargeable batteries for these little handhelds to the ubiquitous AAs since my scanners and many of our other small lights and some gear run on them. I have four older Motorolas from 3-to-5 years ago for our use around the farm and when traveling with more than one vehicle for any distance. First, I noticed that there has been a gradual switch for these FRS/GMRS radios that once took AAs you …




Letter Re: Surplus Wireless and Hard Wire Seismic Intrusion Detection

Hi Jim, I like your site! (And enjoyed “Patriots” quite a bit, too!) It was referred to your site by a customer in Louisiana. My customer mentioned that I could probably mention my remaining TRS-2 PEWS seismic intrusion detectors on your site. We have about 30 detector/transmitters (DT-577 V(6) /TRS-2) left. @ $60/ea. (these run on a 9VDC ‘transistor radio’ battery for about two weeks, and are on 150.6 MHz) Also have about a dozen of the R-1808 V(6) /TRS-2 Receivers (same frequency) @ $500 each. (These run on two each 9VDC batteries for a couple of days.) All of …




Letter Re: Another Six Meter Band Propagation “Opening”

Jim: I worked a few stations this evening; one into Montana with my 10 watt transceiver. The 6 meter band has been red hot the last few days. I’ve even heard brief openings allowing hams on the West Coast of the U.S. to chat with folks in Europe. Sometimes the openings start very early in the morning. These are very unusual propagation conditions. OBTW, You have to read this: http://k7xc.tripod.com/ This guy is very funny. His writing style is great. He should start his own blog! Talk about working on a shoe string. Best Regards, – Fred the Valmet-meister




Letter Re: A New Google Earth Feature Tailored for Ham Radio Operators

Jim: Check this out! http://www.dxers.info/google/earth/index.php For example, scroll down to 6M and click on the 1 hour map. It brings up Google Earth with the “push pins.” When you click on the push pin you get the call sign of the amateur operator which can be put into www.qrz.com, and that tells you who they are and where they live. – Fred the Valmet-meister




Letter Re: Licensing Requirements for FRS Versus GMRS Radio Transmission

Dear Jim: I recently purchased a Motorola SX 700 Radio. Inside the package is a notice regarding [U.S.] Federal Communications Commission (FCC) licensing. It states that if you operate on GMRS frequencies you need a license from the FCC. Channels 1-7 and 15-22 are GMRS. What about channels 8-14? Do I need this license? Or can I use Channels 8-14? Thanks. – J.H. JWR Replies: Your assumption was correct. No license is required in the U.S. for transmitting on Family Radio Service (FRS) channels. (Channels 8 to 14). But you must have a GMRS license issued by the FCC to …




Letter Re: “Power Up”–A Useful Reference on Battery Conversions for Military Electronics

James, You need to take a look at this link. It is an online version of a very rare book (Power Up) that shows how to make standard battery conversions of many military items, something that could come in handy one of these days. Best Regards, – Jim K. JWR Replies: This link works well in Firefox, but Netscape some other browsers have conflicts, so you may have to turn off Java to see this page properly. Once there, click on the link for any particular piece of military equipment. This is indeed a great reference!




Letter Re: Of Computers, Generators, Power Anomalies and Lightning

Greetings Jim, I read Redclay’s letter on his questioning using electronics with generators. Ham (Amateur Radio) operators have been using various electronic devices for years powered by generators. The use of power sensitive devices such as a computer on a generator is fine if you take some precautions. First off the generator is what I called a “spiky” power source. So to smooth out the power supplied to the electronics one wants to use a good spike/surge protector between the generator and electronic devices. Do not skimp on cost and quality here. In my opinion it is preferable to use …