MILITARY COLLECTOR GROUP POST, Oct.6/98 Index: THE GERMAN SEM-52; By Alan Tasker MEMBERS WRITE; Military Web Sites Back Up, Russian P-855 Info Needed, INFORMATION NEEDED ON THE JAPANESE TYPE 94-5 RECEIVERS; HUMOR; *********************************************** THE GERMAN SEM-52; By Alan Tasker OVERVIEW The SEM 52-A is a cute, small, 6 channel, low power (300 mW) Military portable of German build (SEL) that comes with an awkward looking (my opinion) head piece containing a tiny speaker and a bone conduction microphone. It runs from 6 ea penlight cells, and has a spare battery pack in its shoulder worn carry case (tape antenna also included). It is available from a couple of renowned surplus dealers. Nobody has come up with any documentation yet, so it takes some fitzing and futzing to try to figure things out. Jane's states that it is a narrow band FM unit, so you're not going to get loud audio when it transmits if you want to re crystal it to use with US mil gear. However, wideband audio is received pretty well in the un squelched mode (EIN). One thing to note is that in the squelched mode (RSP), the receiver is pulsed on for 50 ms every 250 ms (battery saving). If you don't know this, some measurements do not make sense. It usually comes set up with two channels, 47.8 and 55.5 MHz. The crystals are Fch+20 MHz, and they are attached to their own special element board containing the crystal, a cap (27-36 pF), and a voltage divider (two resistors). The crystals are supposedly parallel resonant, 27 pF load in an HC45 holder, but don't quote me. Send the one you are replacing to your crystal vendor so he can determine how to make yours at the new frequency. Nobody knows where there are more of these "element boards," so coming up on more than two channels is going to be very difficult. MODELS You see both SEM 52 and SEM 52-A mentioned. I believe they are all SEM 52-A units. Some of the packing shows SEM 52 even though there is a SEM 52-A inside. Also, Jane's mentions several other versions of the SEM 52 with more channels or different frequency bands. These models have a different letter after the "52." If anyone has seen a nameplate showing a straight SEM-52 without the A, please let me know. HANDSET CONVERSION Kim Campbell was nice enough to send me Mark Gluch's H-250 conversion. I wondered if there wasn't an easier way if you wanted to give up on both the side tone and the 150 Hz CTCSS function (my next project is to put a CTCSS board internal to the unit). There is an easier way, so now I have to get some of the male connectors that interface to the H-250 handset. Anyway, the following info is about the SEM 52 audio connector. Pin "A" is closest to the red dot or line. Progression is clockwise from the top of the unit connector. The first color is the wire color inside the PTT box, (while the second color is the color inside the unit). BE CAREFUL...your colors may vary...Mark and I have one wire a different color. "G" is the center pin. A magnifying glass helps. A, Ear piece, yellow, (green) B, Ear piece, white, (blue) C, Mike hot, center of the shielded wire in both cases(could be red, white, or???). D, PTT, green, (white) E, ?, ?, (yellow) F, +9 V for bone condition mike, brown, (red) G, Mike low, shield in both cases G, PTT return, gray, (shield) The surprise is two wires for the ear piece. There has to be an ohmic connection between yellow and white or the audio goes away. In addition, the DC level is up at 9 V. So, here is what you do. H-250 common (A) to SEM shield, pin G H-250 microphone (D) to pin C H-250 PTT (C) to green pin D 1 k Ohm resistor between yellow and white, A and B 4.7 uF cap (10 V ok, but 15 V better), plus to white, B Other side of cap (-) to H-250 ear piece (B). INNARDS If you take both covers off (metric bolts), here is what you see. Let's define the "up" as the side where we can view the body of the on/off switch and the volume control. There are several shielded items on this side. My experience/assumptions are as follows. L16/17/18 is a input/output band pass filter. The red coated assembly is the mic amp. L1/2/3/5 is an FM modulated 20 MHz oscillator. The tiny bare assembly is a doubly balanced mixer. L6/7/C21/14 is mixer post filtering. C41/L9/C44 is the final power stage(s). The shielded entity closest to the battery box is the oscillator for the main frequency determining crystals...the ones on the element boards in the rotary channel selector switch. R1 is a mike amp level control...CCW is max. R37 adjusts the output power level. The SEM 52 is VVC (voltage variable capacitor) tuned. There is a DC-to-DC converter assembly that creates about 20 Volts, and that is applied to the high end of the voltage divider on the crystal element board. The correct divider must be there to tune the radio for that particular crystal frequency (for example, replacing the 55.5 MHz crystal with one for 51 MHz required adding a 33.2 k Ohm resistor from the divider point to ground). This 20 Volts can be adjusted somewhat by the small pot seen almost obscured by the on/off switch body (on the front panel side). This control can be used to optimize the radio's tuning for any one channel, or to balance the tuning for a couple of channels. On the reverse side is one large shielded board. This is the receiver R12 is the squelch control R9 controls max audio level to the volume control (why I don't know). Comments elicited. Alan Tasker, atasker@ix.netcom.com *********************************************** MEMBERS WRITE; Military Web Sites Back Up, Ft Gordon web site is back up and runinng Carl he 143rd Signal Battalion Website is back up, for those who have not seen it. A Welcome page was added, the images moved to Tripod, EMail is now Voice_of_Iron@yahoo.com and some minor cosmetic changes. DanO Hi There, About those US Army web sites...... As the days go by, more and more of the sites are coming back online. Just the first of the week I was getting "FORBIDDEN" errors when trying to access the ADTDL and Fort Gordon sites on my web links page, but now, one by one, they are coming back. Figure they maybe have come to their senses. Most of the things they were closing were supposedly sites that had "personal information on DoD personnel" Heck, I never found any of those sites anyway, except the NAvy site had a page to help find Enlisted Navy folks. Oh well. Shit Happens. Or something like that. Tom ---------------------------------------------------------------------------------- Just wanted to let you guys know - I got my web page up - It's not complete but its pretty usable, still has some typos and some information to be put in. http://qsl.net/n5agq/ Hope you enjoy it. John Pitts(n5agq) --------------------------------------------------------------------------------- Russian P-855 Info Needed, I got a Russian P-855 emergency transmitter (13 x 8 x 3,5 cm). Somebody told me, that this thing comes from a MIG. Has anybody informations about that item (frequency etc.) ? Many greetings from Germany PS. I'm looking for -PP112 and vehicle mounting - all kind of GRC stuff (complete stations) Chris *********************************************** INFORMATION NEEDED ON THE JAPANESE TYPE 94-5 RECEIVERS; I have been examining several Japanese Type 94-5 Radio receivers and have found several differences in these sets. I am hoping to compile a more complete listing of these sets and a description of the sets. I would like to obtain the following information from your set(s) if you have any of these. Serial Number, date of manufacture, presense of the code (PR 8F ) on the case: Serial Number on the front panel of the receiver: Location of Part No 20, a capacitor next to or in the rear of the band switch: Metal can or Mica capacitor? Location of Part No 20, a RF coil, normally on the back center brace, sometimes on the left of the band switch, sometimes missing. Location of Part Nos 22 and 23, a joint set of RF coils, usually mounted on the left side of the band switch, sometimes missing: THE WILLIAM L. HOWARD ORDNANCE TECHNICAL INTELLIGENCE MUSEUM e-mail wlhoward@gte.net Telephone AC 727- 585-7756 *********************************************** HUMOR; News flash.........Apple has introduced a new computer............the Clinton............. wonderful machine with a 8 inch hard drive and NO memory.................. FLASH.................... Monica has become a Republican.............the Democrats left a bad taste in her mouth........................................ ---------------------------------------------------------------------------------- Sadly, both Bill Clinton and the Pope happened to die on the same day. By mistake, the Pope went to hell and Clinton went to heaven. They both spent a full day in the wrong place before God discovered his mistake and ordered that they be switched. So Clinton and the Pope were rounded up and sent along to the right places. Passing each other along the way, Clinton shouts across the clouds to the Pope: "Hey Pope, you're so lucky, you will really enjoy heaven." The pope replies: "Yes, I'm so looking forward to meeting the Virgin Mary" Clinton yells back: "Sorry, too late for that" ---------------------------------------------------------------------------------- You can't be a real country unless you have a beer and an airline- it helps if you have some kind of a football team, or some nuclear weapons, but at the very least you need a beer. --Frank Zappa Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. --Ernest Hemmingway Always remember that I have taken more out of alcohol than alcohol has taken out of me. --Winston Churchill He was a wise man who invented beer. --Plato Sir, if you were my husband, I would poison your drink. --Lady Astor to Winston Churchill Madam, if you were my wife, I would drink it. --His reply Work is the curse of the drinking class. --Oscar Wilde When I read about the evils of drinking, I gave up reading. --Henny Youngman Beer is proof that God loves us and wants us to be happy. --Benjamin Franklin If you ever reach total enlightenment while drinking beer, I bet it makes beer shoot out your nose. --Deep Thought, Jack Handy Without question, the greatest invention in the history of mankind is beer. Oh, I grant you that the wheel was also a fine invention, but the wheel does not go nearly as well with pizza. --Dave Barry The problem with the world is that everyone is a few drinks behind. --Humphrey Bogart Why is American beer served cold? So you can tell it from urine. --David Moulton People who drink light "beer" don't like the taste of beer; they just like to pee a lot. --Capital Brewery, Middleton, WI Give me a woman who loves beer and I will conquer the world. --Kaiser Wilhelm I would kill everyone in this room for a drop of sweet beer. --Homer Simpson Not all chemicals are bad. Without chemicals such as hydrogen and oxygen, for example, there would be no way to make water, a vital ingredient in beer. --Dave Barry I drink to make other people interesting. --George Jean Nathan They who drink beer will think beer. --Washington Irving An intelligent man is sometimes forced to be drunk to spend time with his fools. --For Whom the Bell Tolls, Ernest Hemmingway You're not drunk if you can lie on the floor without holding on. --Dean Martin All right, brain, I don't like you and you don't like me so let's just do this and I'll get back to killing you with beer. --Homer Simpson Time is never wasted when you're wasted all the time. --Catherine Zandonella A woman drove me to drink and I didn't even have the decency to thank her. --W.C. Fields ---------------------------------------------------------------------------------- According to the Knight-Ridder News Service, the inscription on the metal bands used by the U.S. Department of the Interior to tag migratory birds has been changed. The bands used to bear the address of the Washington Biological Survey, abbreviated: Wash. Biol. Surv. ... until the agency received the following letter from an Arkansas camper: "Dear Sirs: While camping last week I shot one of your birds. I think it was a crow. I followed the cooking instructions on the leg tag and I want to tell you, it was horrible." The bands are now marked Fish and Wildlife Service. ---------------------------------------------------------------------------------- A lady from California purchased a piece of timber land in Oregon. There was a large tree on one of the highest points in the tract. She wanted to get a good view of her land so she started to climb the big tree. As she neared the top,she encountered a spotted owl that attacked her. In her haste to escape, the lady slid down the tree to the ground and got many splinters in her private parts. In considerable pain, she hurried to the nearest doctor. He listened to her story then told her to go into the examining room and he would see if he could help her.She sat and waited for three hours before the doctor reappeared. The angry lady demanded " What took you so long?" and he replied "Well, I had to get permits from the Environmental Protection Agency, the Forest Service, and the Bureau of Land Management before I could remove old-growth timber from a recreational area." ---------------------------------------------------------------------------------- 10 TOP REASONS WHY GOD CREATED EVE 10. God worried that Adam would always be lost in the garden because men hate to ask for directions. 9. God knew that Adam would one day need someone to hand him the TV remote. (Men don't want to see what's ON television, they want to see WHAT ELSE is on!) 8. God knew that Adam would never buy a new fig leaf when his seat wore out and would therefore need Eve to get one for him. 7. God knew that Adam would never make a doctor's appointment for himself. 6. God knew that Adam would never remember which night was garbage night. 5. God knew that if the world was to be populated, men would never be able to handle childbearing. 4. As "Keeper of the Garden," Adam would never remember where he put his tools. 3. The scripture account of creation indicates Adam needed someone to blame his troubles on when God caught him hiding in the garden. 2. As the Bible says, "It is not good for man to be alone!" 1. When God finished the creation of Adam, He stepped back, scratched His head and said, "I can do better than that." ---------------------------------------------------------------------------------- Two men waiting at the Pearly Gates strike up a conversation. "How'd you die?" the first man asks the second. "I froze to death," says the second. "That's awful," says the first man. "How does it feel to freeze to death?" "It's very uncomfortable at first", says the second man. "You get the shakes, and you get pains in all your fingers and toes. But eventually, it's a very calm way to go. You get numb and you kind of drift off, as if you're sleeping. How about you, how did you die?" "I had a heart attack," says the first man. "You see, I knew my wife was cheating on me, so one day I showed up at home unexpectedly. I ran up to the bedroom, and found her alone, knitting. I ran down to the basement, but no one was hiding there, either. I ran up to the second floor, but no one was hiding there either. I ran as fast as I could to the attic, and just as I got there, I had a massive heart attack and died." The second man shakes his head. "That's so ironic," he says. "What do you mean?" asks the first man. "If you had only stopped to look in the freezer, we'd both still be alive." ---------------------------------------------------------------------------------- The Pope, Billy Graham, and Oral Roberts were in a three-way plane crash over the Atlantic Ocean. Tragically, they all died and went to the pearly gates together. "Oh, this is terrible," exclaims St. Peter, "I know you guys think we summoned you here, but this is just one of those coincidences that happen. St. Peter was fretting, "Since we weren't expecting you, your quarters just aren't ready. We can't take you in just yet and we can't send you back." Then he got an idea. He picked up the phone, "Lucifer, this is Pete. Hey, I got these three guys up here. They're ours, but we weren't expecting them, and we gotta fix the place up for 'em. I was hoping you could put them up for a while. It'll only be a couple of days. I'll owe you one." Reluctantly, the Devil agreed. BUT..... Two days later... "Pete, this is Lucifer. Hey you gotta come get these three clowns. This Pope fellow is forgiving everybody, the Graham guy is saving everybody, and that Oral Roberts has raised enough money to buy air conditioning." *********************************************** (The preceding was a product of the"Military Collector Group Post", an international email magazine dedicated to the preservation of history and the equipment that made it. Unlimited circulation of this material is authorized so long as the proper credits to the original authors, and publisher or this group are included. For more information conserning this group contact Dennis Starks at, military-radio-guy@juno.com) ***********************************************