Greetings Ed!   
      
    RW>> Well, there are 3 schematics for that radio on that site. I'd   
    RW>> like to have a copy of them, but the radio has a schematic   
    RW>> attached to the inside of the back cover and it's readable,   
    RW>> with a magnifying glass.   
      
    EV> I haven't been back to that site, but anything I see that I want to   
    EV> keep a copy of I use DoPDF to 'print' a .PDF of it.   
      
   The problem with that is that you have to become a member before you can   
   get a large enough view of the entire schematic. They display them in   
   partial views only and those aren't big enough to read.   
      
    EV> If they show a schematic try DoPDF or even use the Print Scr key and   
    EV> use some program like Irfanview to Paste the Clipboard into, and then   
    EV> just remove the extra stuff to save the schematic as a .JPG .   
    EV> HTH   
    EV> -snip-   
      
    EV>> I don't think I even had heard of a Log Periodic Antenna in the   
    EV>> early to mid 1960's.   
      
    RW>> Ummmm. They were on every rooftop of houses with a TV set. Most   
    RW>> of them were dual banders, aka VHF and UHF...when I worked for   
    RW>> Solar Turbines in San Diego c1967, a younger friend and I built   
    RW>> a few for our own use. He was a tool & die apprentice, I was   
    RW>> t&d journeyman at the time and he lived two blocks down the   
    RW>> street from me.   
      
    EV> I only remember seeing Yagi TV antennas on houses, mostly VHF only,   
      
   1940s & 50s...   
      
    EV> though sometime later I seen a UHF over a VHF antenna.   
      
   When UHF began, you saw UHF antennas on the same mast as a VHF Yagi.   
      
   Later, they made VHF/UHF antennas all in one.   
      
   The LPAs came along in the late 60s.   
      
    EV>> And it would be a bear to make and position by the TV Set.   
      
    RW>> There's a video on YouTube showing how to make one out of   
    RW>> stripped RG59 coax (using the shield only) as the electrical   
    RW>> 'boom' and #12 house wire as the radials. It is only 58cm   
    RW>> (22.6") long. The support boom is made out of wood, 1" square,   
    RW>> and all radials are wood screwed to the coax boom at a   
    RW>> specified spacing.  Crude, but affective. The video shows the   
    RW>> builder holding the antenna pointing it out of the window,   
    RW>> waving it about, the TV HD signal fades and brightens as he   
    RW>> finds the station's xmitter site.   
      
    EV> Thanks!, but that rig would be cumbersome to use IN a bedroom.   
      
   It's less than 20" long and you could always have it floating near the   
   ceiling, once you found the direction of the station you want.   
      
    EV> My Twin-Lead Folded Dipole was replaced by a Circular Wire antenna   
    EV> after other UHF TV Stations came on the air.   
      
   What were the dimensions of the CW antenna?   
      
    EV> The antenna I made just drooped behind the TV Set, the newer one   
    EV> could be turned to adjust for the best picture, and was nicer looking   
    EV> to the older folks. -snip-   
      
   Like rabbit ears...   
      
    EV>> Tonight I looked at a ruler and that seems about the length that I   
    EV>> recall the antenna being.   
      
   q   
      
    EV>> My 19 CM guess earlier was way off the mark, wasn't it? .... ..   
      
    RW>> Yes, it should have been about 19 1/4 inches.   
      
    EV> Half of that for the 'half-wave' folded dipole I made.   
      
   Closer to 10" ...   
      
    EV>> I do the best I can with what I got, but when I really want to know   
    EV>> something I go to the Books I have to get it down to the nitty   
    EV>> gritty.   
      
    RW>> I keep a formula in my head that allows me to figure a 1/4 wave   
    RW>> antenna. Multiplying that by 4 and you get the full wave   
    RW>> length.   
      
    EV> See above.   
      
    RW>> 2808/freq in MHz * 4 = a full wavelength.   
      
    RW>> 2808/582 = 4.825 x 4 = 19.24"   
      
    RW>> Somebody asked me some years ago in the HAM echo where I got   
    RW>> that 2808 number. Which had something to do with figuring the   
    RW>> length of a dipole and a number around 5600. It's been so long   
    RW>> since I figured that, I have forgotten what it was.  Anyway,   
    RW>> building 1/4 wave GPs that 2808 number worked out very well, as   
    RW>> each one of those antennas made for 450 MHz, had less than   
    RW>> 1.2:1 VSWR across the entire 10MHz of that band. As would be   
    RW>> expected, the 145Mhz and 220Mhz antennas worked just as well.   
      
    EV> The only Antenna Formula I think I can remember was either 468 or 486   
    EV> over the Wavelength (or Frequency) = Frequency (or Wavelength).   
    EV> Haven't made any antennas for years and I'd have to go look at the   
    EV> book first before I'd cut any 14 AWG Copper Wire.   
      
   That probably equates to feet and inches. The one I always remember is   
   300/Frequency in MHz = wavelength. But that gives you a metric answer.   
      
   Yeup, 300/28 = 10.7mtrs...468/28 = 16.7 feet.   
      
    EV> (Later) I just wasted a lot of time looking around on Wikipedia for   
    EV> the correct number, I looked at Antenna, 486, 468 and did some other   
    EV> searches there and gave up.   
      
   I recall the dimensions easier than that number. If I plug 486 into the   
   formula, 486/28 = 17.35 feet. Getting closer...   
      
    EV> None of the books I have in the room where this computer is were able   
    EV> to help me either.   
      
   The ARRL Antenna Handbook (CR-1974) says it best: 'A length/diameter ratio   
   of 10,000 is roughly average for wire antennas.' Known as a factor K in   
   figuring the length of a wire antenna. Length in inches = 5905 x   
   K/frequency in MHz...and they show a chart of the difference along a wire   
   in space and the real thing.   
      
    EV> I 'thought' the "The Great International Math On Keys Book" that was   
    EV> included with the Texas Instruments TI-30 Calculator I got in the   
    EV> 1970's would have it for me, or another Scientific Calculator I have   
    EV> that had a book with it, but NO, nothing I looked at showed me what I   
    EV> was trying to find.   
      
   If you take the above and you want to make a 1/2 wave dipole, you use half   
   of the number 5905. Each leg will be a 1/2 wave. i.e. 2952.5/28Mhz = 105.4   
   inches, which is nearer to the length of whips sold for 10mtrs...your car   
   or vehicle is the other half of the dipole.   
      
    EV> So I went and got a Handbook to see the number is 468, but my idea of   
    EV> the Formula it was used in was all wrong.   
      
    EV> Length of Half-Wave Antenna (feet) = 468 Divided By Frequency in   
    EV> Megacycles.   
      
   = Feet...   
      
    EV> DUH!!!!!!   
    EV> -snip-   
      
    EV>> I ran a wire around my radio room up near the ceiling, One Big Loop.   
    EV>> I used  it with the DX-40 on 20 Meters.   
      
    RW>> Not for transmitting I hope.   
      
    EV> SURE!, what else do you use a Heath DX-40 for?   
    EV> -snip-   
      
   So, you lived a dangerous life in a RF environmet, aka a Faraday box...   
      
    RW>> Not only that, but the radio was xtal controlled xmit only. It   
    RW>> had a tunable receiver. That was nice for listening to off   
    RW>> frequency radios. My Golden Eagle had that too, but it could   
    RW>> switch to a set of 23ch mixer controlled receiver too.   
      
    EV> My DX-40 was Crystal Controlled (Only) until I got my General Ticket   
    EV> and used a Knight-Kit VFO with it.   
      
   Yes, as I recall, those days a Novice was required to use xtal controlled   
   frequency radios.   
      
    EV> CB Radios HAD to be Crystal Controlled until (I think) until the   
    EV> Phase Lock Loop circuit was used in them.   
      
   Phase locked loop and later the digital frequency oscillator...   
      
    EV> I don't know nuttin about PLL, but I'd think they have One or Two   
    EV> Crystals in the circuit???   
      
   Yeup. Even then, all a CBer had to do was change one of the mixer xtals   
   with another and come up with 4 unauthorized channels. Or do as I did to   
   get a clean operation from my car to the house, swap xtals around so that   
   you listened on one channel, but xmitted on another. My CB base station   
   was always heard loud and clear where I worked in downtown San Diego and   
   the morning rush hour was plagued with too many conversations to make   
   conversing with my wife in Clairmont difficult at times.   
      
    EV> There's lots of other things I never figured out how they work, such   
    EV> as J-K Flip Flops........ SO I guess I'll never become Mr.   
    EV> Know-it-ALL.    .... ..   
      
   I experimented with that stuff many years ago, but lost interest.   
      
    EV> A Friend who went to Navy Electronic Technicians School, told me his   
    EV> instructor said not to try to remember all the formulas, just KNOW   
    EV> where the book is that has them in it.   
      
   Now that's the best advice one can get. My other favorite was to reply to   
   the 'I want to learn' this or that questions was: go read the book.   
      
       Have a day!   
      
            R\%/itt - K5RXT   
      
      
   --- GoldED+/W32 1.1.5-31012   
   --- D'Bridge 3.99   
    * Origin: HAM Radio, aka Amateur Radio. 804? Over! (1:387/22)