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dwmitchell61

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  • Location
    Vancouver, WA
  • Interests
    Motorcycling, photography, kayaking, radio

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  1. I am curious as to how the heliax obviates any common mode current on the outer skin of the shield. Maybe I am misunderstanding the cause of common mode current on the feedlines? I thought it was due to imbalance in the antenna system. The PPT presentation you linked to above, on Page 6, states" "– Coax is not a part of these imbalances" So, I am wondering how your expensive heliax transmission line solves the issue. I have a lot to learn and don't know it all and am open to some mentoring from an "Elmer" It would seem that using ferrite beads of a proper mix rather than the old, trusty "ugly balun" method would be more effective at higher frequencies like GMRS. Thank you and 73 Dave, KJ7WUZ/WRHW845
  2. Ed Fong, PhD is an electronics engineer that is reputable and knows what he is doing. He developed these antennas from a request that he design an antenna given explicit criteria for a corporation in the communications business. There is no need to criticize unless you are willing to back your critique with explicit engineering facts. You don't have to buy Doctor Fong's products, but the proceeds do go to supporting the college students in his college courses. As for the big brand name antennas, I would suggest you take the time to look inside the next one you buy before you put it on your tower or mast. You might just be shocked by what you find, and maybe even a bit disappointed if you know anything about soldering and antenna theory. I intend to purchase his antennas for my use when I go portable. I just don't want to have to carry around some 10 foot to 17 foot fiberglassed fragile antenna that could be broken, then spend another $200-300 replacing it. Stay well, see you on the air, stay well and try to stay positive 73 Dave, KJ7WUZ/WRHW845
  3. I don't have an appropriate soldering station for the shielding. I tried to build a coaxial collinear antenna with a 25W iron on RG-8X and it was a mess. Even tried a butane soldering iron. If it's just the center pin, then that is manageable.
  4. This sounds like it may get expensive... Windstorm brought down mast & destroyed my base antenna. So's I buys a new antenna. The XYL says radios have to leave the bedroom, son has moved out, I now have a radio shack (and XYL used to manage Radio Shack here, LoL). Make a long story short. New mast, new antenna, new location, in the air, all guyed up, cables awaiting window feedthrough... I look over and find my Welsh terrier hanging from the GMRS coax and she's having a great time. I look and there are holes all the through the external insulation. Now I get reports I am "loud and clear but scratchy". Looks like I am going to lose some length in the cable... About how much is a crimper set for doing N-type connectors on LM-400? Maybe someone at the club will graciously let me borrow theirs?
  5. The words he speaks are true... I have a repeater 8 miles out on my HT ham radio. I can reach it using 1W loud and clear. My "base station" putting out 40W cannot reach a repeater 26 miles out, due to a mountain between us. I can, however, reach another about the same distance because there are no hills between us.
  6. On channel 1 I am receiving a constant beep. I thought I heard some family chat in the distant background. One of the neighborhood kids must have set his radio down with an emergency beacon or something turned on. No channel 1 until the battery runs down, I guess.
  7. Thanks folks. I found it before I found your messages. Sure appreciate your help, none the less.
  8. Oregon CIty 575 and Oregon City 575-2 repeaters are not showing in my searches. Repeater owner is WRAS495. I can however, searh by his call sign and pull them up. But the lack of visibility in the "NEAR ME" and "ADVANCED SEARCHES" is probably limiting the usage on his repeaters. Thank you, Dave, WHRW845
  9. Is there a way, to age repeater records so entries for repeaters that never made it online or have been taken down are removed from the database. There are like 4 or 5 repeaters listed in my area that have never responded to a transmission in the two years I have been here...., show no activity of the owner and which the owner does not respond when correspondence is sent to them about the repeater.
  10. If you are lucky, it is in the DC power to the radio, from the car. Get a big CAPACITOR from electronics supply house or auto stereo shop and connect it across the wires
  11. I did the antenna upgrade to my Wouxon KG-805..... A Nagoya antenna. Works alot better than antenna included in the purchase of the radio. Reaching people 4-5 miles out while in my easy chair. They used to say, "As much wire in the air, as high as possible." I have adapters for the SMA to a SO-238 so I can connect it to the Comet CA-712EFC base antenna.
  12. I guess you won't mind if I sit in the chair next to you at the doctors office and pass some gas, then? LMAO..... Sorry, poor analogy but it seemed funny at the moment...
  13. It's okay. From what I understand, rants are very much in vogue right now! LMAO...
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