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#31
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![]() "m II" wrote in message news:MAI0d.96262$S55.21286@clgrps12... Honus wrote: "m II" wrote in message news:m9y0d.92232$S55.2174@clgrps12... I don't claim any paranormal powers, other than a modest, self effacing, Ghandiesque and virtually unnerring insight into the human condition Ever try aiming that into a mirror? g I'm not familiar with those, although I believe I once saw a glint of perfection reflected from a very shiny coaxial cable connector..a sense of wonder and tranquility permeated my very core. If you saw a reflection in a curved surface that appeared to be perfect, I hate to think what you really look like. But then, talk about getting your money's worth in a carnival's Fun House, what with all of those weird mirrors and all! |
#32
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#33
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Hi Steve,
I have a 450 ft. Beverage antenna at 270 degrees (West) and a 700 ft. Beverage antenna oriented at 320 degrees (Northwest). They are relay-switched with a single run of double-shielded Belden coax, and matched with a homebrew impedance matcher. The coax shield is grounded in the middle of the run with a Bentonite-enhanced ground system. The antennas are about 8 feet high on average, running through a very dense greenbelt behind my home. The AC power mains are all underground for more than a half mile radius around the neighborhood. The downside of these quiet and directional antennas is all the Seattle/Tacoma area mediumwave stations nearby! LOTS of RF in the air, many MW signals running S9+50db to S9+65db. A Kiwa BCB filter + extension filter is very helpful when DXing on shortwave, as the filters reduce RF blocking effects. Unfortunately the antennas are pointing more or less in the direction of my locals as I'm to the SE of Seattle and West of Tacoma. For trans-Pacific MW DXing from home, nothing helps them get past the strong domestic stations except good propagation, perseverance and luck! The splatter and RF blocking/desensing can be really tough in the vicinity of the strongest locals (ie, +/- 40 or 50 kHz). Guy Atkins Puyallup, WA USA mod. Racal RA6790GM / mod. ICOM R-75 Kiwa MAP / ERGO / Timewave DSP-59+ "Steve" wrote in message om... I'm always curious about people's antennas, though they often go unmentioned here. So, what's in your back yard (or on your roof, or in your attic....)? Steve |
#34
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I'm always curious about people's antennas, though they often go
unmentioned here. So, what's in your back yard (or on your roof, or in your attic....)? I have really enjoyed this dicussion. I don't have a high end radio. The best I have is a Rat Shack 390. Currently I am using a 40' 14ga long wire connected to the radio with just regular "hook up wire." I tend to have problems with overload from big signal stations with this radio. I would love to get a better quality radio, but that is not in the cards right now. I have about 1000' feet of 14ga wire here available and could run 100" plus runs and almost any direction. What could I do to cut back on the strong signal overload with my current radio? I have RG-8, and RG-174 coax available. Would a balun help? Thanks for the post and any replies! |
#36
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I've been listening to shortwave radio since the mid-1970s, and so
I've done a fair amount of tinkering with antennas. Like everyone else, I've been on that quest for the best all-around antenna that really doesn't exist. Right now I use a 42-ft, longwire, attic antenna that's feed with 450-Ohm feedline that terminates in a tuner (T-network) in a closet near the receiver. I use 50-Ohm coax between the tuner and receiver, which is also my amateur transceiver. I "tune" the antenna using an MFJ-259 analyzer. Why did I settle for this system: - It fits in my attic. - It's radiation patterns are dipole-like on the bands I listen to (and operate on as an amateur). - I don't fear lightning strikes. - It isn't in the weather, so it isn't a maintenance problem. - I don't run high power as an amateur, and operate mostly CW, so efficiency isn't a big issue for me. - It's stealthy. -Dave, K3WQ |
#37
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#38
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![]() "Jon Lippert" wrote in message ... I don't have a high end radio. The best I have is a Rat Shack 390. Don't get down too much about not having a high-end radio. A high-end radio won't invent signals, merely resolve them somewhat better and make them listenable and identifiable. There's still lots you can listen to with your radio. Mark. |
#39
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"DesignGuy" wrote in message news:2ND0d.173828$mD.134815@attbi_s02...
"Steve" wrote in message om... I'm always curious about people's antennas, though they often go unmentioned here. So, what's in your back yard (or on your roof, or in your attic....)? 55 ft. random wire coax-fed via balun Eavesdropper dipole Hi, I'm very curious about the Eavesdropper-T and Eavesdropper-C dipoles (see Universal-Radio online catalog) for my attic. The Eavesdropper-T is a trapped dipole center-fed with 100' of 72 ohm balanced feedline. The Eavesdropper-C is identical except it includes a coax fitting and does not include a lead-in cable. Both models are 43' long (ideal for my attic space) and include static arrestors. For the first thirty feet of my attic, there is electrical wiring to the lights running 3'-4' from the peak of the roof, and for the last ten feet within a foot of the peak. My questions are will this antenna mounted at the very peak of the attic: 1. Be safe from lightning strikes? 2. Increase the chances of frying my radios even if electrocution is not an issue? 3. Suffer interference from the electrical wiring described above whether the lights are on or off? 4. Or interference from the utility lines outside the house which run both parallel and perpendicular to the proposed antenna 15' to the side and 10' below? 5. Need to be grounded? (I believe I have read somewhere that a balanced dipole does not need to be grounded in order to deliver an acceptable low-noise signal. Is this wrong?) What I have in mind, especially if I don't need to ground the antenna, is moving my shack up to the attic and listening to DX on long winter nights with a jug of corn liquor to keep me warm. Any advice would be greatly appreciated. Regards, Grumpus Slinky dipole (currently unused) Radio Shack discone antenna (for scanner) All in attic of my house |
#40
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Telamon wrote in message ...
In article , (David Drumheller) wrote: I've been listening to shortwave radio since the mid-1970s, and so I've done a fair amount of tinkering with antennas. Like everyone else, I've been on that quest for the best all-around antenna that really doesn't exist. Right now I use a 42-ft, longwire, attic antenna that's feed with 450-Ohm feedline that terminates in a tuner (T-network) in a closet near the receiver. I use 50-Ohm coax between the tuner and receiver, which is also my amateur transceiver. I "tune" the antenna using an MFJ-259 analyzer. Why did I settle for this system: - It fits in my attic. - It's radiation patterns are dipole-like on the bands I listen to (and operate on as an amateur). - I don't fear lightning strikes. - It isn't in the weather, so it isn't a maintenance problem. - I don't run high power as an amateur, and operate mostly CW, so efficiency isn't a big issue for me. - It's stealthy. Giving up is pointless. Hmmm. I'm not sure what this remark is supposed to mean. But I suppose my original my original post was a little defeatist. What I should have also said is: - My attic antenna works quite well, as I have had no problems working anyone as an amateur. - I still fool around with outdoor antennas. These are mostly single-band systems, leaving my attic antenna to play the role of "Old Standby." I'm very happy with this arrangement. -Dave, K3WQ |
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