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#1
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= = = "Jack Painter" wrote in message
= = = news:owNpd.4394$SA.57@lakeread02... "RHF" wrote You may wish to consider moving the Feed-Point from the Center of Two Equal Arms to an Off-Center Feed-Point with a Short-Arm of 38% and a Long-Arm of 62% of the Total Length of the Antenna. This type 'configuration' of Wire Antenna is called a "WINDOM" Antenna. RHF: Windom style antennas are transmitting gimmicks that use the vertical component of the antenna as an added radiator for wider band coverage than a dipole (without a tuner that is) would otherwise have. No windom antenna has any added receive benefits whatsoever. I would say it has no place in SWL at all for that matter, there being many easier to install and general coverage receive antennas available. best regards, Jack JP, ABOUT - Shortwave Listeners (SWLers) and Shortwave Listening (SWLing) 'part' of the SWLers' FUN is: - Simply Listening to "What Is Out There" ![]() - Buying; Seting-Up, Using and Modifying the SWL Equipment ![]() - Buying, Building (Thinking About & Planning SWL Antenna ![]() and for some Posting here on Rec.Radio.Shortwave etc ![]() IMHO: If a SWL can Buy/Build some form of Windom Antenna and ENJOY using it to Listen to Shortwave - Then the Windom Antenna has a 'place' in Shortwave Listening. * KISAP Broadband Shortwave Listeners' (SWL) Windom Antenna http://groups.yahoo.com/group/Shortw...a/message/1511 Shortwave Listener "SWL" {300 Ohm Twin Lead} Windom Antenna - Long-Arm 'cut' for the 49 Meter Shortwave Band = 38.54 Feet - Short-Arm 'cut' for the 31 Meter Shortwave Band = 24.13 Feet - Vertical-Leg 'cut' for the 19 Meter Shortwave Band = 15.15 Feet - Mount/Rig this Antenna at a Height of 30.3 Feet with the Vertical Leg and Coax Cable Feed-in-Line coming down Straight and Vertical. - TV 300 Ohm to 75 Ohm Matching Transformer (Balun) - TV 75 Ohm Coax Cable Feed-in-Line NOTE: The 300 Ohm Twin Lead froms a 'continious loop of wire' in the shape (outline) of a small 't'. The Ends of the Loop are connected to the 300 Ohm Ends of the Matching Transformer. iane ~ RHF .. .. |
#2
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![]() "RHF" wrote in message m... = = = "Lucky" wrote in message = = = ... I'm using 300Ohm Twinlead as an ant hooked up to a 4:1 current balun. But, the lead is NOT split and divided like a dipole but can't just as it is together. Is it still functioning exactly as a bad dipole? I'm getting great reception, low noise. I just don't want to limit myself with a dipole. Lucky LUCKY, Hey - What Works - WORKS ! ![]() What you appear to have is a Center-Fed ZEPP Antenna or "T" Antenna. Using a Balun (Matching Transformer) and Coax Cable Feed-in-Line makes it an 'improved' Low Noise Antenna. You may wish to consider moving the Feed-Point from the Center of Two Equal Arms to an Off-Center Feed-Point with a Short-Arm of 38% and a Long-Arm of 62% of the Total Length of the Antenna. This type 'configuration' of Wire Antenna is called a "WINDOM" Antenna. Three to Read: * Need an Off-Center Fed SWL Antenna consider a Windom type design http://groups.yahoo.com/group/Shortw...a/message/1582 - The ORIGINAL Windom Antenna - The Improved "Low Noise" Windom Antenna - The "Dipole" Windom Antenna - The "G5RV" Windom Antenna * KISAP Broadband Antenna Questions http://groups.yahoo.com/group/Shortw...a/message/1511 Shortwave Listener "SWL" {300 Ohm Twin Lead} Windom Antenna - Long-Arm 'cut' for the 49 Meter Shortwave Band = 38.54 Feet - Short-Arm 'cut' for the 31 Meter Shortwave Band = 24.13 Feet - Vertical-Leg 'cut' for the 19 Meter Shortwave Band = 15.15 Feet - Mount/Rig this Antenna at a Height of 30.3 Feet with the Vertical Leg and Coax Cable Feed-in-Line coming down Straight and Vertical. - TV 300 Ohm to 75 Ohm Matching Transformer (Balun) - TV 75 Ohm Coax Cable Feed-in-Line NOTE: The 300 Ohm Twin Lead froms a 'continious loop of wire' in the shape (outline) of a small 't'. The Ends of the Loop are connected to the 300 Ohm Ends of the Matching Transformer. * A Few "Ready-Made" Windom Antennas http://groups.yahoo.com/group/Shortw...a/message/1583 iane ~ RHF . . Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/Shortw...na/message/502 I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond - The BEYOND ! . . On thing I should make clear is that this twinlead is NOT center fed at all. I'm using the lead just like a long wire except the ends of the twinL are separate and not connected and it's hooked up to a balun in the room, not outside. Only coax from balun to beautiful radio. Lucky |
#3
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Lucky wrote:
On thing I should make clear is that this twinlead is NOT center fed at all. I'm using the lead just like a long wire except the ends of the twinL are separate and not connected and it's hooked up to a balun in the room, not outside. Only coax from balun to beautiful radio. Lucky What you have is a twinlead feed line to nowhere. You need some kind of wiring on the far end of the twinlead to have a real antenna. If you connected a wire to each of the wires in the end of the twinlead and extended those wires in opposite directions, you would have a traditional dipole. However 300-ohm twinlead should be connected to a folded dipole antenna for a proper impedance match. A simple two wire dipole {not folded} matches to 50-ohm coax lead better than a 300-ohm twinlead. In that case you don't need the twinlead at all. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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