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#1
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RHF wrote:
Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. So I got a license to transmit. Some call that "elitist", I call it self-indulgent. |
#2
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In article ,
Dave wrote: RHF wrote: Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. So I got a license to transmit. Some call that "elitist", I call it self-indulgent. Remote tuners are the right way to do things. Much better than a tuner in the shack. -- Telamon Ventura, California |
#3
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Telamon wrote:
In article , Dave wrote: RHF wrote: Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. So I got a license to transmit. Some call that "elitist", I call it self-indulgent. Remote tuners are the right way to do things. Much better than a tuner in the shack. A tuner in the shack matches the radio to the transmission line. There is still a mismatch at the feedpoint. |
#4
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In article ,
Dave wrote: Telamon wrote: In article , Dave wrote: RHF wrote: Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. So I got a license to transmit. Some call that "elitist", I call it self-indulgent. I would just call it following your interests. Remote tuners are the right way to do things. Much better than a tuner in the shack. A tuner in the shack matches the radio to the transmission line. There is still a mismatch at the feedpoint. Exactly. Then the transmit energy ends up heating the coax to the antenna and components in the tuner. sarcasm on As a bonus you get RFI in the shack. Another bonus is high voltage at points in the coax to the antenna where you could have a flashover condition. Sarcasm off A tuner at the antenna is a much better setup. You are doing things right. Most HAM's don't. When Mr. Smith imagines doing this he does it wrong. -- Telamon Ventura, California |
#5
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Telamon wrote:
In article , Dave wrote: Telamon wrote: In article , Dave wrote: RHF wrote: Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. So I got a license to transmit. Some call that "elitist", I call it self-indulgent. I would just call it following your interests. Remote tuners are the right way to do things. Much better than a tuner in the shack. A tuner in the shack matches the radio to the transmission line. There is still a mismatch at the feedpoint. Exactly. Then the transmit energy ends up heating the coax to the antenna and components in the tuner. sarcasm on As a bonus you get RFI in the shack. Another bonus is high voltage at points in the coax to the antenna where you could have a flashover condition. Sarcasm off A tuner at the antenna is a much better setup. You are doing things right. Most HAM's don't. When Mr. Smith imagines doing this he does it wrong. He's right, too. My sloper is resonant but I still use a tuner to protect the transceiver. I was going to use the Remote Autotuner but don't need it. I get a decent match even on 160. |
#6
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Dave wrote:
... A tuner at the antenna is a much better setup. You are doing things right. Most HAM's don't. When Mr. Smith imagines doing this he does it wrong. He's right, too. My sloper is resonant but I still use a tuner to protect the transceiver. I was going to use the Remote Autotuner but don't need it. I get a decent match even on 160. Actually, Telemundo is just the same old idiot, pulling the same old tricks and attempting to appear as a guru to those possessing even less knowledge than himself ... I never even commented on where the placement of the matchbox would be, and, as everyone knows, anywhere along the line you can place it. The best place would be between the coax (feedline) and the antenna--that is, taking for granted that the match from your rig to the feedline is perfect. However, no matter where you place the matchbox (including up telemundos butt), its' losses remain constant, and, it is a net loss to the system .... and the poor antenna remains just as poor--its' faults having been masked. Next end-run please? Regards, JS |
#7
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On Dec 28, 6:24*pm, Dave wrote:
Telamon wrote: In article , *Dave wrote: Telamon wrote: In article , *Dave wrote: RHF wrote: Dave, IIRC a good Amateur Radio 1/4 WL Vertical-Up-Leg by 1/4 WL Horizontal-Out-Arm {Inverted "L" Antenna requires very little Tuning and performs very well near and far on the HF Band that it is 'cut' to use on. Using a direct-connect or 1:1 UnUn at the Feed-Point * Half-Wave Inverted "L" Antenna : 1/4 WL + 1/4 WL Where-as the more common Shortwave Listener (SWL) type of {Random Wire} Inverted "L" Antenna is un-equal and usually has a shorter Vertical-Up-Leg and a longer Horizontal-Out-Arm of at least 1V-to-2H and often 1V-to-3H or more. *Using a 9:1 Matching Transformer and Ground Rod at the Feed-Point which is at the base of the Vertical-Up-Leg. "Random" implies otherwise. *Instead of a 9:1 UnUn, imagine one of these at the feed point: http://www.mfjenterprises.com/Produc...ductid=MFJ-927 I enjoy playing with these kind of things. *So I got a license to transmit. *Some call that "elitist", I call it self-indulgent. I would just call it following your interests. Remote tuners are the right way to do things. Much better than a tuner in the shack. A tuner in the shack matches the radio to the transmission line. *There is still a mismatch at the feedpoint. Exactly. Then the transmit energy ends up heating the coax to the antenna and components in the tuner. sarcasm on As a bonus you get RFI in the shack. Another bonus is high voltage at points in the coax to the antenna where you could have a flashover condition. Sarcasm off A tuner at the antenna is a much better setup. You are doing things right. Most HAM's don't. When Mr. Smith imagines doing this he does it wrong. - He's right, too. *My sloper is resonant but - I still use a tuner to protect the transceiver. -*I was going to use the Remote Autotuner but - don't need it. *I get a decent match even on 160. -IF- Your main objective is to protect the Transceiver -then- a Tuner in the Radio-Shack will do that. -however- If your main objective is to 'optimize' your Transmitting Signal : Then a Tuner at the Antenna's Feed-Point will do that better. ~ RHF |
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