| Home |
| Search |
| Today's Posts |
|
|
|
#1
May 29th 05, 04:35 AM
|
|||
|
|||
Impedance of pull-up whip on SW Receiver?
I have a Grundig YB-500 (Yacht Boy 500) shortwave portable. I frequently take it to remote locations with me and have enjoyed the radio for years. It has a short pull up whip antenna, all I have done in the past is to slingshot a long wire into a tree and use a clip lead to attach it to the pull-up whip (no external ant connections on the radio).
I was wondering what the impedance the collapsed whip would present, and what sort or a balun/auto-transformer could be used between a longwire (or other ant), gnd and the pull-up whip to improve reception... .... anyone ever done any experimenting or unique ideas? Warmest regards, John C. Smith -- Watching the cutting edge of yesterday replay--in virtual reality, right before my eyes--in real time! Thirty year old technology--wasn't it amazing? |
|
#2
May 29th 05, 04:52 AM
|
|||
|
|||
|
On Sat, 28 May 2005 20:35:59 -0700, "John Smith"
wrote: This is a multi-part message in MIME format. Boring. I was wondering what the impedance the collapsed whip would present, and = Hi Brett, Depends on the frequency. EZNEC would answer that in a heartbeat. Given your preference for backing into problem, at 10MHz, at 1M in length, 1 - J 1Kohms. what sort or a balun/auto-transformer could be used between a longwire = (or other ant), gnd and the pull-up whip to improve reception... Aw c'mon now, Google will give you this in another heartbeat. ... anyone ever done any experimenting or unique ideas? Pons and Fleishman comes to mind - with many imitators.... 73's Richard Clark, KB7QHC |
|
#3
May 29th 05, 05:11 AM
|
|||
|
|||
|
Hmmm, I have googled Richard... but not found anything other than standard baluns/auto-transformers and all too boring methods of using them... and yes, I could go expermenting on my own with these--was mainly hoping someone has walked this path before and already gleaned the best method, or at least could get me ranting, raving and thinking!!! grin My bark is MUCH worse than my bite yanno....
I didn't mean what the capacitve reactance of the pull-up whip was--itself, I meant to mean the input impedance which the input at the bottom of that whip expected to see... It seems obivious they have provided some +J Ohms just past the bottom of that whip (or maybe not?)... however, input be high impedance and 1K+ ohms--and some non-reactive load could be assumed to be expected by it? Warmest regards, John "Richard Clark" wrote in message ... On Sat, 28 May 2005 20:35:59 -0700, "John Smith" wrote: This is a multi-part message in MIME format. Boring. I was wondering what the impedance the collapsed whip would present, and = Hi Brett, Depends on the frequency. EZNEC would answer that in a heartbeat. Given your preference for backing into problem, at 10MHz, at 1M in length, 1 - J 1Kohms. what sort or a balun/auto-transformer could be used between a longwire = (or other ant), gnd and the pull-up whip to improve reception... Aw c'mon now, Google will give you this in another heartbeat. ... anyone ever done any experimenting or unique ideas? Pons and Fleishman comes to mind - with many imitators.... 73's Richard Clark, KB7QHC |
|
#4
May 29th 05, 05:16 AM
|
|||
|
|||
|
Well, leave it to me--said that all wrong and only caught it on the re-read--which--naturally--I did AFTER posting...
I should have made it apparent that whatever ant I hook to it, will, of course--have to mimic that capacitive reactance you mentioned... Warmest regards, John "John Smith" wrote in message ... Hmmm, I have googled Richard... but not found anything other than standard baluns/auto-transformers and all too boring methods of using them... and yes, I could go expermenting on my own with these--was mainly hoping someone has walked this path before and already gleaned the best method, or at least could get me ranting, raving and thinking!!! grin My bark is MUCH worse than my bite yanno.... I didn't mean what the capacitve reactance of the pull-up whip was--itself, I meant to mean the input impedance which the input at the bottom of that whip expected to see... It seems obivious they have provided some +J Ohms just past the bottom of that whip (or maybe not?)... however, input be high impedance and 1K+ ohms--and some non-reactive load could be assumed to be expected by it? Warmest regards, John "Richard Clark" wrote in message ... On Sat, 28 May 2005 20:35:59 -0700, "John Smith" wrote: This is a multi-part message in MIME format. Boring. I was wondering what the impedance the collapsed whip would present, and = Hi Brett, Depends on the frequency. EZNEC would answer that in a heartbeat. Given your preference for backing into problem, at 10MHz, at 1M in length, 1 - J 1Kohms. what sort or a balun/auto-transformer could be used between a longwire = (or other ant), gnd and the pull-up whip to improve reception... Aw c'mon now, Google will give you this in another heartbeat. ... anyone ever done any experimenting or unique ideas? Pons and Fleishman comes to mind - with many imitators.... 73's Richard Clark, KB7QHC |
|
#5
May 29th 05, 07:42 AM
|
|||
|
|||
|
On Sat, 28 May 2005 21:16:48 -0700, "John Smith"
wrote: Well, leave it to me--said that all wrong and only caught it on the re-read--which--naturally--I did AFTER posting... I should have made it apparent that whatever ant I hook to it, will, of course--have to mimic that capacitive reactance you mentioned... Warmest regards, John "John Smith" wrote in message ... Hmmm, I have googled Richard... but not found anything other than standard baluns/auto-transformers and all too boring methods of using them... and yes, I could go expermenting on my own with these--was mainly hoping someone has walked this path before and already gleaned the best method, or at least could get me ranting, raving and thinking!!! grin My bark is MUCH worse than my bite yanno.... I didn't mean what the capacitve reactance of the pull-up whip was--itself, I meant to mean the input impedance which the input at the bottom of that whip expected to see... It seems obivious they have provided some +J Ohms just past the bottom of that whip (or maybe not?)... however, input be high impedance and 1K+ ohms--and some non-reactive load could be assumed to be expected by it? Warmest regards, John "Richard Clark" wrote in message ... On Sat, 28 May 2005 20:35:59 -0700, "John Smith" wrote: This is a multi-part message in MIME format. Boring. I was wondering what the impedance the collapsed whip would present, and = Hi Brett, Depends on the frequency. EZNEC would answer that in a heartbeat. Given your preference for backing into problem, at 10MHz, at 1M in length, 1 - J 1Kohms. what sort or a balun/auto-transformer could be used between a longwire = (or other ant), gnd and the pull-up whip to improve reception... Aw c'mon now, Google will give you this in another heartbeat. ... anyone ever done any experimenting or unique ideas? Pons and Fleishman comes to mind - with many imitators.... 73's Richard Clark, KB7QHC |
|
#6
May 29th 05, 07:53 AM
|
|||
|
|||
|
On Sat, 28 May 2005 21:16:48 -0700, "John Smith"
wrote: This is a multi-part message in MIME format. This is still boring. Well, leave it to me--said that all wrong and only caught it on the = re-read--which--naturally--I did AFTER posting... I should have made it apparent that whatever ant I hook to it, will, of = course--have to mimic that capacitive reactance you mentioned... And you had to post a 170 line message to pass on 4 lines of information? This goes from boring to lazy. The capacitive reactance comes free with the whip. You will drum up a 100 responses on what's better - what is odder is that all those great ideas haven't become ordinary after 50 years or more. And after, what, 17 - 18 years? no one's figured out how to power NYC with a Zippo's full of cold fusion either. Strange thing about invention - doesn't seem to work all the time (or worse, anytime). 73's Richard Clark, KB7QHC |
|
#7
May 29th 05, 04:51 PM
|
|||
|
|||
|
That is why I top post, so I can ignore the house cleaning...
Now, if there were a setting somewhere in this cheap M$ product which said something like, "Include no more that ??? lines of previous posts in reply..."--I'd use it! grin Yes Richard, I still have not given up--perhaps there are people comming up with fresh ideas--even when I can't... Warmest regards John "Richard Clark" wrote in message ... On Sat, 28 May 2005 21:16:48 -0700, "John Smith" wrote: This is a multi-part message in MIME format. This is still boring. Well, leave it to me--said that all wrong and only caught it on the = re-read--which--naturally--I did AFTER posting... I should have made it apparent that whatever ant I hook to it, will, of = course--have to mimic that capacitive reactance you mentioned... And you had to post a 170 line message to pass on 4 lines of information? This goes from boring to lazy. The capacitive reactance comes free with the whip. You will drum up a 100 responses on what's better - what is odder is that all those great ideas haven't become ordinary after 50 years or more. And after, what, 17 - 18 years? no one's figured out how to power NYC with a Zippo's full of cold fusion either. Strange thing about invention - doesn't seem to work all the time (or worse, anytime). 73's Richard Clark, KB7QHC |
|
#8
May 29th 05, 03:34 PM
|
|||
|
|||
|
On Sat, 28 May 2005 21:16:48 -0700, "John Smith"
wrote: This is a multi-part message in MIME format. Boring. Whatever Brett did to his posting apparatus, the text now falls off the right edge of the screen (in an Agent reader), requiring back and forth scrolling to read anything. bob k5qwg |
|
#9
May 29th 05, 05:16 PM
|
|||
|
|||
|
Bob:
I have put on an ancient compiler here... borland turbo pascal... don't know if it related--all started then (and a LOT of other weird stuff to--running windows xp with sp2 and all patches up to date), bear with me while I seek a solution--please... it is microsoft junk yanno... frown Warmest regards, John "Bob Miller" wrote in message ... On Sat, 28 May 2005 21:16:48 -0700, "John Smith" wrote: This is a multi-part message in MIME format. Boring. Whatever Brett did to his posting apparatus, the text now falls off the right edge of the screen (in an Agent reader), requiring back and forth scrolling to read anything. bob k5qwg |
|
#10
May 29th 05, 11:33 PM
|
|||
|
|||
|
You guys are a crack-up, you have others which read this newsgroup, calling me Brett in other newsgroups... I give up, I have began answering to it... grin
I expect anyway now for the FBI to show up at my door with a complete list of aliases I have used in the past and begin an interrogation of me--with lights in my face and rubber hoses--in the back room... grin .... asking me if I know where Osama is... he's my dad yanno... roflol Warmest regards, John "Bob Miller" wrote in message ... On Sat, 28 May 2005 21:16:48 -0700, "John Smith" wrote: This is a multi-part message in MIME format. Boring. Whatever Brett did to his posting apparatus, the text now falls off the right edge of the screen (in an Agent reader), requiring back and forth scrolling to read anything. bob k5qwg |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Choke Balun Impedance Recommendations? | Antenna | |||
| FS:Conar Twins - Conar 500 Receiver & Conar 400 Xmtr | Equipment | |||
| Review: Ramsey HFRC-1 WWV receiver kit | Equipment | |||
| Review: Ramsey HFRC-1 WWV receiver kit | Equipment | |||
| FS: Icom R75 Receiver w/DSP | Shortwave | |||
Hybrid Mode
