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#1
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Balun description: who is right
I built an "ugly" air wound balun on a PVC water pipe according to this
description http://www.hamuniverse.com/balun.html I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured outside. But recently i had the chance to look up the section in the ARRL antenna book and there the number of windings is considerably smaller at a higher winding radius. Which description is right? Or does either have advantages and drawbacks? |
#2
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Johann Höchtl wrote:
I built an "ugly" air wound balun on a PVC water pipe according to this description http://www.hamuniverse.com/balun.html I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured outside. But recently i had the chance to look up the section in the ARRL antenna book and there the number of windings is considerably smaller at a higher winding radius. Which description is right? Or does either have advantages and drawbacks? The optimum number of turns depends upon the band. Such a balun optimized for 160m may not be effective on 10m and vice versa. OTOH, ferrite baluns can be designed to function over a 10:1 frequency range by the proper choice of the material for the toroid. -- 73, Cecil http://www.qsl.net/w5dxp ----== 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 =--- |
#3
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From MY copy of the message I sent containing the binary attachment I get no response by clicking the program's icon or the 'paper clip'. I get a message which says "Outlook Express has made the attachment inaccessible". So its in my computer somewhere but I can't get at it. Not that I want it. At some time in the distant past I may have set OE to reject suspicious non-standard attachments. But out of curiosity, has anyone managed to download program SELFRES2 ? Or has it been rejected simply because its a binary file sent via a newsgroup? Thank you for your cooperation. Although the program is finished I am reluctant to make it generally available via my website because it has not been tested against actual coils for spurious responses in impedance resonant curves which might restrict the operating bandwidth at the higher frequencies. It's unexpected defects in the coils I am interested in rather than defects in the program. ---- Reg. |
#4
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Reg,
I downloaded and launched the program without difficulty. It is generally considered "unsafe" to pass around naked 'exe' files in newsgroups. It is quite typical that newsreaders have a default to disallow such files. I have also seen downloads of 'exe' files that came through corrupted for some reason. I do not know why. In any case the difficulty with bare 'exe' files is one reason that many files are zipped up. 73, Gene W4SZ (This group is set up as a non-binary group. However, there is no mechanism that prevent binary attachments, so that would not be the cause of the problem you report.) Reg Edwards wrote: From MY copy of the message I sent containing the binary attachment I get no response by clicking the program's icon or the 'paper clip'. I get a message which says "Outlook Express has made the attachment inaccessible". So its in my computer somewhere but I can't get at it. Not that I want it. At some time in the distant past I may have set OE to reject suspicious non-standard attachments. But out of curiosity, has anyone managed to download program SELFRES2 ? Or has it been rejected simply because its a binary file sent via a newsgroup? Thank you for your cooperation. Although the program is finished I am reluctant to make it generally available via my website because it has not been tested against actual coils for spurious responses in impedance resonant curves which might restrict the operating bandwidth at the higher frequencies. It's unexpected defects in the coils I am interested in rather than defects in the program. ---- Reg. |
#5
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"Reg Edwards" wrote in message ... From MY copy of the message I sent containing the binary attachment I get no response by clicking the program's icon or the 'paper clip'. I get a message which says "Outlook Express has made the attachment inaccessible". So its in my computer somewhere but I can't get at it. Not that I want it. At some time in the distant past I may have set OE to reject suspicious non-standard attachments. But out of curiosity, has anyone managed to download program SELFRES2 ? Or has it been rejected simply because its a binary file sent via a newsgroup? Thank you for your cooperation. Hi, Reg - I am using XP. The attachment is grayed out in OE for me and is not available. I have heard that M$ did that intentionally to minimize the transmission of virii. If you simply rename the file extension to something else, like SelfRes2.run perhaps, the file might then become available and could be executed after renaming. Or you could just zip it up and it will transfer okay. I think. That's what I've heard, anyway. John |
#6
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"Reg Edwards" wrote in message ... From MY copy of the message I sent containing the binary attachment I get no response by clicking the program's icon or the 'paper clip'. I get a message which says "Outlook Express has made the attachment inaccessible". So its in my computer somewhere but I can't get at it. Not that I want it. At some time in the distant past I may have set OE to reject suspicious non-standard attachments. But out of curiosity, has anyone managed to download program SELFRES2 ? Or has it been rejected simply because its a binary file sent via a newsgroup? Thank you for your cooperation. Update... In XP, I clicked Tools/Options then selected the Security tab. Unchecked the "Do not allow attachments to be saved or opened...". I can get the file now. I runs just fine. John |
#7
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non-standard attachments. But out of curiosity, has anyone managed to download program SELFRES2 ? Or has it been rejected simply because its a binary file sent via a newsgroup? Thank you for your cooperation. Running win 98 here. The file is grayed out but this hapens alot to me. I tell OUtlook Express ro forward the message and from there I can run and or save the program just fine. Thanks for the many fine programs. |
#8
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Hello Johann:
Loose the coax Balun, and get a toroid balun. All the coax Baluns I have used are now used to tie up bushs for pick up on Thrusdays morning trash pick up. http://www.amidoncorp.com/aai_cost_baluns.htm After replacing the coax balun, with the Amodon 1 to 1 HBH50 current type balun, on my yagi beams it was like night and day. Ten-4. Jay in the Mojave Johann Höchtl wrote: I built an "ugly" air wound balun on a PVC water pipe according to this description http://www.hamuniverse.com/balun.html I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured outside. But recently i had the chance to look up the section in the ARRL antenna book and there the number of windings is considerably smaller at a higher winding radius. Which description is right? Or does either have advantages and drawbacks? |
#9
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On Wed, 03 Nov 2004 01:17:33 GMT, "John Smith"
wrote: In XP, I clicked Tools/Options then selected the Security tab. Unchecked the "Do not allow attachments to be saved or opened..." Hi John, You are now standing at the edge of the abyss. 73's Richard Clark, KB7QHC |
#10
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Jay in the Mojave wrote:
Hello Johann: Loose the coax Balun, and get a toroid balun. After replacing the coax balun, with the Amodon 1 to 1 HBH50 current type balun, on my yagi beams it was like night and day. Ten-4. Jay in the Mojave Did you throw it because of signal loss or because the coax balun did not worked as expected, so what a balun (balanced -- unbalanced) is meant to be? It's not all about that i really need a balun when running a dipole antenna and rg58 but i fear RIF with neighbors .... |
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