BLIND-HAMS Archives

For blind ham radio operators

BLIND-HAMS@LISTSERV.ICORS.ORG

Options: Use Forum View

Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
John Miller <[log in to unmask]>
Reply To:
For blind ham radio operators <[log in to unmask]>
Date:
Thu, 20 Dec 2007 16:56:21 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (116 lines)
Believe it or not, when mine was broke, my performance wasn't down all that 
much until I hit 40 meters and 75, and then it got dirty, started with major 
RFI and stuff where it didn't used to, but really, the SWR didn't change a 
lot to that point except 40 and 75 a little and what happened was the feed 
line was mostly separated from the antenna, where the twin lead connects at 
the center insulator. I mean barely hanging on in that, when we started to 
lower the antenna, that came suddenly with out the antenna. It must have 
just barely been hanging on. It probably would have been visible if anyone 
had looked at that point.
----- Original Message ----- 
From: "T Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 20, 2007 4:48 PM
Subject: Re: g5rv question


>    Well, thanks, John.
>
> As I said, I'll have the XYL do a quick visual on it sometime within the
> next few days, weather and daylight permitting.
>
> My thought was also that maybe something was broken, but it does seem to 
> do
> well yet on 20 meters.
>
> It's rather strange, though, and sure took me by surprise today.
>
> At least I'm glad I checked.
>
> 73 from Tom behler:  KB8TYJ
>
> ----- Original Message ----- 
> From: "John Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, December 20, 2007 4:21 PM
> Subject: Re: g5rv question
>
>
>> I'd wonder if something is broke possibly, mine isn't horizontal 100%, 
>> but
>> mine was very close for a long time and even now, it's a lot more
>> horizontal
>> than it is vertical and it works great. I can't say what my SWR was 
>> before
>> it broke last spring, but now, with about 3 inches off the ladder line, 
>> my
>> worst SWR is on 10 meters at about 5:1, maybe a little less. I'd say my
>> twin
>> lead has a very gradual slope to it. Nowhere near even 45 degrees. I 
>> guess
>> it being 100% horizontal might change some characteristic of the antenna,
>> and you could try maybe putting it back like it was maybe and see if that
>> improves it, but I'd tend to think it's something else personally.
>> ----- Original Message ----- 
>> From: "T Behler" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Thursday, December 20, 2007 4:11 PM
>> Subject: g5rv question
>>
>>
>>> Hi, all.
>>>
>>> Well, I hope I'm among friends here, because I have what probably is a
>>> very
>>> elementary question about a G5RV HF antenna.
>>>
>>> I currently have a 102-foot G5RV antenna here at the home qth.  The
>>> center
>>> of the antenna is at the top of a 35-foot tower which contains my KLM
>>> tri-bander and a 6-meter vertical that is mounted on a "stand off" from
>>> the
>>> tower.
>>>
>>> I originally had the antenna so that the ladder-line vertically came 
>>> down
>>> the tower from the centerpoint, and then was connected to a coax 
>>> feedline
>>> that went into the shack.
>>>
>>> Earlier this Fall, someone suggested that my ladder line shouldn't be so
>>> close to the tower and vertical like that, and suggested that it be much
>>> further away from the tower.  So, he took the ladder line and basically
>>> made
>>> it run horizontally from the tower over to an anchor point on the house.
>>>
>>> Being that I was so busy with professional stuff this Fall semester, I
>>> never
>>> really tried the antenna, but now I'm noticing that, even though it 
>>> seems
>>> to
>>> do well on 20 meters (SWR no more than 2.0 to 1 across the entire band),
>>> it
>>> won't tune at all on 40 or 80 meters.  The sWR's are either at least 8 
>>> to
>>> 1,
>>> or so high that my Remy Simared talking SWR meter won't even give a
>>> reading.
>>>
>>> I'll have my XYL do a visual on the antenna as soon as possible, but,
>>> barring any obvious mechanical problem with the antenna, could someone
>>> suggest what the problem might be?
>>>
>>> Is the horizontal configuration of the ladder line what likely is
>>> throwing
>>> things off so much here?
>>>
>>> I know this is probably a very elementary question, but it concerns me
>>> since
>>> my G5RV was always one of my best HF antennas, especially for 40 meters.
>>>
>>> 73 from Tom Behler:  KB8TYJ
>>>
>>
>>
> 

ATOM RSS1 RSS2