Colin:
Ok, let me clarify, based on what I now know.
As I think back on things now, I did test the G5RV independent of all coax
connections on Saturday, and got the short across the PL259, which is what
prompted this whole discussion to begin with.
This is why I'm now coming to the conclusion that maybe the entire problem
was caused by things up on the roof of the RV, with metal roofing, railings,
and such.
Now that the G5RV is independent of everything, I no longer get the short.
This week-end, I will check all feed line connections again first, and then
try to put up the antenna.
I will also do the checks of the antenna that Howard suggested in an earlier
post.
I'm sorry if I confused issues, but I think things are really clarifying
themselves now.
Time will tell if I'm right or wrong, and I will share what I find with
everyone.
One thing I can say for sure is that I am learning a great deal about the
G5RV, feed line systems, what to assume and what not to assume, etc..
73 from Tom Behler: KB8TYJ
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, August 20, 2012 11:52 PM
Subject: Re: G5RV Update
> ok, this is excellent news.
> However, I must have misread or misunderstood your original post. I
> thought
> you said you had disconnected the G5RV from all other RV feed lines and
> you
> were still seeing the short... I also thought you had said you checked
> the
> RV feed lines independant of the g5RV...if they are connected together,
> they
> are not independant and a short in one is going to show in the other...
> So if I reed this correctly now, you had the G5RV pig tail connected to
> the
> RV feed point, and you were testing the antenna from inside the rv with
> the
> connecter at your operating position correct? and that is where you were
> seeing the short?
> You had us all thinking you had disconnected the g5RV completely and were
> still seeing the short on the connecter of the pigtail on the end of the
> 450
> ohm latter line.
> I echo the sentiment that if you have issues with your feedline that goes
> from the operating position to outside where you connect the antenna to,
> then it would explain allot about your frustration with the screw driver
> as
> well.
> Remember never to assume something is working as it should until you test
> each link in the chain...in this case, you failed to check the state of
> the
> feedline between the radio and the outside where the antenna was
> connected.
> And, you kept doing tests with that feed line connected, thus leaving it
> in
> the chain and causing the testing to be inaccurate.
> not a problem though, it's all part of figuring out what's going on.
> Did you happen to do a continuity check from the inside of the RV after
> the
> g5RV was disconnected at the outside connecter?
>
> 73
> Colin, V A6BKX
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, August 20, 2012 7:05 PM
> Subject: G5RV Update
>
>
>> Hi, all.
>>
>> Well, tonight, with a little bribery in the form of an ice cream cone on
>> the
>> way out to the RV, the XYL and I took the trip to retrieve the suspect
>> G5RV.
>>
>> The antenna is now right here in front of me, and guess what I found!
>>
>> With the antenna taken down, and now free of any connections, there is an
>> open circuit across the PL259! In other words, no continuity across the
>> connector!
>>
>> So, to me, this would indicate that the antenna is sound electrically.
>>
>> Before putting it up again, of course, I will check all connections, but
>> this, to me, is very encouraging.
>>
>> It also indicates to me that there is a problem somewhere in my feed line
>> system, hopefully not in the feed line that runs underneath the RV.
>>
>> At least, though, I think I've now got the problem isolated in a major
>> way.
>>
>> Will keep everyone posted, but, unless I'm deluding myself, I'm now
>> greatly
>> encouraged.
>>
>> 73 from Tom Behler: KB8TYJ
>
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