Bob,
Probably none of those things I suggested had anything to do with it but I
sure have seen some weird SWR readings based upon those types of things.
Most likely, with the reading .5 and .7 apart, it is just the discrepancy,
that is, the inaccuracy of the meter. My TW1 and 2 give slightly different
readings one minute to the next, too. Sometimes a coax connector can be the
cause, loose verses super tight. Your pet dog could be outside taking a
leak and peeing on your coax, thus raising the temperature, and changing the
SWR. Sort of kidding there but you never know. I read an article once
where two guys, line of sight, on 1296 megs were about two blocks from each
other and working side band, I think they said, and one night when they
scheduled together, one of the guy's signals was down 20 to 30 DB. They
tried all sorts of things trying to figure out why the signal drop. Power
and SWR was fine and antennas hadn't changed. Then one guy remember he had
been working on his roof. Oh, I forgot, the antennas were in their attics.
He had pounded some new nails into the shingles and one of the nails was
blocking the beamed signal for light of sight. He pulled the nail, and the
signal on 1296 bounced right back up.
Phil.
K0NX
----- Original Message -----
From: "Bob Martin" <[log in to unmask]>
To: "Phil Scovell" <[log in to unmask]>
Sent: Wednesday, May 27, 2009 5:58 PM
Subject: Re: SWR Readings With LDG TW-2 on 430 - 450 Band
> Thanks, Phil:
>
> Perhaps all you noted. I took readings less than a half minute apart.
>
> 7e
> Bob
> KC3FI
>
> EchoLink Node - 55127
> Please visit http://www.wan-leatonks.net.
> ----- Original Message -----
> From: "Phil Scovell" <[log in to unmask]>
> To: "Bob Martin" <[log in to unmask]>
> Sent: Wednesday, May 27, 2009 6:44 PM
> Subject: Re: SWR Readings With LDG TW-2 on 430 - 450 Band
>
>
>> Ambient air surrounding the antenna, static build up due to wind speed
>> and humidity content of the air passing over the elements, current level
>> of humidity, temperature changes, possible power lines in one given
>> direction verses another even if they are many yards away, trees even if
>> many yard distance, moisture build up inside the antenna tubing, to name
>> a few.
>>
>> Phil.
>> K0NX
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Bob Martin" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Wednesday, May 27, 2009 4:24 PM
>> Subject: SWR Readings With LDG TW-2 on 430 - 450 Band
>>
>>
>>> Quite often, I don't get exactly the same SWR reading when taken back to
>>> back transmitting FM on the 430 to 450 band. If the antenna was close
>>> to an
>>> object, I would figure antenna movement caused by wind. The antenna is
>>> in
>>> the clear by 50 feet. Five measurements one after the other show
>>> variation
>>> of 2 units, 1.5 and 1.7 etc. At other times I do get 5 of the exact
>>> same
>>> readings. Any thoughts?
>>>
>>> Bob Martin
>>> KC3FI
>>>
>>> EchoLink Node - 55127
>>> Please visit http://www.wan-leatonks.net.
>>>
>>
>
>
>
|
