On 11/02/2017 11:25 PM, Wes Stewart wrote:
Well, yes, the transmitter is looking into the transmission line and
then the antenna load, so they are different. To be fair you need to
place the analyzer at the input (TX) end of the line. Now the TX and
the analyzer see the same thing. But this
Well, yes, the transmitter is looking into the transmission line and then the
antenna load, so they are different. To be fair you need to place the analyzer
at the input (TX) end of the line. Now the TX and the analyzer see the same
thing. But this isn't a good way to match the antenna to the
m: Topband [mailto:topband-boun...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Wednesday, November 01, 2017 12:12 PM
To: Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Hi Wes
Thanks for the reply I can move the point of lowest SWR by moving the tap on
Sent: Friday, November 03, 2017 1:46 AM
To: Russ Tobolic
Cc: 'Wes Attaway (N5WA)' ; JC ; 'topband List' ; 'Ronald Gorski'
Subject: Re: Topband: 160m Vertical matching Help
I Don't think we even have any AM stations in the country never mind close
enough to bother
Cc: 'topband List'
Sent: Thu, 02 Nov 2017 13:19:21 -0000 (GMT)
Subject: Re: Topband: 160m Vertical matching Help
JC's caution is important. Check to see if you have any MF broadcast stations
near you. I have the MFJ259 and a 5KW AM station at 1480 Kc about 1.5 miles
away
;
; 'Wes Attaway (N5WA)'
Cc: 'topband List'
Sent: Wednesday, November 1, 2017 5:30 PM
Subject: Re: Topband: 160m Vertical matching Help
Hi guys
Before anything else, don't trust MFJ269 reading, transmit with 10 w and
measure the SWR. It is very common the energ
Rick,
what are the ball park figured on the coil diameter I'm guessing 5 or
so inches across is a good place to start
Paul. N0AH
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On November 1, 2017 11:25:42 AM "Richard (Rick) Karlquist"
wrote:
> You need +j34 ohms in parallel wi
Ideally I don't want to drop the loading wires as they are not easy to get
> to but I can if I need to,
>
> Thanks
> Trevor
>
>
>
> - Original Message -
> From: "Richard (Rick) Karlquist"
> To: "MR TREVOR DUNNE" , "topband List"
pband-boun...@contesting.com] On Behalf Of Ronald
Gorski
Sent: Wednesday, November 01, 2017 2:38 PM
To: MR TREVOR DUNNE ; Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Trevol, the portion of the coil between the tap and the base of the vertical
determines resonance
Hi Trevor
Read Joe, W4TV's answer again !
The coil should be whatever inductance you need to resonate your slightly
short antenna . . . then you can use that coil as an auto-transformer to get
a good match, ie once the antenna is resonant, you can feed your coax a few
turns up the coil.
But you
...@contesting.com] On Behalf Of MR TREVOR
DUNNE
Sent: Wednesday, November 01, 2017 12:12 PM
To: Wes Attaway (N5WA)
Cc: topband List
Subject: Re: Topband: 160m Vertical matching Help
Hi Wes
Thanks for the reply I can move the point of lowest SWR by moving the tap on
the coil, I need to lower the
rlquist"
To: "MR TREVOR DUNNE" , "topband List"
Sent: Wednesday, 1 November, 2017 17:25:25
Subject: Re: Topband: 160m Vertical matching Help
You need +j34 ohms in parallel with your coax coming in.
This is about 3 microhenries. This would be around 6
turns on your coil if the
Start by disconnecting the feedline. Connect a jumper to the junction
of the vertical wire and the coil. Now use a grid dip meter and tap
down the coil until the antenna is resonant (dip occurs) at the desired
frequency. Now connect the feed line (shield to ground) and tap up the
coil until yo
Trevor,
You haven't really provided enough information to solve your problem. If you
want to use a shunt coil then I suggest that you consider measuring the R-jX at
your frequency of interest and then designing an L-network using purposeful
shortening of the antenna to create a capacitive rea
You need +j34 ohms in parallel with your coax coming in.
This is about 3 microhenries. This would be around 6
turns on your coil if the turns are spaced a wire
diameter. IOW, tap the coax 6 turns from the grounded end.
Then tap the antenna to whatever tunes to 1.83 MHz.
Rick N6RK
On 11/1/2017
;
To: "MR TREVOR DUNNE" , "topband List"
Sent: Wednesday, 1 November, 2017 17:02:55
Subject: RE: Topband: 160m Vertical matching Help
Without doing any modeling, an off the top of the head idea, one option
would be to drop a wire down from the end of each of the T wires you
160m Vertical matching Help
Hi All
I finally got the vertical up and running, problem I have now is I can't
find a low SWR on the coil, the best I can get is about 2.8:1 no matter
where I tap the coil that's the best SWR, I can move that point up and down
the band by moving the tap but th
Hi All
I finally got the vertical up and running, problem I have now is I can't find a
low SWR on the coil, the best I can get is about 2.8:1 no matter where I tap
the coil that's the best SWR, I can move that point up and down the band by
moving the tap but the SWR stays the same,
My curre
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