[Elecraft] Strange Vertical - need help

[Rich - K1HTV]

Gerald,
   The specs for the GP10-40 call for use of the transceiver's ATU (Antenna
Tuning Unit). If you have an ATU in your K3 you should have no problem with it
providing a proper match to the transmitter with the SWR measurements that you
mention in your note. They quote using a 100 foot long run which you have. They
also imply in the specs that if a shorter line (75 ft) is used,  a wider range
tuner would be needed. 

Do you have an ATU in your K3? If so, make sure that it is not in BYPASS mode
(Hold the ATU button to change it) then tap the ATU TUNE button and it should
easily make the K3 happy with the load that it sees.

If you don't have the internal K3 ATU, then you will either need to install one
or use an external antenna tuner to provide the proper match for the K3. 

73,
Rich - K1HTV

= = = 

-----Original Message-----
From: KC6CNN [mailto:kc6cnn at gmail.com] 
Sent: Sunday, March 11, 2012 11:48 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Strange Vertical - need help

I installed a vertical with ground radial kit up 20 feet.
The antenna mast and negative sheild connector is grounded to a ground rod.
The antenna covers 10 to 40 meters.
I can tune 10 meters fine, and fourty meters fine, but 12,15,17,20,and 30 will
not tune and SWR are high.
here are the SWR reading taken on AM running 25 watts. 

10 meter

2804550 is 2 to 1 SWR

2882000 is 1.5  to 1 SWR


12 meter

2490000 is 3 to 1 SWR

24990 is 3 to 1 SWR


15 meter

2103900 is 4 to 1 SWR

top porting is 3 to 1 SWR


17 meter

1809000 is 3 to 1 SWR

1817000 is 2 to 1 SWR


20 meter  

1402800 is 2 to 1 SWR

1430000 is 2 to 1 SWR


30 meter 

1010500 is 4 to 1 SWR

1014000 is 4 to 1 SWR


40 meter

7026 is 2 to 1 SWR

7290 is 1.5 to 1 SWR

Any help or suggestions would be greatly appreciated. I will be receiving my
K3 on Tuesday and am trying to get this antenna sorted out before then. 
Oh yea the rig I'm using right now is a Kenwood 570, the Coax is LMR400 with a
100' run. the Antenna is a ZeroFive GP10-40.

Thank you
Gerald Manthey
KC6CNN


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