[Elecraft] K2 Transmit Test

[Don Wilhelm]

  Tony and all,

Those "counterpoise" wires should not just be dangled on the ground.  
They will carry RF current, and the RF voltage at the ends can be quite 
high.  Treat them just like an antenna radiating element - keep them 
clear of possible contact for humans and pets, and use insulators on the 
ends just as you would on an antenna radiator.

Be safe for yourself and your family and guests.

73,
Don W3FPR

On 5/4/2011 8:09 PM, Tony Estep wrote:
> Paul, you can use an 80 meter dipole on 40 as you describe. Many have done
> it with success. However, you may have to fool with it to get it to work,
> since the antenna is being fed at a very high impedance point.
>
> I assume the balun you're talking about is 4:1. To start, I'd suggest
> grounding the cold side of the balun to a counterpoise consisting of at
> least 3 wires 33 feet long strung out in various directions, out the window
> and lying on the ground if possible. Another helpful measure is to insert an
> RF isolator (like those available from Radioworks.com). It goes between the
> balun and the tuner. This is just a 1:1 choke balun which kills off any RF
> current flowing on the outside of your coax.
>
> I'd bet that these two modifications will bring things under control. If
> not, you may have to try different lengths of feedline, but save that for a
> last resort.
>
> good luck,
> Tony KT0NY
>
>
> On Wed, May 4, 2011 at 6:49 PM, Paul Agoglia<pagoglia at stny.rr.com>  wrote:
>
>> I ran a transmit test today ....
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>