[Elecraft] RF feedback?

[James Sarte]

This is definitely a compromise system, there's no arguing that point but
it's all I can work with at this point in time.  I live on the 14th floor of
a NYC apartment building and management will not permit antennas on the
roof.  The only place I can put an antenna up is on the balcony.  The linear
doesn't get used often; only when necessary to make or complete a contact.

Interestingly enough though, this problem is the only RF related issue I'm
having.  I haven't noticed any other problems with my electronics apart from
this.  No TVI, no telephone interference, no computer problems or network
issues...

By the way, don't know if you read my previous email but this problem stops
if I turn the peak mode off on the watt meter.  The alarm still works and
the amp bypass functions if I pass the predefined threshold in average mode,
but the moment I go back to peak mode this issue returns.  

James K2QI

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brown
Sent: Tuesday, July 14, 2009 9:13 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] RF feedback?

You're running 1.1kW to a screwdriver with essentially no radial system and 
you're surprised that you have RF issues?  THAT'S your problem!  Build 
yourself a real antenna. This antennna is a disaster -- it's using every
wire 
in your house and shack as a counterpoise. No wonder you have RF issues! 
Chances are that you're also lighting up every other piece of electronics in

the building. 

Screwdriver antennas are designed to work against the body of a vehicle (and

a pretty beefy vehicle at that) as a counterpoise. They are EXTREMELY 
compromised antennas. The "choke" you describe is next to useless. 

If your can find structural steel on your balcony, you should use that as
the 
counterpoise for this antenna. The building will still be pretty hot with
RF, 
but it should work a lot better than what you have now. 

>Please clarify the K3 pin 1 issue; 

Study the reference I posted.

73,

Jim K9YC


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