Re: LF: More on unstable antenna R

[N1BUG <paul@n1bug.com>]

Hi Claudio,

You give some very interesting ideas !!

I will try to make some of the measurements you suggest. It should
be interesting to check RF current in different places.

Thank you !

73,
Paul


On 12/5/18 4:18 AM, Claudio Pozzi wrote:
> On Monday, December 03, 2018 10:56:59 AM you wrote:
> 
> SNIP
>  
>> Of course I do need to measure *antenna* current to be sure it is
>> increasing as I expect. 
> 
> My few cents...
> 
> 1- check if the antenna coil and transmitter ground share the same 
> earth/ground connection.
> 
> 2- build the simplest RF current meter 
> (http://mirror.thelifeofkenneth.com/lib/electronics_archive/RSGB Low 
> Frequency Experimenter's Handbook.pdf[1]   page 81)
> 
> 3- on the coil side measure the current at the top (antenna wire) and the 
> bottom (ground wire). If they differ some RF current flow in the screen of 
> COAX cable and in the Tx grounding: measure the RF current at the Tx 
> grounding.
> 
> 4- Record what current increase when the Tx is turned on and check that 
> circuit.
> 
> Remember that this procedure doesn't need a calibrated meter, but a 
> STABLE meter.
> 
> 73 de Claudio IK2PII