[Lowfer] New idea for Lowfer transmitting

[lowfer@mailman.qth.net]

Depends on what your intent is. If we want to make sure we arent
exceeding the ( put figure hear )
power as set by the FCC then some of us are going to need to be able to
measure ERP. In reality
me thinks the power level radiated by the antenna is generally going to
be within speck. That is with the given input restrictions set forth on
input power. But on the odd occasion when the wind is just right and the
balloons make a quarter wavelength , or the loop supporting soap bubble
expands nicely

Who Knows

Bob K3DJC



On Fri, 09 May 2003 00:05:54 -0400 "Bill Ashlock" <ashlockw@hotmail.com>
writes:
> Bob,
> 
> >there is a good near field device that can be calibrated to 
> determine
> >ERP in the RSGB's LF handbook. Consists of a direct conversion 
> rcvr
> >that is calibrated to a DMM with a Helmholtz coil. The article is a 
> good
> >read
> 
> Yes, I've read this article in detail. One of the problems with this 
> 
> approach is the DC receiver. This unit uses a low beat frequency to 
> get 
> around some of the problems but this makes for a poor audible copy - 
> and the 
> audio is important when measuring weak lowfer signals at up to and 
> sometimes 
> exceeding 100 miles. A good DC receiver is probably more complex 
> than my 
> superhet SVM.
>