[NLRS] 2-meter TVI with a M2 Loop Antenna?

[jcplatt1 at mmm.com]

Hi Carl .... a few comments on your TVI issue.

First, I bet that your neighbors "rabbit ears" has an internal preamp.
These are very common from Radio Shack, etc.    They are also very very
susceptible to RF overload.     I could kill my neighbors new preamp with
just 2 watts ! .

Depending on the neighbors level of understanding and your relationship
with them, you may be able to solve this TVI issue by suggesting that he
tries a standard pair of rabbit ears, non-powered, non-amplified.

If he is unwilling to do this, a second approach MAY BE for you to purchase
a set of standard rabbit ears yourself, install a TVI filter as well, test
it out on your TV, then give it to the neighbor.    There are pros & cons
with respect to this second approach in that you are investing in his fix
..... some would say that that is a bad thing to be doing ...... I think
this depends a lot on you and your relationship with them.     I think its
important in your communications to never say that your at fault (which
your not), that the problem is be caused by a poor design of the rabbit ear
antenna, but that you would like to work with them to resolve their
problem.

Regarding RFI and susceptibility, its all about field strength.      For a
given power level and antenna I believe that field strength is roughly
proportional to one over the square of the distance.    That is why one of
the best ways to resolve RFI problems is to get as much distance between
the two antennas as possible.    A low omni could indeed create more
problems than a yagi mounted high in the air simply because its closer.
The other factor is antenna pattern.      A yagi has gain in the desired
direction, so it will decrease the field strength in other directions.   As
long as the yagi isn't pointed at the neighbors, it may help .... it may
not.

73, Jon
W0ZQ