On 01/18/2011 02:07 PM, bpnjensen wrote:
On Jan 18, 11:44 am, wrote:
On 01/18/2011 10:44 AM, bpnjensen wrote:





On Jan 18, 9:02 am, John wrote:
On 1/18/2011 6:56 AM, RHF wrote:

...
But it is 'by-design' a "Non-Resonate" Broadband
Shortwave Radio Listener's [SWL] Antenna using
a Broadbanded* 9:1 Matching Transformer. ~ RHF
* Frequency Range : 500kHz to 30 MHz
...

I don't know what antenna you are speaking of. But, the original bent
of this thread started out with "line isolators", actually traps meant
to resonate a single antenna on multiple bands ... usually a dipole,
however, can be used on monopoles also ...

Regards,
JS

Actually, no, and I am sorry if there was a misunderstanding - I meant
an inline (in the coax) RFI reduction system.

No such thing. Those isolators just keep hum away. Hum is not your
problem. You are likely hearing triac noise (dimmer buzz, halogen
torchieres, waterbed heaters, etc.) over the air. It is coming in or
power lines and RF chokes on those lines will stop it at the electrical
box. But because you have overhead mains that probably won't help
enough. You may be able to reduce it enough to get better results from
your phase canceller. I'm peabrainstorming here...- Hide quoted text -

- Show quoted text -

OK, good info. Do you think a magnetic loop could diminish reception
of the RFI from the overheads? Like, as Peter M. suggests, a
Wellbrook?

I have heard amazing things. That model is pricey. You can build an
experimental loop for the price of a variable capacitor from MFJ and
some scrap coax.