Topband: BCI

[Tim Duffy K3LR]

Hello Scott:

Lots of things can cause your receiver to hear the third harmonic of an AM
broadcast station. One of many reasons - could be the broadcast station -
but is the most unlikely source of this issue. 

You commented you moved your Beverage antenna, you also added a protector
and now you are hearing the 3rd harmonic of WTVN. Do you also hear it on
your TX antenna? Do other nearby hams hear it as well?

Many front end protectors use back to back diodes to limit the RF level
delivered to the recover. These back to back diode protectors are notorious
for being saturated and could be the cause of your harmonic problem in the
160 meter band.

Try a test listening without your protector and see what happens.

73,
Tim K3LR 

-----Original Message-----
From: topband-bounces at contesting.com [mailto:topband-bounces at contesting.com]
On Behalf Of Scott Long
Sent: Tuesday, December 13, 2011 4:36 PM
To: topband at contesting.com
Subject: Topband: BCI

A strange happening already this season,  I am hearing WTVN-AM 610 khz
(Columbus OH) plain as day on 1830 khz.  This is the only frequency that I
hear it on.  I am at least 35 miles from this station, and it is west of me.
The antenna is a 350 ft long East-West bi-directional beverage.  I just
moved this antenna away from transmit antenna to the south and added a
frontend protector on my FT-920.  That's the only thing that has been
changed to this antenna.  I don't hear either of our local stations WHTH-AM
790 khz or WCLT-AM 1430 khz.  WCLT is less than one air mile from me.  What
do guys use to smash the BCI?

 

Thanks for reading.

 

Scott, K8SM

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UR RST IS ... ... ..9 QSB QSB - hw? BK